Patent Description:
In the communication industry, 1U acts as one unit of work for a standard rack case whose height is about <NUM>. With the rapid development of communication technology, continuous miniaturization are required for the components inside a rack case to meet the installation size requirements of 1U unit of work, so as to increase the density of components in the rack case to save the overall volume of a communication device.

The existing common small circuit breakers have the heights usually ranging from <NUM> to <NUM>, as well as the space for the inlet and outlet end of wiring required to occupy a height of 3U, restricting the development of miniaturizing communication cabinets. In addition, the outlet end of the common small circuit breaker is positioned inside the rack case, not facilitating wiring for users. Furthermore, if an auxiliary signal function is added to the common small circuit breaker, the necessity to add auxiliary contact terminals or other similar functional accessories to the side of the circuit breaker increases the costs of use, occupies more installation space, not facilitating the development of miniaturizing communication cabinets.

The Chinese patent <CIT> discloses a miniature circuit breaker, wherein the short-circuit protecting mechanism <NUM> and the over-load protecting mechanism <NUM> are two independent structures to each other, the short-circuit protecting mechanism <NUM> is arranged shoulder by shoulder with the arc-distinguishing mechanism <NUM> and comprises a direct-acting magnetic release, the over-load protecting mechanism <NUM> is arranged shoulder by shoulder with the operating mechanism <NUM> and comprises a dual metal piece.

The present invention is defined in the appended set of claims, and aims to overcome the defects of the prior art and provides a plug-in circuit breaker with compact structure and small volume.

In order to achieve the above object, the present invention adopts the following technical solutions:.

Preferably, in the case that the plug-in circuit breaker is in the make-contact state, and the operating mechanism is in the locking state, while a short-circuit fault and an overload fault occurs, the protecting mechanism actuates the operating mechanism to trip off, then the plug-in circuit breaker trips and the operating mechanism enters an unlocking state, pulling the operating button to move it toward a break-contact position actuates the operating mechanism to return to the locking state, thus the plug-in circuit breaker enters a break-contact state; or in the case that the plug-in circuit breaker is in the make-contact state, while a short-circuit fault and an overload fault occurs, the protecting mechanism actuates the operating mechanism to act, so that the plug-in circuit breaker enters the break-contact state, after clearing the fault, pressing the operating button to move it toward the make-contact position actuates the operating mechanism to act, thus the plug-in circuit breaker enters the make-contact state.

Preferably, the operating mechanism further includes an U-shaped connecting rod, an operating handle, a contact supporting rod, a lock catch-resetting spring and a main tension spring;
the operating handle is pivotally arranged on the circuit breaker housing, one end of the operating handle is drivingly connected with the operating button by the U-shaped connecting rod, and the other end of the operating handle is rotatably connected with one end of the contact supporting rod, the other end of which is provided with the movable contact, the jump buckle has one end pivotally arranged on the circuit breaker housing, and the middle part connected with the end of the contact supporting rod provided with the movable contact by the main tension spring, the lock catch has the middle part rotatably arranged, one end connected with the lock catch-resetting spring, and the other end is locked and matched with the other end of the jump buckle and drivingly cooperated with the protecting mechanism.

Preferably, the jump buckle has an U-shaped structure, including a first jump buckle arm and a second jump buckle arm arranged opposite to each other, and the bottom of the U-shaped structure of the jump buckle is configured to adjoin the end of the operating handle connected with the contact supporting rod, the first jump buckle arm has one end pivotally arranged, and the other end connected with one end of the second jump buckle arm, and the other end of the second jump buckle arm is locked and matched with the lock catch.

Preferably, the operating mechanism further includes a jump buckle-resetting spring, the jump buckle-resetting spring has one end connected with the circuit breaker housing, and other end connected with the jump buckle, when the plug-in circuit breaker is in the make-contact state, while a short-circuit fault and an overload fault occurs, the protecting mechanism actuates the lock catch to release the interlock with the jump buckle, then the plug-in circuit breaker trips, and the jump buckle-resetting spring actuates the jump buckle to be relocked with the lock catch, meanwhile the plug-in circuit breaker enters the break-contact state.

Preferably, the contact supporting rod has an arch structure in its entirety, one end provided with a supporting rod rotation shaft rotatably connected with the operating handle, and the other end provided with the movable contact, the movable contact includes a movable contact plate connected with the contact supporting rod and a movable contact point arranged at one end of the movable contact plate, and the other end of the movable contact plate is connected with the main tension spring; the middle of the contact supporting rod is also provided with a arc isolating plate, when the plug-in circuit breaker is in the break-contact state, the arc isolating plate enters between the movable contact and the stationary contact, in the make-contact state, the arc isolating plate moves out between the movable contact and the stationary contact.

Preferably, the operating mechanism further includes a linkage member having a linkage rod and a linkage shaft arranged at one end of the linkage rod, the linkage shaft has two ends respectively pivoted on the circuit breaker housing and the middle provided with a polygonal hole in its axial direction, and the side of the linkage rod opposite to the jump buckle is provided with a linkage member activated stand, the second jump buckle arm is provided with a linkage member activating stand that is drivingly cooperated with the linkage member activated stand;
the plug-in circuit breaker includes a plurality of protective poles, the linkage shafts of which are connected with each other by linkage member connecting shafts, and the linkage member connecting shafts fit with the polygonal hole of each linkage member, respectively, when a certain protective pole trips, the linkage member activating stand of the jump buckle of the protective pole drives the linkage rod to swing by the linkage member activated stand, thus the linkage rod drives the linkage shaft to rotate, so as to drive the linkage rods of other protective poles to swing, knocking the lock catch of each protective pole, respectively, so that each protective pole trips synchronously.

Preferably, the magnetic yoke is arranged on one side of the lock catch, and the dual metal piece is arranged at the middle of the magnetic yoke and positioned between the magnetic yoke and the lock catch, having one end fixedly arranged and electrically connected with the first wire-outlet terminal, and the other end drivingly cooperated with the lock catch and electrically connected with the movable contact.

Preferably, the lock catch has the middle rotatably arranged on one end of the magnetic yoke, one end connected with the circuit breaker housing by the lock catch-resetting spring, and the other end arranged opposite to the magnetic yoke, the dual metal piece has the fixed end electrically connected with the first wire-outlet terminal by the first electroconductive plate, the other end electrically connected with the contact supporting rod through a soft connection, and the stationary contact is electrically connected with the first wire-inlet terminal.

Preferably, the cross section of the magnetic yoke has a <IMG> shaped structure, and one end of the magnetic yoke is provided with two yoke supporting arms arranged opposite to each other, on which there is a yoke limiting groove arranged; the lock catch includes a lock catch-resetting end, a lock catch supporting arm, a lock catch body, a lock catch hole and a lock catch activated end, the lock catch-resetting end, the lock catch body and the lock catch activated end are connected with each other in sequence, the lock catch-supporting arm is arranged on both sides of the connection between the lock catch-resetting end and the lock catch body, the lock catch activated end has a L-shaped structure, one end crookedly connected with the lock catch body, and the other end drivingly cooperated with the dual metal piece, two lock catch-supporting arms are respectively arranged inside two yoke limiting grooves, the lock catch body is arranged opposite to the magnetic yoke, the lock catch hole is arranged on the lock catch body and is locked and matched with the jump buckle.

Preferably, the plug-in circuit breaker further includes a locking mechanism that has a first locking member, one end of which is slidably arranged inside the circuit breaker housing, and the other end of which is a first protrusion protruding outside the circuit breaker housing.

When the plug-in circuit breaker is assembled to a circuit breaker assembling position, the housing of the circuit breaker assembling position presses the first protrusion, so that the first locking member moves in its entirety to the inside of the circuit breaker housing. After the plug-in circuit breaker has been assembled to reach the designated position, the first protrusion protrudes outside the circuit breaker housing and is in limit fit with the housing of the circuit breaker assembling position.

The locking mechanism further includes a second locking member, the middle of which is rotatably arranged, one end of which is drivingly cooperated with an operating button, and the other end of which is drivingly cooperated with the first locking member. When the plug-in circuit breaker is in a break-contact state, pulling the operating button actuates the first protrusion to move toward the inside of the circuit breaker housing by the second locking member, so as to release the limit fit between the first protrusion and the housing of the circuit breaker assembling position.

Preferably, the second locking member further includes a second protrusion, which is arranged at one end of the fit between the second locking member and the first locking member.

When the plug-in circuit breaker is in a make-contact state, the operating button actuates the second locking member to rotate, so that the second protrusion protrudes outside the circuit breaker housing. When the plug-in circuit breaker is in a break-contact state, the operating button actuates the second locking member to rotate, so that the second protrusion moves into the circuit breaker housing.

Preferably, one end of the operating button inserted inside the circuit breaker housing is a button inner end, and the other end of the operating button protruding outside the circuit breaker housing is a button outer end; an indicator slot is arranged inside the operating button, an indicating hole is arranged on the button outer end, and the indicating hole communicates with one end of the indicator slot; the plug-in circuit breaker further includes an indicating member slidably inserted in said indicator slot, one end of the indicating member is provided with a make-contact indicating surface and a break-contact indicating surface both respectively fitting with the indicating hole;
when the plug-in circuit breaker is in the break-contact state, the break-contact indicating surface is arranged opposite to the indicating hole, thus during pressing the operating button to move it toward the make-contact position, the indicating member moves in its entirety inside the indicator slot, after the plug-in circuit breaker enters the make-contact state, the make-contact indicating surface is arranged opposite to the indicating hole, thus during pulling the operating button to move it toward the break-contact position, the indicating member moves in its entirety inside the indicator slot, after the plug-in circuit breaker enters the break-contact state, the break-contact indicating surface is arranged opposite to the indicating hole.

Preferably, an indicator tracking shaft is arranged on the indicating member, an indicator tracking groove is arranged on the circuit breaker housing, the indicator tracking groove is an oblique tracking groove, the indicator tracking shaft is slidably arranged in the indicator tracking groove; when pressing/pulling the operating button, the indicator tracking groove drives the indicating member to move in its entirety in the indicator slot by the indicator tracking shaft, so that the make-contact indicating surface /break-contact indicating surface is arranged opposite to the indicating hole; the operating button further includes an indicator sliding groove respectively arranged on a pair of side walls of the indicator slot, the extension direction of the indicator sliding groove is perpendicular to the movement direction of the operating button; the indicating member further includes two indicator sliding stands respectively arranged on a pair of side surfaces thereof, the indicator sliding stand is slidably arranged in the indicator sliding groove.

In the plug-in circuit breaker of the present invention, the protecting mechanism is arranged between the first wire-outlet terminal and the arc extinguishing system and positioned on one side of the operating mechanism, and the arrangement of its protective pole is more compact, so it significantly reduces the volume of the plug-in circuit breaker and facilitates saving the internal space of communication cabinets in keeping with the development trend of miniaturizing communication cabinets.

In addition, the protecting mechanism has a simple structure, and the lock catch is directly actuated by the magnetic yoke, so it not only ensures the functions of short-circuit protection and overload protection, but also significantly reduces the space occupied by it, facilitating decreasing the volume of the plug-in circuit breaker.

We further describe the embodiments of the plug-in circuit breaker according to the present invention as follows in combination with the examples shown in <FIG>. The plug-in circuit breaker of the present invention is not limited to the description of the following embodiments.

The plug-in circuit breaker of the present invention includes a circuit breaker housing and at least one protective pole, wherein the circuit breaker housing includes at least one protective pole-mounting cavity fitting with the protective pole by one-to-one, each protective pole includes the operating button 1d, the operating mechanism <NUM> arranged inside the protective pole-mounting cavity and drivingly connected with the operating button 1d, the protecting mechanism <NUM> drivingly cooperated with the operating mechanism <NUM>, the arc extinguishing system <NUM>, the first wire-inlet terminal <NUM>, the first wire-outlet terminal <NUM>, the movable contact <NUM> connected with the operating mechanism <NUM>, and the stationary contact <NUM> fitting with the movable contact <NUM>.

It should be pointed out that the plug-in circuit breaker of the present invention can be configured to be a single-pole circuit breaker (a circuit breaker only having one protective pole), or a two-pole circuit breaker with one protective pole, or a two-pole circuit breaker with two protective poles, or a three-pole circuit breaker with three protective poles, or a four-pole circuit breaker with three protective poles, or a four-pole circuit breaker with four protective poles.

Preferably, as shown in <FIG> and <FIG>, one end of the operating button 1d is inserted into the circuit breaker housing, said operating button 1d and said first wire-outlet terminal <NUM> are arranged at one end of the circuit breaker housing, and said first wire-inlet terminal <NUM> is arranged and at the other end of the circuit breaker housing. The arc extinguishing system <NUM> is arranged in the middle of the protective pole-mounting cavity and positioned on one side of the first wire-inlet terminal <NUM>, the operating mechanism <NUM> is arranged between the operating button 1d and the arc extinguishing system <NUM>, and the protecting mechanism <NUM> is arranged between the first wire-outlet terminal <NUM> and the arc extinguishing system <NUM> and positioned on one side of the operating mechanism <NUM>. In the plug-in circuit breaker of the present invention, the arrangement of its protective pole is more compact, so it significantly reduces the volume of the plug-in circuit breaker and facilitates saving the internal space of communication cabinets in keeping with the development trend of miniaturizing communication cabinets. Specifically, in the direction shown in <FIG>, from left to right, the protecting mechanism <NUM> and the operating mechanism <NUM> are arranged side by side in the width direction of the circuit breaker housing, about <NUM>/<NUM> of which is occupied by the protecting mechanism <NUM>, and about <NUM>/<NUM> of which is occupied by the operating mechanism <NUM>; and the arc extinguishing system <NUM> is arranged below the protecting mechanism <NUM> and the operating mechanism <NUM>, occupying about <NUM>/<NUM> of the width of the circuit breaker housing.

Preferably, as shown in <FIG>, when the plug-in circuit breaker is in a make-contact state, and the operating mechanism <NUM> is in a locking state, thus a short-circuit fault or an overload fault occurs, at this time the protecting mechanism <NUM> actuates the operating mechanism <NUM> to trip off, then the plug-in circuit breaker trips and the operating mechanism <NUM> enters an unlocking state (as shown in <FIG>), pulling the operating button 1d to move it toward the break-contact position actuates the operating mechanism <NUM> to return to the locking state, thus the plug-in circuit breaker enters the break-contact state (as shown in <FIG>). Further, as shown in <FIG>, the operating mechanism <NUM> includes the U-shaped connecting rod <NUM>,the operating handle <NUM>, the contact supporting rod <NUM>, the jump buckle <NUM>, the lock catch <NUM>, the lock catch-resetting spring <NUM> and the main tension spring <NUM>. The operating handle <NUM> is pivotally arranged on the circuit breaker housing. One end of the operating handle <NUM> is drivingly connected with the operating button 1d by the U-shaped connecting rod <NUM>, and the other end of the operating handle <NUM> is rotatably connected with one end of the contact supporting rod <NUM>, the other end of which is provided with the movable contact <NUM>. The jump buckle <NUM> has one end pivotally arranged on the circuit breaker housing, and the middle part connected with the end of the contact supporting rod <NUM> provided with the movable contact <NUM> by the main tension spring <NUM>. The lock catch <NUM> has the middle part rotatably arranged, one end connected with the lock catch-resetting spring <NUM>, and the other end is locked and matched with the other end of the jump buckle <NUM> and drivingly cooperated with the protecting mechanism <NUM>. Further, one end of the lock catch <NUM> is connected with the circuit breaker housing by the lock catch-resetting spring <NUM>.

Preferably, as shown in <FIG>, when the plug-in circuit breaker is in the make-contact state, thus a short-circuit fault or an overload fault occurs, at this time the protecting mechanism <NUM> actuates the operating mechanism <NUM> to act, so that the plug-in circuit breaker enters the break-contact state (as shown in <FIG>), after clearing the fault, pressing the operating button 1d to move it toward the make-contact position actuates the operating mechanism <NUM> to act, then the plug-in circuit breaker enters the make-contact state. Further, as shown in <FIG> <FIG>, the operating mechanism <NUM> includes the U-shaped connecting rod <NUM>, the operating handle <NUM>, the contact supporting rod <NUM>, the jump buckle <NUM>, the lock catch <NUM>, the lock catch-resetting spring <NUM>, the main tension spring <NUM> and the jump buckle-resetting spring <NUM>. The operating handle <NUM> is pivotally arranged on the circuit breaker housing. One end of the operating handle <NUM> is drivingly connected with the operating button 1d by the U-shaped connecting rod <NUM>, and the other end of the operating handle <NUM> is rotatably connected with one end of the contact supporting rod <NUM>, the other end of which is provided with the movable contact <NUM>. The jump buckle <NUM> has one end pivotally arranged on the circuit breaker housing, and the middle part connected with the end of the contact supporting rod <NUM> provided with the movable contact <NUM> by the main tension spring <NUM>. The lock catch <NUM> has the middle part rotatably arranged, one end connected with the circuit breaker housing by the lock catch-resetting spring <NUM>, and the other end is locked and matched with the other end of the jump buckle <NUM> and drivingly cooperated with the protecting mechanism <NUM>. The jump buckle-resetting spring <NUM> has one end connected with the circuit breaker housing, and other end connected with the jump buckle <NUM>. When the plug-in circuit breaker is in the make-contact state, thus a short-circuit fault or an overload fault occurs, at this time the protecting mechanism <NUM> actuates the lock catch <NUM> to release the interlock with the jump buckle <NUM>, then the plug-in circuit breaker trips, and the jump buckle-resetting spring <NUM> actuates the jump buckle <NUM> to be relocked with the lock catch <NUM>, meanwhile the plug-in circuit breaker enters the break-contact state.

Preferably, as shown in <FIG>, the protecting mechanism <NUM> includes the magnetic yoke <NUM> and the dual metal piece <NUM>. The magnetic yoke <NUM> is arranged on one side of the lock catch <NUM>, and the dual metal piece <NUM> is arranged at the middle of the magnetic yoke <NUM> and positioned between the magnetic yoke <NUM> and the lock catch <NUM>, having one end fixedly arranged and electrically connected with the first wire-outlet terminal <NUM>, and the other end drivingly cooperated with the lock catch <NUM> and electrically connected with the movable contact <NUM>. When the plug-in circuit breaker is in the make-contact state, thus a short-circuit fault occurs, at this time the lock catch <NUM> is attracted to swing toward the magnetic yoke <NUM>, releasing the interlock with the jump buckle <NUM>. When the plug-in circuit breaker is in the make-contact state, thus an overload fault occurs, at this time the dual metal piece <NUM> bends and actuates the lock catch <NUM> to swing toward the magnetic yoke <NUM>, releasing the interlock with the jump buckle <NUM>. The protecting mechanism <NUM> of the present invention has both functions of short-circuit protection and overload protection, and a simple and compact structure, and can effectively reduce the required assembly space during reliably performing protection function, facilitating the development trend of miniaturizing the plug-in circuit breaker.

Preferably, as shown in <FIG>, the plug-in circuit breaker of the present invention further includes at least two auxiliary signal terminals that are connected to external circuits in a plug-in and plug-out mode. While the movable contact <NUM> is electrically connected to the first wire-outlet terminal <NUM>, the stationary contact <NUM> is electrically connected to the first wire-inlet terminal <NUM>. Each auxiliary signal terminal is electrically connected to the first wire-outlet terminal <NUM>, and a signal processing element is connected in series between at least one auxiliary signal terminal and the first wire-outlet terminal <NUM>. Further, the signal processing element includes at least one diode. Further, the plug-in circuit breaker of the present invention further includes the second wire-inlet terminal <NUM> arranged side by side with the first wire-inlet terminal <NUM> at one end of the circuit breaker housing, and the second wire-outlet terminal <NUM> arranged side by side with the first wire-outlet terminal <NUM> at the other end of the plug-in circuit breaker, and the two auxiliary signal terminals are arranged side by side between the first wire-inlet terminal <NUM> and the second wire-inlet terminal <NUM>. In the plug-in circuit breaker of the present invention, the auxiliary signal terminals make use of the movable/stationary contact to generate auxiliary signals, saving the space and costs on the installation of auxiliary contacts or similar accessories, facilitating simplifying the structure of the circuit breaker in keeping with the trend of miniaturizing plug-in circuit breakers, and output signals form the auxiliary signal terminals can be employed to judge the make-contact/break-contact state of the plug-in circuit breaker, such as realizing remote monitoring.

Preferably, as shown in <FIG>, in the plug-in circuit breaker of the present invention, one end of the operating button 1d inserted inside the circuit breaker housing is a button inner end, and the other end of the operating button 1d protruding outside the circuit breaker housing is a button outer end. An indicator slot is arranged inside the operating button 1d, the indicating hole 12d is arranged on the button outer end, and the indicating hole 12d communicates with one end of the indicator slot. The plug-in circuit breaker further includes the indicating member <NUM>, one end of which is provided with the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> both respectively fitting with the indicating hole 12d. When the plug-in circuit breaker is in the break-contact state, the break-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d, thus during pressing the operating button 1d to move it toward the make-contact position, the indicating member <NUM> moves in its entirety inside the indicator slot. After the plug-in circuit breaker enters the make-contact state, the make-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d, thus during pulling the operating button 1d to move it toward the break-contact position, the indicating member <NUM> moves in its entirety inside the indicator slot. After the plug-in circuit breaker enters the break-contact state, the break-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d.

Further, the movement direction of the operating button 1d is perpendicular to the movement direction of the indicating member <NUM> within the indicator slot.

Further, as shown in <FIG> and <FIG>, the operating button 1d further includes the indicator sliding groove 100d respectively arranged on a pair of side walls of the indicator slot, and the extension direction of the indicator sliding groove 100d is perpendicular to the movement direction of the operating button 1d. The indicating member <NUM> further includes two indicator sliding stands <NUM> respectively arranged on a pair of side surfaces thereof, and the indicator sliding stand <NUM> is slidably arranged in the indicator sliding groove 100d.

Further, as shown in <FIG>, <FIG> and <FIG>, the indicating member <NUM> further includes the indicator tracking shaft <NUM> arranged at the other end of the indicating member <NUM>. An indicator tracking groove is arranged on the circuit breaker housing, and the indicator tracking shaft <NUM> is slidably arranged in the indicator tracking groove. When pressing/pulling the operating button 1d, the indicator tracking groove drives the indicating member <NUM> to move in its entirety in the indicator slot by the indicator tracking shaft <NUM>, so that the make-contact indicating surface <NUM>/break-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d.

In the plug-in circuit breaker of the present invention, the indicating member <NUM> is inserted into the indicator slot arranged inside the operating button 1d with less occupied space, facilitating the design of miniaturizing the circuit breaker. The make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> of the indicating member <NUM> are arranged opposite to the indicating hole 12d, respectively, so that users can intuitively observe through the indicating hole 12d to quickly judge the make-contact/break-contact state of the circuit breaker. Moreover, the indicating member moves in its entirety in the indicator slot, so as to switch between the make-contact indicating surface and the break-contact indicating surface both displayed in the indicating hole, so the indicating member acts more accurately with minor error, thus the make-contact indicating surface or the break-contact indicating surface completely covers the indicating hole, avoiding both the make-contact indicating surface and the break-contact indicating surface from being displayed inside the indicating hole at the same time and resulting in occurrence of misjudgment by users, and facilitating improving the user's electrical safety. The indicator sliding groove 100d fits with the indicator sliding stand <NUM> to limit the movement path of the indicating member <NUM> and ensure the reliability of indication results.

As shown in <FIG>, there is an embodiment of the plug-in circuit breaker of the present invention.

The plug-in circuit breaker of the present invention includes a circuit breaker housing and at least one protective pole, wherein the circuit breaker housing includes at least one protective pole-mounting cavity fitting with the protective pole by one-to-one, each protective pole includes the operating button 1d, the operating mechanism <NUM> arranged inside the protective pole-mounting cavity and drivingly connected with the operating button 1d, the protecting mechanism <NUM> drivingly cooperated with the operating mechanism <NUM>, the arc extinguishing system <NUM>, the first wire-inlet terminal <NUM>, the first wire-outlet terminal <NUM>, the movable contact <NUM> connected with the operating mechanism <NUM>, and the stationary contact <NUM> fitting with the movable contact <NUM>. One end of the operating button 1d is inserted into the circuit breaker housing, at one end of which the operating button 1d and the first wire-outlet terminal <NUM> are both arranged, and at the other end of which the first wire-inlet terminal <NUM> is arranged. The arc extinguishing system <NUM> is arranged in the middle of the protective pole-mounting cavity and positioned on one side of the first wire-inlet terminal <NUM>, the operating mechanism <NUM> is arranged between the operating button 1d and the arc extinguishing system <NUM>, and the protecting mechanism <NUM> is arranged between the first wire-outlet terminal <NUM> and the arc extinguishing system <NUM> and positioned on one side of the operating mechanism <NUM>.

Specifically, as shown in <FIG>, the plug-in circuit breaker of the present invention is a two-pole circuit breaker, including a protective pole and a neutral pole, wherein the protective pole is a L pole, and the neutral pole is a N pole. The plug-in circuit breaker also includes a circuit breaker housing composed of the front cover 1c, the base 1b and the rear cover 1a, wherein the front cover 1c and the base 1b define the protective pole mounting cavity fitting with the protective pole by one-to-one, and the base 1b and the rear cover 1a define the neutral pole mounting cavity fitting with the neutral pole. The circuit breaker housing includes the upper side <NUM>, the lower side <NUM>, the front side <NUM>, the rear side <NUM>, the left side <NUM> and the right side <NUM>. As shown in <FIG>, the lower end of the operating button 1d is inserted in the circuit breaker housing, the operating button 1d and the first wire-outlet terminal <NUM> are arranged on the upper end of the circuit breaker housing, the first wire-inlet terminal <NUM> is arranged on the lower end of the circuit breaker housing, the arc extinguishing system <NUM> is arranged in the middle of the protective pole mounting cavity and positioned on the upper side of the first wire-inlet terminal <NUM>, the operating mechanism <NUM> is arranged between the operating button 1d and the arc extinguishing system <NUM>, the protecting mechanism <NUM> is arranged between the first wire-outlet terminal <NUM> and the arc extinguishing system <NUM> and positioned on the left side of the operating mechanism <NUM>.

Preferably, as shown in <FIG>, the neutral pole further includes the second wire-inlet terminal <NUM> arranged with the first wire-inlet terminal <NUM> side by side on lower end of the circuit breaker housing, and the second wire-outlet terminal <NUM> arranged with the first wire-outlet terminal <NUM> side by side on the upper end of the circuit breaker housing, and the second wire-inlet terminal <NUM> is electrically connected with the second wire-outlet terminal <NUM> through the second electroconductive plate 2a. Specifically, as shown in <FIG>, the first wire-inlet terminal <NUM> and the second wire-inlet terminal <NUM> are arranged on the right and left parts of the lower end of the circuit breaker housing, respectively; the first wire-outlet terminal <NUM> and the second wire-outlet terminal <NUM> are both arranged on the left side of the operating button 1d.

Preferably, as shown in <FIG>, the first wire-inlet terminal <NUM> and the second wire-inlet terminal <NUM> both include the first elastic elements 2c, each of which includes a first reed connecting plate and two first reed clamping plates arranged opposite to each other, which are crookedly connected with the two ends of the first reed connecting plate respectively, and each first reed clamping plate has a "< " structure, thus the two first reed clamping plates are integrally formed into an X-shaped structure.

As shown in <FIG>, there is the first embodiment of the operating mechanism <NUM> in the plug-in circuit breaker of the present invention.

The operating mechanism <NUM> of the first embodiment includes the U-shaped connecting rod <NUM>,the operating handle <NUM>, the contact supporting rod <NUM>, the jump buckle <NUM>, the lock catch <NUM>, the lock catch-resetting spring <NUM> and the main tension spring <NUM>. The operating handle <NUM> is pivotally arranged on the circuit breaker housing. One end of the operating handle <NUM> is drivingly connected with the operating button 1d by the U-shaped connecting rod <NUM>, and the other end of the operating handle <NUM> is rotatably connected with one end of the contact supporting rod <NUM>, the other end of which is provided with the movable contact <NUM>. The jump buckle <NUM> has one end pivotally arranged on the circuit breaker housing, and the middle part connected with the end of the contact supporting rod <NUM> provided with the movable contact <NUM> by the main tension spring <NUM>. The lock catch <NUM> has the middle part rotatably arranged, one end connected with the lock catch-resetting spring <NUM>, and the other end interlocked with the other end of the jump buckle <NUM> and drivingly cooperated with the protecting mechanism <NUM>. Further, the lock catch-resetting spring <NUM> has one end connected to one end of the lock catch <NUM> and the other end connected to the circuit breaker housing. Specifically, the lock catch-resetting spring <NUM> may be a torsion spring or a straight spring.

Further, as shown in <FIG>, the jump buckle <NUM> has an U-shaped structure (see <FIG> ), including the first jump buckle arm <NUM> a and the second jump buckle arm <NUM> b arranged opposite to each other, and the bottom of the U-shaped structure of the jump buckle <NUM> is configured to adjoin the end of the operating handle <NUM> connected with the contact supporting rod <NUM>. The first jump buckle arm 32a has one end pivotally arranged, and the other end connected with one end of the second jump buckle arm 32b, and the other end of the second jump buckle arm 32b is locked with the lock catch <NUM>.

Further, as shown in <FIG>, the contact supporting rod <NUM> has an arch structure in its entirety, one end provided with the supporting rod rotation shaft <NUM> rotatably connected with the operating handle <NUM>, and the other end provided with the movable contact <NUM> (see <FIG>). The movable contact <NUM> includes the movable contact plate <NUM> connected with the contact supporting rod <NUM> and the movable contact point <NUM> arranged at one end of the movable contact plate <NUM>, and the other end of the movable contact plate <NUM> is connected with the main tension spring <NUM>. Further, the middle of the contact supporting rod <NUM> is also provided with the arc isolating plate <NUM> (see <FIG> ). When the plug-in circuit breaker is in the break-contact state, the arc isolating plate <NUM> enters between the movable contact <NUM> and the stationary contact <NUM>, in the make-contact state, the arc isolating plate <NUM> moves out between the movable contact <NUM> and the stationary contact <NUM>.

Further, as shown in <FIG>, the contact supporting rod <NUM> further includes the linkage member <NUM> having the linkage rod <NUM> and the linkage shaft <NUM> arranged at one end of the linkage rod <NUM>. The linkage shaft <NUM> has two ends respectively pivoted on the circuit breaker housing and the middle provided with the polygonal hole <NUM> in its axial direction, and the side of the linkage rod <NUM> opposite to the jump buckle <NUM> is provided with the linkage member activated stand <NUM>. The second jump buckle arm 32b is provided with the linkage member activating stand <NUM> that is drivingly cooperated with the linkage member activated stand <NUM>. The plug-in circuit breaker includes a plurality of protective poles, the linkage shafts <NUM> of which are connected with each other by linkage member connecting shafts, and the linkage member connecting shafts fit with the polygonal hole <NUM> of each linkage member <NUM>, respectively. When a certain protective pole trips, the linkage member activating stand <NUM> of the jump buckle <NUM> of the protective pole drives the linkage rod <NUM> to swing by the linkage member activated stand <NUM>, thus the linkage rod <NUM> drives the linkage shaft <NUM> to rotate, and the linkage shaft <NUM> drives the linkage rods <NUM> of other protective poles to swing by the linkage member connecting shaft, knocking the lock catch <NUM> of each protective pole, respectively, so as to make each protective pole trip synchronously. Further, the linkage members <NUM> of each protective pole can be connected with each other by one linkage member connecting shaft, or two adjacent protective poles are connected with each other by one linkage member connecting shaft.

Specifically, as shown in <FIG>, the jump buckle <NUM> and the contact supporting rod <NUM> are both arranged below the operating handle <NUM>, and the operating handle <NUM> has the upper end connected to the operating button 1d by the U-shaped connecting rod <NUM>, the middle pivotally arranged on the circuit breaker housing, and the lower end rotatably connected with the supporting rod rotation shaft <NUM> on the upper end of the contact supporting rod <NUM>. The jump buckle <NUM> has an U-shaped structure with its opening facing downward, and includes the second jump buckle arm 32b and the first jump buckle arm 32a respectively arranged on the left and right sides of the jump buckle <NUM>. The first jump buckle arm 32a has the upper end pivotally arranged on the circuit breaker housing, and the upper end connected to the upper end of the second jump buckle arm 32b, and the lower end of the second jump buckle arm 32b is locked with with the lock catch <NUM>. The middle of the jump buckle <NUM> is connected with the upper end of the movable contact plate <NUM> of the contact supporting rod <NUM> by the main tension spring <NUM>. The contact supporting rod <NUM> has the upper end stacked on the front side of the middle of the jump buckle <NUM>, and the lower end provided with the movable contact <NUM> including the movable contact plate <NUM>, and the movable contact plate <NUM> has the right side of the lower end provided with the movable contact point <NUM>, and the upper end connected to the lower end of the main tension spring <NUM>. The arc isolating plate <NUM> has the left end rotatably connected with the lower end of the contact supporting rod <NUM>, and the right end fitting with the movable contact <NUM> and the stationary contact <NUM>, extends between the movable contact <NUM> and the stationary contact <NUM> in the break-contact state, and moves out between the movable contact <NUM> and the stationary contact <NUM> in the make-contact state. Preferably, the contact supporting rod <NUM> is provided with the rod-barrier limit groove, when the contact supporting rod <NUM> drives the movable contact <NUM> and the stationary contact <NUM> to be in the break/make-contact state, the rod-barrier limit groove drives the arc isolating plate <NUM> to extend into and out of the space between the movable contact and the stationary contact and limits the swing scope of the right end of the arc isolating plate <NUM>. The lock catch <NUM> is arranged on the left side of the jump buckle <NUM>, and has the middle part pivotally arranged, the upper end connected to the circuit breaker housing by the lock catch-resetting spring <NUM>, and the lower end interlocked with the lower end of the second jump buckle arm 32b of the jump buckle <NUM>. The linkage member <NUM> is arranged between the lock catch <NUM> and the jump buckle <NUM>, and the linkage rod <NUM> has the upper end pivoted by the linkage shaft <NUM>, and the middle part positioned on the right side below the linkage shaft <NUM> and provided with the linkage member activated stand <NUM>. The left side of the upper end of the second jump buckle arm 32b is provided with the linkage member activating stand <NUM> drivingly cooperated with the linkage member activated stand <NUM>. Preferably, as shown in <FIG>, the operating handle <NUM> is pivotally arranged on the circuit breaker housing by the operating handle mounting shaft <NUM>. Further, both ends of the operating handle mounting shaft <NUM> are pivotally connected to the front cover 1c and the base 1b, respectively. Further, as shown in <FIG>, the operating handle <NUM> further includes a handle-connection hole fitting with the U-shaped connecting rod <NUM>, a handle-support hole fitting with the supporting rod rotation shaft <NUM> of the contact supporting rod <NUM>, and a handle shaft hole fitting with the operating handle mounting shaft <NUM>. The shape of the operating handle <NUM> is approximately a triangle, at three vertices of which there are the handle-connection hole, the handle shaft hole and the handle-support hole respectively arranged.

Preferably, as shown in <FIG>, the lower end of the first jump buckle arm 32a of the jump buckle <NUM> is pivotally arranged on the circuit breaker housing by the jump buckle mounting shaft <NUM>. Further, the two ends of the jump buckle mounting shaft <NUM> are pivotally connected to the front cover 1c and the base 1b, respectively. Preferably, as shown in <FIG>, the middle of the jump buckle <NUM> is provided with the jump buckle-spring connection hole <NUM> connected with one end of the main tension spring <NUM>, and the upper end of the movable contact plate <NUM> is provided with the movable contact plate-spring connection hole <NUM>. Preferably, as shown in <FIG>, the lower end of the second jump buckle arm 32b has a wedge-shaped structure, and the lower end of the jump buckle <NUM> is provided with the lock catch hole <NUM> interlocked with the lower end of the second jump buckle arm 32b.

As shown in <FIG>, there is the second embodiment of the operating mechanism <NUM> in the plug-in circuit breaker of the present invention.

The operating mechanism <NUM> of the second embodiment is different from that of the first embodiment in that it further includes the jump buckle-resetting spring <NUM>, one end of which is connected with the circuit breaker housing, and the other end of which is connected with the jump buckle <NUM>. When the plug-in circuit breaker is in the make-contact state, thus a short-circuit fault or an overload fault occurs, at this time the protecting mechanism <NUM> actuates the lock catch <NUM> to release the coupling with the jump buckle <NUM>, then the plug-in circuit breaker trips, and the jump buckle-resetting spring <NUM> actuates the jump buckle <NUM> to rotate, so that the jump buckle <NUM> is recoupled with the lock catch <NUM>, meanwhile the plug-in circuit breaker enters the break-contact state. Further, the jump buckle-resetting spring <NUM> is a torsion spring encircling the jump buckle-resetting spring shaft <NUM> positioned on one side of the first jump buckle arm 32a, and the two ends of the jump buckle-resetting spring shaft <NUM> are fixed on the circuit breaker housing, respectively. The middle of the first jump buckle arm 32a is provided with the jump buckle-resetting protrusion <NUM>, and the jump buckle-resetting spring <NUM> has one end connected with the circuit breaker housing, and the other end connected with the jump buckle <NUM>.

Specifically, as shown in <FIG>, after the lock catch <NUM> is released from the coupling with the jump buckle <NUM>, while the jump buckle <NUM> rotates counterclockwise, the contact supporting rod <NUM> rotates clockwise, after the contact supporting rod <NUM> drives the movable contact <NUM> to enter the tripping position, the jump buckle-resetting spring <NUM> enables the jump buckle <NUM> to rotate clockwise by the jump buckle-resetting protrusion <NUM> until the lower end of the second jump buckle arm 32b is relocked with the lock catch <NUM> again.

As shown in <FIG>, there is an embodiment of the protecting mechanism <NUM> in the plug-in circuit breaker of the present invention.

The protecting mechanism <NUM> includes the magnetic yoke <NUM> and the dual metal piece <NUM>. The magnetic yoke <NUM> is arranged on one side of the lock catch <NUM>, and the dual metal piece <NUM> is arranged at the middle of the magnetic yoke <NUM> and positioned between the magnetic yoke <NUM> and the lock catch <NUM>, having one end fixedly arranged and electrically connected with the first wire-outlet terminal <NUM>, and the other end drivingly cooperated with the lock catch <NUM> and electrically connected with the movable contact <NUM>. When the plug-in circuit breaker is in the make-contact state, thus a short-circuit fault occurs, at this time the lock catch <NUM> is attracted to swing toward the magnetic yoke <NUM>, releasing the interlock with the jump buckle <NUM>. When the plug-in circuit breaker is in the make-contact state, thus an overload fault occurs, at this time the dual metal piece <NUM> actuates the lock catch <NUM> to swing toward the magnetic yoke <NUM>, releasing the interlock with the jump buckle <NUM>.

Specifically, as shown in <FIG>, while the magnetic yoke <NUM> is arranged on the left side of the lock catch <NUM>, the dual metal piece <NUM> is arranged at the middle of the magnetic yoke <NUM> and positioned between the magnetic yoke <NUM> and the lock catch <NUM>, and the lock catch <NUM> has the upper end fixedly arranged, the middle part rotatably arranged, and the lower end arranged opposite to the magnetic yoke <NUM>, drivingly cooperated with the dual metal piece <NUM> and interlocked with the jump buckle <NUM>. When the plug-in circuit breaker is in the make-contact state, thus a short-circuit fault occurs, at this time the short-circuit current flows through the dual metal piece <NUM>, and the generated magnetic field is strengthened by the magnetic yoke <NUM>, so that the lower end of lock catch <NUM> is attracted to swing toward the magnetic yoke <NUM>, so as to release the interlock with the jump buckle <NUM>. When the plug-in circuit breaker is in the make-contact state, thus an overload fault occurs, at this time the dual metal piece <NUM> generates heat and bends to the left, actuating the lower end of the lock catch <NUM> to swing toward the magnetic yoke <NUM>, so as to release the interlock with the jump buckle <NUM>.

Preferably, as shown in <FIG>, the lock catch <NUM> has the middle rotatably arranged on one end of the magnetic yoke <NUM>, one end connected with the circuit breaker housing by the lock catch-resetting spring <NUM>, and the other end arranged opposite to the magnetic yoke <NUM>. The dual metal piece <NUM> has the fixed end electrically connected with the first wire-outlet terminal <NUM> by the first electroconductive plate 2b (see <FIG> ), the other end electrically connected with the contact supporting rod <NUM> through the soft connection <NUM>, and the stationary contact <NUM> is electrically connected with the first wire-inlet terminal <NUM>. Further, the protection mechanism <NUM> also includes an adjustment screw which is in limit fit with the circuit breaker housing, and which has one end threadedly engaged with the end of the first electroconductive plate 2b connected with the dual metal piece <NUM>, so as to adjust the position of the dual metal piece <NUM>, and furthermore the tripping threshold or parameter of the dual metal piece <NUM>.

Specifically, as shown in <FIG>, the lock catch <NUM> has the middle rotatably arranged on the upper end of the magnetic yoke <NUM>, the upper end connected with the circuit breaker housing by the lock catch-resetting spring <NUM>, and the lower end arranged opposite to the magnetic yoke <NUM>. The dual metal piece <NUM> has the upper end electrically connected with the first wire-outlet terminal <NUM> by the first electroconductive plate 2b, and the lower end electrically connected with the contact supporting rod <NUM> through the soft connection <NUM>, and the stationary contact <NUM> is electrically connected with the first wire-inlet terminal <NUM>.

Preferably, the first electroconductive plate 2b is electrically connected with the contact supporting rod <NUM> through a second soft connection, adding a circuit extending from the second electroconductive plate 2b to the contact supporting rod. Therefore, when a short-circuit fault occurs in a plug-in circuit breaker specified with a large ampere rated current, the current flowing in the dual metal piece is reduced, avoiding the occurrence of the failure of the dual metal piece from being overheated due to an excessive current.

Preferably, as shown in <FIG>, the cross section of the magnetic yoke <NUM> has a <IMG> shaped structure, and one end of the magnetic yoke <NUM> is provided with two yoke supporting arms <NUM> arranged opposite to each other (see <FIG> ), on which there is the yoke limiting groove <NUM> arranged. The lock catch <NUM> includes the lock catch-resetting end <NUM>, the lock catch supporting arm <NUM>, the lock catch body <NUM>, the lock catch hole <NUM> and the lock catch activated end <NUM> (see <FIG>), and the lock catch-resetting end <NUM>, the lock catch body <NUM> and the lock catch activated end <NUM> are connected with each other in sequence. The lock catch-supporting arm <NUM> is arranged on both sides of the connection between the lock catch-resetting end <NUM> and the lock catch body <NUM>, and the lock catch activated end <NUM> has a L-shaped structure, one end crookedly connected with the lock catch body <NUM>, and the other end drivingly cooperated with the dual metal piece <NUM>. The two lock catch-supporting arms <NUM> are respectively arranged inside two yoke limiting grooves <NUM>, the lock catch body <NUM> is arranged opposite to the magnetic yoke <NUM>, and the lock catch hole <NUM> is arranged on the lock catch body <NUM> and interlocked with the jump buckle <NUM>.

Specifically, as shown in <FIG>, and upper end of the magnetic yoke <NUM> is provided with two yoke supporting arms <NUM> arranged opposite to each other (see <FIG> ), on which there is the yoke limiting groove <NUM> arranged. The lock catch body <NUM> has the upper end crookedly connected with the lock catch-resetting end <NUM>, and the lower end crookedly connected with the lock catch activated end <NUM>. While the lock catch-resetting end <NUM> bends to the right, the lock catch activated end <NUM> bends to the left, and the lock catch hole <NUM> is arranged in the middle of the lock catch body <NUM> to fit with the magnetic yoke <NUM>.

As shown in <FIG>, there is an embodiment of the arc extinguishing system <NUM> in the plug-in circuit breaker of the present invention.

The arc extinguishing system <NUM> includes the arc extinguishing chamber <NUM>, and the movable contact arcing plate <NUM> and the stationary contact arcing plate <NUM> respectively arranged on both sides of the arc extinguishing chamber <NUM>. The movable contact arcing plate <NUM> fits with the movable contact <NUM> and is electrically connected with the first wire-outlet terminal <NUM>, and the stationary contact arcing plate <NUM> has one end provided with the stationary contact <NUM>, and the other end electrically connected with the first wire-inlet terminal <NUM>.

Specifically, as shown in <FIG>, the movable contact arcing plate <NUM> and the stationary contact arcing plate <NUM> are respectively arranged on the left and right sides of the arc extinguishing chamber <NUM>, and the movable contact arcing plate <NUM> is electrically connected with the first wire-outlet terminal <NUM> and has the upper end fitting with the movable contact <NUM>. The stationary contact arcing plate <NUM> has the upper end provided with the stationary contact <NUM>, and the lower end electrically connected with the first wire-inlet terminal <NUM>, and the upper end of the movable contact arcing plate <NUM> and the upper end of the stationary contact arcing plate <NUM> bend to each other.

Preferably, as shown in <FIG>, the plug-in circuit breaker of the present invention further includes at least two auxiliary signal terminals that are connected to external circuits in a plug-in and plug-out mode. Each auxiliary signal terminal is electrically connected to the first wire-outlet terminal <NUM>, and a signal processing element is connected in series between at least one auxiliary signal terminal and the first wire-outlet terminal <NUM>. Further, the signal processing element includes at least one diode. Further, a signal processing element is connected in series between each auxiliary signal terminal and the first wire-outlet terminal <NUM>, or a signal processing element is connected in series between one auxiliary signal terminal and the first wire-outlet terminal <NUM>, and a signal processing element is not connected in series between another auxiliary signal terminal and the first wire-outlet terminal <NUM>. The plug-in circuit breaker of the present invention preferably adopts the latter method, so that the plug-in circuit breaker can output a DC signal through one auxiliary signal terminal and output an AC signal through another auxiliary signal terminal, so as to strengthen the adaptability of the plug-in circuit breaker and ensure to meet the requirements of different application environments.

It should be pointed out that the signal processing element is not limited to diodes, may be other elements capable of converting an AC signal into a DC signal. Of course, the signal processing element can also be simply added with functions according to user needs.

Specifically, as shown in <FIG>, the plug-in circuit breaker of the present invention includes two auxiliary signal terminals that are connected to the external circuit in a plug-in and plug-out mode, which are the first auxiliary signal terminal <NUM> and the second auxiliary signal terminal <NUM> respectively, and each auxiliary signal terminal is electrically connected with the first wire-outlet terminal <NUM> by the movable contact arcing plate <NUM>, and one diode is connected in series between the second auxiliary signal terminal <NUM> and the movable contact arcing plate <NUM>. Further, as shown in <FIG>, the first wire-inlet terminal <NUM>, the second wire-inlet terminal <NUM>, the first auxiliary signal terminal <NUM> and the second auxiliary signal terminal <NUM> are all arranged on the lower end of the plug-in circuit breaker, the first auxiliary signal terminal <NUM> and the second auxiliary signal terminal <NUM> are arranged side by side between the first wire-inlet terminal <NUM> and the second wire-inlet terminal <NUM>. Further, the auxiliary signal terminal can be connected to a circuit structure such as an external control circuit board, so as to realize for example remote monitoring.

Preferably, as shown in <FIG> and <FIG>, each auxiliary signal terminal includes the second elastic elements 2d, each of which includes a second reed connecting plate and two second reed clamping plates arranged opposite to each other, which are crookedly connected with the two ends of the second reed connecting plate respectively, and each second reed clamping plate has a "< " structure, thus the two second reed clamping plates are integrally formed into an X-shaped structure.

Preferably, as shown in <FIG>, the plug-in circuit breaker of the present invention further includes the air exhaust opening <NUM>, and a first exhaust passage is also provided in the protective pole mounting cavity. The first exhaust passage has one end communicating with the air vent of the arc extinguishing chamber <NUM> of the arc extinguishing system <NUM>, and the other end communicating with the external environment through the air exhaust opening <NUM>. Specifically, as shown in <FIG>, the air exhaust opening <NUM> is arranged on the lower end surface of the circuit breaker housing and positioned between the second auxiliary signal terminal <NUM> and the first wire-inlet terminal <NUM>.

Preferably, as shown in <FIG>, in the plug-in circuit breaker of the present invention, one end of the operating button 1d inserted inside the circuit breaker housing is a button inner end, and the other end of the operating button 1d protruding outside the circuit breaker housing is a button outer end. An indicator slot is arranged inside the operating button 1d, the indicating hole 12d is arranged on the button outer end, and the indicating hole 12d communicates with one end of the indicator slot. The plug-in circuit breaker further includes the indicating member <NUM> slidably inserted into the indicator slot, one end of the indicating member <NUM> is provided with the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> both respectively fitting with the indicating hole 12d. When the plug-in circuit breaker is in the break-contact state, the break-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d, thus during pressing the operating button 1d to move it toward the make-contact position, the indicating member <NUM> moves in its entirety inside the indicator slot. After the plug-in circuit breaker enters the make-contact state, the make-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d, thus during pulling the operating button 1d to move it toward the break-contact position, the indicating member <NUM> moves in its entirety inside the indicator slot. After the plug-in circuit breaker enters the break-contact state, the break-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d.

Preferably, the movement direction of the operating button 1d is perpendicular to the movement direction of the indicating member <NUM> within the indicator slot.

Preferably, as shown in <FIG>, the operating button 1d further includes the indicator sliding groove 100d respectively arranged on a pair of side walls of the indicator slot, and the extension direction of the indicator sliding groove 100d is perpendicular to the movement direction of the operating button 1d. as shown in <FIG>, the indicating member <NUM> further includes two indicator sliding stands <NUM> respectively arranged on a pair of side surfaces thereof, and the indicator sliding stand <NUM> is slidably arranged in the indicator sliding groove100d to restrict the movement path of the indicating member <NUM> inside the indicator sliding groove 100d.

Preferably, as shown in <FIG> and <FIG>, the indicating member <NUM> further includes the indicator tracking shaft <NUM> arranged at the other end of the indicating member <NUM>. as shown in <FIG>, an indicator tracking groove is arranged on the circuit breaker housing, and the indicator tracking shaft <NUM> is slidably arranged in the indicator tracking groove. When pressing/pulling the operating button 1d, the indicator tracking groove drives the indicating member <NUM> to move in its entirety in the indicator slot by the indicator tracking shaft <NUM>, so that the make-contact indicating surface <NUM>/break-contact indicating surface <NUM> is arranged opposite to the indicating hole 12d. The indicator tracking groove is an inclined tracking groove, which may be slantingly arranged in a straight line or in an arc. As another embodiment of moving the indicating member <NUM>, while an inclined actuating surface can also be provided on the indicating member <NUM>, a actuating protrusion can be provided on the circuit breaker housing, so that the indicating member moves horizontally with respect to the operating button 1d by means of the fit between the inclined actuating surface and the actuating protrusion, when the operating button 1d is pressed/pulled.

Further, as shown in <FIG>, the indicator tracking groove is an inclined tracking groove, which is formed by means of the fit between two inclined half-grooves arranged opposite to each other on the circuit breaker housing. When the plug-in circuit breaker is in the break-contact state, the indicator tracking shaft <NUM> is positioned at one end of the indicator tracking groove, which is the first tracking groove end; when the plug-in circuit breaker is in the make-contact state, the indicator tracking shaft <NUM> is positioned at the other end of the indicator tracking groove, which is the second tracking groove end. The first tracking groove end is closer to the button outer end of the operating button 1d than the second tracking groove end.

It should be pointed out that the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> may be different from each other in color, for example, the make-contact indicating surface is green, but the break-contact indicating surface is red; or the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> may be different from each other in characters or symbol identification, for example, the make-contact indicating surface <NUM> has the word " make-contact " or the symbol "|", and the break-contact indicating surface <NUM> has the word " break-contact " or the symbol "O". Of course, the implementation forms for both are not limited to the above two, as long as the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> can be effectively distinguished from each other, so as to correctly indicate the make-contact and break-contact states of the plug-in circuit breaker.

Specifically, as shown in <FIG> and <FIG>, the operating button 1d has the upper end as the button outer end, and the lower end as the button inner end, and the end face of the button outer end is provided with the indicating hole 12d, which is connected with the upper end of the indicator slot. The make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> are arranged side by side at the upper end of the indicating member <NUM>, the two indicator sliding stands <NUM> are arranged on both sides of the middle of the indicating member <NUM>, and the indicator tracking shaft <NUM> is arranged at the lower end of the indicating member <NUM>. As shown in <FIG>, the indicator tracking groove is formed by means of the fit between two inclined half grooves, one inclined half groove is arranged on the rear cover 1a, being the first half groove 10a, and the other inclined half groove is arranged on the base 1b, being the second half groove 10b. The upper right end of the indicator tracking groove is the first tracking groove end, and the lower left end is the second tracking groove end. When the plug-in circuit breaker is in the break-contact state, the indicator tracking shaft <NUM> is positioned at the first tracking groove end; when the plug-in circuit breaker is in the make-contact state, the indicator tracking shaft <NUM> is positioned at the second tracking groove end. As shown in <FIG>, when the plug-in circuit breaker is in the break-contact state, thus the operating button 1d is pressed down (the operating button 1d moves toward the make-contact position), as the operating button 1d moves linearly, and the indicator tracking groove is inclined from the upper right to the lower left, therefore the indicator tracking groove actuates the indicating member <NUM> to move laterally by the indicator tracking shaft <NUM> (the indicating member <NUM> moves in its entirety in the indicator slot), so as to switch from the configuration of the break-contact indicating surface <NUM> opposite to the indicating hole 12d to the configuration of the make-contact indicating surface <NUM> opposite to the indicating hole 12d. When the plug-in circuit breaker is in the make-contact state, the operating button 1d is pulled upward, thus the indicating member <NUM> goes through the process opposite to above-mentioned process.

Preferably, as shown in <FIG>, the plug-in circuit breaker of the present invention further includes a locking mechanism, wherein the locking mechanism includes the second locking member <NUM> pivotally arranged in the middle, the second locking member <NUM> includes the locking member upper end and the locking member lower end respectively arranged at both ends thereof, and the locking member lower end is provided with the second protrusion <NUM>. When the plug-in circuit breaker is in the make-contact state, the operating button 1d actuates the second locking member <NUM> to rotate by the locking member lower end, so that the second protrusion <NUM> protrudes outside the circuit breaker housing; when the plug-in circuit breaker is in the break-contact state, the operating button 1d actuates the second locking member <NUM> to rotate by the locking member upper end, so that the second protrusion <NUM> moves into the circuit breaker housing. Further, as shown in <FIG> and <FIG>, the indicating member <NUM> further includes the indicator horizontal arm <NUM> arranged at one end thereof. The second locking member <NUM> further includes the second locking member activated portion <NUM> arranged at the locking member upper end, and the operating button 1d are drivingly cooperated with the second locking member activated portion <NUM> by the indicator horizontal arm <NUM> to drive the second locking member <NUM> to rotate, so that the second protrusion <NUM> moves into the circuit breaker housing. Further, as shown in <FIG> and <FIG>, the second locking member <NUM> further includes the second locking member activated protrusion <NUM> arranged at the locking member lower end, and the second locking member activated protrusion <NUM> protrudes in the reverse direction of the second protrusion <NUM>. When the plug-in circuit breaker is in the make-contact state, the indicator horizontal arm <NUM> is positioned on one side of the second locking member activated protrusion <NUM> and in limit fit with it, so as to keep the second protrusion <NUM> protruding outside the circuit breaker housing.

Specifically, as shown in <FIG>, the indicator horizontal arm <NUM> is arranged on the lower end of the indicating member <NUM> and connected with the right angle thereof, and protrudes to the left, and the second locking member activated portion <NUM> is arranged on the upper end of the second locking member <NUM> and connected with the right angle thereof, and protrudes to the right. The second protrusion <NUM> (In <FIG>, the second protrusion <NUM> is screened by the first locking member <NUM>) and the second locking member activated protrusion <NUM> are both arranged on the lower end of the second locking member <NUM> and protrude to the left and right sides of the second locking member <NUM> respectively, and the indicator horizontal arm <NUM> is positioned on the lower side of the second locking member activated portion <NUM> and drivingly cooperated with it. As shown in <FIG>, when the plug-in circuit breaker is in the break-contact state, the operating button 1d actuates the second locking member <NUM> to rotate counterclockwise by means of the fit between the indicator horizontal arm <NUM> and the second locking member activated portion <NUM>, so that the second protrusion <NUM> moves into the circuit breaker housing. As shown in <FIG>, when the plug-in circuit breaker is in the make-contact state, the operating button 1d moves down, and the indicator horizontal arm <NUM> abuts against the second locking member activated protrusion <NUM>, so that the second locking member <NUM> rotates counterclockwise, thus the second protrusion <NUM> protrudes outside the circuit breaker housing. As the indicator horizontal arm <NUM> is positioned on the left side of the second locking member activated protrusion <NUM> and in limit fit with it, the second protrusion <NUM> keeps protruding outside the circuit breaker housing.

For the plug-in circuit breaker of the present invention, in the make-contact state, the indicator horizontal arm <NUM> of the indicating member <NUM> keeps the second protrusion <NUM> of the second locking member <NUM> protruding outside the circuit breaker housing, preventing the circuit breaker from being installed under the make-contact state and occurrence of electric shock, and facilitating improving the user's electricity safety.

It should be pointed out that the actuation of the second locking member <NUM> is not only limited to the actuation under the indicator horizontal arm <NUM>, a structure similar to the indicator horizontal arm <NUM> is but also arranged on the lower end of operating button 1d to actuate the second locking member <NUM>.

Preferably, as shown in <FIG>, <FIG>, and <FIG>, the locking mechanism further includes the first locking member <NUM>, which has one end slidably arranged inside the circuit breaker housing, and the other end being the first protrusion <NUM> protruding outside the circuit breaker housing. When the plug-in circuit breaker is assembled to a cavitated circuit breaker assembling position, the housing of the circuit breaker assembling position presses the first protrusion <NUM>, so that the first locking member <NUM> moves in its entirety to the inside of the circuit breaker housing. After the plug-in circuit breaker has been assembled to reach the designated position, the first protrusion <NUM> protrudes outside the circuit breaker housing and is in limit fit with the housing of the circuit breaker assembling position.

In the plug-in circuit breaker of the present invention, after the plug-in circuit breaker is assembled to the cavitated circuit breaker assembling position and reaches the designated position, the first locking member <NUM> is in limit fit with the housing of the circuit breaker assembling position, ensuring the assembly reliability of the plug-in circuit breaker, preventing the plug-in circuit breaker from being pulled out by mistake under the make-contact state, and improving the user's electricity safety.

Preferably, as shown in <FIG>, the locking member lower end of the second locking member <NUM> is drivingly cooperated with the first locking member <NUM>. When the plug-in circuit breaker is in a break-contact state, pulling the operating button actuates the first locking member <NUM> to move in its entirety toward the inside of the circuit breaker housing by the second locking member <NUM>, so as to release the limit fit between the first protrusion <NUM> and the housing of the circuit breaker assembling position. Further, as shown in <FIG>, the first sliding end <NUM> a further includes the first activated protrusion <NUM> and the second activated protrusion <NUM>. The second locking member <NUM> further includes the second locking member body <NUM> pivotally arranged in the middle, the second locking member activated portion <NUM> of the second locking member <NUM> is crookedly connected with one end of the second locking member body <NUM>, and the other end of the second locking member body <NUM> is provided with the second protrusion <NUM> and drivingly cooperated with the second activated protrusion <NUM>. The second locking member activated portion <NUM> and the second protrusion <NUM> protrude toward the both sides of the second locking member body <NUM>, respectively, and the second protrusion <NUM> is drivingly cooperated with the first activated protrusion <NUM>.

It should be pointed out that the first locking member <NUM> can exclude the first activated protrusion <NUM> or the second activated protrusion <NUM>, thus retain either of the two to fit with the second locking member <NUM>. Of course, such improvement will abate the stability and reliability of the action of the first locking member <NUM>.

Preferably, as shown in <FIG> and <FIG>, the first locking member <NUM> further includes the first sliding end 90a slidably arranged inside the circuit breaker housing, wherein the first sliding end 90a has one side connected with the first protrusion <NUM>, and the other side connected with the circuit breaker housing by the first locking member resetting spring 9a applying a force to the first locking member <NUM> to keep the first protrusion <NUM> protruding outside the circuit breaker housing.

Specifically, as shown in <FIG>, the upper end of the second locking member activating portion <NUM> is crookedly connected with the second locking member activated portion <NUM> (connected at a right angle or approximately at a right angle), the second protrusion <NUM> is arranged on the edge of one side edge of the lower end of the second locking member body <NUM>, and the lower end of the second locking member activating portion <NUM> and the second protrusion <NUM> are arranged on the right sides of the second activated protrusion <NUM> and the first activated protrusion <NUM>, respectively. As shown in <FIG>, when the plug-in circuit breaker is in a break-contact state, pulling up the operating button 1d actuates the second locking member <NUM> to rotate clockwise through the fit between the indicator horizontal arm <NUM> of the indicating member <NUM> and the second locking member activated portion <NUM>, thus the lower end of the second locking member activating portion <NUM> actuates the first locking member <NUM> to move to the left (move into the breaker housing) by the second activated protrusion <NUM>, so does the second protrusion <NUM> by the first activated protrusion <NUM>, so as to release the first protrusion <NUM> of the first locking member <NUM> from the limit fit with the housing of the circuit breaker assembling position.

Preferably, as shown in <FIG>, the circuit breaker housing is provided with the first opening <NUM> a fitting with the first protrusion <NUM> and the second protrusion <NUM>. Specifically, as shown in <FIG>, the first opening 11a is arranged on the right side of the circuit breaker housing, and the first protrusion <NUM> and the second protrusion <NUM> protrude outside the circuit breaker housing through the first opening 11a, respectively.

As shown in <FIG>, there is an embodiment of the locking mechanism in the plug-in circuit breaker of the present invention.

As shown in <FIG> and <FIG>, the locking mechanism includes the first locking member <NUM>, the second locking member <NUM> and the indicating member <NUM>. The indicating member <NUM> has one end inserted into the operating button 1d, and the other end drivingly cooperated with the second locking member <NUM>, and the second locking member <NUM> has the middle pivotally arranged, and one end drivingly cooperated with the first locking member <NUM>.

Preferably, as shown in <FIG>,<FIG>, <FIG>, the first locking member <NUM> further includes the first sliding end 90a and the first protrusion <NUM> respectively arranged both end thereof, wherein the first sliding end 90a has one side connected with the first protrusion <NUM>, and the other side connected with the circuit breaker housing by the first locking member resetting spring 9a. Further, as shown in <FIG>, the first sliding end 90a includes the spring-limiting groove <NUM> arranged on one side thereof, and a spring-limiting protrusion is also arranged in the middle of the spring-limiting groove <NUM>. One end of the first locking member resetting spring 9a is inserted into the spring-limiting groove <NUM>, and encircles the spring-limiting protrusion. Further, as shown in <FIG>, one end of the first sliding end 90a is provided with the first tracking groove <NUM> fitting with the first sliding track on the circuit breaker housing to define a sliding path of the first sliding end 90a. Further, as shown in <FIG>, the first sliding end 90a further includes the first activated protrusion <NUM> and the second activated protrusion <NUM>, wherein the first activated protrusion <NUM> and the first tracking groove <NUM> are respectively arranged at both ends of the first sliding end 90a, and the second activated protrusion <NUM> are arranged on the upper side of the first sliding end 90a and positioned between the first activated protrusion <NUM> and the first tracking groove <NUM>.

Preferably, as shown in <FIG>, <FIG> and <FIG>, the second locking member <NUM> includes the second locking member activated portion <NUM>, the second locking member body <NUM>, the second locking member activated protrusion <NUM>, the second locking member activated protrusion <NUM> and the second protrusions <NUM>. The second locking member body <NUM> has the middle part pivotally arranged on the circuit breaker housing by the second locking member mounting shaft <NUM>, one end crookedly connected with the second locking member activated portion <NUM>, and the other end provided with the second locking member activated protrusion <NUM> and the second protrusions <NUM>. The second locking member activated portion <NUM> and the second protrusion <NUM> protrude toward both sides of the second locking member body <NUM>, respectively, and the second locking member activated portion <NUM> and the second locking member activated protrusion <NUM> both protrude on the identical side of the second locking member body <NUM>.

Specifically, as shown in <FIG> and <FIG>, the second locking member <NUM> includes a locking member upper end and a locking member lower end respectively arranged on the upper and lower ends thereof, and the second locking member activated portion <NUM> is crookedly connected with the second locking member body <NUM> (connected at a right angle or approximately at a right angle) to form the locking member upper end; the second locking member activated protrusion <NUM> and the second protrusions <NUM> are both arranged on the lower end of the second locking member body <NUM>, thus the second protrusion <NUM> and the lower end of the second locking member body <NUM> form the locking member lower end. The middle of the second locking member body <NUM> is provided with the second locking member mounting shaft <NUM>, both ends of which are pivotally connected to the circuit breaker housing, respectively. The lower end of the second locking member body <NUM> is drivingly cooperated with the second activated protrusion <NUM>, and the second locking member activated protrusion <NUM> is arranged at the edge of one side of the lower end of the second locking member body <NUM>(as shown in <FIG>, the second locking member activated protrusion <NUM> is arranged at the edge of the left side of the lower end of the second locking member body <NUM>). The second protrusion <NUM> protrudes below the lower end of the second locking member body <NUM> and is connected with the second locking member activated protrusion <NUM> (As shown in <FIG>, the second locking member activated portion <NUM> and the second locking member body <NUM> integrally form a L-shaped structure, and the second locking member activated protrusion <NUM> and the second protrusion <NUM> are an integral plate structure, and positioned in their entirety on the left side of the above-mentioned L-shaped structure, and the upper end is the second locking member activated protrusion <NUM> connected with the lower end of the second locking member body <NUM>, and the lower end is the second protrusion <NUM> protruding below the lower end of the second locking member body <NUM>. The second locking member activated portion <NUM> and the second protrusion <NUM> protrude toward both sides of the second locking member body <NUM>, respectively, the second locking member activated portion <NUM> and the second locking member activated protrusion <NUM> protrude toward the identical side of the second locking member body <NUM>, and the second protrusion <NUM> is drivingly cooperated with the first activated protrusion <NUM>.

Preferably, as shown in <FIG> and <FIG>, the indicating member <NUM> includes the indicator body <NUM>-<NUM>, the indicator horizontal arm <NUM>, the indicator tracking shaft <NUM>, the indicator sliding stand <NUM>, the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM>. The indicator horizontal arm <NUM> is arranged on one end of the indicator body <NUM>-<NUM> and crookedly connected with the indicator body <NUM>-<NUM>, the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> are arranged side by side on the other end of the indicator body <NUM>-<NUM>, two indicator sliding stands <NUM> are respectively arranged on both sides of the middle part of the indicator body <NUM>-<NUM>. Further, as shown in <FIG>, the indicating member <NUM> further includes the indicator vertical arm <NUM>, wherein the indicator vertical arm <NUM> and the indicator horizontal arm <NUM> are arranged on the identical end of the indicator body <NUM>, both have a L-shaped structure in their entirety, thus the indicator vertical arm <NUM> helps to improve the structural strength of the indicator horizontal arm <NUM>.

Specifically, as shown in <FIG> and <FIG>, the make-contact indicating surface <NUM> and the break-contact indicating surface <NUM> are arranged side by side on the upper end surface of the indicator body <NUM>-<NUM>. The indicator horizontal arm <NUM>, the indicator tracking shaft <NUM> and the indicator vertical arm <NUM> are all arranged on the lower end surface of the indicator body <NUM>-<NUM>. The indicator horizontal arm <NUM> and the indicator vertical arm <NUM> are arranged on the identical side of the indicator body <NUM>-<NUM> in a L-shaped structure as a whole, and the indicator tracking shaft <NUM> is arranged on the other side of the indicator body <NUM>-<NUM>. Two indicator sliding stands <NUM> are respectively arranged on the middle parts of both sides of the indicator body <NUM>-<NUM>, and both positioned between the break-contact indicating surface <NUM> and the indicator horizontal arm <NUM>.

As shown in <FIG>, the circuit breaker housing is provided with an indicator tracking groove fitting with the indicator tracking shaft <NUM>. The indicator tracking groove is obliquely arranged as an tracking groove inclined from the upper right end to the lower left end. Further, as shown in <FIG>, the indicator tracking groove includes a first vertical groove, an inclined groove and a second vertical groove, wherein the lower end of the first vertical groove is connected with the upper right end of the inclined groove, the upper end of the second vertical groove is connected with the lower left end of the inclined groove, and the lower end of the first vertical groove is higher than the upper end of the second vertical groove. Further, as shown in <FIG>, the indicator tracking groove is composed of two inclined half-grooves fitting with each other, in particular, one inclined half-groove is arranged on the rear cover 1a, and the other inclined half-groove is arranged on the base 1b.

Preferably, as shown in <FIG>, the operating button 1d includes the button body 10d and the button cap arranged at one end of the button body 10d, wherein the middle of the button cap is provided with the indicating hole 12d, the middle of the other end of the button body 10d is provided with the indicator slot, two side walls of the indicator slot are respectively provided with one indicator groove 100d. Further, as shown in <FIG>, the operating button 1d further includes the button connecting stand 11d rotatably connected to one end of the U-shaped connecting rod <NUM>.

We will described the operating principle of the locking mechanism in combination with <FIG> as follows:
As shown in <FIG>, when the plug-in circuit breaker is in a break-contact state, the operating button 1d actuates the second locking member <NUM> to rotate clockwise through the fit between the indicator horizontal arm <NUM> of the indicating member <NUM> and the second locking member activated portion <NUM> of the second locking member <NUM>, thus the second protrusion <NUM> of the second locking member <NUM> is moved inside the circuit breaker housing, in this state (break-contact), the plug-in circuit breaker can be installed into the circuit breaker assembling position (eg, a cabinet). As shown in <FIG>, when the plug-in circuit breaker is in a break-contact state, continuing to pull the operating button 1d actuates the second locking member <NUM> to continue to rotate clockwise through the fit between the indicator horizontal arm <NUM> of the indicating member <NUM> and the second locking member activated portion <NUM> of the second locking member <NUM>, so that the lower end of the second locking member body <NUM> and the second protrusion <NUM> of the second locking member <NUM> drive the second activated protrusion <NUM> and the first activated protrusion <NUM>, respectively, so as to move the first protrusion <NUM> of the first locking member <NUM> inside the circuit breaker housing, thereby releasing the limit fit between the plug-in circuit breaker and the housing of the circuit breaker assembling position and ensuring the plug-in circuit breaker to be disassembled from the circuit breaker assembling position. As shown in <FIG>, when the plug-in circuit breaker is in the make-contact state, the operating button 1d drives the indicator horizontal arm <NUM> to move down, thus the indicator horizontal arm <NUM> drives the second locking member <NUM> to rotate counterclockwise by the second locking member activated protrusion <NUM>, so that the second protrusion <NUM> protrudes outside the circuit breaker housing, in this state (make-contact), the second protrusion <NUM> protrudes outside the circuit breaker housing. As the second locking member activated protrusion <NUM> is confined by the indicator horizontal arm <NUM>, the second protrusion <NUM> cannot be pressed into the circuit breaker housing, so when the plug-in circuit breaker is in the make-contact state, it cannot be assembled to the circuit breaker assembling position. When the plug-in circuit breaker is switched between the break-contact state and the make-contact state, due to the fit between the indicator tracking shaft <NUM> and the indicator tracking groove, the indicating member <NUM> will also move back and forth in the indicator slot of the operating button 1d. Thus, when the plug-in circuit breaker is in the make-contact state, the make-contact indicating surface <NUM> is opposite to the indicating hole 12d (preferably, the indicator tracking shaft <NUM> is positioned at the connection between the second vertical groove and the inclined groove); when the plug-in circuit breaker is in the break-contact state, the break-contact indicating surface <NUM> is opposite to the indicating hole 12d (preferably, at this time, the indicator tracking shaft <NUM> is positioned at the connection between the first vertical groove and the inclined groove, and if the operating button 1d is continuously pulled, the indicator tracking shaft <NUM> slides along the first vertical groove to the second locking member <NUM>, so as to actuate the first locking member <NUM> to release the limit fit with the housing of the circuit breaker assembling position).

The present invention also relates to a connecting terminal.

As shown in <FIG>, there is an embodiment of the connecting terminal of the present invention.

The connecting terminal of the present invention includes the connecting screw 2e, the wire-clamping piece <NUM>, the nut piece 2f and the connecting board 2j; the connecting screw 2e and the nut piece 2f are threadedly connected with each other; the wire-clamping piece <NUM> is arranged between the nut piece 2f and the nut of the connecting screw, and obliquely arranged with respect to the connecting board 2j, which is fixedly arranged. The wire-clamping piece <NUM> has one end confined, and the other end configured to from a space for connecting wires with respect to the connecting board 2j. During inserting wires between the wire-clamping piece <NUM> and the connecting board 2j, screwing the connecting screw 2e and moving the nut piece 2f in the axial direction of the connecting screw 2e, the nut piece 2f actuates the end of the wire-clamping piece <NUM> fitting with the connecting board 2j to rise, so as to press the wires between the wire-clamping piece <NUM> and the connecting board 2j. Further, the nut piece 2f is in limit fit with the terminal assembling cavity receiving the connecting terminal, preventing the nut piece 2f from rotating and enabling it to move in axial direction of the connecting screw 2e, thus during screwing the connecting screw 2e, the nut piece 2f reciprocates in the axial direction of the connecting screw 2e.

Specifically, as shown in <FIG>, the wire-clamping piece <NUM> has the left end confined, the right end arranged opposite to and fitting with the connecting board 2j, the wire-clamping piece <NUM> is gradually inclined downward from the left end to the right end with its left end higher than its right end. During screwing the connecting screw 2e, moving up the nut piece 2f in axial direction of the connecting screw 2e, the nut piece 2f actuates the right end of the wire-clamping piece <NUM> to gradually rise, so as to press wires between the wire-clamping piece <NUM> and the connecting board 2j. Of course, when required to remove the wires, the connecting screw 2e needs to be screwed, so that the nut piece 2f moves down in axial direction of the connecting screw 2e, thus reducing the pressure between the wire-clamping piece <NUM> and the wires helps to better remove the wires.

Preferably, as shown in <FIG>, one side of the connecting board 2j facing the wire-clamping piece <NUM> is provided with a plurality of lateral grooves or lateral ribs arranged side by side, and the extension direction of the lateral grooves or lateral ribs is perpendicular to the insertion direction of the wires.

In the connecting terminal of the present invention, the pressure applied by the wire-clamping piece <NUM> on the wires between the wire-clamping piece <NUM> and the connecting board 2j mainly includes the pressure generated by the deformation of the wire-clamping piece <NUM> itself and the pressure applied by the nut piece 2f on the wires via the wire-clamping piece <NUM>. Compared with the existing connecting terminal that only hinges on the wire-clamping piece <NUM> to press the wire, such connecting wires is more reliable.

It should be pointed out that, in the connecting terminal of this embodiment, the nut piece 2f may not be in limit fit with the terminal assembling cavity receiving the connecting terminal, only hinging on the friction force generated by the contact between the nut piece 2f and the wire-clamping piece <NUM>, so as to limit the rotation of the nut piece 2f with the connecting screw 2e. In addition, as the nut piece 2f is a special-shaped part with its gravity center positioned at one end of the nut piece 2f not coinciding with the axis of the connecting screw 2e, an eccentric force is generated to restrict the nut piece 2f from rotating with the connecting screw 2e. In addition, for the connecting terminal of this embodiment, the nut piece 2f and the connection screw 2e may also be fixedly connected (instead of thread connection) with each other, and the connecting screw 2e is in thread fit with the housing of the terminal assembling cavity. During screwing the connecting screw 2e and moving the connecting screw 2e with respect to the terminal assembling cavity, the nut piece 2e is actuated to move, equally actuating the wire-clamping piece <NUM>.

As shown in <FIG>, there is the first embodiment of the connecting terminal of the present invention.

The connecting terminal of the present invention includes the connecting screw 2e, the wire-clamping piece <NUM>, the nut piece 2f, the connecting board 2j, the clamping piece-mounting shaft <NUM> and the clamping piece-resetting spring 2i; the connecting screw 2e and the nut piece 2f are threadedly connected with each other; the nut piece 2f is in limit fit with the terminal assembling cavity receiving the connecting terminal, preventing the nut piece 2f from rotating, thus during screwing the connecting screw 2e, the nut piece 2f reciprocates in the axial direction of the connecting screw 2e; the wire-clamping piece <NUM> is arranged between the nut piece 2f and the nut of the connecting screw, and obliquely arranged with respect to the connecting board 2j, which is fixedly arranged. The wire-clamping piece <NUM> has one end provided with the clamping piece shaft sleeve <NUM>, and the other end arranged opposite to and fitting with the connecting board 2j. The clamping piece shaft sleeve <NUM> encircles the clamping piece-mounting shaft <NUM>, both ends of which are respectively fixed on the cavity wall of the terminal assembling cavity. The clamping piece-resetting spring 2i encircles the clamping piece-mounting shaft <NUM>, and has one end connected with the cavity wall of the terminal assembling cavity, and other end connected with the wire-clamping piece <NUM>. In the connecting terminal of this embodiment, the clamping piece-resetting spring 2i can actuate the turnup end of the wire-clamping piece <NUM> to fall while the nut piece 2f moves down, improving the efficiency and convenience of wire removal.

Specifically, as shown in <FIG>, the wire-clamping piece <NUM> has the left end provided with the clamping piece shaft sleeve <NUM>, and the right end arranged opposite to and fitting with the connecting board 2j, the wire-clamping piece <NUM> is gradually inclined downward from the left end to the right end with its left end higher than its right end. As shown in <FIG>, the gap between the right end of the wire-clamping piece <NUM> and the connecting board 2j is the largest, thus wires can be inserted between the wire-clamping piece <NUM> and the connecting board 2j, then screwing the connecting screw 2e enables the nut piece 2f to moves up in axial direction of the connecting screw 2e. During gradually raising the right end of the wire-clamping piece <NUM> with gradual reduction of the gap between the right end of the wire-clamping piece <NUM> and the connecting board 2j, the wires are pressed tightly. As shown in <FIG>, the gap between the right end of the wire-clamping piece <NUM> and the connecting board 2j is the smallest, even almost zero.

Preferably, as shown in <FIG>, the wire-clamping piece <NUM> includes the wire-clamping piece sleeve <NUM>, the first connecting portion <NUM> and the first wire-clamping portion <NUM>, wherein the first connecting portion <NUM> has one end connected with the wire-clamping piece sleeve <NUM>, and the other end crookedly connected with one end of the first wire-clamping portion <NUM>, and the other end of the first wire-clamping portion <NUM> fits with the connecting board 2j. Specifically, as shown in <FIG>, the first connecting portion <NUM> has the left end connected with the wire-clamping piece sleeve <NUM>, and the right end crookedly connected with the left end of the first wire-clamping portion <NUM>, and the right end of the first wire-clamping portion <NUM> is arranged opposite to and fits with the connecting board 2j. Further, as shown in <FIG>, the wire-clamping piece <NUM> has a L-shaped structure as a whole, the width of the first wire-clamping portion <NUM> is greater than the width of the first connecting portion <NUM>, and the length of the wire-clamping piece sleeve <NUM> is equal to the width of the first connecting portion <NUM>. The connecting screw 2e is arranged at the notch of the L-shaped structure of the wire-clamping piece <NUM>.

Preferably, as shown in <FIG>, the nut piece 2f includes the first nut portion 20f threadedly connected with the connecting screw 2e, and the second nut portion 21f crookedly connected with one end of the first nut portion 20f, wherein the first nut portion 20f is arranged opposite to and fits with the first connecting portion <NUM>, and the second nut portion 21f is arranged opposite to and fits with the first wire-clamping portion <NUM>. Specifically, as shown in <FIG>, in the initial state, the second nut portion 21f is contiguously connected with the first wire-clamping portion <NUM> (both are substantially parallel to each other), and the right end of the first nut portion 20f is contiguously connected with the right end of the first connecting portion <NUM>. As shown in <FIG>, after screwing the connecting screw 2e, the second nut portion 21f actuates the first wire-clamping portion <NUM> to gradually rise, meanwhile the second nut portion 21f is gradually separated from the first wire-clamping portion <NUM>, then coordinating the first nut portion 20f with the first connecting portion <NUM> actuates the first wire-clamping portion <NUM> to continue to rise.

Preferably, as shown in <FIG>, the included angle α between the first connecting portion <NUM> and the first wire-clamping portion <NUM> is greater than the included angle β between the first nut portion 20f and the second nut portion 21f.

As shown in <FIG>, there is the second embodiment of the connecting terminal of the present invention.

The connecting terminal of the present invention includes the connecting screw 2e, the wire-clamping piece <NUM>, the nut piece 2f and the connecting board 2j; the connecting screw 2e and the nut piece 2f are threadedly connected with each other; the nut piece 2f is in limit fit with the terminal assembling cavity receiving the connecting terminal, preventing the nut piece 2f from rotating, thus during screwing the connecting screw 2e, the nut piece 2f reciprocates in the axial direction of the connecting screw 2e; the wire-clamping piece <NUM> is arranged between the nut piece 2f and the nut of the connecting screw, and obliquely arranged with respect to the connecting board 2j, which is fixedly arranged. The wire-clamping piece <NUM> has one end confined, and the other end arranged opposite to and fitting with the connecting board 2j. During inserting wires between the wire-clamping piece <NUM> and the connecting board 2j, screwing the connecting screw 2e and moving the nut piece 2f in the axial direction of the connecting screw 2e, the nut piece 2f actuates the end of the wire-clamping piece <NUM> fitting with the connecting board 2j to rise, so as to press the wires between the wire-clamping piece <NUM> and the connecting board 2j.

Preferably, as shown in <FIG>, the wire-clamping piece <NUM> includes the first wire-clamping portion <NUM>, the second wire-clamping portion <NUM> and the third wire-clamping portion <NUM>. The first wire-clamping portion <NUM> encircles the connecting screw 2e through the first opening arranged on it. The second wire-clamping portion <NUM> is provided with the second opening, through which the second wire-clamping portion <NUM> encircles the connecting screw 2e. One end of the first wire-clamping portion <NUM> is crookedly connected with one end of the second wire-clamping portion <NUM>; the other end of the second wire-clamping portion <NUM> is crookedly connected with one end of the third wire-clamping portion <NUM>; the other end of the third wire-clamping portion <NUM> fits with the connecting board 2j; the second wire-clamping portion <NUM> and the third wire-clamping portion <NUM> are integrally arranged obliquely with respect to the connecting board 2j. The nut piece 2f includes the first nut portion 20f threadedly connected with the connecting screw 2e, and the second nut portion 21f crookedly connected with one end of the first nut portion 20f, wherein the first nut portion 20f is arranged opposite to and fits with the second wire-clamping portion <NUM>, and the second nut portion 21f is arranged opposite to and fits with the third wire-clamping portion <NUM>. Further, as shown in <FIG>, the connection between the first wire-clamping portion <NUM> and the second wire-clamping portion <NUM> is an arc structure, and the included angle α1 between the second wire-clamping portion <NUM> and the third wire-clamping portion <NUM> is greater than the included angle β between the first nut portion 20f and the second nut portion 21f.

Specifically, as shown in <FIG>, the first wire-clamping portion <NUM> and the second wire-clamping portion <NUM> are sequentially arranged between the nut of the connecting screw 2e and the nut piece 2f. The left end of the third wire-clamping portion <NUM> is crookedly connected with the right end of the second wire-clamping portion <NUM>, and the right end of the third wire-clamping portion <NUM> is arranged opposite to and fits with the connecting board 2j. As shown in <FIG>, there is no or weak interaction force between the nut of the connecting screw 2e and the first wire-clamping portion <NUM>, and between the third wire-clamping portion <NUM> and the second nut portion 21f. As shown in <FIG>, there is strong interaction force between the nut of the connecting screw 2e and the first wire-clamping portion <NUM>, and between the third wire-clamping portion <NUM> and the second nut portion 21f(because the connection between the first wire-clamping portion <NUM> and the second wire-clamping portion <NUM> is compressed). Screwing the connecting screw 2e to move the nut piece 2f downwards enables the connection between the first wire-clamping portion <NUM> and the second wire-clamping portion <NUM> in the compressed state to gradually relax, so that the third wire-clamping portion <NUM> gradually moves down, facilitating the wire removal of the connecting terminal.

As shown in <FIG>, there is another embodiment of the connecting terminal of the present invention.

The connecting terminal of the present invention includes the connecting screw 2e, the wire-clamping piece <NUM>, the clamping piece-mounting shaft <NUM>, the nut piece 2f and the connecting board 2j; the connecting screw 2e and the nut piece 2f are threadedly connected with each other; the wire-clamping piece <NUM> includes the upper wire-clamping piece 2g1 and the lower wire-clamping piece 2g2 arranged opposite to each other; the upper wire-clamping piece 2g1 and the lower wire-clamping piece 2g2 are obliquely arranged with respect to the connecting board 2j; the connection between one end of the upper wire-clamping piece 2g1 and one end of the lower wire-clamping piece 2g2 encircles the clamping piece-mounting shaft <NUM>; the free end of the upper wire-clamping piece 2g1 and the free end of the lower wire-clamping piece 2g2 are both arranged opposite to and fits with the connecting board 2j. During inserting wires between the wire-clamping piece <NUM> and the connecting board 2j, screwing the connecting screw 2e and moving the nut piece 2f in the axial direction of the connecting screw 2e, the nut piece 2f actuates the end of the wire-clamping piece <NUM> fitting with the connecting board 2j to rise, so as to press the wires between the wire-clamping piece <NUM> and the connecting board 2j. Further, the wire-clamping piece <NUM> is in limit fit with the connecting screw 2e to prevent the connecting screw 2e from moving away from the connecting board 2j. Further, the nut piece 2f is limited to prevent itself from rotating, and screwing the connecting screw 2e actuates the nut piece 2f to move back and forth in the axial direction of the connecting screw 2e.

Preferably, as shown in <FIG> and <FIG>, the upper wire-clamping piece 2g1 and the lower wire-clamping piece 2g2 both have a L-shaped structure, wherein the upper wire-clamping piece 2g1 includes the upper connecting portion 2g11 and the upper wire-clamping portion 2g10, the upper wire-clamping portion 2g10 includes a first wire-clamping end and a first connecting end arranged at both ends thereof, the first wire-clamping end is arranged opposite to and fits with the connecting board 2j, the first connecting end is connected with one end of the upper connecting portion 2g11, the width of the first connecting end is greater than the width of the upper connecting portion 2g11; the lower wire-clamping piece 2g2 includes the lower connecting portion 2g21 and the lower wire-clamping portion 2g20, the lower wire-clamping portion 2g20 includes a second wire-clamping end and a second connecting end arranged at both ends thereof, the second wire-clamping end is arranged opposite to and fits with the connecting board 2j, the second connecting end is connected with one end of the lower connecting portion 2g21, the width of the second connecting end is greater than the width of the lower connecting portion 2g21, the other end of the lower connecting portion 2g21 is connected with the other end of the upper connecting portion 2g11; the first wire-clamping end protrudes from the second wire-clamping end in the diection of the connecting board 2j, and the second connecting end protrudes from the first connecting end in the direction of the connecting screw 2e.

Specifically, as shown in <FIG>, the right end of the upper wire-clamping portion 2g10 and the right end of the lower wire-clamping portion 2g20 are arranged opposite to and fit with the connecting board 2j, respectively, the right end of the lower wire-clamping portion 2g20 protrudes from the right end of the upper wire-clamping portion 2g10 in the direction (to the right side) of the connecting board 2j, and the left end of the lower wire-clamping portion 2g20 protrudes from the left end of the upper wire-clamping portion 2g10 in the direction (to the left side) of the connecting board 2j. The connecting screw 2e is arranged between the clamping piece-mounting shaft <NUM> and the upper wire-clamping portion 2g10 (and is positioned between the clamping piece-mounting shaft <NUM> and the lower wire-clamping portion 2g20). The connecting screw 2e is screwed to move upwards the nut piece 2f, meanwhile the rights end of the lower wire-clamping portion 2g20 and the upper wire-clamping portion 2g10 are actuated to rise to press the wires. If the outer diameter of the wires is relatively thin, only the lower wire-clamping portion 2g20 can press the wires tightly, and if the outer diameter of the wires is large, the lower wire-clamping portion 2g20 in coordination with the upper wire-clamping portion 2g10 can press the wires tightly, thereby improving the connection reliability of the connecting terminal of the invention, and enabling the connecting terminal to be suitable for the connection operation of the wires with various external diameters.

Preferably, as shown in <FIG>, the lower wire-clamping piece 2g2 further includes the disconnecting elastic piece 2g22 arranged at the middle of the lower wire-clamping portion 2g20, the disconnecting elastic piece 2g22 has one end connected with the lower wire-clamping portion 2g20, and the other end arranged opposite to and fitting with the upper wire-clamping portion 2g10. Further, as shown in <FIG>,the included angle γ between the disconnecting elastic piece 2g22 and the lower wire-clamping portion 2g20 is less than <NUM>°. When there is a need to disconnect the wires from the wiring terminal of the present invention, the connecting screw 2e is screwed to move downwards the nut piece 2f, thus the disconnecting elastic piece 2g22 can provide an elastic force to release the wires from the lower wire-clamping portion 2g20, thereby improving the convenience and efficiency of disconnection.

Preferably, as shown in <FIG>, <FIG> and <FIG>, the connecting terminal of the present invention further includes two fixing plates <NUM> arranged opposite to each other, between which the connecting screw 2e, the nut piece 2f, the wire-clamping piece <NUM> and the connecting board 2j are all arranged, and which confine the nut piece 2f, preventing the nut piece 2f from rotating, and the two ends of the clamping piece-mounting shaft <NUM> are connected with the two fixing plates <NUM>, respectively. Further, as shown in <FIG> and <FIG>, the fixing plate <NUM> is provided with the nut sliding groove 2k1, and each end of the nut piece 2f is provided with one nut sliding stand 22f, which is slidably arranged inside the two nut sliding grooves 2k1, respectively. Further, as shown in <FIG>, the fixing plates <NUM> is further provided with the connecting board limiting hole 2k3, and one connecting board limiting stand 2j0 is arranged along each edge in pair of the connecting board 2j, thus two connecting board limiting stand 2j0 are respectively arranged inside two connecting board limiting hole 2k3.

As shown in <FIG> and <FIG>, two ends of the clamping piece-mounting shaft <NUM> are respectively connected with the upper portions of one end of two fixing plates <NUM>, in particular, the two ends of the clamping piece-mounting shaft <NUM> are respectively connected with the upper left corner of the two fixing plates <NUM>. The connecting board 2j is arranged between the other ends of the two fixing plates <NUM>, in particular, and two ends of the connecting board 2j are respectively connected with the right ends of the two fixing plates <NUM>. The wire-clamping piece <NUM> has one end connected with the clamping piece-mounting shaft <NUM>, and the other end arranged opposite to and fitting with the connecting board 2j, and the wire-clamping piece <NUM> is inclined downwards from one end connected with the clamping piece-mounting shaft <NUM> to the other end, in particular the wire-clamping piece <NUM> is gradually inclined downwards from the left end to the right end. The wire-clamping piece <NUM> is integrally formed into a L-shaped structure, and the connecting screw 2e is arranged at the notch of the L-shaped structure of the wire-clamping piece <NUM> and in threaded fit with the nut piece 2f arranged under the wire-clamping piece <NUM>, in particular, the connecting screw 2e is arranged on the front side of the upper connecting portion 2g11 (the lower connecting portion 2g21) and positioned at the left side of the upper wire-clamping portion 2g10 (the lower wire-clamping portion 2g20).

Preferably, one side of the connecting board 2j facing the wire-clamping piece <NUM> is provided with a plurality of lateral grooves or lateral ribs arranged side by side, and the extension direction of the lateral grooves or lateral ribs is perpendicular to the insertion direction of the wires.

Claim 1:
A plug-in circuit breaker comprising a circuit breaker housing and at least one protective pole, said circuit breaker housing being providing with at least one protective pole-mounting cavity, wherein each protective pole includes the operating button (1d), an operating mechanism (<NUM>) arranged inside said protective pole-mounting cavity and drivingly connected with said operating button (1d), a protecting mechanism (<NUM>) drivingly cooperated with said operating mechanism (<NUM>), an arc extinguishing system (<NUM>), a first wire-inlet terminal (<NUM>), a first wire-outlet terminal (<NUM>), a movable contact (<NUM>) connected with said operating mechanism (<NUM>), and a stationary contact (<NUM>) fitting with said movable contact (<NUM>);
wherein one end of said operating button (1d) is inserted into the circuit breaker housing, at one end of which said operating button (1d) and said first wire-outlet terminal (<NUM>) are both arranged, and at the other end of which said first wire-inlet terminal (<NUM>) is arranged, said arc extinguishing system (<NUM>) is arranged in the middle of said protective pole-mounting cavity, said operating mechanism (<NUM>) is arranged between said operating button (1d) and said arc extinguishing system (<NUM>), and said protecting mechanism (<NUM>) is arranged between said first wire-outlet terminal (<NUM>) and said arc extinguishing system (<NUM>) and positioned on one side of said operating mechanism (<NUM>);
wherein in the case that the plug-in circuit breaker is in a make-contact state, and said operating mechanism (<NUM>) is in a locking state, while a short-circuit fault and an overload fault occurs, said protecting mechanism (<NUM>) actuates said operating mechanism (<NUM>) to trip off; said protecting mechanism (<NUM>) includes a magnetic yoke (<NUM>) and a dual metal piece (<NUM>), and said operating mechanism (<NUM>) includes a jump buckle (<NUM>) and a lock catch (<NUM>); when a short-circuit fault occurs, said lock catch (<NUM>) is attracted to swing toward said magnetic yoke (<NUM>), releasing the interlock with said jump buckle (<NUM>); when an overload fault occurs, said dual metal piece (<NUM>) bends and actuates said lock catch (<NUM>) to swing toward said magnetic yoke (<NUM>), releasing the interlock with said jump buckle (<NUM>).