Patent Description:
Circuit breakers have been widely used with effective improvement for safely using appliances, accordingly, also shall continuously upgrade and improve in their overall structure and operation mode, adapting themselves to the development trend in the miniaturization of appliances. After full investigation and research on the prior arts, we have found that the existing circuit breakers have the following deficiencies.

China patent application <CIT> discloses a circuit breaker, wherein a locking protrusion <NUM> of a locking member <NUM> protrudes out from a first hole <NUM>, pulling a button <NUM> used for switching on/off the circuit breaker drives the locking member <NUM> to move inward the housing <NUM>, thus enabling the locking protrusion <NUM> to retract into the housing <NUM>.

The present invention aims to overcome the defects of the prior art, and provide a plug-in circuit breaker, which includes an unlocking mechanism independent of a button mechanism, so as to avoid the circuit breaker from being mistakenly pulled out from the assembling position of the circuit breaker due to a switch-off operation.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:.

Preferably, the unlocking mechanism further includes a linkage member 3a, one end of which is drivingly co-operated with the first locking member 1a, and the other end of which is drivingly co-operated with the pulling member 2a, pulling the pulling member 2a enables the linkage member 3a to rotate, so as to drive the first locking member 1a to retract into the inside of the circuit breaker housing <NUM>.

Preferably, the pulling member 2a includes a pulling member operating portion 20a, a pulling member's first transition portion 21a and a pulling member driving portion 24a; the pulling member operating portion 20a is vertically connected to the pulling member's first transition portion 21a, the pulling member's first transition portion 21a is parallel to the movement direction of the pulling member 2a, and the pulling member driving portion 24a is obliquely connected to the pulling member's first transition portion 21a, which is used to drive the first locking member 1a.

Preferably, the pulling member 2a further includes a pulling member's second transition portion 22a connected between the pulling member's first transition portion 21a and the pulling member driving portion 24a, the pulling member's second transition portion 22a is parallel to the pulling member operating portion 20a and perpendicular to the pulling member's first transition portion 21a, the pulling member's second transition portion 22a and the pulling member operating portion 20a are both positioned on one side of the pulling member's first transition portion 21a, and the pulling member driving portion 24a extends in a direction far away from the pulling member operating portion 20a and bends toward a side at which the pulling member's first transition portion 21a is position;
the circuit breaker housing <NUM> further includes a pulling member limiting rib 6a arranged between the pulling member operating portion 20a and the pulling member's second transition portion 22a, pulling the pulling member 2a enables the first locking member 1a to retract into the inside of the circuit breaker housing <NUM>, so as to release the position-limiting cooperation between the locking member 1a and the assembling position housing, afterward continuing to pull the pulling member 2a enables its position-limiting cooperation with the pulling member limiting rib 6a, and the circuit breaker is pulled out from the assembling position of the circuit breaker.

Preferably, the pulling member 2a further includes a pulling member's third transition portion 23a arranged between the pulling member's second transition portion 22a and the pulling member driving portion 24a, the pulling member's third transition portion 23a is parallel to the pulling member's first transition portion 21a; and/or, the pulling member 2a further includes a pulling member maintaining portion 25a connected with the pulling member driving portion 24a, the pulling member maintaining portion 25a is parallel to the pulling member's first transition portion 21a, the pulling member driving portion 24a is inclined and pulling said pulling member driving portion 24a enables the linkage member 3a to gradually be driven, said linkage member 3a drives said first locking member 1a to retract into the inside of the circuit breaker housing <NUM>, afterward the pulling member maintaining portion 25a enables the first locking member 1a to remain at the retraction position by means of the linkage member 3a.

Preferably, the unlocking mechanism further includes a pulling member maintaining magnet arranged in the circuit breaker housing <NUM> and co-operated with the pulling member operating portion 20a, which is made of metal magnetic material and magnetically co-operated with the pulling member maintaining magnet.

Preferably, the button mechanism <NUM> includes a switch-on button <NUM> and a switch-off button <NUM> slidably arranged inside the circuit breaker housing <NUM>, respectively, pressing the switch-on button <NUM> enables the operating mechanism to dive the circuit breaker to switch on, meanwhile enables the switch-off button <NUM> to move toward the outside of the circuit breaker housing <NUM>; pressing the switch-off button <NUM> enables the operating mechanism to drive the circuit breaker to switch off, meanwhile enables the switch-on button <NUM> to move toward the outside of the circuit breaker housing <NUM>; the pulling member 2a is arranged with the switch-on button <NUM> and the switch-off button <NUM> in overlap in the thickness direction of the circuit breaker, the movement direction of the pulling member 2a is parallel to the movement of the switch-on button <NUM> and the switch-off button <NUM> and perpendicular to the movement direction of the first locking member 1a, and the first locking member 1a moves in the width direction of the circuit breaker.

Preferably, the circuit breaker housing <NUM> is shaped as a hexahedral structure in its entirety, including a front side wall <NUM> and a rear side wall <NUM> arranged oppositely, wire-outlet holes <NUM>, button holes <NUM>-<NUM> and a pulling member operating hole <NUM> all arranged on the front side wall <NUM>, and wire-inlet holes <NUM> arranged on the rear side wall <NUM>.

Preferably, the button holes <NUM>-<NUM> include a switch-on button hole <NUM> and a switch-off button hole <NUM> arranged side by side.

Preferably, the circuit breaker housing <NUM> further includes a pulling member' dig slot <NUM> arranged on the front side wall <NUM>, the pulling member' dig slot <NUM> is arranged between the wire-outlet holes <NUM> and the pulling member operating hole <NUM>, and has its two ends respectively connected with the wire-outlet holes <NUM> and the pulling member operating hole <NUM>, and the outlet wire inserted in the wire-outlet holes <NUM> shelters the pulling member' dig slot <NUM>.

Preferably, the circuit breaker housing <NUM> further includes a pulling member' dig slot <NUM> arranged on the front side wall <NUM>, the pulling member' dig slot <NUM> is arranged between the switch-off button hole <NUM> and the pulling member operating hole <NUM>, when the circuit breaker is in the switch-on state, the switch-off button <NUM> of the circuit breaker shelters the pulling member' dig slot <NUM>.

Preferably, the button holes <NUM>-<NUM> and the pulling member operating hole <NUM> are arranged at one end of the front side wall <NUM>, one wire-outlet hole <NUM> is arranged at the other end of the front side wall <NUM>, as a first wire-outlet hole, and the other wire-outlet hole <NUM> is arranged between the first wire-outlet hole and the button holes <NUM>-<NUM>, as a second wire-outlet hole; the button holes <NUM>-<NUM> and the second wire-outlet hole are positioned on the same side of the pulling member operating hole <NUM>;.

Compared with the existing circuit breaker which releases the position-limiting co-operation with the assembling position housing by pulling the button, the plug-in circuit breaker of the present invention is independently provided with the unlocking mechanism, so as to avoid the circuit breaker from being mistakenly pulled out due to an excessive pulling force during pulling the button for a switch-off operation.

In addition, of the unlocking mechanism of the present invention, the pulling member is drivingly cooperated with the first locking member through the linkage member, thereby improving the fault tolerance and safety performance of the unlocking mechanism, and reducing the structural accuracy requirements to the pulling member, the linkage member and the first locking member, and helping to abate the difficulty in production and improve the production efficiency.

In addition, the circuit breaker housing is provided with a reasonable structural design and compact layout, which helps to install and use the circuit breaker. Moreover, the wire-outlet holes, the button holes and the pulling member operating hole of the circuit breaker housing are centrally arranged on the front side wall, providing more convenience for users to operate it; the wire-inlet holes are arranged on the rear side wall opposite to the front side wall, helping to increase the creepage distance between the wire-inlet end and the wire-outlet end and improve the insulation performance of the 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.

As shown in <FIG>, the circuit breaker of the present invention, especially a plug-in circuit breaker, comprises the circuit breaker housing <NUM>, the button mechanism <NUM> arranged inside the circuit breaker housing <NUM>, an operating mechanism connected with the button mechanism <NUM>, the movable contact <NUM> connected with the operating mechanism, the static contact <NUM> co-operated with the movable contact <NUM>, and the button mechanism <NUM> being operated to enable the circuit breaker to switch on /switch off by means of the operating mechanism, which enables the movable contact <NUM> and the static contact <NUM> to be connected/disconnected.

Of course, following an actual need, as shown in <FIG>, the circuit breaker of the present invention may further comprises the short-circuit protection mechanism <NUM>, an overload protection mechanism and the arc-extinguishing system <NUM> all arranged inside the circuit breaker housing <NUM>. The short-circuit protection mechanism <NUM> and the overload protection mechanism actuate the operating mechanism to enable the circuit breaker to trip off when short-circuit and overload faults occur in the circuit breaker, respectively, so as to basically function as a circuit protector. The arc-extinguishing system <NUM> is used to extinguish the arc generated at the disconnection of the movable contact <NUM> and the static contact <NUM>, helping to improve the disconnection performance of the circuit breaker and improve the safety of electricity consumption.

As shown in <FIG>, the circuit breaker housing <NUM> includes the switch-on button hole <NUM> and the switch-off button hole <NUM> all arranged thereon. The button mechanism <NUM> includes the switch-on button <NUM> and the switch-off button <NUM> slidably arranged inside the circuit breaker housing <NUM>, respectively. The switch-on button <NUM> includes a switch-on button operating end arranged at one end thereof and slidably arranged in the switch-on button hole <NUM>. The switch-off button <NUM> includes a switch-off button operating end arranged at one end thereof and slidably arranged in the switch-off button hole <NUM>. While the switch-on button operating end/switch-off button operating end is being pressed toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on/switch off, correspondingly said switch-off button operating end/switch-on button operating end moves toward the outside of the circuit breaker housing <NUM>.

Further, as shown in <FIG>, the operating mechanism includes a bar linkage, and the transmission member <NUM> and a lever mechanism all pivotally arranged inside the circuit breaker housing <NUM>. The bar linkage includes the switch-on connecting rod <NUM>, the switch-off connecting rod <NUM> and the transmission connecting rod <NUM>. The reverse end of the switch-on button <NUM> is drivingly connected to the transmission member <NUM> through the switch-on connecting rod <NUM>, and the reverse end of the switch-off button <NUM> is drivingly connected to the transmission member <NUM> through the switch-off connecting rod <NUM>. The transmission member <NUM> is drivingly connected with the lever mechanism through the transmission connecting rod <NUM>, and the lever mechanism is connected with the movable contact <NUM> of the circuit breaker. When the switch-on button <NUM> is pressed to enable the circuit breaker to switch on, the switch-on button <NUM> actuates the transmission member <NUM> to rotate in a first direction through the switch-on connecting rod <NUM>, meanwhile, the rotation of the transmission member <NUM> drives the switch-off button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the switch-off connecting rod <NUM>. When the switch-off button <NUM> is pressed to enable the circuit breaker to switch off, the switch-off button <NUM> actuates the transmission member <NUM> to rotate in a second direction through the switch-off connecting rod <NUM>, meanwhile, the rotation of the transmission member <NUM> drives the switch-on button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the switch-on connecting rod <NUM>, so the first direction and the second direction are opposite to each other. Among them, the transmission member <NUM> similarly functions as a handle of a traditional small-sized circuit breaker, and the switch-on button <NUM> and the switch-off button <NUM> interact with the transmission member <NUM> through the connecting rods. The lever mechanism may adopt the existing solutions such as a four-bar linkage or a multi-bar linkage.

The present invention has an improvement in that the button mechanism <NUM> includes the switch-on button <NUM> and the switch-off button <NUM>, which can be respectively pressed by users to actuate the circuit breaker to switch on/switch off, and the switch-on button <NUM> moves in the direction opposite to the movement of the switch-off button <NUM>, that is, while the switch-on button <NUM>/switch-off button <NUM> is being pressed toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on/switch off, the corresponding switch-on button <NUM>/switch-off button <NUM> will move toward the outside of the circuit breaker housing <NUM>, in other words, users can distinguish the states stood by the circuit breaker (switch-on or switch-off state) by observing the states of the switch-on button <NUM> and the switch-off button <NUM>. Firstly, compared with the existing circuit breaker adopting a mechanism which is pressed and pulled to enable the circuit breaker to switch on/switch off, the circuit breaker of the present invention enables the circuit breaker to switch on/switch off by pressing the button, thereby preventing the circuit breaker from being mistakenly pulled out. Secondly, the states of the circuit breaker can be judged by observing the states of the switch-on button <NUM> and the switch-off button <NUM>, without necessity to set up a switch-on indicating apparatus and a switch-off indicating apparatus, respectively, simplifying the structure of the circuit breaker and saving the internal space of the circuit breaker, as well as helping to follow the trend of the miniaturization of the circuit breaker.

Preferably, as shown in <FIG>, the circuit breaker of the present invention further includes a locking mechanism and an unlocking mechanism arranged inside the circuit breaker housing1. As shown in <FIG>, the locking mechanism includes the first locking member 1a with one end protruding outside the circuit breaker housing <NUM>, the locking member opening <NUM> arranged on the circuit breaker housing <NUM> for co-operation with the locking mechanism, and an assembling limiting hole arranged on the assembling position housing of the circuit breaker housing. When the circuit breaker is assembled to the designated position, the locking member opening <NUM> of the plug-in circuit breaker corresponds to the assembling limiting hole, and when the plug-in circuit breaker is not assembled to the designated position, the locking member opening <NUM> of the plug-in circuit breaker is misaligned with the assembling limiting hole, enabling the assembling position housing to screen the locking member opening <NUM>, as it pertains to the prior art in the art, details for it are not described herein again.

The present invention has another improvement in the structure for locking and co-operating. When the circuit breaker is in the switch-off state, one end of the first locking member 1a extends from the locking member opening <NUM> and protrudes outside the circuit breaker housing <NUM>, and the first locking member 1a can retract into the inside of the circuit breaker housing <NUM> under the function of an external force for retraction, and the first locking member 1a is co-operated with the switch-on button <NUM> and/or the switch-off button <NUM> in a position-limit way, locking the switch-on button <NUM> and/or the switch-off button <NUM> to enable the circuit breaker not to switch on. When the circuit breaker is in the switch-on state, one end of the first locking member 1a protrudes outside the circuit breaker housing <NUM>, and the first locking member 1a can not retract into the inside of the circuit breaker housing <NUM> at a position limited by the switch-on button <NUM> and/or the switch-off button <NUM>. When the first locking member 1a protrudes outside the circuit breaker housing <NUM>, the first locking member 1a does not lock the switch-on button <NUM> and/or the switch-off button <NUM>, then the switch-on button <NUM> and/or the switch-off button <NUM> can normally perform switch on and switch off operations.

Preferably, as shown in <FIG>, before the circuit breaker is installed to the assembling position of the circuit breaker, if the circuit breaker is in the switch-on state, one end of the first locking member 1a protrudes outside the circuit breaker housing <NUM> and can not retract into the inside of the circuit breaker housing <NUM> because the limitation by the switch-on button <NUM> and/or the switch-off button <NUM>, so that the circuit breaker cannot be inserted and installed into the assembling position of the circuit breaker in the switch-on state.

While the circuit breaker is being installed to the assembling position of the circuit breaker, the assembling position housing of the circuit breaker applies a external force for retraction on the first locking member 1a during the assembling process, squeezes the first locking member 1a to enable it move toward the inside of the circuit breaker housing <NUM> and retract into the inside of the circuit breaker housing <NUM>, and enables the first locking member 1a to be co-operated with the switch-on button <NUM> and/or the switch-off button <NUM> in a position-limit way, locking the switch-on button <NUM> and/or the switch-off button <NUM>, so as to prevent the circuit breaker from switching onswitching on, and enable the circuit breaker not to switch on during the assembling process and improve safety.

After the circuit breaker has been assembled to the designated position, the locking member opening <NUM> corresponds to the assembling limiting hole, and the assembling position housing does not apply an external force for retraction on the first locking member 1a, so that the first locking member 1a protrudes outside the circuit breaker housing <NUM> again, unlocks the button mechanism <NUM> and co-operating the first locking member 1a with the assembling position housing in a position-limit way to enable the circuit breaker to normally switch on and switch off through the switch-on button <NUM> and/or the switch-off button <NUM>, and prevent the circuit breaker from being pulled out from its assembling position at will, so as to ensure that the circuit breaker won't fall out from the assembling position of the circuit breaker due to the vibration during transportation.

After the circuit breaker has been assembled to the designated position, when the circuit breaker is in the switch-on state, the switch-on button <NUM> and/or the switch-off button <NUM> prevent the first locking member 1a from moving toward the inside of the circuit breaker housing <NUM>, so that the circuit breaker cannot be pulled out from the assembling position of the circuit breaker in the switch-on state.

Further, as shown in <FIG> and <FIG>, when the circuit breaker is in the switch-off state, operating the unlocking mechanism enables the first locking member 1a to move toward the inside of the circuit breaker housing <NUM>, and retract into the inside of the circuit breaker housing <NUM>, releasing the position-limiting co-operation of the first locking member 1a with the assembling position housing and making its co-operation with the button mechanism <NUM>.

Of the locking mechanism of the circuit breaker of the present invention, the first locking member 1a locks the switch-on button <NUM> and/or the switch-off button <NUM> by means of its co-operation with the switch-on button <NUM> and/or the switch-off button <NUM> at installation to the assembling position of the circuit breaker, avoiding the circuit breaker from switching onswitching on due to the user's misoperation/accidental touch during the installation process of the circuit breaker, and ensuring user's personal safety. Moreover, when the circuit breaker is in the switch-on state, the switch-on button <NUM> and/or the switch-off button <NUM> prevent the first locking member from moving toward the inside of the circuit breaker housing, that is, once the circuit breaker switches on, it cannot be installed to its assembling position, or pulled out from its assembling position at will, so as to ensure it to be installed to its assembling position in the switch-off state, or to be pulled out of its assembling position, thereby ensuring the personal safety of users.

It should be pointed out that the "locking/unlocking the button mechanism <NUM>" refers to making position-limiting co-operation/releasing position-limiting co-operation with the button mechanism <NUM> through the first locking member 1a to prevent/allow the switch-on button <NUM> and/or the switch-off button <NUM> from moving/to move in the designated direction (ie a switch-on direction or a switch-off direction).

After the circuit breaker has been assembled to the assembling position of the circuit breaker and into the designated position, the first locking member 1a is co-operated with the assembling position housing of the circuit breaker in a position-limit way. The unlocking mechanism includes an independent pulling member 2a drivingly co-operated with the first locking member 1a. When the circuit breaker is in the switch-off state, pulling the pulling member 2a enables the first locking member 1a to move towards the inside of the circuit breaker housing <NUM>, and retract into the inside of the circuit breaker housing <NUM>, so as to release the position-limiting co-operation of the first locking member 1a with the assembling position housing, so that the circuit breaker can be pulled out of the assembling position housing of the circuit breaker. Further, as shown in <FIG>, the unlocking mechanism further includes a linkage member 3a, of which one end is drivingly co-operated with the first locking member 1a, and the other end is drivingly co-operated with the pulling member 2a. Pulling the pulling member 2a enables the linkage member 3a to rotate, and the linkage member 3a drives the first locking member 1a to move towards the inside of the circuit breaker housing <NUM>, retract into the inside of the circuit breaker housing <NUM> and release its position-limiting co-operation with the assembling position housing. Compared with the existing circuit breaker which releases the position-limiting co-operation with the assembling position housing by pulling the button, the present invention has yet another improvement in that the circuit breaker is independently provided with the pulling member 2a of the unlocking mechanism, instead of unlocking the first locking member through the button mechansim, thereby avoiding the circuit breaker from being mistakenly pulled out by the pulling button. Moreover, in the unlocking mechanism of the present invention, the pulling member 2a is drivingly co-operated with the first locking member 1a through the linkage member 3a, thereby improving the fault tolerance of the unlocking mechanism, lowering requirements for the structural accuracy of the pulling member 2a, the linkage member 3a and the first locking member 1a and helping to reduce production difficulty and improve production efficiency.

Preferably, as shown in <FIG>, the locking mechanism includes the second locking member 1b pivotally arranged on the circuit breaker housing <NUM>, and the second locking member 1b includes the second locking end 13b. Pressing the switch-on button <NUM> to actuate the operating mechanism enables the circuit breaker to switch on, and simultaneously enables the switch-off button <NUM> to move toward the outside of the circuit breaker housing <NUM>, and the switch-on button <NUM> and/or the switch-off button <NUM> actuate the second locking member 1b to rotate, so that the second locking end 13b protrudes outside the circuit breaker housing <NUM>, and the second locking member 1b is limited at a position by the switch-on button <NUM> and/or the switch-off button <NUM> and cannot retract into the inside of the circuit breaker housing <NUM>. Pressing the switch-off button <NUM> to actuate the operating mechanism enables the circuit breaker to switch off, and simultaneously enables the switch-on button <NUM> to move toward the outside of the circuit breaker housing <NUM>, and the switch-on button <NUM> and/or the switch-off button <NUM> actuate the second locking member 1b to rotate reversely, so that the second locking end 13b retracts inside the circuit breaker housing <NUM>.

Further, as shown in <FIG>, when the circuit breaker switches on, the switch-off button <NUM> actuates the second locking member 1b to rotate, so that the second locking end 13b protrudes outside the circuit breaker housing <NUM>; when the circuit breaker switches off, the switch-on button <NUM> actuates the second locking member 1b to rotate, so that the second locking end 13b retracts into the inside of the circuit breaker housing <NUM>. Of course, when the circuit breaker switches on, the switch-on button <NUM> may actuate the second locking end 13b to protrude outside the circuit breaker housing <NUM>; and when the circuit breaker switches off, the switch-off button <NUM> may actuate the second locking end 13b to retract into the inside of the circuit breaker housing <NUM>. In the circuit breaker of the present invention, the locking mechanism further includes the second locking member 1b, and the second locking end 13b of the second locking member 1b protrudes from the outside of the circuit breaker housing <NUM> when the circuit breaker switches on, thereby preventing the circuit breaker from being installed to the assembling position of the circuit breaker in the switch-on state, or being pulled out of the assembling position of the circuit breaker in the switch-on state, and ensuring the electrical safety and personal safety of users.

It should be noted that the first locking member 1a and the second locking member 1b of the locking mechanism of the present invention function in some same ways as well as different ways, so they can coexist with each other to improve the electrical safety of the circuit breaker, of course, there may be only the first locking member 1a or the second locking member 1b provided in the locking mechanism. In the case that the first locking member 1a and the second locking member 1b are both provided in the locking mechanism, when the circuit breaker switches on outside the assembling position of the circuit breaker, the first locking member 1a and the second locking member 1b both protrude from the circuit breaker housing, so as to enable the circuit breaker not to be installed into the assembling position of the circuit breaker; when the circuit breaker is installed to the assembling position of the circuit breaker, but not to the designated position, the assembling position housing presses the first locking member 1a back into the circuit breaker housing, preventing the switch-on button from switching onswitching on; after the circuit breaker has been installed to the assembling position of the circuit breaker and to the designated position and it has switched on, the first locking member 1a and the second locking member 1b both protrude from the circuit breaker housing, and cannot be unlocked, the circuit breaker cannot be pulled out from the assembling position of the circuit breaker; after the circuit breaker has been installed to the assembling position of the circuit breaker and it has broken contact, the second locking member 1b retracts into the circuit breaker housing, and the first locking member1a still protrudes from the circuit breaker housing to prevent the circuit breaker from separating from the assembling position of the circuit breaker under shakes during transportation, etc.; after the circuit breaker has been installed to the assembling position of the circuit breaker and it has broken contact, pulling the pulling member 2a outwards enables the first locking member 1a to be pulled back into the circuit breaker housing to unlock, next continuously pulling the first locking member 1a enables the circuit breaker to be pulled out of the cabinet.

Preferably, as shown in <FIG>, <FIG> and <FIG>, an embodiment of the circuit breaker housing <NUM> is provided.

The circuit breaker housing <NUM> is integrally formed into a hexahedral structure, including the front side wall <NUM> and the rear side wall <NUM> arranged oppositely, the wire-outlet holes <NUM>, the button holes <NUM>-<NUM> and the pulling member operating hole <NUM> arranged on the front side wall <NUM>, and the wire-inlet holes <NUM> arranged on the rear side wall <NUM>. The wire-outlet holes <NUM>, the button holes <NUM>-<NUM> and the pulling member operating hole <NUM> of the circuit breaker housing <NUM> are centrally arranged on the front side wall <NUM>, more easing operation for users, and the wire-inlet holes <NUM> are arranged on the rear side wall <NUM> opposite to the front side wall <NUM>, helping to increase the creepage distance between the wire-inlet end and the wire-outlet end, and improve the insulation performance of the circuit breaker. Further, as shown in <FIG>, the button holes <NUM>-<NUM> include the switch-on button hole <NUM> and the switch-off button hole <NUM> arranged side by side. As for the above structure, it is easy to separately set up the switch-on button and the switch-off button of the circuit breaker, thereby enabling the circuit breaker to switch on/switch off through different structures. Compared with the existing circuit breaker enabling a circuit breaker to switch on/switch off by pressing/pulling a button, the structure avoids the circuit breaker from being pulled out with an excessive force when the circuit breaker switches off by pulling the button.

We shall further describe the circuit breaker of the present invention with reference to the figures and examples as follows.

As shown in <FIG>, the circuit breaker of the present invention is a plug-in circuit breaker, comprising the circuit breaker housing <NUM>, the button mechanism <NUM> arranged inside the circuit breaker housing <NUM>, an operating mechanism connected with the button mechanism <NUM>, the movable contact <NUM> connected with the operating mechanism, the static contact <NUM> co-operated with the movable contact <NUM>, and the button mechanism <NUM> being operated to enable the circuit breaker to switch on /switch off by means of the operating mechanism, which enables the movable contact <NUM> and the static contact <NUM> to be connected/disconnected. Of course, following an actual need, as shown in <FIG>, the circuit breaker of the present invention may further comprises the short-circuit protection mechanism <NUM>, an overload protection mechanism and the arc-extinguishing system <NUM> all arranged inside the circuit breaker housing <NUM>. The short-circuit protection mechanism <NUM> and the overload protection mechanism actuate the operating mechanism to enable the circuit breaker to trip off when short-circuit and overload faults occur in the circuit breaker, respectively, so as to basically function as a circuit protector. The arc-extinguishing system <NUM> is used to extinguish the arc generated at the disconnection of the movable contact <NUM> and the static contact <NUM>, helping to improve the disconnection performance of the circuit breaker and improve the safety of electricity consumption. Further, the short-circuit protection mechanism <NUM> and the overload protection mechanism are an electromagnetic release and a dual metal piece drivingly co-operated with the operating mechanism, respectively. The arc-extinguishing system <NUM> is an arc-extinguishing chamber arranged on one side of the movable contact and the static contact <NUM>, and involves side walls of the arc-extinguishing chamber and a plurality of arc-extinguishing sheets arranged between the side walls of the arc-extinguishing chamber.

Preferably, as shown in <FIG>, an embodiment of the operating mechanism is provided.

As shown in <FIG>, the circuit breaker housing <NUM> includes the switch-on button hole <NUM> and the switch-off button hole <NUM> all arranged thereon. The button mechanism <NUM> includes the switch-on button <NUM> and the switch-off button <NUM> slidably arranged inside the circuit breaker housing <NUM>, respectively. The switch-on button <NUM> includes a switch-on button operating end arranged at one end thereof and slidably arranged in the switch-on button hole <NUM>. The switch-off button <NUM> includes a switch-off button operating end arranged at one end thereof and slidably arranged in the switch-off button hole <NUM>. While the switch-on button operating end/switch-off button operating end is being pressed toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on/switch off, the switch-off button operating end/switch-on button operating end moves toward the outside of the circuit breaker housing <NUM>.

Further, as shown in <FIG>, the operating mechanism includes a bar linkage, and the transmission member <NUM> and a lever mechanism all pivotally arranged inside the circuit breaker housing <NUM>. The bar linkage includes the switch-on connecting rod <NUM>, the switch-off connecting rod <NUM> and the transmission connecting rod <NUM>. The reverse end of the switch-on button <NUM> is drivingly connected to the transmission member <NUM> through the switch-on connecting rod <NUM>, and the reverse end of the switch-off button <NUM> is drivingly connected to the transmission member <NUM> through the switch-off connecting rod <NUM>. The transmission member <NUM> is drivingly connected with the lever mechanism through the transmission connecting rod <NUM>, and the lever mechanism is connected with the movable contact <NUM> of the circuit breaker. When the switch-on button <NUM> is pressed toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on, the switch-on button <NUM> actuates the transmission member <NUM> to rotate in a first direction through the switch-on connecting rod <NUM>, meanwhile, the rotation of the transmission member <NUM> drives the switch-off button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the switch-off connecting rod <NUM>. When the switch-off button <NUM> is pressed toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch off, the switch-off button <NUM> actuates the transmission member <NUM> to rotate in a second direction through the switch-off connecting rod <NUM>, meanwhile, the rotation of the transmission member <NUM> drives the switch-on button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the switch-on connecting rod <NUM>, so the first direction and the second direction are opposite to each other.

Further, as shown in <FIG>, the lever mechanism includes the jump buckle <NUM>, the lock catch <NUM> and the rotating plate <NUM>. The rotating plate <NUM> is pivotally arranged on the circuit breaker housing <NUM>, the jumper buckle <NUM> and the lock catch <NUM> are locked with each other and pivotally arranged on the rotating plate <NUM>, respectively. The rotating plate <NUM> is connected with the movable contact <NUM>, and the transmission member <NUM> is drivingly connected with the jumper buckle <NUM> through the transmission connecting rod <NUM>. The transmission member <NUM> rotates in the first direction and drives the lever mechanism to rotate in the first direction in their entirety through the transmission connecting rod <NUM>, and the lever mechanism drives the movable contact <NUM> to sway, as so to enable the circuit breaker to switch on. The transmission member <NUM> rotates in the second direction, and drives the jump buckle <NUM> to rotate in the second direction through the transmission connecting rod <NUM>, so that the jump buckle <NUM> and the lock catch <NUM> are released from each other, so as to enable the circuit breaker to switch off. When a short-circuit or overload fault occurs in the circuit breaker, the short-circuit protection mechanism <NUM> or the overload protection mechanism actuates the lock catch <NUM> to release the lock catch <NUM> from the jump buckle <NUM>, so as to enable the circuit breaker to trip off and achieve self-protection. Further, the movable contact <NUM> is connected with the rotating plate <NUM> through an elastic member to enable the movable contact <NUM> to operate beyond a stroke. Of course, other solutions may also be adopted for the lever mechanism, all within the protection scope of the present invention. Preferably, as shown in <FIG>, an embodiment of the transmission member <NUM> is provided.

As shown in <FIG>, the transmission member <NUM> includes the transmission member axle hole <NUM>, the first connection hole <NUM>, the second connection hole <NUM> and the third connection hole <NUM>. The first connection hole <NUM>, the second connection hole <NUM> and the third connection hole <NUM> are positioned at three vertices of a triangle thereon, respectively. The transmission member axle hole <NUM> is arranged in the middle of the transmission member <NUM>. The first connection hole <NUM> and the third connection hole <NUM> are arranged on one side of the transmission member axle hole <NUM>, and the second connection hole <NUM> is arranged on the other side of the transmission member axle hole <NUM>. The transmission member <NUM> is pivotally arranged on the circuit breaker housing <NUM> through its transmission member axle hole <NUM>, and the transmission member <NUM> is connected to the switch-on connecting rod <NUM>, the switch-off connecting rod <NUM> and the transmission connecting rod <NUM> by means of the first connection hole <NUM>, the second connection hole <NUM> and the third connection hole <NUM>, respectively.

Specifically, in the directions shown in <FIG>, the upper, lower, left, and right sides of <FIG> correspond to the upper, lower, left, and right sides of the circuit breaker, respectively, and the side of <FIG> facing the reader corresponds to the front side of the circuit breaker. The switch-on button hole <NUM> and the switch-off button hole <NUM> are arranged on the upper side wall of the circuit breaker housing <NUM>. The upper end of the switch-on button <NUM> is the switch-on button operating end slidably arranged inside the switch-on button hole <NUM>, and the upper end of the switch-off button <NUM> is the switch-off button operating end slidably arranged inside the switch-off button hole <NUM>. The lower end of the switch-on button <NUM> is drivingly connected to the first connection hole <NUM> at the right end of the transmission member <NUM> through the switch-on connecting rod <NUM>, the lower end of the switch-off button <NUM> is drivingly connected to the second connection hole <NUM> at the left end of the transmission member <NUM> through the switch-off connecting rod <NUM>, the third connection hole <NUM> at the right end of the transmission member <NUM> is drivingly connected to the jump buckle <NUM> through the transmission connecting rod <NUM>, and the transmission member <NUM> is pivotally arranged on the transmission member-installing shaft <NUM> on the circuit breaker housing <NUM> through the transmission member axle hole <NUM> therein. The switch-on button <NUM> is pressed downwards, thus it drives the transmission member <NUM> to rotate clockwise (the first direction) through the switch-on connecting rod <NUM>, meanwhile, the transmission member <NUM> drives the movable contact <NUM> to sway clockwise to switch on with the static contact <NUM> by means of the transmission connecting rod <NUM>, the jump buckle <NUM> and the lock catch <NUM> co-operated with each other, and the rotating plate <NUM>, thus the circuit breaker enters the switch-on state. The switch-off button <NUM> is pressed downwards, thus it drives the transmission member <NUM> to rotate counterclockwise (the second direction) through the switch-off connecting rod <NUM>, meanwhile, the transmission member <NUM> drives the jump buckle <NUM> to sway counterclockwise through the transmission connecting rod <NUM>, and release its locking co-operation with the lock catch <NUM>, thus the rotating plate <NUM> drives the movable contact <NUM> to sway counterclockwise and switches off with the static contact <NUM>, and the circuit breaker enters the switch-off state.

Preferably, the switch-on button operating end and the switch-off button operating end are provided with a first indicator and a second indicator for indicating the switch-on and switch-off states, respectively, and the first indicator and the second indicator both include a color mark and/or a symbol mark. The first indicator is used to indicate the switch-on state, and correspondingly the second indicator is used to indicate the switch-off state; or the first indicator is used to indicate the switch-off state, thus the second indicator is used to indicate the switch-on state. Further, the switch-on button operating end is different from the switch-off button operating end in the color mark and the symbol mark. For example, the color mark and the symbol mark of the switch-on button operating end may be red/SWITCH-OFF symbol (O), respectively; the color mark and the symbol mark of the switch-off button operating end may be green/SWITCH-ON symbol (I), respectively. When the circuit breaker switches on, the switch-on button operating end enters the switch-on button hole <NUM>, and the switch-off button operating end is highlighted on the switch-off button hole <NUM>, so it can be judged that the circuit breaker is in the switch-on state according to the green mark and/or the SWITCH-ON symbol (I). On the contrary, when the circuit breaker switches off, the switch-off button operating end enters the switch-off button hole <NUM>, and the switch-on button operating end is highlighted on the switch-on button hole <NUM>, so it can be judged that the circuit breaker is in the switch-off state according to the red mark and/or the SWITCH-OFF symbol (O). The first indicator and the second indicator on the switch-on button operating end and the switch-off button operating end help users to observe and judge the state of the circuit breaker more intuitively, so it is beneficial to improve users' electrical safety.

Preferably, as shown in <FIG> and <FIG>, the switch-on button <NUM> and the switch-off button <NUM> of the circuit breaker of the present invention both have a long-strip shape in their entirety, which are parallelly arranged and slidably and linearly installed inside the circuit breaker housing <NUM>, which includes a first track mechanism and a second track mechanism used to respectively define the movement paths of the switch-on button <NUM> and the switch-off button <NUM>.

As shown in <FIG>, the first embodiment of the first track mechanism and the second track mechanism is provided.

As shown in <FIG>, the first track mechanism includes the switch-on button track protrusion <NUM> arranged on the switch-on <NUM> and the switch-on button track groove <NUM> arranged on the circuit breaker housing, and the switch-on button track protrusion <NUM> is slidably arranged in the switch-on button track groove <NUM>. The second track mechanism includes a switch-off button track groove arranged on the circuit breaker housing <NUM>, and the switch-off button <NUM> is slidably arranged in the switch-off button track groove. Further, as shown in <FIG>, the circuit breaker housing <NUM> includes the first rib <NUM>, on both sides of which the switch-on button track groove <NUM> and the switch-off button track groove are respectively positioned. The switch-on button track groove <NUM> is formed by means of encirclement between the first rib <NUM> and a side wall of the circuit breaker housing <NUM> opposite to the first rib <NUM>. The circuit breaker housing <NUM> further includes the second rib <NUM> opposite to the first rib <NUM>, and the switch-off button track groove is formed by means of encirclement between the first rib <NUM> and the second rib <NUM>.

Preferably, as shown in <FIG>, the switch-on button <NUM> includes the switch-on button operating portion <NUM> and the switch-on button transmission portion <NUM>. Of the switch-on button operating portion <NUM>, one end is the switch-on button operating end, and the other end is connected to the switch-on button transmission portion <NUM> in overlap, the other end of the switch-on button transmission portion <NUM> is provided with the switch-on button connecting hole <NUM> and the switch-on button track protrusion <NUM>. The switch-on button connecting hole <NUM> is connected with one end of the switch-on connecting rod <NUM> of the operating mechanism. The switch-on button track protrusion <NUM> and the switch-on button operating portion <NUM> are positioned at the same side of the switch-on button transmission portion <NUM>. Specifically, in the directions shown in <FIG>, of the switch-on button operating portion <NUM>, the left end is the switch-on button operating end, and the right end is connected to the switch-on button transmission portion <NUM> in overlap, the right end of the switch-on button transmission portion <NUM> is provided with the switch-on button connecting hole <NUM> and the switch-on button track protrusion <NUM>. The switch-on button track protrusion <NUM> and the switch-on button operating portion <NUM> are positioned at the lower side of the switch-on button transmission portion <NUM>. Of course, the other end of the switch-on button operating portion <NUM> can also be horizontally connected with the switch-on button transmission portion <NUM>, and positioned at the same plane, instead of overlap.

Preferably, as shown in <FIG>, the switch-off button <NUM> includes the switch-off button operating portion <NUM> and the switch-off button transmission portion <NUM>. Of the switch-off button operating portion <NUM>, one end is the switch-off button operating end, and the other end is connected to one end of the switch-off button transmission portion <NUM>, the other end of which is provided with the switch-off button connecting hole <NUM>,which is connected with one end of the switch-off connecting rod <NUM> of the operating mechanism. Specifically, in the directions shown in <FIG>, the switch-off button <NUM> has a long-strip shape in its entirety. Of the switch-off button operating portion <NUM>, the left end is the switch-off button operating end, and the right end is connected to one end of the switch-off button transmission portion <NUM>, the right end of which is provided with the switch-off button connecting hole <NUM>. The switch-off button connecting hole <NUM> is positioned at the lower side of the switch-off button transmission portion <NUM>.

Specifically, as shown in <FIG>, the first rib <NUM> is arranged on the circuit breaker housing <NUM>, and forms the switch-on button track groove <NUM> by means of encirclement with the left side wall of the circuit breaker housing <NUM>. The second rib <NUM> is arranged on the right side of the first rib <NUM>, and forms the switch-off button track groove by means of encirclement with the latter. The switch-on button operating end is slidably arranged in the switch-on button hole <NUM>, meanwhile the switch-on button track protrusion <NUM> is slidably arranged in the switch-on button track groove <NUM> to define the movement path of the switch-on button <NUM>. The switch-off button operating end is slidably arranged in the switch-off button hole <NUM>, meanwhile, the switch-off button transmission portion <NUM> is slidably arranged between the first rib <NUM> and the second rib <NUM> to define the movement path of the switch-off button <NUM>.

As shown in <FIG>, the second embodiment of the first track mechanism and the second track mechanism is provided.

As shown in <FIG>, the first track mechanism includes the switch-on button track protrusion <NUM> arranged on the switch-on <NUM> and the switch-on button track groove <NUM> arranged on the circuit breaker housing, and the switch-on button track protrusion <NUM> is slidably arranged in the switch-on button track groove <NUM>. The second track mechanism includes the switch-off button track bar <NUM> arranged on the switch-on button <NUM> and in the length direction of the switch-on button <NUM>, and the switch-off button track groove <NUM> arranged on the switch-off button <NUM>, and the switch-off button track groove <NUM> is slidably co-operated with the switch-off button track bar <NUM>.

Preferably, as shown in <FIG>, The switch-on button <NUM> includes the switch-on button operating portion <NUM>, the switch-on button transmission portion <NUM> and the switch-off button track bar <NUM>. Of the switch-on button operating portion <NUM>, one end is the switch-on button operating end, and the other end is connected to the switch-on button transmission portion <NUM> in overlap, the other end of the switch-on button transmission portion <NUM> is provided with the switch-on button connecting hole <NUM> and the switch-on button track protrusion <NUM>. The switch-off button track bar <NUM> is arranged on one side of the switch-on button transmission portion <NUM>, and the switch-off button track bar <NUM> and the switch-on button operating portion <NUM> are positioned on the same side of the switch-on button transmission portion <NUM>. The switch-on button connecting hole is connected to one end of the switch-on connecting rod <NUM> of the operating mechanism. Specifically, in the directions shown in <FIG>, of the switch-on button operating portion <NUM>, the upper end is the switch-on button operating end, and the lower end is connected to the upper end of the switch-on button transmission portion <NUM> in overlap, the lower end of the switch-on button transmission portion <NUM> is provided with the switch-on button connecting hole <NUM> and the switch-on button track protrusion <NUM>. The switch-off button track bar <NUM> is arranged between the switch-on button connecting hole <NUM> and the switch-on button operating portion <NUM>, connected with the latter, respectively, and positioned on the right side of the switch-on button transmission portion <NUM>. The switch-on button track protrusion <NUM> is arranged on the left side of the switch-on button transmission portion <NUM>. Further, in the directions shown in <FIG>, the switch-on button bottom foot <NUM> is arranged on the left side of the upper end of the switch-on button transmission portion <NUM>.

Preferably, as shown in <FIG>, the switch-off button <NUM> includes the switch-off button operating portion <NUM>, the switch-off button transmission portion <NUM>, the switch-off button track portion <NUM> and the switch-off button connecting hole <NUM>. Of the switch-off button operating portion <NUM>, one end is the switch-off button operating end, and the other end is connected to one end of the switch-off button transmission portion <NUM>, the other end of which is provided with the switch-off button connecting hole <NUM>. The switch-off button track portion <NUM> is arranged on one side of the switch-off button transmission portion <NUM>, and the switch-off button track groove <NUM> is arranged on the side of the switch-off button track portion <NUM> facing the switch-on button transmission portion <NUM>. Specifically, in the directions shown in <FIG>, of the switch-off button operating portion <NUM>, the left end is the switch-off button operating end, and the right end is connected to the left end of the switch-off button transmission portion <NUM>, the right end of which is provided with the switch-off button connecting hole <NUM>. The switch-off button track portion <NUM> is arranged on the rear side of the right end of the switch-off button transmission portion <NUM>, and the switch-off button track groove <NUM> is arranged on the lower side of the switch-off button track portion <NUM>.

Specifically, as shown in <FIG>, the first track mechanism includes the third rib <NUM> arranged on the circuit breaker housing <NUM>, and the switch-on button track groove <NUM> is arranged in the middle of the third rib <NUM> in the length direction of the latter. As shown in <FIG>, the switch-on button <NUM> further includes the switch-on button bottom foot <NUM>, which is arranged at one end of the switch-on button transmission portion <NUM> connected to the switch-on button operating portion <NUM>, and which is positioned together with the switch-on button operating portion <NUM> at both ends of the switch-on button transmission portion <NUM>, respectively. The switch-off button track bar <NUM> is positioned between the switch-on button operating portion <NUM> and the switch-on button connecting hole <NUM>, and connected to the latter two, respectively. The switch-on button operating end is slidably arranged in the switch-on button hole <NUM>, and the switch-on button bottom foot <NUM> is slidably co-operated with the third rib <NUM>. The switch-on button track protrusion <NUM> is slidably arranged in the switch-on button track groove <NUM> to limit the movement path of the switch-on button <NUM>. The switch-off button operating end is slidably arranged in the switch-off button hole <NUM>, and the switch-off button track portion <NUM> is placed on one side of the switch-on button operating portion <NUM>. The switch-off button track groove <NUM> is slidably co-operated with the switch-off button track bar <NUM> to limit the movement path of the switch-off button.

Preferably, as shown in <FIG>, the circuit breaker of the present invention further includes the locking mechanism arranged inside the circuit breaker housing <NUM>, and one of the improvements of the present invention lies in the locking design of the locking mechanism.

As shown in <FIG>, the locking mechanism includes the first locking member 1a with one end protruding outside the circuit breaker housing <NUM>, which includes the locking member opening <NUM> co-operated with the first locking member 1a, one end of which extends to the outside of the circuit breaker housing <NUM> through the locking member opening <NUM>. When the circuit breaker is in the switch-off state, the first locking member 1a can retract into the inside of the circuit breaker housing <NUM> under the function of an external force for retraction. For example, while the circuit breaker is being installed to the assembling position of the circuit breaker, the assembling position housing of the circuit breaker squeezes the first locking member 1a to enable it move toward the inside of the circuit breaker housing <NUM> (assembling position housing applies an external force for retraction on the first locking member 1a) during the assembling process, and enables the first locking member 1a to be co-operated with the switch-on button <NUM> and/or the switch-off button <NUM> in a position-limit way, locking the switch-on button <NUM> and/or the switch-off button <NUM>, so as to prevent the circuit breaker from switching onswitching on. After the circuit breaker has been assembled to the designated position, the locking member opening <NUM> corresponds to the assembling limiting hole of the assembling position housing, so the first locking member 1a protrudes outside the circuit breaker housing <NUM> from the locking member opening <NUM> again and releases its position-limiting co-operation with the switch-on button <NUM> and/or the switch-off button <NUM>. Unlocking the button mechanism <NUM> and co-operating the first locking member 1a with the assembling limiting hole of the assembling position housing in a position-limit way enable the circuit breaker to normally switch on and switch off through the switch-on button <NUM> and/or the switch-off button <NUM>, and prevent the circuit breaker from being pulled out from its assembling position at will.

Further, as shown in <FIG>, the switch-on button <NUM> and/or the switch-off button <NUM> includes the button limiting groove <NUM> in the position-limiting co-operation with the first locking member 1a, and the first locking member 1a includes the first locking member limiting protrusion 14a fitted with the button limiting groove <NUM>. When the circuit breaker is in the switch-on state, the button limiting groove <NUM> is misaligned with the first locking member limiting protrusion 14a, and the switch-on button <NUM> and/or the switch-off button <NUM> prevent the first locking member 1a from moving toward the inside of the circuit breaker housing <NUM>. When the circuit breaker is in the switch-off state, the button limiting groove <NUM> is arranged opposite to the first locking member limiting protrusion 14a, and the first locking member 1a can move toward the inside of the circuit breaker housing <NUM>, enabling the first locking member limiting protrusion 14a to slide into the button limiting groove <NUM>.

Preferably, as shown in <FIG>, the switch-on button <NUM> and the switch-off button <NUM> are parallelly arranged and slidably and linearly installed inside the circuit breaker housing <NUM>. The first locking member 1a is movably and linearly installed inside the housing <NUM>, and the movement directions of the switch-on button <NUM> and the switch-off button <NUM> are perpendicular to the movement direction of the first locking member 1a. Further, as shown in <FIG>, the locking mechanism further includes the first resetting spring 5a arranged between the circuit breaker housing <NUM> and the first locking member 1a, and the first resetting spring 5a applies a force on the first locking member 1a, so as to enable one end of the first locking member 1a to protrude outside the circuit breaker housing <NUM> without interference from other external forces. When the circuit breaker is in the switch-off state, the first locking member 1a can retract into the circuit breaker housing <NUM> under the function of an external force for retraction.

Specifically, as shown in <FIG>, the switch-on button <NUM> and the switch-off button <NUM> can move left and right, as well as in the direction opposite to each other, synchronously, and the first locking member 1a can move up and down. As shown in <FIG>, the circuit breaker is in the switch-on state, the button limiting groove <NUM> of the switch-off button <NUM> is misaligned with first locking member limiting protrusion 14a of the first locking member 1a, so that the first locking member 1a cannot move down. As shown in <FIG>, the circuit breaker is in the switch-off state, the button limiting groove <NUM> of the switch-off button <NUM> is arranged opposite to the first locking member limiting protrusion 14a of the first locking member 1a, so that the first locking member 1a can move down, enabling the first locking member limiting protrusion 14a to slide into the button limiting groove, thereby limiting the left and right movements of the switch-on button <NUM> and the switch-off button <NUM>. It should be pointed out that the button limiting groove <NUM> may also be arranged on the switch-on button <NUM>, only in the case that the button limiting groove <NUM> is misaligned with the first locking member limiting protrusion 14a in the switch-on state of circuit breaker and the button limiting groove <NUM> is arranged opposite to the first locking member limiting protrusion 14a in the switch-off state of circuit breaker.

Further, as shown in <FIG>, the switch-on button <NUM> and the switch-off button <NUM> are parallelly arranged, and the switch-on button <NUM> and the first locking member 1a both are positioned above the switch-off button <NUM>, that is, the switch-on button <NUM> and the first locking member 1a are both positioned between the switch-off button <NUM> and the locking member opening <NUM>. The first locking member 1a is positioned at one side of the switch-on button <NUM>, and the switch-off button <NUM> includes the button limiting groove <NUM> co-operated with the first locking member 1a at a limited position. The first locking member 1a includes the first locking member limiting protrusion 14a fitted with the button limiting groove <NUM>, and the switch-on button <NUM> is provided with the switch-on button avoiding groove <NUM> used to leave off the first locking member limiting protrusion 14a of the first locking member 1a. When one end of the first locking member 1a protrudes outside the circuit breaker housing <NUM>, the first locking member limiting protrusion 14a is positioned in the switch-on button avoiding groove <NUM>, the width of which in the movement direction of the switch-on button <NUM> is much larger than the width of the first locking member limiting protrusion 14a, so the switch-on button <NUM> will not come into contact with the first locking member limiting protrusion 14a during its switch-on and switch-off movement, enabling the switch-on button <NUM> and the switch-off button <NUM> to move, so as to drive the circuit breaker to switch on and switch off. When the circuit breaker is in the switch-on state, the button limiting groove <NUM> is misaligned with the first locking member limiting protrusion 14a, and the first locking member limiting protrusion 14a is positioned in the switch-on button avoiding groove <NUM>, so the switch-off button <NUM> prevents the first locking member 1a from moving toward the inside of the circuit breaker housing <NUM>. When the circuit breaker is in the switch-off state, the button limiting groove <NUM> is arranged opposite to the first locking member limiting protrusion 14a, so the first locking member 1a can move toward the inside of the circuit breaker housing <NUM> under an external force of retraction, enabling the first locking member limiting protrusion 14a to slide into the button limiting groove <NUM>.

In this preferred example, the switch-on button <NUM> and the first locking member 1a are arranged on the same plane, and both positioned above the switch-off button <NUM>, so this solution makes the structure more compact. The switch-on button <NUM> is provided with the switch-on button avoiding groove <NUM> used to avoid the first locking member limiting protrusion 14a of the first locking member 1a, enabling the movement of the switch-on button <NUM> not to be interfered during its switch-on or switch-off operation. Moreover, the first locking member 1a can also abut against the switch-off button <NUM>, shortening the distance that the first locking member 1a needs to move for the unlocking and locking co-operation. The first locking member limiting protrusion 14a corresponds to the button limiting groove <NUM> of the switch-off button <NUM> during switch-off operation, so the first locking member 1a can retract into the circuit breaker housing <NUM>. The first locking member limiting protrusion 14a is misaligned with the button limiting groove <NUM> of the switch-off button <NUM> during switch-on operation, and the first locking member limiting protrusion 14a is limited by the switch-off button <NUM> in a position-limit way, so that the first locking member 1a cannot be pressed into the circuit breaker housing <NUM>, neither pulled out of the assembling position of the circuit breaker in the switch-on state.

Preferably, as shown in <FIG> and <FIG>, the circuit breaker of the present invention further includes an unlocking mechanism drivingly connected to the first locking member 1a. When the circuit breaker is in the switch-off state, operating the unlocking mechanism enables the first locking member 1a to move toward the inside of the circuit breaker housing <NUM>, and retract into the inside of the circuit breaker housing <NUM>, releasing its position-limiting co-operation with the assembling position housing and making its position-limiting co-operation with the button mechanism <NUM>. When the circuit breaker is in the switch-on state, the switch-on button <NUM> and/or the switch-off button <NUM> prevents the first locking member 1a from moving toward the inside of the circuit breaker housing <NUM>, ensuring that the first locking member 1a cannot be unlocked when the circuit breaker is in switch-on state, ensuring electrical safty.

Further, as shown in <FIG>, the unlocking mechanism includes the independent pulling member 2a drivingly co-operated with the first locking member 1a. When the circuit breaker is in the switch-off state, pulling the pulling member 2a enables the first locking member 1a to move towards the inside of the circuit breaker housing <NUM>, so as to release the position-limiting co-operation of the first locking member 1a with the assembling position housing. Further, as shown in <FIG>, the unlocking mechanism further includes the linkage member 3a and the lever support 4a arranged on the circuit breaker housing <NUM>. Of the linkage member 3a, one end is drivingly connected with the first locking member 1a, the other end is drivingly co-operated with the pulling member 2a, and the middle part is contacting co-operated with the lever support 4a. Pulling the pulling member 2a enables the linkage member 3a to rotate around the lever support 4a, and the linkage member 3a drives the first locking member 1a to move towards the inside of the circuit breaker housing <NUM> and release its position-limiting co-operation with the assembling position housing. As another example, the unlocking mechanism may not be provided with the lever support 4a, but the linkage member 3a may be rotationally installed inside the circuit breaker housing <NUM> through the couple between the waist-shaped hole arranged on the linkage member 3a and the linkage member shaft fixed on the circuit breaker housing <NUM>. Of the linkage member 3a, one end is co-operated with the first locking member 1a, and the other end is co-operated with the pulling member 2a. Pulling the pulling member 2a enables the linkage member 3a to rotate, and the other end of the linkage member 3a to act on the first locking member 1a, so that the first locking member 1a retracts into the circuit breaker housing <NUM>.

Compared with the existing circuit breaker which releases the position-limiting co-operation with the assembling position housing, the present invention has yet another improvement in that the circuit breaker is independently provided with the pulling member 2a of the unlocking mechanism, instead of unlocking the first locking member through the button mechanism, thereby avoiding the circuit breaker from being mistakenly pulled out by pulling the button. It should be pointed out that the independent pulling member 2a of the present invention is not only applicable to the solution of the switch-on button <NUM> and the switch-off button <NUM> of the present invention, but also can be used in the case that one button achieves the switch-on and switch-off operation.

It should be pointed out that, as an alternative embodiment, the first locking member 1a may not be provided with the first locking member limiting protrusion 14a, then regardless of whether the circuit breaker is in switches on or switches off state, the pulling member 2a can drive the first locking member 1a to move toward the inside of the circuit breaker housing <NUM>.

Preferably, as shown in <FIG>, the first embodiment of the first locking member 1a is provided.

As shown in <FIG>, the first locking member 1a includes the first locking member main body 10a, the first locking member sheltering protrusion 11a, the first locking member limiting protrusion 14a and the locking member's spring limiting structure 15a. The first locking member sheltering protrusion 11a and the first locking member limiting protrusion 14a are respectively arranged on both sides of the first locking member main body 10a. The locking member's spring limiting structure 15a is arranged on the side of the first locking member main body 10a far away from the locking member opening <NUM>. Of the first locking member main body 10a, one end protrudes outside the circuit breaker housing <NUM> through the locking member opening <NUM> arranged on the circuit breaker housing <NUM>, and the other end is connected to the first resetting spring 5a through the locking member's spring limiting structure 15a. Of the first resetting spring 5a, one end is co-operated with the locking member limiting structure 15a in a position-limit way, and the other end is co-operated with the circuit breaker housing <NUM> in a position-limit way. The first locking member sheltering protrusion 11a is co-operated with the circuit breaker housing <NUM> in a position-limit way to prevent the first locking member sheltering protrusion 11a from separating itself from the locking member opening <NUM>. Further, as shown in <FIG>, the first locking member 1a further includes the first locking member activated portion 130a connected with the linkage member 3a of the unlocking mechanism. The first locking member connecting hole 13a is arranged in the middle of the first locking member activated portion 130a, into which one end of the linkage member 3a is inserted. The first locking member activated portion 130a is arranged on one side of the first locking member main body 10a and between the first locking member main body 10a and the lever support 4a. Further, as shown in <FIG>, the locking member's spring limiting structure 15a is a spring limiting groove.

Preferably, as shown in <FIG>, the second embodiment of the first locking member 1a is provided.

As shown in <FIG>, the first locking member 1a of this example is different from that of the first embodiment in that no first locking member activated portion 130a protrudes, instead of that one end of the first locking member main body 10a protrudes outside the circuit breaker housing <NUM>, and one side of the other end is provided with the first locking member connecting hole 13a as the first locking member activated portion 130a. Further, as shown in <FIG>, the locking member's spring limiting structure <NUM> is a spring limiting protrusion. Obviously, the first locking member 1a can also be configured to be other similar structures as required.

Preferably, as shown in <FIG>, <FIG>, <FIG>, and <FIG>, multiple embodiments of the pulling member 2a are provided.

The pulling member 2a includes the pulling member operating portion 20a, the pulling member's first transition portion 21a and the pulling member driving portion 24a. The pulling member operating portion 20a is vertically connected with the pulling member's first transition portion 21a, and the pulling member driving portion 24a is obliquely connected to the pulling member's first transition portion 21a. The pulling member operating portion 20a constitutes an operating portion that eases pulling by hands or tools. The pulling member's first transition portion 21a is parallel to the movement direction of the pulling member 2a, constituting a sliding support, and the pulling member driving portion 24a is inclined, so as to actuate the linkage member 3a to drive the first locking member 1a to retract into the inside of the circuit breaker housing <NUM>. In an embodiment, the pulling member 2a only includes the pulling member operating portion 20a, the pulling member's first transition portion 21a and the pulling member driving portion 24a. Thus, the pulling member 2a constitutes an approximate Z-shaped structure or a U-shaped structure. The Z-shaped structure occupies a relatively large space, but the U-shaped structure has relatively poor stability of the sliding fit with the locking mechanism.

Further, in a preferred embodiment, as shown in <FIG>, the pulling member 2a also includes the pulling member's second transition portion 22a connected between the pulling member's first transition part 21a and the pulling member driving portion 24a. The pulling member's second transition portion 22a is parallel to the pulling member operating portion 20a and perpendicular to the pulling member's first transition part 21a. The pulling member's second transition portion 22a and the pulling member operating portion 20a are both positioned at one side of the pulling member's first transition part 21a to form a U-shape. The space occupied by the pulling member 2a can be reduced by bending, and the pulling member's second transition portion 22a can be used to pull the circuit breaker out and limit the position of the pulling member 2a. The pulling member driving portion 24a extends in the direction far away from the pulling member operating portion 20a and inclined and bent near one side of the pulling member's first transition part 21a.

Further, in a preferred embodiment, as shown in <FIG>, the pulling member 2a also includes: the pulling member's third transition portion 23a connected between the pulling member's second transition part 22a and the pulling member driving portion 24a, parallel to the pulling member's first transition part 21a, and used to balance the sliding of the pulling member 2a and adjust the position of the pulling member driving portion 24a; or/and the pulling member 2a further includes a pulling member maintaining portion 25a connected to the pulling member driving portion 24a and parallel to the pulling member's first transition portion 21a. The inclined pulling member driving portion 24a gradually actuates the linkage member 3a to drive the first locking member 1a to retract into the circuit breaker housing <NUM>, thus the pulling member maintaining portion 25a enables the first locking member 1a to remain at the retraction position by means of the linkage member 3a.

As shown in <FIG>, a preferred embodiment of the pulling member 2a is provided. The pulling member 2a includes the pulling member operating portion 20a, the pulling member's first transition portion 21a, the pulling member's second transition portion 22a, the pulling member's third transition part 23a, the pulling member driving portion 24a and the pulling member maintaining portion 25a, which are sequentially connected. The pulling member operating portion 20a is parallel to the pulling member's second transition portion 22a. The pulling member's first transition portion 21a and the pulling member's third transition part 23a are parallel to the pulling member maintaining portion 25a, and perpendicular to the pulling member operating portion 20a. The pulling member driving portion 24a is inclined, and has the end crookedly connected with the pulling member's third transition part 23a as the first end of the driving portion, and the end crookedly connected with the pulling member maintaining portion 25a as the second end of the driving portion. The first end of the driving portion is far away from the first locking member 1a relative to the second end of the driving portion. Further, the pulling member 2a is integrally formed by stamping and bending a metal material.

Preferably, as shown in <FIG>, the circuit breaker housing <NUM> further includes the pulling member limiting rib 6a arranged between the pulling member operating portion 20a and the pulling member's second transition portion 22a. After pulling the pulling member 2a has driven the first locking member 1a to retract into the circuit breaker housing <NUM> and release its position-limiting co-operation with the assembling position housing, continuously pulling the pulling member 2a enables it to be co-operated with the pulling member limiting rib 6a in a position-limit way, thus pull out the circuit breaker from the assembling position of the circuit breaker.

Specifically, as shown in <FIG>, <FIG>, of the first locking member 1a, the right end protrudes outside the circuit breaker housing <NUM>, and the left end is connected with the right end of the linkage member 3a and with the circuit breaker housing <NUM> through the first resetting spring 5a. Of the linkage member 3a, the middle part is contacting co-operated with the lever support 4a arranged above the first locking member 1a, and the left end is drivingly co-operated with the pulling member driving portion 24a. The upper end and the lower end of the pulling member driving portion 24a are the first end of the driving portion and the second end of the driving portion, respectively. When the circuit breaker is in the switch-off state, the pulling member 2a is being pulled upwards until the pulling member driving portion 24a touches the left end of the linkage member 3a (as shown in <FIG>). As shown in <FIG>, continuing to pull the pulling member 2a enables the linkage member 3a to rotate clockwise around the lever support 4a, then the right end of the linkage member 3a drives the first locking member 1a to move to the left, and the right end of the first locking member 1a to completely retract into the circuit breaker housing <NUM> and to be co-operated with the button mechanism <NUM> in a position-limit way, so as to release the first locking member 1a from its position-limiting co-operation with the assembling position housing, and enable the pulling member maintaining portion 25a to be co-operated with the left end of the linkage member 3a in a position-limit way, so that the first locking member 1a is kept inside the circuit breaker housing <NUM>.

Preferably, as shown in <FIG>, the pulling member 2a is made of metal magnetic material. The unlocking mechanism also includes the pulling member maintaining magnet arranged in the circuit breaker housing <NUM> and co-operated with the pulling member operating portion 20a. The pulling member maintaining magnet is installed in the groove <NUM> on the circuit breaker housing <NUM>, and magnetically co-operated with the pulling member operating portion 20a. The pulling member maintaining magnet can reliably hold the pulling member operating portion <NUM> inside the circuit breaker housing, keep the appearance of the circuit breaker clean and tidy at unnecessariness of operating the pulling member 2a, and avoid the pulling member 2a from undesiredly protruding from the circuit breaker housing, and causing misoperation or damage to the pulling member 2a. Further, when the pulling member 2a is operated to be pulled out to the designated position, the pulling member's second transition portion 22a can also keep its magnetical co-operation with the pulling member maintaining magnet, so that the pulling member can be kept at the pulled-out position outside the circuit breaker housing <NUM>.

It should be pointed out that the "magnetic co-operation" refers to the pulling member operating portion 20a being absorbed by the pulling member maintaining magnet. The content as said before as "the pulling member 2a is made of metallic magnetic material" means that the pulling member operating portion 20a can be magnetically absorbed by the pulling member maintaining magnet, but it does not have to be a magnet.

Preferably, as shown in <FIG>, <FIG>, <FIG> and <FIG>, the circuit breaker housing <NUM> further includes the wire-outlet hole <NUM> and the pulling member operating hole <NUM>. The wire-outlet hole <NUM>, the pulling member operating hole <NUM>, the switch-on button hole <NUM> and the switch-off button hole <NUM> are positioned on the same side wall of the circuit breaker housing <NUM>. The circuit breaker housing <NUM> also includes the pulling member' dig slot <NUM>. The pulling member operating portion 20a of the pulling member 2a is arranged inside the pulling member operating hole <NUM>, enabling the pulling member 2a not to protrude out of the circuit breaker housing <NUM> during no pulling out. The pulling member' dig slot <NUM> communicates with the pulling member operating hole <NUM>, and the pulling operation is performed by means of the pulling member' dig slot <NUM>.

Further, as a preferred solution, the pulling member' dig slot <NUM> is arranged between the wire-outlet hole <NUM> and the pulling member operating hole <NUM> and sheltered by a outlet wire, and the two ends of the pulling member' dig slot <NUM> communicates with the wire-outlet hole <NUM> and the pulling member operating hole <NUM>, respectively. Thus, only after the outlet wire is removed, the pulling member operating portion 20a can be dug out from the pulling member operating hole <NUM> at the pulling member' dig slot <NUM>. Alternatively, as another preferred solution, the pulling member' dig slot <NUM> is arranged between the switch-off button hole <NUM> and the pulling member operating hole <NUM>. Thus, when the circuit breaker is in the switch-on state, the switch-off button <NUM> shelters the pulling member' dig slot <NUM>; when the circuit breaker is in the switch-off state, only if the switch-off button <NUM> moves toward the inside of the circuit breaker housing <NUM> and leaves off the pulling member' dig slot <NUM>, the pulling member operating portion 20a can be dug out from the pulling member operating hole <NUM> at the pulling member' dig slot <NUM>. When the outlet wire is removed, the pulling member can be pulled out only if the circuit breaker is in the switch-off state. The arrangement of the above structure ensures that only when the circuit breaker is in the switch-off state, the unlocking mechanism can unlock the position-limiting cooperation between the first locking member 1a and the assembling position housing, avoiding the pulling member 2a from being damaged and the circuit breaker from being pulled out with electricity during pulling the pulling member 2a in the switch-on state and ensuring the electrical safety for users.

Preferably, as shown in <FIG>, in another embodiment of the pulling member, the pulling member 2a further includes the pulling member's spring limiting portion 26a. The pulling member's spring limiting portion 26a and the pulling member operating portion 20a are parallel to each other and positioned at both ends of the pulling member 2a, respectively. The unlocking mechanism further includes the pulling member resetting spring 7a arranged between the pulling member's spring limiting portion 26a and the pulling member limiting rib 6a. The pulling member resetting spring 7a can reliably keep the pulling member operating portion 20a of the pulling member 2a inside the circuit breaker housing. The pulling member's spring limiting portion 26a is crookedly connected to the pulling member maintaining portion 25a, or directly crookedly connected to the pulling member driving portion 24a.

Further, as shown in <FIG>, the pulling member 2a is stacked with the switch-on button <NUM> and the switch-off button <NUM> in the thickness direction of the circuit breaker to save space. The movement direction of the pulling member 2a is parallel to the movement direction of the switch-on button <NUM> and the switch-off button <NUM>, and perpendicular to the movement direction of the first locking member 1a, which moves in the width direction of the circuit breaker. The first transition portion 21a of the pulling member 2a abuts against the side wall on which the locking member opening <NUM> arranged of the circuit breaker housing <NUM> and moves along the side wall, and the first transition portion 21a is limited to slide between the pulling member limiting rib 6a and the lever support 4a in the movement direction, and restricted by one end of the pulling member limiting rib 6a and the circuit breaker housing <NUM> in the direction perpendicular to the movement direction. The first transition portion 21a and the first locking member 1a are arranged on both sides of the lever support 4a, respectively, and the linkage member 3a is positioned between the first locking member 1a and the lever support 4a. The pulling member 2a, the linkage member 3a and the first locking member 1a are all arranged on the switch-on button <NUM> and the switch-off button <NUM> in overlap in the thickness direction of the circuit breaker and positioned above the switch-on button <NUM> and the switch-off button <NUM>. The first locking member limiting protrusion 14a of the first locking member 1a protrudes and extends into the switch-on button avoiding groove <NUM> of the switch-on button <NUM>.

Preferably, the linkage member 3a is a Z or U-shaped pulling rod, one end of which is inserted on the first locking member 1a, and the other end of which extends in the sliding direction of the pulling member driving portion 24a of the pulling member 2a. The linkage member 3a drives the first locking member 1a to retract into the circuit breaker housing <NUM> by means of the lever support 4a as a rotational support. Its installation structure is quite simple, and the lever support 4a simultaneously performs the function of restricting the first locking member 1a and supporting the linkage member 3a.

Preferably, as shown in <FIG>, the locking mechanism further includes the second locking member 1b.

As shown in <FIG>, the second locking member 1b is pivotally arranged on the circuit breaker housing <NUM>, including the second locking end 13b. When the circuit breaker switches on, the switch-on button <NUM> or the switch-off button <NUM> drives the second locking member 1b to rotate (rotate in the second direction), enabling the second locking end 13b to protrude outside the circuit breaker housing <NUM>. When the circuit breaker switches off, the switch-on button <NUM> or the switch-off button <NUM> drives the second locking member 1b to rotate (rotate in the first direction), enabling the second locking end 13b to retract into the circuit breaker housing <NUM>.

Further, as a solution shown in <FIG>, the switch-on button <NUM> includes the switch-on button driving part <NUM> drivingly co-operated with the second locking member 1b, and the switch-off button <NUM> includes the switch-off button driving portion <NUM> drivingly co-operated with the second locking member 1b. As shown in <FIG>, when the circuit breaker switches on, the switch-off button <NUM> driving the second locking member 1b to rotate through the switch-off button driving portion <NUM> enables the second locking end 13b to protrude outside the circuit breaker housing <NUM>, and the switch-off button driving portion <NUM> withstanding the second locking end 13b enables the second locking end 13b not to retract into the circuit breaker housing <NUM>. As shown in <FIG>, when the circuit breaker switches off, the switch-on button <NUM> driving the second locking member 1b to rotate through the switch-on button driving portion <NUM> enables the second locking end 13b to retract into the circuit breaker housing <NUM>, and the switch-on button driving portion <NUM> restricting the second locking end 13b enables the second locking end 13b to be kept inside the circuit breaker housing <NUM>. Specifically, in the directions shown in <FIG>, when the circuit breaker switches on, the switch-off button <NUM> drives the second locking member 1b to rotate counterclockwise (rotate in the second direction), so that the second locking end 13b protrudes outside the circuit breaker housing <NUM>; as shown in <FIG>, when the circuit breaker switches off, the switch-on button <NUM> drives the second locking member 1b to rotate clockwise (rotate in the first direction), so that the second locking end 13b retracts into the circuit breaker housing <NUM>.

Preferably, as shown in <FIG>, the second locking member 1b includes the second locking member mounting portion 10b pivotally connected to the circuit breaker housing <NUM>, the locking member's first activated portion 11b drivingly co-operated with the switch-off button <NUM>, the locking member's second activated portion 12b drivingly co-operated with the switch-on button <NUM> and the second locking end 13b. When the circuit breaker switches on, the switch-off button <NUM> driving the second locking member 1b to rotate through the locking member's first activated portion 11b enables the second locking end 13b to protrude outside the circuit breaker housing <NUM>; when the circuit breaker switches off, the switch-on button <NUM> driving the second locking member 1b to rotate through the locking member's second activated portion 12b enables the second locking end 13b to retract into the circuit breaker housing <NUM>. In this example, the first activated portion 11b and the second locking end 13b are two cooperating ends; in another example, the second locking end 13b and the second locking end 13b may also be the one cooperating end. Further, as shown in <FIG>, the locking member's first activated portion 11b includes the locking member's first activated protrusion 110b protruding toward one side of the switch-off button <NUM>, and the locking member's second activated portion 12b includes the locking member's second activated protrusion 120b protruding toward one side of the switch-on button <NUM>. The locking member's first activated protrusion 110b and the locking member's second activated protrusion 120b are positioned at the same side of the second locking member 1b. When the circuit breaker switches on, one side of the switch-off button driving portion <NUM> driving the second locking member 1b to rotate through the locking member's first activated protrusion 110b enables the second locking end 13b to protrude outside the circuit breaker housing <NUM>; when the circuit breaker switches off, one side of the switch-on button driving portion <NUM> driving the second locking member 1b to rotate through the locking member's second activated protrusion 120b enables the second locking end 13b to retract into the circuit breaker housing <NUM>.

Further, as shown in <FIG>, the switch-on button driving portion <NUM> includes the switch-on button driving bevel <NUM> drivingly co-operated with the locking member's second activated protrusion 120b, and the switch-off button driving portion <NUM> includes the switch-off button driving bevel <NUM> drivingly co-operated with the locking member's first activated protrusion 110b. The tilt direction of the switch-on button driving bevel <NUM> is opposite to that of the switch-off button driving bevel <NUM>. The locking member's first activated protrusion 110b and the locking member's second activated protrusion 120b are positioned between the switch-off button driving bevel <NUM> and the switch-on button driving bevel <NUM>.

When pressing the switch-on button <NUM> enables the circuit breaker to switch on, the switch-on button driving bevel <NUM> moves toward the inside of the circuit breaker housing <NUM> along with the switch-on button <NUM> to leave off the second locking member 1b, meanwhile, the switch-off button driving bevel <NUM> moves toward the outside of the circuit breaker housing <NUM> along with the switch-off button <NUM>. The switch-off button driving bevel <NUM> driving the second locking member 1b to rotate through the locking member's first activated protrusion 110b enables the second locking end 13b to protrude outside the circuit breaker housing <NUM>, and the switch-off button driving bevel <NUM> withstanding the locking member's first activated protrusion 110b enables the second locking member 1b not to retract into the circuit breaker housing <NUM>.

When pressing the switch-off button <NUM> enables the circuit breaker to switch off, the switch-off button driving bevel <NUM> moves toward the inside of the circuit breaker housing <NUM> along with the switch-off button <NUM> to leave off the second locking member 1b, meanwhile, the switch-on button driving bevel <NUM> moves toward the outside of the circuit breaker housing <NUM> along with the switch-on button <NUM>. The switch-on button driving bevel <NUM> pressing down the locking member's second activated protrusion 120b enables the second locking end 13b to retract into the circuit breaker housing <NUM>, and the switch-on button driving bevel <NUM> restricting the second locking member 1b enables the latter to be kept inside the circuit breaker housing <NUM>. Further, as shown in <FIG>, the switch-on button driving bevel <NUM> is formed by the switch-on button driving protrusion arranged on the switch-on button <NUM>. The switch-off button driving bevel <NUM> is formed by the switch-off button driving protrusion groove arranged on the switch-off button <NUM>. When the circuit breaker is in the switch-off state, the switch-on button driving bevel <NUM> and the switch-off button driving bevel <NUM> form a funnel-shaped structure.

Preferably, as shown in <FIG>, the switch-off button driving portion <NUM> includes the switch-off button driving portion's first step <NUM> arranged on one side of the switch-off button <NUM>, and the switch-off button driving portion's second step <NUM> arranged on one side of the switch-off button driving portion's first step <NUM> far away from the switch-off button <NUM>. The switch-off button driving portion's first step <NUM> is shaped as a triangular structure in its entirety, and the switch-off button driving portion's second step <NUM> is arranged at a vertex angle of the triangular structure close to the switch-on button <NUM>.

Further, as shown in <FIG>, the second locking member 11b is shaped as an approximately H-shaped structure, and the second locking member mounting portion 10b and the locking member's first activated portion 11b are positioned at one end of the second locking member 1b, forming one transverse bar of the H-shaped structure, and the locking member's second activated portion 12b and the second locking end 13b are positioned at the other end of the second locking member 1b, forming the other transverse bar of the H-shaped structure.

Further, as shown in <FIG> and <FIG>, the second locking member 1b is stacked with the switch-on button <NUM> and the switch-off button <NUM> in the thickness direction of the circuit breaker to save space. In the thickness direction of the circuit breaker, the second locking member 1b is positioned above the switch-on button <NUM> and the switch-off button <NUM>, and the pulling member 2a is positioned above the second locking member 1b. The first locking member 1a is positioned above the second locking end 13b of the second locking member 1b, and one end of the first locking member 1a and the second locking end 13b share a large locking member opening <NUM>, of course, also may share two independent locking member openings. In the movement direction of the switch-on button <NUM> and the switch-off button <NUM>, the first locking member 1a is closer to the inside of the circuit breaker housing <NUM> than the second locking member 1b.

As shown in <FIG>, an embodiment of the circuit breaker housing <NUM> is provided.

As shown in <FIG>, the circuit breaker housing <NUM> is shaped as a hexahedral structure in its entirety, including the front side wall <NUM> and the rear side wall <NUM> arranged oppositely, the wire-outlet hole <NUM>, the button holes <NUM>-<NUM> and the pulling member operating hole <NUM> arranged on the front side wall <NUM>, and the wire-inlet hole <NUM> arranged on the rear side wall <NUM>.

Preferably, as shown in <FIG>, the button holes <NUM>-<NUM> include the switch-on button hole <NUM> and the switch-off button hole <NUM> arranged side by side. Further, the switch-on button operating end of the switch-on button <NUM> and the switch-off button operating end of the switch-off button <NUM> are slidingly arranged in the switch-on button hole <NUM> and the switch-off button hole <NUM>, respectively, and do not protrude out of the front side wall <NUM> of the circuit breaker housing <NUM> all along, thereby avoiding the circuit breaker from switching onswitching on/switching offswitching off due to users' accidental touch on the switch-on button operating end and the switch-off button operating end, and ensuring the stability and safety of the user's electricity consumption.

Preferably, as shown in <FIG>, the button holes <NUM>-<NUM> and the pulling member operating hole <NUM> are arranged at one end of the front side wall <NUM>, a wire-outlet hole <NUM> is arranged at the other end of the front side wall <NUM>, as the first wire-outlet hole, and the other wire-outlet hole <NUM> is arranged between the first wire-outlet hole and the button holes <NUM>-<NUM>, as the second wire-outlet hole. The button holes <NUM>-<NUM> and the second wire-outlet hole are positioned on the same side of the pulling member operating hole <NUM>. Further, as shown in <FIG>, the circuit breaker housing <NUM> further includes the pulling member' dig slot <NUM> arranged on the front side wall <NUM>. The pulling member' dig slot <NUM> is arranged between the second wire-outlet hole and the pulling member operating hole <NUM>, and its two ends communicate with the latter two, respectively. The outlet wire inserted in the second wire-outlet hole shelters the pulling member' dig slot <NUM>. Alternatively, as shown in <FIG>, the pulling member' dig slot <NUM> is arranged between the switch-off button hole <NUM> and the pulling member operating hole <NUM>. When the circuit breaker is in the switch-off state, the switch-off button <NUM> of the circuit breaker shelters the pulling member' dig slot <NUM>.

Preferably, as shown in <FIG>, the circuit breaker housing <NUM> further includes the wire-removing holes <NUM> arranged on the front side wall <NUM> and the communication hole <NUM> arranged on the rear side wall <NUM>. The wire-removing holes <NUM> is matched with the wire-outlet hole <NUM> one-to-one, and the communication hole <NUM> is positioned between the two wire-inlet holes <NUM>.

Preferably, as shown in <FIG>, the circuit breaker housing <NUM> further includes the third side wall <NUM> and the fourth side wall <NUM> arranged oppositely, and the fifth side wall <NUM> and the sixth side wall <NUM> arranged oppositely. The third side wall <NUM>, the fourth side wall <NUM>, the fifth side wall <NUM> and the sixth side wall <NUM> are all positioned between the front side wall <NUM> and the rear side wall <NUM>. Further, as shown in <FIG>, one end of the third side wall <NUM> close to the front side wall <NUM> is provided with the locking member opening <NUM>.

Claim 1:
A plug-in circuit breaker, comprising a circuit breaker housing (<NUM>), and a locking mechanism, an unlocking mechanism, a button mechanism (<NUM>) and an operating mechanism all arranged inside said circuit breaker housing (<NUM>); said operating mechanism connected to said button mechanism (<NUM>), said button mechanism (<NUM>) is operated to enable the circuit breaker to switch on/switch off by means of said operating mechanism; wherein
said locking mechanism includes a first locking member (1a) with one end protruding outside said circuit breaker housing (<NUM>), and said circuit breaker housing (<NUM>) includes a locking member opening (<NUM>) co-operated with said first locking member (1a);
characterized in that said unlocking mechanism includes a pulling member (2a) independent from the button mechanism (<NUM>) and drivingly co-operated with said first locking member (1a), when the circuit breaker is in a switch-off state, one end of said first locking member (1a) protrudes outside said circuit breaker housing (<NUM>) from said locking member opening (<NUM>), and said pulling member (2a) is accessible from outside said circuit breaker housing (<NUM>) so that pulling said pulling member (2a) enables said first locking member (1a) to retract into the inside of said circuit breaker housing (<NUM>).