Patent Description:
Circuit breakers can effectively improve the use safety of electrical equipment, and can be sorted into a plug-in type, a fixed-type and a drawer-type according to their installation ways. With the development of the electrical equipment's miniaturization, correspondingly, the overall structures and operation modes of the circuit breakers also have to be gradually upgraded. Among them, plug-in circuit breakers are widely used in communication equipment due to their advantages of compact structure, space saving and convenient installation. However, with the development of the IoT technology, the plug-in circuit breakers of the existing technology cannot meet the requirements of remote monitoring and control.

Patent <CIT> discloses a miniature circuit breaker, comprising a button mechanism, a circuit breaker housing, an operating mechanism, a movable contact and a static contact, but without an electric mechanism drivingly co-operated with the button mechanism or the operating mechanism.

The present invention, which is identified in the appended claims, aims to overcome the defects of the prior art, providing a circuit breaker, of which an electric mechanism realizes the remote control of the circuit breaker.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:
A circuit breaker, comprising a circuit breaker housing <NUM>; and a button mechanism <NUM>, an operating mechanism connected with the button mechanism <NUM>, a movable contact <NUM> connected with the operating mechanism, and a static contact <NUM> co-operated with the movable contact <NUM> are all arranged in said breaker housing <NUM>; operating the button mechanism <NUM> enables the circuit breaker to switch on /switch off by means of the operating mechanism; the circuit breaker further includes an electric mechanism 2c arranged inside the circuit breaker housing <NUM>, the electric mechanism 2c is drivingly co-operated with the button mechanism <NUM> or the operating mechanism, the electric mechanism 2c can actuate the circuit breaker to switch on /switch off by means of the operating mechanism, or the electric mechanism 2c can actuate the circuit breaker to switch on /switch off by means of the button mechanism <NUM>. The circuit breaker further includes a short-circuit protection mechanism <NUM> and an overload protection mechanism <NUM> arranged inside the circuit breaker housing <NUM> and respectively drivingly co-operated with the operating mechanism, arc extinguishing system <NUM>, a wire-inlet terminal 1i and a wire-outlet terminal 1o; the circuit breaker further includes an electric mechanism 2c drivingly co-operated with the button mechanism <NUM> or the operating mechanism; the wire-outlet terminal 1o and the button mechanism <NUM> are arranged at one end of the circuit breaker housing <NUM>, and the wire-inlet terminal 1i is arranged at the other end of the circuit breaker housing <NUM>; the operating mechanism is positioned between the button mechanism <NUM> and the wire-inlet terminal 1i; the arc extinguishing system <NUM> and the short-circuit protection mechanism <NUM> are arranged side by side between the operating mechanism and the wire-inlet terminal 1i; the electric mechanism 2c is positioned between the operating mechanism and the wire-outlet terminal 1o, and the electric mechanism 2c and the wire-outlet terminal 1o are positioned on the same side of the button mechanism <NUM>; the overload protection mechanism <NUM> is positioned on one side of the operating mechanism and between the arc extinguishing system <NUM> and the wire-outlet terminal 1o.

Preferably, the operating mechanism includes a bar linkage, and a transmission member <NUM> and a lever mechanism pivotally arranged on the circuit breaker housing <NUM>, the bar linkage includes a connecting rod structure <NUM> and a transmission connecting rod <NUM>, the button mechanism <NUM> is drivingly connected to the transmission member <NUM> through the connecting rod structure <NUM>, the transmission member <NUM> is drivingly connected to the lever mechanism through the transmission connecting rod <NUM>; and the lever mechanism is drivingly connected with the movable contact <NUM>; when operating the button mechanism <NUM> to enable the circuit breaker to switch on/switch off, the button mechanism <NUM> drives the transmission member <NUM> to rotate in a first direction/second direction through the connecting rod structure <NUM>, and said second direction and said first direction are opposite to each other.

Preferably, the button mechanism <NUM> includes a first button <NUM> slidably arranged inside the circuit breaker housing <NUM>, the connecting rod structure <NUM> includes a first connecting rod <NUM>, the first button <NUM> is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>; when pressing the first button <NUM> toward the inside of the circuit breaker housing <NUM> enables the circuit breaker to switch on, the first button <NUM> drives the transmission member <NUM> to rotate in the first direction; when pulling the first button <NUM> toward the outside of the circuit breaker housing <NUM> to enable the circuit breaker to switch off, the first button <NUM> drives the transmission member <NUM> to rotate in the second direction; the electric mechanism 2c is drivingly cooperated with the first button <NUM> to drive the circuit breaker to switch on/switch off.

Preferably, the button mechanism <NUM> includes a first button <NUM> and a second button <NUM> slidably arranged inside the circuit breaker housing <NUM> respectively, and the first button <NUM> and the second button <NUM> are parallelly arranged and synchronously move in two directions opposite to one another; the connecting rod structure <NUM> includes a first connecting rod <NUM> and a second connecting rod <NUM>, the first button <NUM> is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>, and the second button <NUM> is drivingly connected to the transmission member <NUM> through the second connecting rod <NUM>; when pressing the first button <NUM> toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on, the first button <NUM> drives the transmission member <NUM> to rotate in the first direction, meanwhile the second button <NUM> moves toward the outside of the circuit breaker; when pressing the second button <NUM> toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch off, the second button <NUM> drives the transmission member <NUM> to rotate in the second direction through the second connecting rod <NUM>, meanwhile the first button <NUM> moves toward the outside of the circuit breaker; the electric mechanism 2c drivingly cooperates with said first button <NUM> or said second button <NUM> to enable the circuit breaker to switch on/switch off.

Preferably, the electric mechanism 2c includes a driving motor 20c, a transmission gear set and a transmission rack 26c, the driving motor 20c is drivingly co-operated with the transmission rack 26c through the transmission gear set, and the transmission rack 26c is drivingly co-operated with the button mechanism <NUM>.

Preferably, the first button <NUM> includes a rack limiting groove <NUM> arranged on one side thereof, the transmission rack 26c is arranged in the rack limiting groove <NUM>, and the rack limiting groove <NUM> includes a switch-on side surface <NUM> and a switch-off side surface <NUM> respectively arranged at both ends thereof;
when the circuit breaker switches on, the transmission rack 26c moves from a first initial position toward the switch-on side surface <NUM> till said transmission rack 26c contacts with the latter, then the transmission rack 26c continues to move and drives the first button <NUM> to move toward the inside of the circuit breaker housing <NUM> through the switch-on side surface <NUM>, after the circuit breaker has switched on, the transmission rack 26c returns back to the first initial position; when the circuit breaker switches off, the transmission rack 26c moves toward the switch-off side surface <NUM> to contact with the latter, then the transmission rack 26c continues to move and drives the first button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the switch-off side surface <NUM>, after the circuit breaker has broken contact, the transmission rack 26c returns to the first initial position.

Preferably, the first button <NUM> and the transmission rack 26c are fixedly connected to each other, and the transmission gear set includes a first fan-shaped gear 251c drivingly engaged with the transmission rack 26c;
when the circuit breaker switches on, the first fan-shaped gear 251c rotates in the first direction and drives the first button <NUM> to move toward the inside of the circuit breaker housing <NUM> through the transmission rack 26c, thus the circuit breaker switches on and the first fan-shaped gear 251c rotates to its disengagement from the transmission rack 26c; when the circuit breaker switches off, the first fan-shaped gear 251c rotates in the second direction and drives the first button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the transmission rack 26c, thus the circuit breaker switches off and the first fan-shaped gear 251c rotates to its disengagement from the transmission rack 26c.

Preferably, the electric mechanism 2c is drivingly co-operated with the transmission member <NUM> to drive the circuit breaker to switch on/switch off, the electric mechanism 2c includes a motor 20c, a transmission gear set and a transmission member's gear 27c coaxially arranged with the transmission member <NUM>, and the transmission gear set includes a switch-on and switch-off driving gear drivingly co-operated with the transmission member's gear 27c;
the switch-on and switch-off driving gear drives the transmission member's gear 27c to rotate, and the transmission member's gear 27c drives the transmission member <NUM> to rotate, so as to enable the circuit breaker to switch on/switch off.

Preferably, the operating mechanism further includes a jump buckle <NUM>, a lock catch <NUM> and a rotating plate <NUM> pivotally arranged on the circuit breaker housing <NUM>, the jump buckle <NUM> and the lock catch <NUM> are pivotally arranged on the rotating plate <NUM>, respectively, the jump buckle <NUM> and the lock catch <NUM> are locked with each other, and the rotating plate <NUM> is drivingly connected with the movable contact <NUM>;.

Preferably, the circuit breaker further includes a control circuit board 1c connected to the electric mechanism 2c; the control circuit board 1c is arranged between the bottom plate of the circuit breaker housing <NUM> and the electric mechanism 2c, the control circuit board 1c and the electric mechanism 2c are positioned on the same side of the button mechanism <NUM>, and the control circuit board 1c is positioned between the wire-outlet terminal 1o and the operating mechanism.

Preferably, the circuit breaker further includes a control circuit board 1c connected to the electric mechanism 2c; the bottom plate of the circuit breaker housing <NUM> is positioned on one side of the control circuit board 1c, and the electric mechanism 2c, the operating mechanism and the arc extinguishing system <NUM> are positioned on the other side of the control circuit board 1c.

Preferably, the button mechanism <NUM> is arranged opposite to the short-circuit protection mechanism <NUM> and positioned on one side of the circuit breaker housing <NUM>; the wire-outlet terminal 1o is arranged opposite to the arc extinguishing system <NUM> and positioned on the other side of the circuit breaker housing <NUM>.

Preferably, the short-circuit protection mechanism <NUM> is an electromagnetic release; the overload protection mechanism <NUM> is a bimetallic strip drivingly co-operated with the jump buckle <NUM> of the operating mechanism, or the overload protection mechanism <NUM> is a current transformer coupled to the L-pole circuit of the circuit breaker and connected to the control circuit board 1c, or the overload protection mechanism <NUM> is a manganin resistor in series connection with the L-pole circuit of the circuit breaker, and the manganin resistor is connected to the control circuit board 1c; the circuit breaker further includes the control circuit board 1c connected to the electric mechanism 2c and a signal terminal connected to the control circuit board 1c, the signal terminal and the wire-inlet terminal 1i are arranged at the same end of the circuit breaker housing <NUM>, and the signal terminal is positioned between the two wire-inlet terminals 1i.

The circuit breaker of the present invention comprises a button mechanism, an operating mechanism, an electric mechanism, and the electric mechanism being drivingly co-operated with the button mechanism or the operating mechanism, users can either manually operate the button mechanism to drive the circuit breaker to switch on/switch off, or actuate the circuit breaker to switch on/switch off by means of the co-operation of the electric mechanism and the operating mechanism or the co-operation of the electric mechanism and the button mechanism. Firstly, the operation method of the circuit breaker is diversified; secondly, the electric mechanism enables the circuit breaker to be remotely controlled.

In addition, the circuit breaker of the present invention includes a first button and a second button, which correspond to the switch-on and switch-off operations of the circuit breaker, respectively, and which bring about the following advantages. Users can judge the switch-on/switch-off state of the circuit breaker by observing the states of the two buttons (that is, when the first button is pressed down and the second button comes up, the circuit breaker is in the switch-on state; when the first button comes up and the second button is pressed down, the circuit breaker is in the switch-off state). Compared with the existing circuit breakers which switches off by pulling button, the circuit breaker of the present invention enables the circuit breaker to switch on and switch off by pressing the first button and the second button respectively, thus preventing the circuit breaker from being pulled out from the assembling position of the circuit breaker (such as a cabinet, etc.) due to the excessive force of pulling the buttons.

In addition, a wire-inlet terminal and a wire-outlet terminal are arranged at both ends of the circuit breaker housing respectively, helping to increase the creepage distance between the two terminals and improve the electrical safety of circuit breakers. The electric mechanism is positioned between the operating mechanism and the wire-out terminal, and the electric mechanism and the wire-out terminal are positioned on the same side of the button mechanism. The internal space of the circuit breaker housing is reasonably designed, and the layout of each part is compact, enabling the internal space of the circuit breaker housing to be utilized to the greatest extent, and helping to reduce the overall volume of the circuit breaker.

In addition, the bottom plate of the circuit breaker housing is positioned on one side of the control circuit board, and the electric mechanism, button mechanism, operating mechanism, short-circuit protection mechanism and the arc extinguishing system are positioned on the other side of the control circuit board; the above-mentioned stacking arrangement enables the control circuit board to take enough assembly space, so as to increase the size of the control circuit board, and abate the difficulty of arranging components on the control circuit board and the complexity of wiring on the control circuit board; more importantly, directly connecting to the wire-inlet terminal through the conductive lines arranged on the control circuit board excludes the difficulty of welding and wiring caused by the connection of separate flexible wires, and the control circuit board enables the circuit breaker to be remotely monitored and controlled.

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

The circuit breaker of the present invention includes the circuit breaker housing <NUM>, the button mechanism <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>, which are arranged in the circuit breaker housing <NUM> respectively; and the button mechanism <NUM> is operated to enable the circuit breaker to switch on /switch off by means of the operating mechanism; the circuit breaker also includes the electric mechanism 2c arranged in the circuit breaker housing <NUM>; the electric mechanism 2c is drivingly co-operated with the button mechanism <NUM> or the operating mechanism; the electric mechanism 2c can actuate the circuit breaker to switch on /switch off by means of the operating mechanism, or the electric mechanism 2c can actuate the circuit breaker to switch on /switch off by means of the cooperation of the button mechanism <NUM> and the operating mechanism. The circuit breaker of the present invention includes the button mechanism <NUM>, the operating mechanism, the electric mechanism 2c, and the electric mechanism 2c being drivingly co-operated with the button mechanism <NUM> or the operating mechanism; users can either manually operate the button mechanism <NUM> to drive the circuit breaker to switch on/switch off, or actuate the circuit breaker to switch on/switch off by means of the co-operation of the electric mechanism 2c and the operating mechanism or the co-operation of the electric mechanism 2c and the button mechanism <NUM>. Firstly, the operation method of the circuit breaker is diversified; secondly, the electric mechanism 2c enables the circuit breaker to be remotely controlled.

Further, as a preferred solution of the present invention, the button mechanism <NUM> includes the first button <NUM> and the second button <NUM> respectively slidably arranged inside the circuit breaker housing <NUM>; the operating mechanism includes a bar linkage, and the transmission member <NUM> and the lever mechanism pivotally arranged on the circuit breaker housing <NUM>; the bar linkage includes the connecting rod structure <NUM> and the transmission connecting rod <NUM>, and the connecting rod structure <NUM> includes the first connecting rod <NUM> and the second connecting rod <NUM>; the first button <NUM> is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>, the second button <NUM> is drivingly connected to the transmission member <NUM> through the second first connecting rod <NUM>, the transmission member <NUM> is drivingly connected to the lever mechanism through the transmission connecting rod <NUM>, and the lever mechanism is drivingly connected with the movable contact <NUM>; when pressing the first button <NUM>/second button <NUM> toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on/switch off, the first button <NUM>/second button <NUM> drives the transmission member <NUM> to rotate in a first direction/a second direction through the first connecting rod <NUM>/the second connecting rod <NUM>, and the second direction and the first direction are opposite to each other. The circuit breaker of the present invention includes the first button <NUM> and the second button <NUM>, which correspond to the switch-on and switch-off operations of the circuit breaker, respectively, and which bring about the following advantages: <NUM>. Users can judge the switch-on/ switch-off state of the circuit breaker by observing the states of the two buttons (that is, when the first button <NUM> is pressed down and the second button <NUM> comes up, the circuit breaker is in the switch-on state; when the first button <NUM> comes up and the second button <NUM> is pressed down, the circuit breaker is in the switch-off state). Compared with the existing circuit breakers which switch off by pulling button, the circuit breaker of the present invention enables the circuit breaker to switch on and switch off by pressing the first button <NUM> and the second button <NUM> respectively, thus preventing the circuit breaker from being pulled out from the assembling position of the circuit breaker (such as a cabinet, etc.) due to the excessive force on pulling the buttons.

The circuit breaker of the present invention further includes the short circuit protection mechanism <NUM>, the overload protection mechanism <NUM>, the arc extinguishing system <NUM>, the wire-inlet terminal 1i and the wire-outlet terminal 1o all arranged in the circuit breaker housing <NUM>; the short-circuit protection mechanism <NUM> and the overload protection mechanism <NUM> are drivingly co-operated with the operating mechanism respectively; the wire-outlet terminal 1o and the button mechanism <NUM> are arranged at one end of the circuit breaker housing <NUM>, and the wire-inlet terminal 1i is arranged at the other end of the circuit breaker housing <NUM>; the operating mechanism is positioned between the button mechanism <NUM> and the wire-inlet terminal 1i; the arc extinguishing system <NUM> and the short-circuit protection mechanism <NUM> are arranged side by side between the operating mechanism and the wire-inlet terminal 1i; the electric mechanism 2c is positioned between the operating mechanism and the wire-outlet terminal 1o, and the electric mechanism 2c and the wire-outlet terminal 1o are positioned on the same side of the button mechanism <NUM>; the overload protection mechanism is positioned on one side of the operating mechanism and between the arc extinguishing system <NUM> and the wire-outlet terminal 1o. Of the present invention, the wire-inlet terminal 1i and the wire-outlet terminal 1o are arranged at both ends of the circuit breaker housing <NUM> respectively, helping to increase the creepage distance between the two terminals and improve the electrical safety of circuit breakers, the electric mechanism 2c is positioned between the operating mechanism and the wire-out terminal 1o, and the electric mechanism 2c and the wire-out terminal 1o are positioned on the same side of the button mechanism <NUM>, so that the internal space of the circuit breaker housing <NUM> is reasonably designed, and the layout of each part is compact, enabling the internal space of the circuit breaker housing <NUM> to be utilized to the greatest extent, and helping to reduce the overall volume of the circuit breaker.

Further, the circuit breaker of the present invention also includes the control circuit board 1c connected to the electric mechanism 2c, the bottom plate of the circuit breaker housing <NUM> is positioned on one side of the control circuit board 1c, and the electric mechanism 2c, the operating mechanism and the arc extinguishing system <NUM> are positioned on the other side of the control circuit board 1c. The above-mentioned stacking arrangement enables the control circuit board 1c to take enough assembly space, so as to increase the size of the control circuit board 1c, and abate the difficulty of arranging components on the control circuit board 1c and the complexity of wiring process on the control circuit board 1c. More importantly, directly connecting to the wire-inlet terminal 1i by means of the conductive lines arranged on the control circuit board 1c excludes the difficulty of welding and wiring caused by the connection of separate flexible wires.

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

As shown in <FIG>, <FIG>, the circuit breaker of the present invention includes 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, so as to enable the movable contact <NUM> and the static contact <NUM> to be connected/disconnected.

Preferably, as shown in <FIG>, the operating mechanism includes the bar linkage, and the transmission member <NUM> and the lever mechanism pivotally arranged on the circuit breaker housing <NUM>; the bar linkage includes the connecting rod structure <NUM> and the transmission connecting rod <NUM>; the button mechanism <NUM> is drivingly connected to the transmission member <NUM> through the connecting rod structure <NUM>, the transmission member <NUM> is drivingly connected to the lever mechanism through the transmission connecting rod <NUM>, and the lever mechanism is drivingly connected with the movable contact <NUM>; when operating the button mechanism <NUM> to enable the circuit breaker to switch on/switch off, the button mechanism <NUM> drives the transmission member <NUM> to rotate in a first direction/second direction through the connecting rod structure <NUM>, and the second direction and the first direction are opposite to each other; the electric mechanism 2c is drivingly co-operated with the button mechanism <NUM> or the transmission member <NUM>.

Preferably, as shown in <FIG>, the lever mechanism includes the jump buckle <NUM>, the lock catch 51and the rotating plate <NUM> pivotally arranged on the circuit breaker housing <NUM>, the jump 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 drivingly connected with the movable contact <NUM>. It should be pointed that the lever mechanism may adopt a four-bar linkage and other multi-bar linkages, as they pertain to the prior art in the art, details for them are not described herein again.

Specifically, as shown in <FIG>, the first direction is a clockwise direction, and the second direction is a counterclockwise direction.

Preferably, as shown in <FIG>, an embodiment is provided, of which the button mechanism <NUM> only includes one button. The button mechanism <NUM> includes the first button <NUM> slidably arranged inside the circuit breaker housing <NUM>, the connecting rod structure <NUM> includes the first connecting rod <NUM>, the first button <NUM> is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>; when pressing the first button <NUM> toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on, the first button <NUM> drives the transmission member <NUM> to rotate in a first direction; when pulling the first button <NUM> toward the outside of the circuit breaker housing <NUM> to enable the circuit breaker to switch off, the first button <NUM> drives the transmission member <NUM> to rotate in a second direction. Further, as shown in <FIG>, of the first button <NUM>, one end protrudes outside the circuit breaker housing <NUM>, and the other end is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>; when pressing down the first button <NUM> to enable the circuit breaker to switch on, the first button <NUM> drives the transmission member <NUM> to rotate clockwise through the first connecting rod <NUM>; when pulling up the first button <NUM> to enable the circuit breaker to switch off, the first button <NUM> drives the transmission member <NUM> to rotate counterclockwise through the first connecting rod <NUM>.

Preferably, as shown in <FIG>, <FIG>, <FIG> and <FIG>, another embodiment is provided, of which the button mechanism <NUM> includes two buttons, which is a preferred solution of the present invention. The button mechanism <NUM> includes the first button <NUM> and the second button <NUM> all slidably arranged inside the circuit breaker housing <NUM>, and the first button <NUM> and the second button 21are parallelly arranged and synchronously move in two directions opposite to one another; the connecting rod structure <NUM> includes the first connecting rod <NUM> and the second connecting rod <NUM>, the first button <NUM> is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>, and the second button <NUM> is drivingly connected to the transmission member <NUM> through the second connecting rod <NUM>; when pressing the first button <NUM> toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch on, the first button <NUM> drives the transmission member <NUM> to rotate in the first direction, meanwhile the second button <NUM> moves toward the outside of the circuit breaker; when pressing the second button <NUM> toward the inside of the circuit breaker housing <NUM> to enable the circuit breaker to switch off, the second button <NUM> drives the transmission member <NUM> to rotate in the second direction through the second connecting rod <NUM>, meanwhile the first button <NUM> moves toward the outside of the circuit breaker.

The basic processes of the circuit breaker normally switching on, normally switching off and switching off with fault in the present invention are shown as follows.

As shown in <FIG>, the circuit breaker is in the switch-off state. During the switch-on operation, pressing down the first button <NUM> enables the first button <NUM> to drive the transmission member <NUM> to rotate clockwise through the first connecting rod <NUM>, and the transmission member <NUM> drives lever mechanism to rotate clockwise in its entirety through the transmission connecting rod <NUM>; thus the lever mechanism drives the movable contact <NUM> to sway clockwise to join the movable contact <NUM> to the static contact <NUM>, the circuit breaker finishes switching on (as shown in <FIG>), meanwhile the second button <NUM> moves toward the outside of the circuit breaker. As shown in <FIG>, the circuit breaker is in the switch-on state. During the switch-off operation, pressing down the second button <NUM> enables the second button <NUM> to drive the transmission member <NUM> to rotate counterclockwise through the second connecting rod <NUM>, the transmission member <NUM> drives the jump buckle <NUM> and the lock catch <NUM> to release the locking co-operation between them through the transmission connecting rod <NUM>, the rotating plate <NUM> drives the movable contact <NUM> to sway counterclockwise to separate the movable contact <NUM> from the static contact <NUM>, the circuit breaker finishes switching off (as shown in <FIG>), meanwhile the first button <NUM> moves toward the outside of the circuit breaker.

When a short-circuit or overload fault occurs in the circuit breaker, the short-circuit protection mechanism <NUM> or the overload protection mechanism <NUM> drives the lock catch <NUM> to rotate counterclockwise, so that the jump buckle <NUM> and the lock catch <NUM> are released from each other; the rotating plate <NUM> drives the movable contact <NUM> to sway counterclockwise, to separate the movable contact <NUM> from the static contact <NUM>, so that the circuit breaker switches off (as shown in <FIG>).

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> arranged in the middle thereof, and the first connection hole <NUM>, the second connection hole <NUM>, and the third connection hole <NUM> all arranged around the transmission member axle hole <NUM>. The first connection hole <NUM>, the second connection hole 41and the third connection hole <NUM> are positioned at three vertices of a triangle thereon, respectively. The second connection hole <NUM> is arranged at one end of the transmission member <NUM>, and the first connection hole <NUM> and the third connection hole <NUM> are arranged at the other end of the transmission member <NUM>. Specifically, in the directions shown in <FIG>, The transmission member axle hole <NUM> is arranged in the middle of the transmission member <NUM>, the second connection hole <NUM> is arranged at the left end of the transmission member <NUM> and positioned on the left side of the transmission member axle hole <NUM>, and the first connection hole <NUM> and the third connection hole <NUM> are arranged at the right end of the transmission member <NUM> and positioned on the right side of the transmission member axle hole <NUM>.

Preferably, as shown in <FIG>, the circuit breaker of the present invention further includes the first locking member 1a with one end protruding outside the circuit breaker housing <NUM>; the circuit breaker housing <NUM> includes the locking member opening co-operated with the first locking member 1a, and the first resetting spring 5a drives one end of the first locking member 1a to protrude outside the circuit breaker housing <NUM> through the locking member opening; 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, and after retracting into the inside of the circuit breaker housing <NUM>, the first locking member 1a can be co-operated with the first button <NUM> and/or the second button <NUM> in a position-limit way and enables the circuit breaker not to switch on; when the circuit breaker is in the switch-on state, the first locking member 1a protrudes outside the circuit breaker housing <NUM>, and the first locking member 1a is limited by the first button <NUM> and/or the second button <NUM> in a position-limit way and cannot retract into the circuit breaker housing <NUM>. For example, while the circuit breaker is being installed to the assembling position for the circuit breaker in the switch-off state, the assembling position housing for the circuit breaker squeezes the first locking member 1a to enable it move toward the inside of the circuit breaker housing <NUM> (the assembling position housing applies a external force for retraction on the first locking member 1a) during this assembling process, so as to enable the first locking member 1a to be co-operated with the first button <NUM> and/or the second button <NUM> in a position-limit way, and lock the first button <NUM> and/or the second button <NUM>; after the circuit breaker has been assembled to the designated position, the locking member opening corresponds to the assembling limiting hole of the assembling position housing, so the first locking member 1a protrudes outside the circuit breaker housing <NUM> again and releases its position-limiting co-operation with the first button <NUM> and/or the second button <NUM>, and the first button <NUM> and/or the second button <NUM> being unlocked and co-operating the first locking member 1a with the assembling position housing in a position-limit way enable the circuit breaker to normally switch on and switch off through the first button <NUM> and/or the second button <NUM>, and prevent the circuit breaker from being pulled out from its assembling position at will.

Further, as shown in <FIG>, the circuit breaker further includes an unlocking mechanism, and the unlocking mechanism includes the independent pulling member 2a arranged inside the circuit breaker housing <NUM> and drivingly co-operated with the first locking member 1a; when the circuit breaker is in the switch-off state, the pulling member 2a is pulled out of the circuit breaker housing <NUM>, thus the pulling member 2a drives the first locking member to move toward the inside of the circuit breaker housing <NUM> against the elastic force of the first resetting spring 5a, retract into the inside of the circuit breaker housing, release its position-limiting co-operation with the assembling position housing, and co-operate with the first button <NUM> and/or the second button <NUM> in a position-limit way; at this time, further pulling the pulling member 2a enables the circuit breaker to be pulled out from the assembling position of the circuit breaker. When the circuit breaker is in the switch-on state, the first button <NUM> and/or the second button <NUM> prevent the first locking member 1a from moving toward the inside of the circuit breaker housing <NUM>, and at this time, the first locking member 1a cannot retract into the inside of the circuit breaker the housing <NUM> through the unlocking mechanism. 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; the pulling member 2a is pulled toward the outside of the circuit breaker housing <NUM>, thus the pulling member 2a drives the linkage member 3a to rotate around the lever support 4a, and the linkage member 3a drives the first locking member 1a to move toward the inside of the circuit breaker housing <NUM> and release its position-limiting co-operation with the assembling position housing. Further, as shown in <FIG>, the pulling member 2a is placed on one side of the button mechanism <NUM> in overlap in the thickness direction of the circuit breaker housing <NUM>, helping to improve the compactness of the circuit breaker structure. Further, as shown in <FIG> and <FIG>, the movement direction of the pulling member <NUM> is parallel to the movement direction of the first button <NUM> and the second button <NUM>, and perpendicular to the movement direction of the first locking member 1a.

Preferably, the first button <NUM> and/or the second button <NUM> is provided with a locking member limiting groove, and the first locking member 1a is provided with a locking member limiting protrusion; when the circuit breaker switches on, the movement of the first button <NUM> and the second button <NUM> enables the locking member limiting groove to be misaligned with the locking member limiting protrusion, and the locking member limiting protrusion cannot slide into the locking member limiting groove; when the circuit breaker switches off, the movement of the first button <NUM> and the second button <NUM> causes the locking member limiting groove and the locking member limiting protrusion to be opposite to each other, and the pulling member <NUM> is pulled to drive the first locking member 1a to move toward the inside of the circuit breaker housing <NUM>, so as to enable the locking member limiting protrusion to slide into the locking member limiting groove, and the first locking member 1a to lock the first button <NUM> and/or or the second button <NUM>, so that the circuit breaker cannot switch on.

As shown in <FIG>, the first embodiment of the circuit breaker of the present invention is provided.

As shown in <FIG>, <FIG>, the button mechanism <NUM> of the circuit breaker of this embodiment includes the first button <NUM> and the second button <NUM>; the electric mechanism 2c includes the driving motor 20c, the transmission gear set and the transmission rack 26c; the driving motor 20c is drivingly co-operated with the transmission rack 26c through the transmission gear set, and the transmission rack 26c is drivingly co-operated with the first button <NUM>. Further, as shown in <FIG>, the first button <NUM> includes the rack limiting groove <NUM> arranged on one side thereof, the transmission rack 26c is arranged in the rack limiting groove <NUM>, and the rack limiting groove <NUM> includes the switch-on side surface <NUM> and the switch-off side surface <NUM> respectively arranged at both ends thereof; the driving motor 20c drives the transmission rack 26c to slide in the rack limiting groove <NUM>, and drives the first button <NUM> through the switch-on side surface <NUM> and the switch-off side surface <NUM> to enable the circuit breaker to switch on/switch off; when the circuit breaker switches on, the transmission rack 26c moves from the first initial position toward the switch-on side surface <NUM> till the transmission rack 26c contacts with the latter, then the transmission rack 26c continues to move and drives the first button <NUM> to move toward the inside of the circuit breaker housing <NUM> through the switch-on side surface <NUM>; after the circuit breaker has switched on, the transmission rack 26c returns back to the first initial position; when the circuit breaker switches off, the transmission rack 26c moves toward the switch-off side surface <NUM> to contact with the latter, then the transmission rack 26c continues to move and drives the first button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the switch-off side surface <NUM>; after the circuit breaker has switched off, the transmission rack 26c returns back to the first initial position. In the circuit breaker of the present invention, the electric mechanism 2c performs the switch-on/switch-off operation through the cooperation of the transmission rack 26c and the button mechanism, and after completing the switch-on/switch-off operation, the electric mechanism 2c continues to drive the transmission rack 26c to return back to the first initial position without interference with the first button <NUM>. Firstly, users can still manually perform the switch-on/switch-off operation on the circuit breaker; secondly, when the circuit breaker trips off due to a short circuit or overload fault, the transmission rack 26c will not affect the operation of the operating mechanism, ensuring the protection performance of the circuit breaker. It should be pointed out that the transmission rack 26c is not limited to co-operate with the first button <NUM>, as wells as cooperates with the second button <NUM>, and the rack limiting groove <NUM> is arranged on one side of the second button <NUM>. Thus, when the circuit breaker switches on/switches off, the movement direction of the transmission rack 26c is opposite to that of the transmission rack 26c in the first embodiment.

We shall further describe the switch-on/switch-off process of the circuit breaker in this embodiment with reference to <FIG> and <FIG> as follows.

As shown in <FIG> and <FIG>, the upper side wall of the circuit breaker housing <NUM> serves as the operation interface; as shown in <FIG>, of the first button <NUM>, moving toward the operation interface corresponds to moving toward the outside of the circuit breaker housing <NUM>, and moving away from the operation interface corresponds to moving toward the inside of the circuit breaker housing <NUM>;Specifically, as shown in <FIG>, while the circuit breaker is in the switch-off state, the transmission rack 26c is at the first initial position, and the driving motor 20c drives the transmission rack 26c to move rightwards to contact with the switch-on side surface <NUM> of the rack limiting groove <NUM>, thus the transmission rack 26c is driven to continue to move rightwards and drives the first button <NUM> to move rightwards through the switch-on side surface <NUM>; as shown in <FIG>, the circuit breaker completes switching on, and the transmission rack 26c is driven to move leftwards to the first initial position (as shown in <FIG>); as shown in <FIG>, while the circuit breaker is in the switch-on state, the transmission rack 26c is at the first initial position, and the driving motor 20c drives the transmission rack 26c to move leftwards to contact with the switch-off side surface <NUM> of the rack limiting groove <NUM>; as shown in <FIG>, the transmission rack 26c is driven to continue to move leftwards and drives the first button <NUM> to move leftwards through the switch-off side surface <NUM>; as shown in <FIG>, the circuit breaker completes switching off, and the transmission rack 26c is driven to move rightwards to the first initial position.

Preferably, as shown in <FIG>, the circuit breaker housing <NUM> includes the first button hole, the second button hole and the track groove <NUM> all arranged thereon. One end of the first button <NUM> is slidably arranged in the first button hole, and one end of the second button <NUM> is slidably arranged in the second button hole. The first button <NUM> includes the first button's track protrusion <NUM> arranged at the other end thereof, and the first button's track protrusion <NUM> is slidably arranged in the track groove <NUM>; the transmission rack 26c includes the rack track bar 261c arranged on one side thereof, and the rack track bar 261c is slidably arranged in the rail groove <NUM>. Further, as shown in <FIG>, the circuit breaker housing <NUM> includes the first rib <NUM>, and the track groove <NUM> is arranged in the middle of the first rib <NUM> and extends in the length direction of the first rib <NUM>. Further, as shown in <FIG>, the first button <NUM> further includes the second button's track bar <NUM> arranged thereon and extending in the length direction of the first button <NUM>. As shown in <FIG>, the second button <NUM> includes the second button's track portion <NUM>, and one side of the second button's track portion <NUM> facing the first button <NUM> is provided with the second button's track groove. The second button's track groove is slidably co-operated with the second button's track bar <NUM>.

Specifically, as shown in <FIG>, the side of <FIG> facing the reader serves as the front side of the circuit breaker; the first rib <NUM> is arranged on the bottom plate of the circuit breaker housing <NUM>, and the first button hole is arranged on the upper side wall of the circuit breaker housing; of the first button <NUM>, the upper end of is slidably arranged in the first button hole, and the first button rail protrusion <NUM> of the lower end is slidably arranged in the track groove <NUM>. The arrangements of the transmission rack 26c on the front side of the first rib <NUM>, the first button <NUM> on the front side of the transmission rack 26c, and the second button's track portion <NUM> on the front side of the first button <NUM> form the reliable position-limiting co-operation of the transmission rack 26c with the track groove <NUM>, the first button <NUM> with the track groove <NUM>, the first button <NUM> with the transmission rack 26c, and the second button <NUM> with the first button <NUM>, ensuring the operational reliability of the operating mechanism.

Preferably, as shown in <FIG>, the transmission gear set includes the worm wheel 21c drivingly connected to the driving motor 20c, the first transmission gear 22c meshing with the worm wheel 21c, the second transmission gear 23c is coaxial linkage with the first transmission gear 22c, the third upper transmission gear 240c meshing with the second transmission gear 23c, the third lower transmission gear 241c is coaxial linkage with the third upper transmission gear 240c, and the driving gear 25c meshing with the third lower transmission gear 241c. The driving gear 25c meshes with the transmission rack 26c. It should be pointed out that the transmission gear set may increase or decrease as required.

Preferably, as shown in <FIG>, an embodiment of the transmission rack 26c is provided.

The transmission rack 26c in a strip-shape is slidably arranged inside the circuit breaker housing <NUM>, including the transmission rack block 260c, the rack arranged on one side of the transmission rack block 260c and co-operated with the transmission gear set, and rack track bar 261c arranged on another side of the transmission rack block 260c. Preferably, the sliding direction of the transmission rack 26c is parallel to the first button <NUM> and the second button <NUM>, and the transmission rack 26c is arranged between the first button <NUM> and the second button <NUM>.

Preferably, as shown in <FIG>, an embodiment of the first button <NUM> is provided.

The first button <NUM> includes the first button operating portion <NUM>, the first button's transmission portion <NUM> and the second button's track bar <NUM>. Of the first button operating portion <NUM>, one end is the first button operating end, and the other end is connected to one end of the first button's transmission portion <NUM> in overlap, the other end of which is provided with the first button connecting hole <NUM> and the first button's track protrusion <NUM>; the second button's track bar <NUM> is arranged on one side of the first button's transmission portion <NUM>, and the second button's track bar <NUM> and the first button operating portion <NUM> are positioned on the same side of the first button's transmission portion <NUM>; the first button connecting hole <NUM> is connected to one end of the first connecting rod <NUM> of the operating mechanism, and the first button's track ridge <NUM> is slidably arranged in the track groove <NUM> of the circuit breaker housing <NUM>. Further, as shown in <FIG>, the first button <NUM> further includes the rack limiting groove <NUM> arranged on one side of the first button's transmission portion <NUM>, and the rack limiting groove <NUM> and the second button's track bar <NUM> are positioned on the both sides of the first button's transmission portion <NUM> respectively. Further, as shown in <FIG>, the first button's transmission portion <NUM> further includes the switch-on side wall <NUM> and the switch-off side wall <NUM> arranged at the both ends of the rack limiting groove <NUM>; the inner side of switch-on side wall <NUM> is the switch-on side surface <NUM>, the inner side of the switch-off side wall <NUM> is the switch-off side surface <NUM>; the first button's track ridge <NUM> is arranged at one end of the switch-on side wall <NUM>.

Preferably, as shown in <FIG>, an embodiment of the second button <NUM> is provided.

The second button <NUM> includes the second button operating portion <NUM>, the second button's transmission portion <NUM>, the second button's track portion <NUM> and the second button connecting hole <NUM>; of the second button operating portion <NUM>, one end is the second button operating end, and the other end is connected to one end of the second button's transmission portion <NUM>, the other end of which is provided with the second button connecting hole <NUM>; the second button's track portion <NUM> is arranged on the side of the second button's transmission portion <NUM>, and the side of the second button's track portion <NUM> facing the first button's transmission portion <NUM> is provided with the second button's track groove slidingly co-operated with the second button's track bar <NUM>. Specifically, in the directions shown in <FIG>, the second button's track portion <NUM> is arranged on the right side of the second button's transmission portion <NUM>.

Preferably, the first button <NUM> and the second button <NUM> are positioned inside the first button hole and the second button hole during the switch-on and switch-off operation, respectively, and do not protrude from the circuit breaker housing <NUM>, so as to avoid accidental touch.

As shown in <FIG>, the second embodiment of the circuit breaker of the present invention is provided.

This embodiment is different from the first embodiment in that: the button mechanism <NUM> only includes the first button <NUM>, and one end of the first button <NUM> protrudes outside the circuit breaker housing <NUM>, enabling the switch-on operation and switch-off operation by pressing and pulling respectively; the connecting rod structure <NUM> only includes the first connecting rod <NUM>, through which the first button <NUM> is drivingly connected to the transmission member <NUM>.

Specifically, as shown in <FIG>, of the first button <NUM>, the upper end protrudes outside the circuit breaker housing <NUM>, and the lower end is drivingly connected to the transmission member <NUM> through the first connecting rod <NUM>. The electric mechanism 2c is co-operated with the first button <NUM> through the transmission rack 26c, so as to enable the switch-on operation and switch-off operation.

As shown in <FIG> and <FIG>, the third embodiment of the circuit breaker of the present invention is provided.

This embodiment is different from the first embodiment in that: the first button <NUM> and the transmission rack 26c are fixedly connected to each other, or the first button <NUM> and the transmission rack 26c are integrally shaped; the transmission gear set includes the first fan-shaped gear 251c drivingly engaged with the transmission rack 26c; when the circuit breaker switches on, the first fan-shaped gear 251c rotates in the first direction and drives the first button <NUM> to move toward the inside of the circuit breaker housing <NUM> through the transmission rack 26c, thus the circuit breaker switches on and the first fan-shaped gear 251c rotates to its disengagement from the transmission rack 26c; when the circuit breaker switches off, the first fan-shaped gear 251c rotates in the second direction and drives the first button <NUM> to move toward the outside of the circuit breaker housing <NUM> through the transmission rack 26c, thus the circuit breaker switches off and the first fan-shaped gear 251c rotates to its disengagement from the transmission rack 26c. In the circuit breaker of the present invention, the first fan-shaped gear 250c drives the operating mechanism through the transmission rack 26c, so that after ending the switch-on/switch-off operation on the circuit breaker the first fan-shaped gear 251c rotates to its disengagement from the transmission rack 26c, thereby bringing out no interference with the first button <NUM>. Firstly, users can still manually perform the switch-on/switch-off operation on the circuit breaker; secondly, when the circuit breaker trips off due to a short circuit or overload fault, the first fan-shaped gear 251c will not affect the operation of the operating mechanism, ensuring the protection performance of the circuit breaker.

Specifically, as shown in <FIG>, the circuit breaker is in the switch-off state, the first fan-shaped gear 251c is disengaged from the transmission rack 26c, the driving motor 20c drives the first fan-shaped gear 251c to rotate clockwise, then the first fan-shaped gear 251c rotates to its engagement with the transmission rack 26c and continues to rotate, driving the first button <NUM> to move downwards by the transmission rack 26c, as shown in <FIG>, after the circuit breaker switches on, the first fan-shaped gear 251c continues to rotate to its disengagement from the transmission rack 26c; as shown in <FIG>, the circuit breaker is in the switch-on state, the first fan-shaped gear 251c is disengaged from the transmission rack 26c, the driving motor 20c drives the first fan-shaped gear 251c to rotate counterclockwise, then the first fan-shaped gear 251c rotates to its engagement with the transmission rack 26c and continues to rotate, driving the first button <NUM> to move upwards by the transmission rack 26c, as shown in <FIG>, after the circuit breaker switches off, the first fan-shaped gear 251c continues to rotate to its disengagement from the transmission rack 26c.

Preferably, as shown in <FIG>, the transmission gear set of this embodiment is different from that of the first embodiment in that: the driving gear 25c includes the first fan-shaped gear 251c and the fourth transmission gear 250c is coaxial linkage with each other, and the fourth transmission gear 250c meshes with the third transmission gear 24c.

As shown in <FIG> and <FIG>, the fourth embodiment of the circuit breaker of the present invention is provided.

This embodiment is different from the first embodiment in that: the electric mechanism 2c enables the circuit breaker to electrically switch on and switch off by driving the transmission member <NUM> of the operating mechanism for remote control. The electric mechanism 2c includes the driving motor 20c, the transmission gear set, and the transmission member's gear 27c coaxially arranged with the transmission member <NUM>. The transmission gear set includes the switch-on and switch-off driving gear drivingly co-operated with the transmission member's gear 27c, the switch-on and switch-off driving gear drives the transmission member's gear 27c to rotate, and the transmission member's gear 27c drives the transmission member <NUM> to rotate, enabling the circuit breaker to switch on/switch off.

Preferably, the transmission member <NUM> and the transmission member's gear 27c coaxially interact with each other, and the switch-on and switch-off driving gear is the first fan-shaped gear 251c; when the circuit breaker switches on, the first fan-shaped gear 251c rotates in the second direction to its engagement with the transmission member's gear 27c and drives the transmission member's gear 27c to rotate in the first direction, thus the transmission member's gear 27c drives the transmission member <NUM> to rotate in the first direction, the circuit breaker switches on and the first fan-shaped gear 251c rotates to disengagement from the transmission member's gear 27c; 2hen the circuit breaker switches off, the first fan-shaped gear 251c rotates in the first direction to its engagement with the transmission member's gear 27c and drives the transmission member's gear 27c to rotate in the second direction, thus the transmission member's gear 27c drives the transmission member <NUM> to rotate in the second direction, the circuit breaker switches off and the first fan-shaped gear 251c rotates to its disengagement from the transmission member's gear 27c. In the circuit breaker of the present invention, the first fan-shaped gear 251c drives the operating mechanism through the transmission member's gear 27c, so that ending the switch-on and switch-off operation on the circuit breaker, the first fan-shaped gear 251c rotates to its disengagement from the transmission member's gear 27c, thereby bringing out no interference with the transmission member's gear 27c (and the transmission member <NUM> interacting with the transmission member's gear 27c). Firstly, users can still manually perform the switch-on/switch-off operation on the circuit breaker; secondly, when the circuit breaker trips off due to a short circuit or overload fault, the first fan-shaped gear 251c will not affect the operation of the operating mechanism, ensuring the protection performance of the circuit breaker. Further, as shown in <FIG> and <FIG>, the transmission member's gear 27c is a fan-shaped gear.

Specifically, as shown in <FIG>, the circuit breaker is in the switch-off state, the first fan-shaped gear 251c is disengaged from the transmission member's gear 27c; when the circuit breaker switches on, the driving motor 20c drives the first fan-shaped gear 251c to rotate counterclockwise to its engagement with the transmission member's gear 27c, then the first fan-shaped gear 251c is driven to continue to rotate and drives the transmission member's gear 27c to rotate clockwise, and the transmission member's gear 27c drives the transmission member <NUM> to rotate clockwise, as shown in <FIG>, the circuit breaker has switched on and the first fan-shaped gear 251c is driven to continue to rotate to its disengagement from the transmission member's gear 27c; as shown in <FIG>, the circuit breaker is in the switch-on state, the first fan-shaped gear 251c is disengaged from the transmission member's gear 27c, when the circuit breaker switches on, the driving motor 20c drives the first fan-shaped gear 251c to rotate clockwise to its engagement with the transmission member's gear 27c, then the first fan-shaped gear 251c is driven to continue to rotate and drives the transmission member's gear 27c to rotate counterclockwise, and the transmission member's gear 27c drives the transmission member <NUM> to rotate counterclockwise, as shown in <FIG>, the circuit breaker has broken contact, and the first fan-shaped gear 251c is driven to continue to rotate to its disengagement from the transmission member's gear 27c.

Preferably, this embodiment is the same with the third embodiment in the aspect of the transmission gear set, but different in that each gear has different positional relationship and size from each other, and the number of gears is adjustable.

As shown in <FIG>, the fifth embodiment of the circuit breaker of the present invention is provided.

This embodiment is different from the fourth embodiment in that: the transmission member's gear 27c and the transmission member <NUM> are coaxially arranged, and there is an idle stroke therebetween.

When the circuit breaker switches on, the switch-on and switch-off driving gear rotates in the second direction and drives the transmission member's gear 27c to rotate from the second initial position to the first direction to its position-limiting co-operation with the transmission member <NUM>; the transmission member's gear 27c drives the transmission member <NUM> to rotate in the first direction, thus the circuit breaker switches on and the switch-on and switch-off driving gear rotates in the first direction, so as to drive the transmission member's gear 27c to rotate back to the second initial position; when the circuit breaker switches off, the switch-on and switch-off driving gear rotates in the first direction and drives the transmission member's gear 27c to rotate from the second initial position to the second direction to its position-limiting co-operation with the transmission member <NUM>, the transmission member's gear 27c drives the transmission member <NUM> to rotate in the second direction, thus the circuit breaker switches off and the switch-on and switch-off driving gear rotates in the second direction, so as to drive the transmission member's gear 27c to rotate back to the second initial position. Further, the switch-on and switch-off driving gear is the first fan-shaped gear 251c or a full-shaped gear.

Specifically, as shown in <FIG>, the circuit breaker is in the switch-off state, when the circuit breaker switches on, the driving motor 20c drives the switch-on and switch-off driving gear to rotate counterclockwise, thus the switch-on and switch-off driving gear drives the transmission member's gear 27c to rotate clockwise from the second initial position to its position-limiting co-operation with the transmission member <NUM>, and the transmission member's gear 27c continues to rotate and drives the transmission member <NUM> to rotate clockwise, so that the circuit breaker completes switching on as shown in <FIG>, as shown in <FIG>, the switch-on and switch-off driving gear is driven to rotate clockwise and drives the transmission member's gear 27c to rotate counterclockwise back to the second initial position. As shown in <FIG>, the circuit breaker is in the switch-on state, when the circuit breaker switches off, the driving motor 20c drives the switch-on and switch-off driving gear to rotate clockwise, thus the switch-on and switch-off driving gear drives the transmission member's gear 27c to rotate counterclockwise to its position-limiting co-operation with the transmission member <NUM>, and the transmission member's gear 27c continues to rotate and drives the transmission member <NUM> to rotate counterclockwise, so that the circuit breaker completes switching off, as shown in <FIG>, the switch-on and switch-off driving gear is driven to rotate counterclockwise and drives the transmission member's gear 27c to rotate back to the second initial position.

The circuit breaker of the present invention has an idle stroke between the transmission member's gear 27c and the transmission member <NUM> (that is, only after rotating with a certain angle, the transmission member's gear 27c can drive the transmission member <NUM> to synchronously rotate, before the transmission member <NUM> starts to rotate, the transmission member's gear 27c has rotated with the angle as an idle stroke), therefore, after the operating mechanism actuates the circuit breaker to switch on and switch off through the electric mechanism 2c, the transmission member's gear 27c rotates back to the second initial position, thereby bringing out no interference with the transmission member <NUM>; firstly, users can still manually perform the switch-on/switch-off operation on the circuit breaker; secondly, when a short circuit or overload fault occurs, the circuit breaker can successfully trips off, ensuring the protection performance of the circuit breaker.

As shown in <FIG> and <FIG>, the sixth embodiments of the invention cutter is provided.

This embodiment is different from the fourth embodiment in that: the electric mechanism 2c also includes the fourth transmission gear 250c is coaxial linkage with the first fan-shaped gear 251c, the transmission member <NUM> is arranged coaxially with the transmission member's gear 27c, the operating mechanism also includes the trip-off lever 3c drivingly connected to the lock catch <NUM> and pivotally arranged; when the circuit breaker switches on, the first fan-shaped gear 251c rotates from the third initial position toward the second direction to its engagement with the transmission member's gear 27c and drives the transmission member's gear 27c to rotate from the second initial position toward the first direction, thus the transmission member's gear 27c drives the transmission member <NUM> to rotate in the first direction, the circuit breaker switches on and the first fan-shaped gear 251c rotates to its disengagement from the transmission member's gear 27c, then the transmission member's gear 27c automatically rotates to the second initial position and the transmission member <NUM> stays at the position by which the transmission member <NUM> stands on the moment that the circuit breaker switches on (That is, in the first direction, the transmission member's gear 27c coaxially interacts with the transmission member <NUM>; in the second direction, the transmission member's gear 27c can automatically rotate in the second direction and return back to the second initial position when the transmission member <NUM> stays still. ); when the circuit breaker switches off, the first fan-shaped gear 251c and the fourth transmission gear 250c continue to rotate in the second direction, the fourth transmission gear 250c drives the trip-off lever 3c to rotate, the trip-off lever 3c drives the lock catch <NUM> to rotate in the second direction, so as to release the locking co-operation of the lock catch <NUM> with the jump buckle <NUM>, thus the circuit breaker switches off and the first fan-shaped gear 251c continues to rotate to the third initial position that nearly engages with the transmission member's gear 27c but not yet engages with it. Further, the electric mechanism 2c also includes the transmission member's gear resetting spring used to reset the transmission member's gear 27c.

Specifically, as shown in <FIG>, the circuit breaker is in the switch-on state, the transmission member's gear 27c is at the second initial position, the first fan-shaped gear 251c is disengaged from the transmission member's gear 27c, when the circuit breaker switches off, the driving motor 20c drives the fourth transmission gear 250c and the first fan-shaped gear 251c to rotate synchronously counterclockwise, and the fourth transmission gear 250c drives the lock catch <NUM> to rotate counterclockwise through the trip-off lever 3c during its rotation process, to enable the lock catch <NUM> to release its locking co-operation with the jump buckle <NUM>, thus the circuit breaker switches off and the first fan-shaped gear 251c continues to the third initial position (the same as shown in <FIG>); referring to <FIG>, when the circuit breaker is in the switch-off state, the first fan-shaped gear 251c is at the third initial position, the transmission member's gear 27c is at the second initial position, and the first fan-shaped gear 251c does not engage with the transmission member's gear 27c; when the circuit breaker switches on, the driving motor 20c drives the first fan-shaped gear 251c to rotate counterclockwise to its engagement with the transmission member's gear 27c and drives the transmission member's gear 27c to rotate clockwise, thus the transmission member's gear 27c is driven and enables the transmission member <NUM> to rotate clockwise, referring to <FIG>, the circuit breaker switches on and the first fan-shaped gear 251c rotates to its disengagement from the transmission member's gear 27c, afterward as shown in <FIG>, the transmission member's gear 27c can be driven by the transmission member's gear resetting spring to automatically return to the second initial position, and the transmission member <NUM> stays at the switch-on position.

Preferably, as shown in <FIG>, an embodiment of the trip-off lever 3c is provided.

As shown in <FIG>, the trip-off lever 3c is pivotally installed inside the circuit breaker housing <NUM>, and has the two ends co-operated with the fourth transmission gear 250c and the lock catch <NUM> respectively; the backside of the lock catch <NUM> is provided with the lock catch driving protrusion <NUM> correspondingly co-operated with one end of the trip-off lever 3c; the backside of the fourth transmission gear 250c is provided with the fourth transmission gear driving protrusion 2500c correspondingly co-operated with the other end of the trip-off lever 3c; as shown in <FIG>, when the circuit breaker switches off, the driving motor 20c drives the first fan gear 251c and the fourth transmission gear 250c to rotate counterclockwise (clockwise as shown in <FIG>); the fourth transmission gear driving protrusion 2500c drives the trip-off lever 3c to rotate clockwise (counterclockwise as shown in <FIG>); the trip-off lever 3c drives the lock catch <NUM> to rotate counterclockwise (clockwise as shown in <FIG>), so as to be set off to trip off and switch off. Further, as shown in <FIG>, the trip-off lever 3c has a V-shaped structure, and a trip-off lever axle hole in its middle portion. Of course, the trip-off lever 3c may also adopt other similar structures.

Preferably, the transmission gear set of this embodiment has the same structure as that of the fourth embodiment.

As shown in <FIG> and <FIG>, the seventh embodiment of the circuit breaker of the present invention is provided.

The circuit breaker of the present invention further includes the arc extinguishing system <NUM>, the short-circuit protection mechanism <NUM> and the overload protection mechanism <NUM> drivingly cooperated with the operating mechanism respectively, the wire-inlet terminal 1i and the wire-outlet terminal 1o, which are arranged in the circuit breaking housing; the wire-outlet terminal 1o and the button mechanism <NUM> are arranged at one end of the circuit breaker housing <NUM>, and the wire-inlet terminal 1i is arranged at the other end of the circuit breaker housing <NUM>; the arc extinguishing system <NUM> and the short-circuit protection mechanism <NUM> are arranged side by side between the operating mechanism and the wire-inlet terminal 1i, and the electric mechanism 2c and the overload protection mechanism <NUM> are positioned on one side of the operating mechanism and between the arc extinguishing system <NUM> and the wire-outlet terminal 1o. Further, as shown in <FIG>, the button mechanism <NUM> is arranged opposite to the short-circuit protection mechanism <NUM> and positioned on one side of the circuit breaker housing <NUM>; the wire-outlet terminal 1o and the arc extinguishing system <NUM> are arranged opposite to each other and positioned on the other side of the circuit breaker housing <NUM>. Specifically, as shown in <FIG>, the upper, lower, left, and right sides of <FIG> corresponding 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 wire-outlet terminal 1o and the button mechanism <NUM> are arranged side by side on the upper end of the circuit breaker housing <NUM>, and the wire-outlet terminal 1i is arranged at the lower end of the circuit breaker housing <NUM>; the arc extinguishing system <NUM> and the short-circuit protection mechanism <NUM> are arranged side by side between the operating mechanism and the wire-inlet terminal 1i, and the electric mechanism 2c and the overload protection mechanism <NUM> are positioned on the left side of the operating mechanism and between the arc extinguishing system <NUM> and the wire-outlet terminal 1o.

Preferably, as shown in <FIG> and <FIG>, the circuit breaker further includes the control circuit board 1c connected to the electric mechanism 2c.

Preferably, as shown in <FIG>, the control circuit board 1c is arranged between the bottom plate of the circuit breaker housing <NUM> and the electric mechanism 2c, the control circuit board 1c and the electric mechanism 2c are positioned on the same side of the operating mechanism, and the control circuit board 1c is positioned between the wire-outlet terminal 1o and the arc extinguishing system <NUM>. Specifically, as 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 control circuit board 1c and the electric mechanism 2c are positioned on the left side of the button mechanism <NUM> of the operating mechanism, the control circuit board 1c is positioned on the front side of the bottom plate of the circuit breaker housing <NUM>, and the electric mechanism 2c is positioned on the front side of the control circuit board 1c. The control circuit board 1c basically overlaps the electric mechanism 2c, so the space of the circuit board is small.

Preferably, as shown in <FIG>, the circuit breaker further includes the signal terminal connected to the control circuit board 1c, the signal terminal and the wire-inlet terminal 1i are arranged at the same end of the circuit breaker housing <NUM>, and the signal terminal is positioned between the two wire-inlet terminals 1i.

Preferably, as shown in <FIG>, the short-circuit protection mechanism <NUM> is an electromagnetic release.

Preferably, as shown in <FIG>, the overload protection mechanism <NUM> is a manganin resistor in series connection with the L-pole circuit of the circuit breaker, and the manganin resistor is connected to the control circuit board 1c, and transmits signals to the control circuit board 1c. If an overload fault occurs, the electric mechanism 2c drives the circuit breaker to switch off.

Preferably, the overload protection mechanism <NUM> is a current transformer coupled to the L-pole circuit of the circuit breaker and connected to the control circuit board 1c, and the current transformer collects the current signals of the L-pole circuit and transmits them to the control circuit board 1c. When an overload fault occurs, the electric mechanism 2c drives the circuit breaker to switch off.

Preferably, the overload protection mechanism <NUM> is a bimetallic strip drivingly co-operated with the jump buckle <NUM>. When an overload fault occurs, the bimetallic strip bends and drives the jump buckle <NUM> to rotate, so that the lock catch <NUM> and the jump buckle <NUM> release the locking co-operation with each other, and the circuit breaker switches off.

Preferably, as shown in <FIG>, the circuit breaker housing <NUM> includes the wire-inlet terminal hole <NUM> and the signal terminal hole <NUM> arranged at one end thereof, and the wire-outlet terminal hole, the first button hole and the second button hole arranged at the other end of the circuit breaker housing <NUM>. The wire-inlet terminal, the signal terminal and the wire-outlet terminal are arranged in the corresponding openings, respectively; of the first button <NUM>, one end is slidably arranged in the first button hole, and the other end is connected with the first connecting rod <NUM>; and of the second button <NUM>, one end is slidably arranged in the second button hole, and the other end is connected with the second connecting rod <NUM>.

As the control circuit board 1c not only needs to be connected to the electric mechanism 2c and the overload protection mechanism <NUM> (such as a manganin resistance or a current transformer), but also needs to be connected to the wire-inlet terminal 1i to take electricity, and to the signal terminal to transmit signals. If the control circuit board 1c adopts the embodiment shown in <FIG>, when the control circuit board 1c is connected with the wire-inlet terminal 1i and the signal terminal, wiring will run far away and connects with flexible wires, resulting in the more troubles in wiring and welding during assembly. Thus, whether manual assembly or automatic assembly, it is difficult to control the position of the wires.

Claim 1:
A circuit breaker, comprising a circuit breaker housing (<NUM>); and a button mechanism (<NUM>), an operating mechanism connected with said button mechanism (<NUM>), a movable contact (<NUM>) connected with said operating mechanism and a static contact (<NUM>) co-operated with said movable contact (<NUM>) are all arranged in said circuit breaker housing (<NUM>); wherein operating said button mechanism (<NUM>) enables the circuit breaker to switch on /switch off by means of said operating mechanism; the circuit breaker further includes an electric mechanism (2c) arranged inside said circuit breaker housing (<NUM>) for remote controlling the circuit breaker, whereby said electric mechanism (2c) is drivingly co-operated with said button mechanism (<NUM>) or said operating mechanism, said electric mechanism (2c) can actuate the circuit breaker to switch on /switch off by means of said operating mechanism, or said electric mechanism (2c) can actuate the circuit breaker to switch on /switch off by means of said button mechanism (<NUM>);
wherein the circuit breaker further includes a short-circuit protection mechanism (<NUM>) and an overload protection mechanism (<NUM>) respectively drivingly co-operated with said operating mechanism, an arc extinguishing system (<NUM>), a wire-inlet terminal (1i) and a wire-outlet terminal (1o), which are arranged in the circuit breaker housing (<NUM>) respectively; said wire-outlet terminal (1o) and said button mechanism (<NUM>) are arranged at one end of said circuit breaker housing (<NUM>), and said wire-inlet terminal (1i) is arranged at another end of said circuit breaker housing (<NUM>); said operating mechanism is positioned between said button mechanism (<NUM>) and said wire-inlet terminal (1i); said arc extinguishing system (<NUM>) and said short-circuit protection mechanism (<NUM>) are arranged side by side between said operating mechanism and said wire-inlet terminal (1i); said electric mechanism (2c) is positioned between said operating mechanism and said wire-outlet terminal (1o), and said electric mechanism (2c) and said wire-outlet terminal (1o) are positioned on the same side of said button mechanism (<NUM>); said overload protection mechanism (<NUM>) is positioned on one side of said operating mechanism and between said arc extinguishing system (<NUM>) and said wire-outlet terminal (1o).