WO2022126821A1

WO2022126821A1 - Circuit breaker

Info

Publication number: WO2022126821A1
Application number: PCT/CN2021/072851
Authority: WO
Inventors: 魏首勋
Original assignee: 深圳曼顿科技有限公司
Priority date: 2020-12-14
Filing date: 2021-01-20
Publication date: 2022-06-23
Also published as: CN112542361A

Abstract

A circuit breaker (10). The circuit breaker (10) comprises a housing (100) and a first wiring terminal (200), a second wiring terminal (300), a switch assembly (400), and a delay tripping mechanism (500) which are provided in the housing (100). The first wiring terminal (200), the switch assembly (400), and the second wiring terminal (300) are electrically connected in sequence to form a main circuit, and the switch assembly (400) is used for controlling the power on/off of the main circuit. The switch assembly (400) comprises a moving contact (410) and a static contact (430), and a wiring portion (411) is provided on the moving contact (410) in a protruding manner. The wiring portion (411) is electrically connected to the delay tripping mechanism (500) by means of a first wire; the wiring portion (411) is further electrically connected to the second wiring terminal (300) by means of a second wire, and the static contact (430) is electrically connected to the first wiring terminal (200). The circuit breaker (10) can improve the heat dissipation performance of the circuit breaker (10), thereby improving the reliability of the circuit breaker (10).

Description

breaker

This application claims the priority of the Chinese patent application with the application number 202011471564.5 and the invention name "circuit breaker" filed with the China Patent Office on December 14, 2020, the entire contents of which are incorporated into the application by reference.

technical field

The present application relates to the technical field of electrical appliances, and in particular, to a circuit breaker.

Background technique

A circuit breaker refers to a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The high and low voltage boundaries are relatively vague. Generally, those above 3kV are called high-voltage electrical appliances. The circuit breaker can be used to distribute electric energy, start the asynchronous motor infrequently, and affect the power supply line. It can automatically cut off the circuit when serious overload or short circuit and undervoltage faults occur. Its function is equivalent to the combination of fuse switch and overheating relay, etc., and it is generally not required after breaking the fault current. Change parts. The existing circuit breakers are developing towards multi-functionality and miniaturization. Due to the compact layout of the circuit breaker, there is a problem of poor heat dissipation. Poor heat dissipation will cause the circuit breaker to increase in temperature during operation and be easily damaged. and safety incidents.

technical problem

The main purpose of the present application is to provide a circuit breaker, which aims to improve the heat dissipation performance of the circuit breaker, thereby improving the reliability of the circuit breaker.

technical solutions

In order to achieve the above purpose, the present application proposes a circuit breaker, the circuit breaker includes a casing, a first terminal, a second terminal, a switch assembly and a time-delay release mechanism arranged in the casing, the first connection The terminal, the switch assembly and the second terminal are electrically connected in sequence to form a main circuit, the switch assembly is used to control the power on/off of the main circuit; the switch assembly includes a moving contact and a static contact, the moving A wiring part is protruded on the contact; the wiring part is electrically connected with the delay release mechanism through a first wire; the wiring part is also electrically connected with the second terminal through a second wire, so The static contact is electrically connected to the first terminal.

In an embodiment, the movable contact is arranged opposite to the stationary contact, the movable contact is movably switchable in the opening position and the closing position and is arranged in the housing, and the movable contact faces the One side of the static contact is provided with a first contact portion, and the static contact is provided with a second contact portion at a position corresponding to the first contact portion. When the movable contact is in the closing position, the first contact portion is set. A contact portion is in surface contact with the second contact portion.

In one embodiment, a side of the movable contact facing the stationary contact is provided with a bump, the first contact portion is arranged on the bump, and the movable contact corresponds to the bump of the bump. An accommodating groove is provided at the position, and the protruding block is fixedly installed in the accommodating groove.

Optionally, the bump is fixed in the accommodating groove by welding, the bump and the movable contact are welded to form a solder filling layer, and the movable contact faces the side of the bump or A groove is provided on the side of the bump facing the movable contact, and the groove is used for accommodating the solder filling layer.

In one embodiment, a plurality of protrusions are provided on the side of the bump facing the movable contact, and the plurality of protrusions are arranged at intervals along the length direction of the bump, adjacent to the bumps. The grooves are formed therebetween.

Optionally, the time-delay release mechanism includes a first metal piece and a second metal piece, the wiring part is connected to the first metal piece through the first wire, and one end of the second metal piece is connected to the first metal piece. The first metal piece is connected, and the other end of the second metal piece is connected with the second terminal.

In one embodiment, the second metal member includes a plurality of metal plates connected in sequence, and the plurality of metal plates are arranged in a zigzag manner.

In one embodiment, the bump is made of silver alloy material; and/or the thickness of the bump is greater than the thickness of the movable contact.

In one embodiment, the housing is further provided with heat dissipation holes.

In one embodiment, the circuit breaker further includes an instantaneous trip mechanism and an arc extinguishing mechanism, one end of the instantaneous trip mechanism is electrically connected to the first terminal, and the other end of the instantaneous trip mechanism is electrically connected to the first terminal. The static contact is electrically connected, one end of the arc extinguishing mechanism is electrically connected to the static contact, and the other end of the arc extinguishing mechanism is electrically connected to the time delay tripping mechanism.

beneficial effect

In the technical solution of the present application, by arranging the first terminal, the second terminal, the switch assembly and the time-delay release mechanism in the casing, the first terminal, the switch assembly and the second terminal are electrically connected in sequence to form the main The circuit, the switch assembly is used to control the power on/off of the main circuit. The switch assembly includes a moving contact and a static contact. The moving contact is protruded with a wiring part, and the wiring part is electrically connected to the delay release mechanism through the first wire. connection, the wiring part is also electrically connected to the second terminal through the second wire, the static contact is electrically connected to the first terminal, and the raised wiring part increases the volume of the moving contact, making the heat dissipation of the moving contact The area is increased, so that the heat dissipation of the moving contact is fast; at the same time, both the first wire and the second wire are connected to the wiring part on the moving contact. Compared with only one wire connected to the moving contact, the first wire is The contact area with the moving contact is increased with the second lead, so that the contact resistance between the first lead, the second lead and the moving contact is small, the temperature rise of the circuit breaker during operation is low, and the use of the circuit breaker Safer and more reliable. It can be seen that the circuit breaker of the present application can improve the heat dissipation performance of the circuit breaker, thereby improving the reliability of the circuit breaker.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an embodiment of the circuit breaker of the present application;

Fig. 2 is the partial structure schematic diagram in Fig. 1;

Fig. 3 is the partial structure schematic diagram in Fig. 2;

Fig. 4 is the enlarged view of A place in Fig. 3;

5 is a schematic structural diagram of the structure in FIG. 3 from another perspective;

FIG. 6 is an enlarged view of B in FIG. 5 .

Description of reference numbers:

标号 label	名称 name	标号 label	名称 name
10 10	断路器 breaker	430 430	静触头 static contact
100 100	壳体 case	431 431	第二接触部 second contact
200 200	第一接线端 first terminal	440 440	驱动件 driver
300 300	第二接线端 second terminal	441 441	拉杆 tie rod
400 400	开关组件 switch assembly	500 500	延时脱扣机构 Delay release mechanism
410 410	动触头 moving contact	510 510	第一金属件 first metal piece
411 411	接线部 Wiring Department	520 520	第二金属件 second metal piece
420 420	凸块 bump	600 600	瞬时脱扣机构 Instantaneous release mechanism
421 421	第一接触部 first contact	700 700	灭弧机构 Arc extinguishing mechanism
422 422	凸起 bulge

The realization, functional characteristics and advantages of the purpose of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Embodiments of the present invention

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, descriptions involving "first", "second", etc. in this application are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the meaning of "and/or" in the whole text is to include three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, scheme B, or scheme that A and B satisfy at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection claimed in this application.

The present application provides a circuit breaker.

Referring to FIGS. 1 to 4 , in an embodiment of the circuit breaker 10 of the present application, the circuit breaker 10 includes a casing 100 and a first terminal 200 , a second terminal 300 , and a switch assembly 400 disposed in the casing 100 and the delay release mechanism 500, the first terminal 200, the switch assembly 400 and the second terminal 300 are electrically connected in sequence to form the main circuit, the switch assembly 400 is used to control the power on/off of the main circuit; the switch assembly 400 includes a moving The contact 410 and the static contact 430, the movable contact 410 is protruded with a wiring part 411; The terminal 300 is electrically connected, and the static contact 430 is electrically connected to the first terminal 200 .

Specifically, the first terminal 200 can be used as the input terminal of the circuit breaker 10, and can also be used as the output terminal of the circuit breaker 10. In this embodiment, the first terminal 200 is used as the input terminal of the circuit breaker 10 as an example for description and introduction. Then the second terminal 300 is used as an output terminal, and the switch assembly 400 is arranged between the input terminal and the output terminal. The first terminal 200, the switch assembly 400 and the second terminal 300 are electrically connected in sequence to form a main circuit. The switch assembly 400 has an open state and a closed state, and the switch assembly 400 is controlled by switching between the open state and the closed state. Power on/off of the main circuit. The switch assembly 400 includes a moving contact 410 and a static contact 430 . When the switch assembly 400 is in a closed state, the moving contact 410 is in contact with the static contact 430 , and the current connected to the first terminal 200 passes through the static contact of the switch assembly 400 . The head 430 and the moving contact 410 are outputted to the second terminal 300; when the switch assembly 400 is in the open state, the moving contact 410 is separated from the static contact 430, thereby making the first terminal 200 and the second terminal 300 disconnected open. The time-delay trip mechanism 500 is used to provide overcurrent protection for the circuit breaker 10 , and the time-delay trip mechanism 500 will be described in detail later.

Further, the connecting portion 411 may be protruded toward the first terminal 200 or may be protruded toward the second terminal 300 , and the direction of the protruding is not limited herein. The protruding wiring portion 411 is used to connect with the wires. The first wire and the second wire can be arranged on the same side of the wiring portion 411 or on opposite sides of the wiring portion 411. The wiring portion 411 can be provided with wiring slots. Or binding posts to facilitate the connection and fixation of wires. There are various ways of connecting and fixing the first wire and the second wire, such as but not limited to: the first wire and the second wire can be fixed on the wiring part 411 by welding, or can be locked and fixed on the wiring part 411 by a bolt structure superior. Compared with the movable contact 410, the protruding wiring portion 411 increases the volume of the movable contact 410, and both the first wire and the second wire are connected to the wiring portion 411, which increases the contact area between the three. In this way, the contact resistance between the three is small, the heat generated by the circuit breaker 10 during operation is small, the temperature rise is low, and the use of the circuit breaker 10 is safe and reliable.

In the technical solution of the present application, by arranging the first terminal 200 , the second terminal 300 , the switch assembly 400 and the delay release mechanism 500 in the housing 100 , the first terminal 200 , the switch assembly 400 and the second connection The terminals 300 are electrically connected in sequence to form a main circuit. The switch assembly 400 is used to control the power on/off of the main circuit. The switch assembly 400 includes a movable contact 410 and a static contact 430. The movable contact 410 is protruded with a wiring portion 411. The wiring portion 411 is electrically connected to the time-delay trip mechanism 500 through a first wire, the wiring portion 411 is also electrically connected to the second terminal 300 through a second wire, and the static contact 430 is electrically connected to the first terminal 200. The protruding wiring portion 411 increases the volume of the movable contact 410, so that the heat dissipation area of the movable contact 410 increases, so that the heat dissipation of the movable contact 410 is fast; The wiring part 411 on the head 410 is connected. Compared with only one wire connected to the movable contact 410, the first wire and the second wire increase the contact area with the movable contact 410, so that the first wire, the second wire The contact resistance between the conductive connection and the movable contact 410 is small, the temperature rise of the circuit breaker 10 during operation is low, and the use of the circuit breaker 10 is safer and more reliable. It can be seen that the circuit breaker 10 of the present application can improve the heat dissipation performance of the circuit breaker 10 , thereby improving the reliability of the circuit breaker 10 .

Please refer to FIG. 2 to FIG. 4 , in one embodiment, the movable contact 410 and the stationary contact 430 are disposed opposite to each other, and the movable contact 410 is movably arranged in the housing 100 in the opening position and the closing position. The side of the head 410 facing the stationary contact 430 is provided with a first contact portion 421, and the stationary contact 430 is provided with a second contact portion 431 at a position corresponding to the first contact portion 421. When the movable contact 410 is in the closing position, the first contact portion 431 is provided. The first contact portion 421 abuts and is in surface contact with the second contact portion 431 .

Specifically, the switch assembly is rotated to drive the movable contact 410 to switch between the opening position and the closing position. The first contact portion 421 of the movable contact 410 has a first contact surface, and the second contact of the stationary contact 430 The portion 431 has a second contact surface, the first contact surface and the second contact surface may both be plane, or one may be a plane, the other may be a curved surface, or an arc surface, which is not limited herein. When the movable contact 410 is in the closing position, the first contact surface abuts against the second contact surface, so that the contact between the movable contact 410 and the stationary contact 430 is good, which is compared with the existing movable contact 410 and the stationary contact 430. In terms of the edge-to-surface contact between the contacts 430, the surface contact between the movable contact 410 and the static contact 430 makes the contact area large and the contact resistance small, so that the temperature rise of the circuit breaker 10 is low during operation. , the heat dissipation is fast, the circuit breaker 10 is safe and reliable in use, and the reliability of the circuit breaker 10 is improved.

Further, the side of the movable contact 410 facing the stationary contact 430 is provided with a bump 420 , the first contact portion 421 is arranged on the bump 420 , and the position of the movable contact 410 corresponding to the bump 420 is provided with an accommodating groove, the convex The block 420 is fixedly installed in the accommodating groove. It can be understood that the first contact portion 421 is provided on the bump 420, and the bump 420 is used for abutting with the second contact portion 431 of the static contact 430. The provision of the bump 420 increases the volume of the movable contact 410. This is beneficial to the heat dissipation of the movable contact 410 , and by fixing the bump 420 in the accommodating groove, it is convenient to position the bump 420 . There are many ways to fix the bump 420, for example but not limited to: the bump 420 is fixed in the accommodating groove by welding, or fixed in the accommodating groove by screw connection, or fixed in the accommodating groove by snap connection. slot. Fixing the bump 420 in the accommodating groove can ensure the stability of the contact between the movable contact 410 and the stationary contact 430 , thereby improving the reliability of the circuit breaker 10 .

Further, the bumps 420 are made of silver alloy material. The movable contact 410 and the static contact 430 can be made of conductive materials. In this embodiment, copper materials are used, and the bumps 420 are made of silver alloy materials. The silver alloy materials have low resistivity, good electrical conductivity, and low cost. In this way, the electrical conductivity of the movable contact 410 can be improved and the heat generated when the movable contact 410 is in contact with the static contact 430 can be reduced. In addition, the thickness of the bump 420 is greater than that of the movable contact 410 . This arrangement increases the volume of the movable contact 410 , so that the contact area between the movable contact 410 and the stationary contact 430 is larger, the contact resistance between the two is small, and the heat dissipation area is large, thereby improving the heat dissipation performance of the circuit breaker 10 .

Referring to FIGS. 5 and 6 , in one embodiment, the bump 420 is fixed in the accommodating groove by welding, the bump 420 and the movable contact 410 are welded to form a solder fill layer, and the movable contact 410 faces the bump 420 . One side or the side of the bump 420 facing the movable contact 410 is provided with a groove, and the groove is used for accommodating the filling solder layer. It can be understood that when the bump 420 is arranged in the accommodating groove of the movable contact 410, there is a gap between the two, and the bump 420 and the movable contact 410 are connected and fixed by welding, so that the connection between the two is more firm. , and the side of the moving contact 410 facing the bump 420 or the side of the bump 420 facing the moving contact 410 is provided with a groove, and the filling solder layer formed by welding fills the groove, so that the bump 420 and the moving contact 410 There is no gap between the two, and the connection between the two is tighter. Compared with the filler solder layer provided on the side of the bump 420 and the movable contact 410, the filler solder layer is provided between the bump 420 and the movable contact 410. On the opposite side, the contact area between the bump 420 and the movable contact 410 is large, the contact resistance of the two is small, the heat generation is small, the temperature rise of the movable contact 410 during the operation of the circuit breaker 10 is low, and the use of the circuit breaker 10 Safer and more reliable.

Further, the side of the bump 420 facing the movable contact 410 is provided with a plurality of protrusions 422 , the plurality of protrusions 422 are arranged at intervals along the length direction of the bump 420 , and the recesses are formed between adjacent protrusions 422 . groove. It can be understood that the bump 420 and the movable contact 410 are both made of conductive materials. Compared with the part processing in the accommodating groove of the movable contact 410 and the part processing on the bump 420, the bump 420 The volume is smaller, which is more convenient for processing, and the grooves formed by the adjacent protrusions 422 make the processing process of the parts of the protrusions 420 simpler, thereby improving the manufacturability of the circuit breaker 10 .

Further, the housing 100 is also provided with heat dissipation holes. The heat generated by the circuit breaker 10 during operation can be discharged from the heat dissipation holes on the casing 100 to improve the heat dissipation effect of the circuit breaker 10 and avoid damage and safety caused by the high temperature inside the casing 100 of the circuit breaker 10 Accident conditions occur, which in turn improves the reliability of the circuit breaker 10 .

Referring to FIGS. 3 to 6 , in one embodiment, the time-delay release mechanism 500 includes a first metal member 510 and a second metal member 520 , the wiring portion 411 is connected to the first metal member 510 through a first wire, and the second metal member 510 One end of the metal piece 520 is connected to the first metal piece 510 , and the other end of the second metal piece 520 is connected to the second terminal 300 .

Specifically, the time-delay trip mechanism 500 is used to provide overcurrent protection for the circuit breaker 10. Two ends of the second metal piece 520 can be respectively connected to the first metal piece 510 and the second terminal 300 by welding. The metal part 510 is arranged in a sheet shape, and will be bent and deformed due to heat generation under the action of the current. The first metal part 510 is connected to the wiring part 411 of the movable contact 410 of the switch assembly 400 through the first wire. The switch assembly 400 includes the driving part 440 , the driving member 440 drives the switch assembly 400 to close and open through the pull rod 441 . When the circuit breaker 10 is working normally, the switch assembly 400 is in the closing position, and the current output by the switch assembly 400 is transmitted to the second terminal 300 through the first metal piece 510 and the second metal piece 520 of the time-delay release mechanism 500 . When the current passing through the first metal piece 510 exceeds the preset value, the first metal piece 510 will be bent and deformed due to heat, and the pull rod 441 with the driving piece 440 will move, so that the switch assembly 400 is in the opening position, thereby realizing the circuit breaker 10 of overcurrent protection. During this process, the second metal piece 520 plays a conductive role. Compared with the first metal piece 510 being directly connected to the second terminal 300, the second metal piece 520 increases the heat dissipation area of the time-delay trip mechanism 500. The current can be dissipated through the first metal part 510 and the second metal part 520 , the heat dissipation area is large, and the heat dissipation of the delay trip mechanism 500 is fast, thereby improving the heat dissipation performance of the circuit breaker.

Further, the second metal member 520 includes a plurality of metal plates connected in sequence, and the plurality of metal plates are arranged in a zigzag manner. It can be understood that the multiple metal plates increase the volume of the second metal piece 520 , so that the heat dissipation area of the second metal piece 520 is large, and the heat dissipates quickly when the current passes through the second metal piece 520 , thereby improving the delay release mechanism 500 . heat dissipation performance.

Referring to FIG. 2 , in one embodiment, the circuit breaker 10 further includes an instantaneous trip mechanism 600 and an arc extinguishing mechanism 700 . One end of the instantaneous trip mechanism 600 is electrically connected to the first terminal 200 . The other end is electrically connected to the static contact 430 , one end of the arc extinguishing mechanism 700 is electrically connected to the static contact 430 , and the other end of the arc extinguishing mechanism 700 is electrically connected to the time delay tripping mechanism 500 .

Specifically, the first terminal 200 is used to connect with an external wire, and the current output by the external wire is output to the instantaneous trip mechanism 600 through the first terminal 200. The instantaneous trip mechanism 600 includes a short-circuit coil and a drive assembly. When the current output to the short-circuit coil is greater than the threshold value of the protection current, the short-circuit coil will generate enough electromagnetic force to drive the driving assembly to control the switch assembly 400 to open, thereby realizing the short-circuit protection function of the circuit breaker 10 .

Further, the arc-extinguishing mechanism 700 includes a plurality of metal arc-extinguishing grids arranged in parallel at intervals and two insulating plates arranged in parallel and at intervals, and the plurality of metal arc-extinguishing grids are arranged between the two insulating plates. When the movable contact 410 and the static contact 430 are separated, the generated arc will enter the metal arc-quenching grid through the static contact 430, and the arc will pass through the multi-layer partition of multiple metal arc-quenching grids, so that the energy is attenuated and the arc is extinguished. purpose of the arc.

The above descriptions are only optional embodiments of the present application, and are not intended to limit the patent scope of the present application. Under the inventive concept of the present application, any equivalent structural transformations made by using the contents of the description and drawings of the present application, or direct/indirect Applications in other related technical fields are included in the scope of patent protection of this application.

Claims

A circuit breaker, wherein the circuit breaker comprises:

case;

The first terminal, the second terminal and the switch assembly are all arranged in the casing. The first terminal, the switch assembly and the second terminal are electrically connected in sequence to form a main circuit, and the switch The assembly is used to control the power on/off of the main circuit; the switch assembly includes a movable contact and a static contact, and a wiring portion is protruded on the movable contact; and

A time-delay release mechanism is arranged in the casing, and the wiring part is electrically connected to the time-delay release mechanism through a first wire; the connection part is also electrically connected to the second terminal through a second wire The static contact is electrically connected with the first terminal.
The circuit breaker according to claim 1, wherein the movable contact is arranged opposite to the stationary contact, and the movable contact is movably switchable in the opening position and the closing position and is arranged in the housing, so The side of the movable contact facing the stationary contact is provided with a first contact portion, and the stationary contact is provided with a second contact portion at a position corresponding to the first contact portion. In the position, the first contact portion abuts and is in surface contact with the second contact portion.
The circuit breaker according to claim 2, wherein a side of the movable contact facing the stationary contact is provided with a bump, the first contact portion is provided on the bump, and the movable contact An accommodating groove is provided at a position corresponding to the protruding block, and the protruding block is fixedly installed in the accommodating groove.
The circuit breaker according to claim 3, wherein the bump is fixed in the accommodating groove by welding, and the bump and the movable contact are welded to form a filler welding layer, and the movable contact faces One side of the bump or the side of the bump facing the movable contact is provided with a groove, and the groove is used for accommodating the solder filling layer.
The circuit breaker according to claim 4, wherein a side of the bump facing the movable contact is provided with a plurality of protrusions, and a plurality of the protrusions are arranged at intervals along the length direction of the bump , the grooves are formed between the adjacent protrusions.
The circuit breaker according to claim 1, wherein the time-delay release mechanism comprises a first metal part and a second metal part, and the wiring part is connected with the first metal part through the first wire, so One end of the second metal piece is connected to the first metal piece, and the other end of the second metal piece is connected to the second terminal.
The circuit breaker according to claim 6, wherein the second metal member comprises a plurality of metal plates connected in sequence, and the plurality of metal plates are arranged in a zigzag manner.
The circuit breaker of claim 3, wherein the bumps are made of a silver alloy material.
The circuit breaker according to claim 3, wherein the thickness of the bump is larger than the thickness of the movable contact.
The circuit breaker according to claim 1, wherein the housing is further provided with heat dissipation holes.
The circuit breaker according to claim 1, wherein the first wire is fixed on the wiring portion by welding, and the second wire is also fixed on the wiring portion by welding.
The circuit breaker according to claim 1, wherein the circuit breaker further comprises an instantaneous trip mechanism and an arc extinguishing mechanism, one end of the instantaneous trip mechanism is electrically connected to the first terminal, and the instantaneous trip mechanism is electrically connected to the first terminal. The other end of the buckle mechanism is electrically connected to the static contact, one end of the arc extinguishing mechanism is electrically connected to the static contact, and the other end of the arc extinguishing mechanism is electrically connected to the time delay tripping mechanism connect.
The circuit breaker according to claim 12, wherein the arc-extinguishing mechanism comprises a plurality of metal arc-quenching grids arranged in parallel at intervals and two insulating plates arranged in parallel and at intervals, and the plurality of metal arc-quenching grids are arranged on the between the two insulating plates.