CN109390190B - breaker - Google Patents

Abstract

The invention discloses a circuit breaker, which comprises a shell, a heat conducting block, a deflector rod, a bimetallic strip and a mechanical tripping device, wherein the heat conducting block is arranged on the shell; the shell is provided with a first side and a second side, and the first side is provided with a composite terminal for connecting a circuit; the heat conducting block is arranged on the first side of the shell and connected to the composite terminal; the deflector rod is rotatably arranged on the second side of the shell; the bimetallic strip is provided with a positioning end and a free end, the positioning end is connected with the heat conducting block, and the free end penetrates through the shell and extends towards the deflector rod; the mechanical tripping device is arranged on the second side of the shell; the heat conduction piece can conduct the heat of compound terminal to the bimetallic strip, and when the electric current of circuit transships, the heat increase made the bimetallic strip crooked, and the bimetallic strip drives the driving lever and rotates, triggers mechanical trip gear action when the driving lever rotates to a trigger angle. The invention utilizes the heated bending of the bimetallic strip to drive the deflector rod to rotate, thereby realizing the tripping of the circuit breaker. Compared with the existing electronic circuit breaker, the electronic circuit breaker has the advantages of simple structure, fewer constituent elements and lower cost, and can meet different requirements.

Description

breaker

technical field

The present invention relates to the technical field of circuit protection elements, 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. The asynchronous motor is frequently started to protect the power supply line and the motor, which has a wide range of applications. Among them, when the above-mentioned equipment is overloaded or short-circuited, the circuit can be automatically cut off. Moreover, it is generally not necessary to change the components after breaking the fault current.

Referring to FIG. 1 and FIG. 2 , a three-dimensional schematic diagram and an exploded schematic diagram of an existing electronic circuit breaker 100 are respectively shown. The electronic circuit breaker 100 generally includes an intelligent release 110 , a control processing unit 120 , and a mechanical trip device. 130 and current transformer 140. Wherein, the electronic circuit breaker 100 is powered on, and the current transformer 140 measures the load current of each phase of the switch and inputs it to the control processing unit 120 . The control processing unit 120 receives the measurement signal from the current transformer 140, and compares the signal with the current value preset by the intelligent release 110, so as to determine whether the circuit is faulty, so as to control the action of the mechanical trip device 130 to realize the circuit breaker on/off of the device. However, the above-mentioned existing electronic circuit breaker adopts an electronic tripping control scheme, which leads to a complex structure, many components, and high manufacturing cost.

SUMMARY OF THE INVENTION

A main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art, and to provide a circuit breaker with a simple structure, fewer components and lower cost.

To achieve the above object, the present invention adopts the following technical solutions:

According to one aspect of the present invention, there is provided a circuit breaker to be installed in a circuit, wherein the circuit breaker includes a casing, a heat conducting block, a lever, a bimetal and a mechanical trip device; the casing has a first one side and a second side, the first side is provided with a composite terminal connected to the circuit; the heat conduction block is provided on the first side of the housing and is connected to the composite terminal; the lever can be It is rotatably arranged on the second side of the casing; the bimetal has a positioning end and a free end, the positioning end is connected to the heat conducting block, and the free end passes through the casing to the dial a rod extension; the mechanical trip device is mounted on the second side of the housing; wherein the thermally conductive block is capable of conducting heat from the composite terminal to the bimetal so that when the electrical current of the circuit is overloaded, the The increase in heat causes the bimetallic sheet to bend, the bimetallic sheet drives the lever to rotate, and when the lever rotates to a trigger angle, the mechanical tripping device is triggered to act.

According to one embodiment of the present invention, a slot is formed on the casing for the bimetallic sheet to pass through.

According to one embodiment of the present invention, the lever includes a rod body and a first contact; the rod body is rotatably provided on the housing; one end of the first contact is fixed to the rod body, and the other end faces toward the rod body. The mechanical tripping device is extended; wherein, when the lever is rotated to the triggering angle, the first contact triggers the action of the mechanical tripping device.

According to one of the embodiments of the present invention, the free end of the bimetallic strip extends to a position below the first contact; wherein, when the circuit is overloaded, the bimetallic strip pushes the first contact so that the The lever is driven to rotate, and when the lever is rotated to the trigger angle, the mechanical tripping device is triggered to act.

According to one embodiment of the present invention, the first contact includes a positioning portion, a bending portion and a contact portion; one end of the positioning portion is connected to the rod body, and the other end extends toward the mechanical trip device; the bending portion The folded part is connected to the other end of the positioning part and is bent and extended downward; one end of the contact part is connected to the folded part, and the other end extends toward the mechanical tripping device; wherein, the lever is rotated to the desired position. When the triggering angle is set, the contact portion triggers the action of the mechanical tripping device.

According to one embodiment of the present invention, the free end of the bimetallic sheet extends to a position below the positioning portion; wherein, when the circuit is overloaded, the bimetallic sheet pushes the positioning portion to drive the dial When the lever is rotated, when the lever is rotated to the triggering angle, the contact portion triggers the action of the mechanical tripping device.

According to one embodiment of the present invention, the lever includes a plurality of first contacts, and ribs are connected between adjacent first contacts.

According to one embodiment of the present invention, the bimetal sheet is a multi-layer structure, and the multi-layer structure includes at least one active layer and at least one passive layer, and the thermal expansion coefficient of the active layer is greater than that of the passive layer. Thermal expansion coefficient.

According to one embodiment of the present invention, the material of the active layer is a manganese-nickel-copper alloy, a nickel-chromium-iron alloy or a nickel-manganese-iron alloy.

According to one embodiment of the present invention, the material of the passive layer is a nickel-iron alloy.

According to one embodiment of the present invention, the circuit breaker further comprises an electromagnetic block and an instantaneous armature; the electromagnetic block is provided on the first side of the housing and is connected to the composite terminal; the instantaneous armature is rotatable The ground is provided on the second side of the housing and corresponds to the electromagnetic block; wherein, the electromagnetic block generates a magnetic field under the action of the current of the circuit, and the magnetic field acts on the instantaneous armature, and the circuit During a short circuit, the increase of the magnetic field causes the momentary armature to rotate, and the momentary armature drives the toggle lever to rotate, and when the toggle lever rotates to the trigger angle, the mechanical tripping device is triggered to act.

According to one embodiment of the present invention, the lever further includes a second contact; one end of the second contact is fixed to the lever body, and the other end extends toward the momentary magnet; wherein the momentary armature is at the When rotating in the magnetic field, the momentary armature pushes the second contact and drives the lever to rotate.

According to one embodiment of the present invention, the momentary armature includes a pivot portion and a push portion; the pivot portion is rotatably disposed on the second side of the housing; the push portion is connected to the A pivot part; wherein, when the momentary armature rotates in the magnetic field, the pivot part drives the pusher to rotate, and the pusher pushes against the second contact to drive the lever turn.

According to one embodiment of the present invention, the circuit breaker further comprises an armature bracket; the armature bracket is mounted on the second side of the housing through a fixing part; wherein the pivotal part of the instantaneous armature is rotatably arranged on the armature bracket.

According to one embodiment of the present invention, the material of the electromagnetic block is copper.

According to one embodiment of the present invention, the material of the momentary armature is soft iron.

As can be seen from the above technical solutions, the advantages and positive effects of the circuit breaker proposed by the present invention are:

The circuit breaker proposed by the invention utilizes the heated bending of the bimetal sheet to drive the lever to rotate, thereby realizing the tripping of the circuit breaker. Compared with the existing electronic circuit breaker, the circuit breaker proposed by the present invention has simpler structure, fewer components and lower manufacturing cost, and can meet different needs of users.

Further, in the circuit breaker proposed by the present invention, the tripping of the circuit breaker is realized by using the action of the instantaneous armature in the magnetic field. Through the above design, the present invention realizes the instantaneous protection of the circuit breaker while realizing the overload protection of the circuit breaker.

Description of drawings

Various objects, features and advantages of the present invention will become more apparent from consideration of the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the invention and are not necessarily drawn to scale. Throughout the drawings, the same reference numbers refer to the same or like parts. in:

Fig. 1 is a three-dimensional schematic diagram of an existing electronic circuit breaker;

FIG. 2 is an exploded schematic view of the electronic circuit breaker shown in FIG. 1;

3 is an exploded schematic view of a circuit breaker according to an exemplary embodiment;

Fig. 4 is a three-dimensional schematic diagram of the circuit breaker shown in Fig. 3;

FIG. 5 is a schematic three-dimensional structural diagram of the circuit breaker shown in FIG. 3 from another angle;

FIG. 6 is a schematic three-dimensional structural diagram of the momentary armature of the circuit breaker shown in FIG. 3 .

Among them, the reference numerals are described as follows:

100. Electronic circuit breaker;

110. Intelligent release;

120. Control processing unit;

130. Mechanical trip device;

140. Current transformer;

200. circuit breaker;

210. shell;

211. Slotting;

220. Thermal block;

230. Bimetallic sheet;

231. free end;

240. lever;

241. rod body;

242. The first contact;

2421. Positioning department;

2422. Bending part;

2423. Contact Department;

243. The second contact;

244. Rib plate;

250. Mechanical tripping device;

260. Instantaneous armature;

261. pivot part;

262. Pushing Department;

270. armature bracket;

271. Fixed part;

280. Electromagnetic Blocks.

Detailed ways

Exemplary embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and accompanying drawings are essentially for illustration purposes, rather than for limiting the present invention. invention.

In the following description of various exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of example various exemplary structures, systems in which aspects of the present invention may be implemented and steps. It is to be understood that other specific arrangements of components, structures, exemplary devices, systems and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms "end," "lower," "between," "side," etc. may be used in this specification to describe various exemplary features and elements of the invention, these terms are used herein for convenience only , for example according to the orientation of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of structures to fall within the scope of the present invention.

Referring to FIG. 3, an exploded schematic view of a circuit breaker 200 capable of embodying the principles of the present invention is representatively shown. In this exemplary embodiment, the circuit breaker 200 proposed by the present invention is described by taking the circuit system of AC800A-1600A as an example. It is easily understood by those skilled in the art that, in order to apply the circuit breaker 200 to other circuit systems or devices, various modifications, additions, substitutions, deletions or other changes may be made to the following specific embodiments. Still within the scope of the principles of the circuit breaker 200 proposed by the present invention.

As shown in FIG. 3 , in this embodiment, the circuit breaker 200 proposed by the present invention mainly includes a housing 210 , an overload trip trigger assembly, a lever 240 and a mechanical trip device 250 . Referring to FIG. 4 to FIG. 6 , FIG. 4 is a representative schematic diagram of the three-dimensional structure of the circuit breaker 200 ; FIG. 5 is a representative schematic diagram of the three-dimensional structure of the circuit breaker 200 from another angle; FIG. 6 The schematic diagram of the three-dimensional structure of the instantaneous armature 260 of the circuit breaker 200 is represented in FIG. The main components of the circuit breaker 200 proposed by the present invention will be described in detail below with reference to the above drawings.

As shown in FIG. 3 to FIG. 5 , in this embodiment, the housing 210 has three composite terminals for connecting circuits. Wherein, the casing 210 can be made of conventional plastic casing material, but is not limited to this. For the convenience of description, the two opposite sides of the housing 210 are defined as the first side and the second side respectively, and the side of the housing 210 where the composite terminal is provided is defined as the first side, and the housing 210 is mounted with a One side of the mechanical trip device 250 is the second side.

As shown in FIG. 4 and FIG. 5 , in this embodiment, the lever 240 is rotatably disposed on the second side of the housing 210 , and the extension direction of the lever 240 and the linear direction jointly defined by the three heat-conducting blocks 220 are in the parallel in space. Specifically, in this embodiment, the lever 240 mainly includes a rod body 241 and three first contacts 242 , and the first contacts 242 roughly correspond to the positions of the mechanical trip device 250 . The rod body 241 is rotatably disposed on the second side of the housing 210 . One end of each first contact 242 is fixed to the rod body 241 , and the other end extends toward the mechanical trip device 250 (ie, the direction away from the second side). Each of the first contacts 242 includes a positioning portion 2421 , a bending portion 2422 and a contact portion 2423 . One end of the positioning portion 2421 is connected to the rod body 241 , and the other end extends toward the mechanical trip device 250 . The bending portion 2422 is connected to the other end of the positioning portion 2421 and extends downward. Extends toward the mechanical trip device 250 .

Further, as shown in FIG. 3 , in this embodiment, a rib 244 connecting the two first contacts 242 and the rod body 241 is provided between the two adjacent first contacts 242 of the lever 240 , In order to strengthen the structural strength of the lever 240 .

As shown in FIGS. 3 and 5 , in this embodiment, the overload trip trigger assembly mainly includes three thermally conductive blocks 220 and three bimetallic sheets 230 .

As shown in FIG. 3 and FIG. 5 , in this embodiment, the three thermally conductive blocks 220 are respectively connected under the three composite terminals and located on the first side of the housing 210 . The thermally conductive block 220 can preferably be made of copper, and can also be selected from other metals or other thermally conductive materials with good thermal conductivity, which is not limited thereto. In this embodiment, the circuit breaker 200 is described with three composite terminals. Those skilled in the art can easily understand that in other embodiments of the present invention, the number of composite terminals may be one or more. Therefore, the overload trip trigger assembly may include one or more thermally conductive blocks 220 , which will not be described in detail here. Through the above structure, the thermally conductive block 220 can conduct the heat generated by the composite terminal to the bimetal 230 .

As shown in FIG. 5 , in this embodiment, three slots 211 are formed on the casing 210 to respectively allow the three bimetallic sheets 230 to pass through. Of course, in other embodiments, the bimetallic sheets 230 can also pass through. Other structures pass through the casing 210, or directly pass through the casing 210, without limitation. The free end 231 of each bimetal 230 extends to a position below the positioning portion 2421 of the corresponding first contact 242 . Based on the above structure, when the circuit is overloaded, the heat transferred from the thermally conductive block 220 to the bimetal 230 increases, and the bimetal 230 is heated to bend and push the positioning portion 2421 of the first contact 242 to drive the lever 240 to rotate. When rotated to a preset trigger angle, the contact portion 2423 of the first contact 242 triggers the action of the mechanical tripping device 250 to achieve tripping, thereby providing the circuit breaker 200 with an overload protection function. In other embodiments, the first contact 242 of the lever 240 can also choose other forms of structure and is not limited to this embodiment. The free end 231 of the bimetal 230 preferably extends to a position below the first contact 242 . When the circuit is overloaded, the bimetal 230 is heated and bent and pushes the first contact 242 to drive the lever 240 to rotate. When the lever 240 rotates to the trigger angle, the mechanical trip device 250 is triggered to act. Furthermore, the lever 240 is not limited to the structure with the first contact 242, the bimetal 230 can cooperate with other structures on the lever 240, so that the bimetal 230 can push the other structures to drive the lever when the bimetal 230 is heated and bent. 240 is rotated to trigger the action of the mechanical trip device 250 when the lever 240 is rotated to the triggering angle, so as to realize the overload protection function of the circuit breaker 200 .

As shown in FIG. 3 , in this embodiment, each bimetal 230 has a positioning end connected to the thermally conductive block 220 and a free end 231 extending toward the first contact 242 through the housing 210 . Wherein, the bimetal 230 is preferably a double-layer structure and includes an active layer and a passive layer. Due to the difference in thermal expansion coefficients between the active layer and the passive layer, when the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the whole bimetal sheet 230 is bent to the passive layer side, and its curvature changes to generate deformation . Among them, the thermal expansion coefficient of the active layer is higher, and the expansion coefficient of the passive layer is lower. Specifically, in this embodiment, the material of the active layer may preferably be a manganese-nickel-copper alloy, a nickel-chromium-iron alloy, a nickel-manganese-iron alloy, etc., and the material of the passive layer may preferably be a nickel-iron alloy, but not limited thereto. In other embodiments, the bimetal 230 is not limited to a double-layer structure, and can adopt a structure of three or more layers. The active layer and the passive layer with different thermal expansion coefficients are used to bend the bimetal 230 directionally when heated, so that the The function of driving the lever 240 to rotate is realized.

Based on the above design, when the circuit in which the circuit breaker 200 of the present invention is located is overloaded, the current of the circuit reaches an overload action value, the heat generated by the composite terminal increases, and the heat is transferred to the bimetal 230 through the heat conducting block 220 , and the bimetal 230 When heated, the first contact 242 drives the lever 240 to rotate. When the lever 240 rotates to the trigger angle, the first contact 242 triggers the mechanical tripping device 250 to act, and the circuit breaker 200 is tripped and disconnected.

It should be noted here that the circuit breaker 200 shown in the drawings and described in this specification is but one example of many types of circuit breakers 200 that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details of circuit breaker 200 or any component of circuit breaker 200 shown in the drawings or described in this specification.

For example, as shown in FIGS. 5 and 6 , in this embodiment, the circuit breaker 200 proposed by the present invention may further include a short-circuit tripping trigger assembly.

As shown in FIGS. 5 and 6 , in this embodiment, the short-circuit tripping trigger assembly mainly includes three electromagnetic blocks 280 and three instantaneous armatures 260 . The three electromagnetic blocks 280 are all disposed on the first side of the housing 210 and are respectively connected to the three composite terminals to generate a magnetic field acting on the instantaneous armature 260 under the action of the current of the circuit. The momentary armature 260 is rotatably provided on the second side of the housing 210 . Specifically, in this embodiment, the material of the momentary armature 260 may preferably be soft iron, and each momentary armature 260 includes a pivoting portion 261 and a pushing portion 262 . The pivoting portion 261 is rotatably disposed on the second side of the housing 210 , and the pushing portion 262 is connected to the pivoting portion 261 . In addition, the lever 240 further includes three second contacts 243 . One end of each second contact 243 is fixed to the rod body 241, and the other end extends toward the momentary magnet. When the circuit is short-circuited, a large current occurs in the circuit, and the magnetic field generated by the large current acts on the instantaneous armature 260 to make it act in the magnetic field. The instantaneous armature 260 pushes the second contact 243 to drive the lever 240 to rotate, and the lever 240 rotates When the trigger angle is reached, the mechanical trip device 250 is triggered to act, the circuit breaker 200 is tripped and disconnected, and the instantaneous (short circuit) protection function of the circuit breaker 200 is realized. Wherein, in this embodiment, the positions of the three first contacts 242 and the three second contacts 243 correspond respectively, and the positions of the bimetal 230 and the momentary armature 260 are the same. In other embodiments, according to the protection requirements of the circuit, the numbers of the bimetals 230 and the instantaneous armatures 260 can also be different, so as to provide at least one of overload protection and instantaneous protection for different circuits. The relative position and arrangement of the piece 230 and the momentary armature 260 can also be adjusted flexibly.

Further, as shown in FIG. 5 and FIG. 6 , in this embodiment, the circuit breaker 200 proposed by the present invention further includes three armature brackets 270 , each armature bracket 270 is installed on the second side of the housing 210 , and the three The two momentary armatures 260 are respectively rotatably mounted on the three armature brackets 270 . Specifically, in this embodiment, each armature bracket 270 has a fixing portion 271 on both sides, which may preferably be a lug plate. The lug plate is provided with a positioning hole and is fixed to the housing 210 by screws. In addition, the pivot portion 261 of the momentary armature 260 is rotatably disposed on the armature bracket 270 , and the pushing portion 262 of the momentary armature 260 is exposed on the armature bracket 270 to push against the second contact 243 to drive the momentary armature 260 when it rotates. The lever 240 is rotated. Furthermore, in this embodiment, a return spring is connected between the armature bracket 270 and the momentary armature 260 to drive the momentary armature 260 to reset when the current decreases and the magnetic field weakens after the momentary armature 260 acts during a short circuit.

Based on the above design, when the circuit is short-circuited, the magnetic field generated by the large current acts on the instantaneous armature 260 to make it act in the magnetic field, and the instantaneous armature 260 drives the lever 240 to rotate, and when the lever 240 rotates to the trigger angle, the mechanical tripping device is triggered 250 acts, the circuit breaker 200 is tripped and disconnected.

It should be noted that the conduction of heat from the heat conduction block 220 to the bimetal sheet 230 is a continuous process. By adjusting the bimetal sheet 230 and the structure, number of layers or materials, etc., the required amount of the bimetal sheet 230 to start bending can be preset. Overload calorific value. That is, when the current of the circuit is overloaded and the heat generated by the composite terminal reaches the above-mentioned overload heat value, the bimetal 230 is bent to realize the function of overload tripping. Correspondingly, the above electromagnetic block 280 converts the current of the circuit into a magnetic field, and acts on the instantaneous armature 260 through the magnetic field, which is a continuous process. In the process of starting to rotate, it is necessary to overcome the elastic force of the return spring or the magnetic inductance of the instantaneous armature 260, and preset the short-circuit magnetic field strength required for the instantaneous armature 260 to start to rotate. That is, when the circuit is short-circuited and the current increases, and the magnetic field strength of the magnetic field generated by the electromagnetic block 280 reaches the above-mentioned short-circuit magnetic field strength, the instantaneous armature 260 starts to rotate to realize the function of short-circuit tripping.

To sum up, the advantages and positive effects of the circuit breaker proposed by the present invention are:

The circuit breaker proposed by the invention utilizes the heated bending of the bimetal sheet to drive the lever to rotate, thereby realizing the tripping of the circuit breaker. Compared with the existing electronic circuit breaker, the circuit breaker proposed by the present invention has simpler structure, fewer components and lower manufacturing cost, and can meet different needs of users.

Further, in the circuit breaker proposed by the present invention, the tripping of the circuit breaker is realized by using the action of the instantaneous armature in the magnetic field. Through the above design, the present invention realizes the instantaneous protection of the circuit breaker while realizing the overload protection of the circuit breaker.

Exemplary embodiments of the circuit breaker proposed by the present invention are described and/or illustrated in detail above. However, embodiments of the present invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be used independently and separately from other components and/or steps described herein. Each component and/or each step of one embodiment may also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the terms "a," "an," "above," and the like are used to mean that there are one or more of the elements/components/etc. The terms "comprising", "including" and "having" are used to indicate an open-ended inclusive meaning and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc. In addition, the terms "first" and "second" and the like in the claims and the description are used only as labels, not as numerical limitations on their objects.

While the circuit breaker proposed by the present invention has been described in terms of various specific embodiments, those skilled in the art will recognize that changes may be made to practice of the present invention within the spirit and scope of the claims.

Claims (12)

1. A circuit breaker for setting in a circuit, wherein the circuit breaker comprises: a housing having a first side and a second side, the first side being provided with a composite terminal connecting the circuit; a heat conducting block, arranged on the first side of the casing, and connected to the composite terminal; a lever, which is rotatably arranged on the second side of the casing; A bimetallic sheet has a positioning end and a free end, the positioning end is connected to the thermally conductive block, and the free end extends through the housing to the lever; and a mechanical trip device mounted on the second side of the housing; Wherein, the heat conducting block can conduct the heat of the composite terminal to the bimetal strip. When the current of the circuit is overloaded, the increase of the heat causes the bimetal strip to bend, and the bimetal strip drives the bimetal strip. The lever is rotated, and when the lever is rotated to a trigger angle, the action of the mechanical tripping device is triggered, The lever includes: a rod body rotatably provided on the housing; and a first contact, one end is fixed on the rod body, and the other end extends toward the mechanical tripping device; Wherein, when the lever is rotated to the triggering angle, the first contact triggers the action of the mechanical tripping device, The free end of the bimetallic sheet extends to a position below the first contact; wherein, when the circuit is overloaded, the bimetallic sheet pushes the first contact to drive the lever to rotate, and the When the lever is rotated to the trigger angle, the action of the mechanical trip device is triggered, The circuit breaker also includes: an electromagnetic block, disposed on the first side of the housing, and connected to the composite terminal; and an instantaneous armature, rotatably disposed on the second side of the housing, and corresponding to the electromagnetic block; The electromagnetic block generates a magnetic field under the action of the current of the circuit, and the magnetic field acts on the instantaneous armature. When the circuit is short-circuited, the magnetic field increases to make the instantaneous armature rotate, and the instantaneous armature drives the instantaneous armature. The lever is rotated, and when the lever is rotated to the trigger angle, the mechanical tripping device is triggered to act, The lever also includes: a second contact, one end is fixed on the rod body, and the other end extends toward the momentary magnet; Wherein, when the momentary armature rotates in the magnetic field, the momentary armature pushes the second contact to drive the lever to rotate. 2 . The circuit breaker according to claim 1 , wherein a slot is formed on the casing for the bimetal sheet to pass through. 3 . 3. The circuit breaker of claim 1, wherein the first contact comprises: a positioning part, one end is connected to the rod body, and the other end extends toward the mechanical tripping device; a bending part, connected to the other end of the positioning part and extending downward; and a contact part, one end is connected to the bending part, and the other end extends toward the mechanical tripping device; Wherein, when the lever is rotated to the triggering angle, the contact portion triggers the action of the mechanical tripping device. 4. The circuit breaker according to claim 3, wherein the free end of the bimetal extends to a position below the positioning portion; wherein when the circuit is overloaded, the bimetal pushes the bimetal The positioning portion drives the lever to rotate, and when the lever rotates to the triggering angle, the contact portion triggers the action of the mechanical tripping device. 5 . The circuit breaker according to claim 1 , wherein the lever comprises a plurality of first contacts, and ribs are connected between adjacent first contacts. 6 . 6 . The circuit breaker according to claim 1 , wherein the bimetal sheet is a multi-layer structure, and the multi-layer structure includes at least one active layer and at least one passive layer, and the thermal expansion of the active layer The coefficient is greater than the thermal expansion coefficient of the passive layer. 7 . The circuit breaker according to claim 6 , wherein the active layer is made of manganese-nickel-copper alloy, nickel-chromium-iron alloy or nickel-manganese-iron alloy. 8 . 8 . The circuit breaker according to claim 6 , wherein the passive layer is made of nickel-iron alloy. 9 . 9. The circuit breaker of claim 1, wherein the momentary armature comprises: a pivot portion rotatably disposed on the second side of the housing; and a pushing portion connected to the pivot portion; Wherein, when the momentary armature rotates in the magnetic field, the pivoting portion drives the pushing portion to rotate, and the pushing portion pushes against the second contact to drive the lever to rotate. 10. The circuit breaker of claim 9, wherein the circuit breaker further comprises: an armature bracket, mounted on the second side of the housing through the fixing part; Wherein, the pivot part of the instantaneous armature is rotatably arranged on the armature bracket. 11. The circuit breaker according to claim 1, wherein the material of the electromagnetic block is copper. 12 . The circuit breaker according to claim 1 , wherein the material of the momentary armature is soft iron. 13 .

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