A circuit breaker

Abstract

This utility model discloses a circuit breaker, belonging to the field of low-voltage electrical technology. The circuit breaker includes a contact structure and a leakage current test circuit. The contact structure includes a first moving contact and a conductive rod electrically connected to the first moving contact. The leakage current test circuit includes a test resistor and a spring contact. The test resistor has a first lead, and the first lead and the end of the conductive rod facing the spring contact are both abutted against and electrically connected to the first surface of the spring contact. The circuit breaker provided by this utility model adopts a lap-connection power extraction method to electrically connect the test resistor and the first moving contact, so as to realize the leakage current test circuit extracting power from the first end of the test resistor, effectively reducing the use of wires, that is, reducing the number of wire connection points and soldering points, reducing the risk of short circuit and leakage current test circuit failure, facilitating assembly, and effectively reducing manufacturing costs.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a circuit breaker. Background Technology

[0002] Residual current operated circuit breakers with overcurrent protection serve as protective electrical devices at the end of a circuit. Besides overload and short-circuit protection, they also provide leakage current protection, effectively protecting electrical lines and reducing the risk of electric shock injuries and fatalities. The circuit breaker includes a built-in leakage current test circuit to check for leakage current failure. Users can determine if the product's leakage current protection function is functioning correctly by pressing the test button in the leakage current test circuit.

[0003] In related technologies, leakage current test circuits typically use a large number of wires to obtain voltage signals from the main circuit. However, wire connections are prone to problems such as loose connections or short circuits due to damaged insulation, which can lead to the failure of the leakage current test circuit. Utility Model Content

[0004] The purpose of this invention is to provide a circuit breaker that effectively reduces the use of wires and lowers the risk of short circuit and leakage test circuit failure.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A circuit breaker is provided, comprising:

[0007] The contact structure includes a first moving contact and a conductive rod electrically connected to the first moving contact;

[0008] The leakage current test circuit includes a test resistor and a spring contact. The test resistor has a first pin, and the first pin and the end of the conductive rod facing the spring contact are both abutted against and electrically connected to the first surface of the spring contact.

[0009] Optionally, the circuit breaker further includes a first terminal block, the test resistor further has a second lead, and the leakage current test circuit further includes:

[0010] The breakpoint connector is electrically connected to the first terminal block.

[0011] The power-connecting piece is electrically connected to the second pin;

[0012] A test button is abutted against the power supply connector, and the test button is used to push the power supply connector until it makes contact with the breakpoint connector to conduct electricity.

[0013] Optionally, the leakage current test circuit further includes a circuit board;

[0014] Wherein, both the first pin and the second pin are soldered to the circuit board; and / or, one end of the power-taking connector is soldered to the circuit board and electrically connected to the second pin through the circuit board.

[0015] Optionally, the circuit breaker further includes a first trip unit, which includes a trip coil; the leakage current test circuit further includes a first wire, a first end of which is electrically connected to the first terminal, and a second end of the first wire, a conductive pin of the first end of the trip coil, and the break connection piece are soldered together.

[0016] Optionally, the leakage current test circuit further includes a circuit board;

[0017] The circuit board is provided with a first soldering groove, and the second end of the first wire, the conductive pin of the first end of the trip coil, and one end of the breakpoint connecting piece are all inserted into the first soldering groove and soldered together with the circuit board; and / or, the circuit board is provided with a second soldering groove, and one end of the power taking connecting piece is inserted into the second soldering groove and soldered together with the circuit board.

[0018] Optionally, the circuit breaker includes an L-pole circuit breaker module and an N-pole circuit breaker module, one of which includes the contact structure and the other includes the first terminal block.

[0019] Optionally, the circuit breaker further includes a housing, the contact structure and the leakage current test circuit are both disposed inside the housing, the housing is provided with a positioning post, the spring is provided with a through hole, the positioning post is inserted into the through hole, and at least a portion of the second surface of the spring abuts against the housing.

[0020] Optionally, the spring has a first conductive portion and a second conductive portion arranged at an angle, the first conductive portion abutting against the first pin, and the second conductive portion abutting against one end of the conductive rod facing the spring.

[0021] Optionally, the circuit breaker further includes a first stationary contact disposed opposite to the first moving contact. The contact structure also includes a positioning spring, a first end of which is connected to the conductive rod, and a second end of which is connected to the first moving contact. When the circuit breaker is closed, the positioning spring provides a force to the first moving contact to compress the first stationary contact. When the circuit breaker is open, the positioning spring provides a force to the first moving contact to keep it separated from the first stationary contact.

[0022] Optionally, the circuit breaker further includes:

[0023] A partition is provided with a first positioning hole and a positioning groove, and the end of the conductive rod facing away from the spring piece is inserted into the first positioning hole;

[0024] A limiting plate is disposed within the positioning groove, and the first moving contact and the positioning spring are sandwiched between the partition and the limiting plate.

[0025] Beneficial effects: The circuit breaker provided by this utility model has the first pin of the test resistor and the end of the conductive rod facing the spring contact both abutting against and electrically connected to the first surface of the spring contact. The test resistor and the first moving contact are electrically connected by a lap-connection power-taking method, so as to realize the leakage current test circuit draws power from one end of the test resistor. This effectively reduces the use of wires, that is, reduces the number of wire connection points and soldering points, reduces the risk of short circuit and leakage current test circuit failure, facilitates assembly, and effectively reduces manufacturing costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the circuit breaker provided by this utility model at the circuit board.

[0027] Figure 2 This is a schematic diagram of the internal structure of the partition plate facing the first cover plate provided by this utility model. Figure 1 ;

[0028] Figure 3 This is a schematic diagram of the internal structure of the partition plate facing the second cover plate provided by this utility model;

[0029] Figure 4 This is a partial structural schematic diagram of the circuit breaker provided by this utility model;

[0030] Figure 5 This is a schematic diagram of the internal structure of the partition plate facing the first cover plate provided by this utility model. Figure 2 ;

[0031] Figure 6 This is an exploded view of the circuit breaker provided by this utility model;

[0032] Figure 7 This is a schematic diagram of the connection between the first cover plate and the spring sheet provided by this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the spring sheet provided by this utility model.

[0034] In the picture:

[0035] 110. First moving contact; 111. Connecting hole; 120. Conductive rod; 130. Positioning spring; 140. Positioning rod;

[0036] 210. Test resistor; 211. First pin; 212. Second pin; 220. Spring contact; 221. First conductive part; 222. Second conductive part; 223. Through hole; 230. Breakpoint connecting piece; 231. First connecting part; 232. Second connecting part; 233. Third connecting part; 234. Protrusion; 240. Power supply connecting piece; 241. Fourth connecting part; 242. Fifth connecting part; 243. Sixth connecting part; 250. Test button; 260. Reset elastic element; 270. Circuit board; 271. First solder groove; 272. Second solder groove; 280. First wire;

[0037] 310, First terminal block; 311, Third connecting bar; 320, Second terminal block; 321, First connecting bar; 3211, Connecting groove; 3212, First wire groove; 330, Second wire;

[0038] 410. First trip unit; 411. Conductive pin; 420. Second trip unit; 421. Electromagnetic coil;

[0039] 500. Zero-sequence current transformer;

[0040] 610. First stationary contact; 611. Second connecting bar; 620. Second stationary contact; 630. Fourth connecting bar; 631. Socket; 632. Second wire groove;

[0041] 700, outer casing; 710, partition plate; 711, first limiting groove; 712, second limiting groove; 720, first cover plate; 721, positioning post; 730, second cover plate;

[0042] 800, Limiting plate. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] Reference Figure 1 As shown, this embodiment provides a circuit breaker, which includes a contact structure and a leakage current test circuit. The contact structure includes a first moving contact 110 and a conductive rod 120 electrically connected to the first moving contact 110. The leakage current test circuit includes a test resistor 210 and a spring contact 220. The test resistor 210 has a first lead 211, and both the first lead 211 and the end of the conductive rod 120 facing the spring contact 220 abut against and are electrically connected to the first surface of the spring contact 220.

[0048] In this embodiment, the first pin 211 of the test resistor 210 and the end of the conductive rod 120 facing the spring 220 are both abutted against and electrically connected to the first surface of the spring 220. The test resistor 210 and the first moving contact 110 are electrically connected by a lap-connection power-taking method, so as to realize that the leakage current test circuit takes power from the first end of the test resistor 210, which effectively reduces the use of wires, that is, reduces the number of wire connection points and soldering points, reduces the risk of short circuit and leakage current test circuit failure, facilitates assembly, and effectively reduces manufacturing costs.

[0049] For example, the end of the first pin 211 is perpendicular to the spring piece 220 or at an angle to the spring piece 220, and the end of the first pin 211 abuts against and is electrically connected to the first surface of the spring piece 220, which is stable and reliable. Of course, the abutment between the first pin 211 and the spring piece 220 can also be in other forms. For example, the end of the first pin 211 is bent into a U-shape, and the bent end of the first pin 211 abuts against and is electrically connected to the first surface of the spring piece 220. This embodiment does not limit this.

[0050] In this embodiment, reference is made to Figures 1 to 4 As shown, the circuit breaker also includes a first terminal 310, the test resistor 210 also has a second pin 212, and the leakage current test circuit also includes a break connection piece 230, a power supply connection piece 240 and a test button 250. The break connection piece 230 is electrically connected to the first terminal 310, the power supply connection piece 240 is electrically connected to the second pin 212, and the test button 250 abuts against the power supply connection piece 240. The test button 250 is used to push the power supply connection piece 240 to contact the break connection piece 230 for conduction. In this embodiment, the power supply connecting piece 240 is pushed against the break connecting piece 230 by the test button 250 to make contact and conduction. That is, a conductive circuit is formed between the first terminal 310, the break connecting piece 230, the power supply connecting piece 240, the test resistor 210, the spring piece 220, the conductive rod 120 and the first moving contact 110, that is, the leakage current test circuit is conducting. Whether the circuit breaker trips is used to determine whether the leakage current protection function of the circuit breaker is normal, which is convenient for operation.

[0051] In one feasible implementation, the leakage current test circuit further includes a reset elastic element 260, which is connected to the test button 250. The reset elastic element 260 enables the test button 250 to tend to move away from the power supply connection piece 240. That is, after pressing the test button 250 to push the power supply connection piece 240 to contact and conduct with the break connection piece 230, the test button 250 is released and reset under the action of the reset elastic element 260, which is stable and reliable and effectively prevents reset jamming.

[0052] For example, the reset elastic element 260 can be a spring.

[0053] In this embodiment, reference is made to Figure 1 , Figure 2 and Figure 4 As shown, the leakage current test circuit also includes circuit board 270.

[0054] In one feasible implementation, both the first pin 211 and the second pin 212 are soldered onto the circuit board 270 to facilitate the positioning and assembly of the test resistor 210. Soldering the first pin 211 to the circuit board 270 can give the first pin 211 good structural strength and effectively ensure the contact stability between the first pin 211 and the spring contact 220.

[0055] In one feasible implementation, one end of the power take-up connector 240 is soldered to the circuit board 270 and electrically connected to the second pin 212 through the circuit board 270, which effectively reduces the number of wire connection points, reduces the risk of short circuit and leakage test circuit failure, facilitates assembly, and effectively reduces manufacturing costs.

[0056] In one feasible embodiment, the circuit breaker further includes a first trip unit 410, which includes a trip coil. The leakage current test circuit also includes a first conductor 280, the first end of which is electrically connected to a first terminal 310. The second end of the first conductor 280, the conductive pin 411 of the first end of the trip coil, and the break-point connecting piece 230 are soldered together, effectively reducing the number of solder joints, lowering the risk of short circuits and leakage current test circuit failure, facilitating assembly, and effectively reducing manufacturing costs. It is understood that the first end of the trip coil and the break-point connecting piece 230 can both be powered by connecting to the first terminal 310 via the first conductor 280. It is understood that when the leakage current test circuit is conducting, the first trip unit 410 will trigger the circuit breaker to trip. The first trip unit 410 is prior art and will not be described in detail in this embodiment.

[0057] In one feasible implementation, the circuit board 270, the second end of the first wire 280, the conductive pin 411 of the first end of the trip coil, and the break connection piece 230 are soldered together, effectively reducing the number of solder joints. It is understood that the circuit board 270 can be electrically connected to the first terminal 310 via the first wire 280. In this embodiment, the circuit breaker also includes a second terminal 320, and the circuit board 270 can be electrically connected to the second terminal 320 via the second wire 330 to achieve power connection between the circuit board 270 and the main circuit.

[0058] For example, the conductive pin 411 at the second end of the trip coil can be soldered onto the circuit board 270, and the conductive pin 411 at the first end of the trip coil can be soldered onto the circuit board 270 to enable the trip coil to draw power from the circuit board 270.

[0059] In one feasible implementation, the circuit board 270 is provided with a first soldering groove 271. The second end of the first wire 280, the conductive pin 411 of the first end of the trip coil and one end of the break connection piece 230 are all inserted into the first soldering groove 271 and soldered together with the circuit board 270, which facilitates positioning and soldering and makes the soldering stable and reliable.

[0060] In one feasible implementation, the circuit board 270 is provided with a second welding groove 272, and one end of the power take-up connector 240 is inserted into the second welding groove 272 and welded together with the circuit board 270, which facilitates positioning and welding, and the welding is stable and reliable.

[0061] In one feasible implementation, the circuit breaker includes an L-pole circuit breaker module and an N-pole circuit breaker module. One of the L-pole circuit breaker module and the N-pole circuit breaker module includes a contact structure, and the other includes a first terminal 310, so that one end of the leakage current test circuit is connected to the L-pole main circuit and the other end of the leakage current test circuit is connected to the N-pole main circuit, so as to realize the connection and power supply between the leakage current test circuit and the main circuit. The power supply connection piece 240 makes contact with the break point connection piece 230 to determine whether the leakage current protection function of the circuit breaker is normal.

[0062] For example, the N-pole circuit breaker module includes a contact structure and a second terminal 320, and the L-pole circuit breaker module includes a first terminal 310.

[0063] It is understandable that the circuit breaker also includes a zero-sequence current transformer 500, and the first terminal 310 and the second terminal 320 both pass through the zero-sequence current transformer 500. The leakage current test circuit does not pass through the zero-sequence current transformer 500.

[0064] In this embodiment, reference is made to Figure 2 and Figure 5 As shown, the circuit breaker also includes a first stationary contact 610 disposed opposite to the first moving contact 110. The contact structure also includes a positioning spring 130. The first end of the positioning spring 130 is connected to the conductive rod 120, and the second end of the positioning spring 130 is connected to the first moving contact 110. When the circuit breaker is closed, the positioning spring 130 provides a force to press the first stationary contact 610 against the first moving contact 110. When the circuit breaker is open, the positioning spring 130 provides a force to keep the first moving contact 110 separated from the first stationary contact 610. In this embodiment, the first moving contact 110 is maintained in its position during opening and closing by the conductive rod 120 and the positioning spring 130. The first moving contact 110 is electrically connected to the test resistor 210 by the positioning spring 130, the conductive rod 120, and the spring piece 220. That is, the circuit breaker can achieve power extraction from the first end of the test resistor 210 for the leakage current test circuit without adding additional conductive components. The structure is compact, easy to assemble, and effectively reduces manufacturing costs. Of course, the conductive rod 120 can also be electrically connected to the first moving contact 110 in other ways, and this embodiment does not limit this.

[0065] It is understood that the first stationary contact 610 is electrically connected to the second terminal block 320, meaning the first stationary contact 610 can be part of the N-pole circuit breaker module. The N-pole circuit breaker module is switched on and off through the contact and separation between the first moving contact 110 and the first stationary contact 610. Exemplarily, the second terminal block 320 has a first connecting strip 321, and the first stationary contact 610 has a second connecting strip 611. The first connecting strip 321 has a connecting groove 3211 and a first wire groove 3212 communicating with the connecting groove 3211. The second connecting strip 611 passes through the zero-sequence current transformer 500 and is inserted into the connecting groove 3211. The second wire 330 is inserted into the first wire groove 3212 for easy assembly. The first connecting strip 321, the second connecting strip 611, and the second wire 330 can be fixed together by welding, ensuring stability and reliability.

[0066] It is understood that the L-pole circuit breaker module also includes a second moving contact (not shown) and a second stationary contact 620. The L-pole circuit breaker module is switched on and off by the contact and separation of the second moving contact and the second stationary contact 620. The second stationary contact 620 is electrically connected to the first terminal 310. Exemplarily, the first terminal 310 has a third connecting bar 311. The L-pole circuit breaker module also includes a fourth connecting bar 630 and an electromagnetic coil 421. The first end of the fourth connecting bar 630 is provided with a socket 631 and a second wire groove 632 communicating with the socket 631. The third connecting bar 311 is inserted into the socket 631. The first wire 280 is inserted into the second wire groove 632. The first end of the electromagnetic coil 421 passes through the zero-sequence current transformer 500 and is connected to the second end of the fourth connecting bar 630. The second end of the electromagnetic coil 421 is connected to the second stationary contact 620. The third connecting bar 311, the fourth connecting bar 630, and the first conductor 280 can be fixed together by welding. In this embodiment, the circuit breaker also includes a second trip unit 420, and the electromagnetic coil 421 can be part of the second trip unit 420. When the circuit breaker is short-circuited, the electromagnetic force generated by the electromagnetic coil 421 can trigger the second trip unit 420 to trip the circuit breaker. The second trip unit 420 is prior art and will not be described in detail in this embodiment.

[0067] It is understood that the circuit breaker also includes an operating mechanism (not shown) connected to both the first moving contact 110 and the second moving contact. The operating mechanism is used to drive the first moving contact 110 and the second moving contact to achieve the opening and closing of the circuit breaker. The operating mechanism is prior art and will not be described in detail in this embodiment.

[0068] For example, the hook at the first end of the positioning spring 130 is attached to the conductive rod 120.

[0069] For example, the first moving contact 110 is provided with a connecting hole 111, and the hook at the second end of the positioning spring 130 is hooked into the connecting hole 111. In this embodiment, the contact structure also includes a positioning rod 140, which passes through the connecting hole 111 to realize the positioning and assembly of the first moving contact 110.

[0070] For example, the connection hole 111 can be triangular, and the hook at the second end of the positioning spring 130 is attached to the first apex of the connection hole 111. When the circuit breaker is closed, the positioning rod 140 abuts against the second apex of the connection hole 111, so that the positioning spring 130 provides a force to the first moving contact 110 to press against the first stationary contact 610. When the circuit breaker is open, the positioning rod 140 abuts against the third apex of the connection hole 111, so that the positioning spring 130 provides a force to the first moving contact 110 to keep it separated from the first stationary contact 610, which is stable and reliable.

[0071] In this embodiment, reference is made to Figure 5 and Figure 6 As shown, the circuit breaker also includes a partition plate 710, on which a first positioning hole (not shown) is provided. The end of the conductive rod 120 facing away from the spring piece 220 is inserted into the first positioning hole to realize the positioning assembly of the conductive rod 120 and effectively ensure that the conductive rod 120 and the spring piece 220 are stably abutted.

[0072] In one feasible embodiment, the partition 710 is also provided with a positioning groove (not shown), and the circuit breaker also includes a limiting plate 800, which is disposed in the positioning groove to realize the positioning assembly of the limiting plate 800; and the first moving contact 110 and the positioning spring 130 are sandwiched between the partition 710 and the limiting plate 800 to prevent the first moving contact 110 and the positioning spring 130 from moving along the axial direction of the conductive rod 120, which is stable, reliable and convenient for assembly.

[0073] For example, in order to ensure the connection of the conductive rod 120 is stable and reliable, the limiting plate 800 is provided with a through hole (not shown) through which the conductive rod 120 can pass.

[0074] In one feasible implementation, the partition 710 is provided with a second positioning hole (not shown), and the end of the positioning rod 140 facing away from the spring piece 220 is inserted into the second positioning hole to realize the positioning assembly of the positioning rod 140.

[0075] For example, in order to ensure the stable and reliable connection of the positioning rod 140, the limiting plate 800 is provided with a groove (not shown) for the positioning rod 140 to be inserted.

[0076] In this embodiment, reference is made to Figure 6 and Figure 7 As shown, the circuit breaker also includes a housing 700, and the contact structure and leakage current test circuit are all located inside the housing 700.

[0077] For example, the partition 710 can be part of the housing 700, that is, the housing 700 includes not only the partition 710, but also a first cover plate 720 and a second cover plate 730. It is understood that an installation space for accommodating the N-pole circuit breaker module is formed between the first cover plate 720 and the partition 710, and an installation space for accommodating the L-pole circuit breaker module is formed between the second cover plate 730 and the partition 710. The partition 710 effectively prevents short circuits between the L-pole circuit breaker module and the N-pole circuit breaker module.

[0078] For example, along the axial direction of the conductive rod 120, the first cover plate 720, the circuit board 270, and the limiting plate 800 abut against each other in sequence to achieve positioning and assembly of the circuit board 270 and the limiting plate 800. In this embodiment, to further limit the circuit board 270, the first cover plate 720 may be provided with a limiting groove (not shown) to accommodate the circuit board 270. Of course, the limiting plate 800 and the circuit board 270 can also be fixed to the partition plate 710 by means of snap-fit ​​or other methods, which is not limited in this embodiment.

[0079] In this embodiment, reference is made to Figure 7 and Figure 8 As shown, the outer casing 700 is provided with a positioning post 721, and the spring piece 220 is provided with a through hole 223. The positioning post 721 is inserted into the through hole 223, and at least a portion of the second surface of the spring piece 220 abuts against the outer casing 700. It can be understood that the first surface and the second surface of the spring piece 220 are two opposite surfaces along the thickness direction of the spring piece 220. In this embodiment, the spring piece 220 is positioned and assembled in the outer casing 700 by inserting the positioning post 721 into the through hole 223, which is convenient and reliable; and at least a portion of the second surface of the spring piece 220 abuts against the outer casing 700, so as to provide a force for the abutment between the first surface of the spring piece 220 and the first pin 211 and the conductive rod 120, effectively ensuring the stability of the electrical connection between the first pin 211 and the conductive rod 120 and the spring piece 220.

[0080] Specifically, the positioning post 721 is located on the first cover plate 720.

[0081] For example, the spring piece 220 has a first conductive part 221 and a second conductive part 222, which are arranged at an angle. The first conductive part 221 abuts against the first pin 211, and the second conductive part 222 abuts against the end of the conductive rod 120 facing the spring piece 220. In this embodiment, the abutment of the first conductive part 221 against the first pin 211 causes a slight deformation of the first conductive part 221, providing a force for the abutment between the first conductive part 221 and the first pin 211. The abutment of the second conductive part 222 against the end of the conductive rod 120 facing the spring piece 220 causes a slight deformation of the second conductive part 222, providing a force for the abutment between the second conductive part 222 and the conductive rod 120. That is, both the first conductive part 221 and the second conductive part 222 deform adaptively, and the deformation between the two has little mutual influence, effectively ensuring that the abutment between the spring piece 220 and the first pin 211 and the conductive rod 120 is stable and reliable.

[0082] In this embodiment, reference is made to Figure 4 As shown, the outer casing 700 is provided with a first limiting groove 711 and a second limiting groove 712. The breakpoint connecting piece 230 is inserted into the first limiting groove 711, and the power taking connecting piece 240 is inserted into the second limiting groove 712 to realize the positioning and assembly of the breakpoint connecting piece 230 and the power taking connecting piece 240, ensuring that the power taking connecting piece 240 can stably resist the breakpoint connecting piece 230 under the pressure of the test button 250.

[0083] Specifically, the first limiting groove 711 and the second limiting groove 712 are both provided on the partition plate 710.

[0084] For example, to ensure that the breakpoint connecting piece 230 is stably installed on the housing 700, the breakpoint connecting piece 230 includes a first connecting portion 231, a second connecting portion 232, and a third connecting portion 233, which are bent in sequence. The first connecting portion 231 and the second connecting portion 232 are both located within the first limiting groove 711, and the first connecting portion 231 is inserted into the first welding groove 271 and welded to the circuit board 270. It is understood that the shape of the first limiting groove 711 is the same as the shape of the first connecting portion 231 and the second connecting portion 232. The third connecting portion 233 is used to abut against the power-taking connecting piece 240.

[0085] For example, to ensure that the power supply connector 240 is stably installed on the housing 700, the power supply connector 240 includes a fourth connecting portion 241, a fifth connecting portion 242, and a sixth connecting portion 243 that are bent in sequence. The fourth connecting portion 241 and the fifth connecting portion 242 are both located within the second limiting groove 712, and the fourth connecting portion 241 is inserted into the second welding groove 272 and welded to the circuit board 270. It is understood that the shape of the second limiting groove 712 is the same as the shape of the fourth connecting portion 241 and the fifth connecting portion 242. The sixth connecting portion 243 is used to abut against the breakpoint connector 230. In this embodiment, the sixth connecting portion 243 can abut against the third connecting portion 233 when pressed by the test button 250.

[0086] For example, to ensure that the power-taking connector 240 and the break connector 230 are stably abutted, the break connector 230 is provided with a protrusion 234 that can abut against the power-taking connector 240. Specifically, the protrusion 234 is provided on the third connecting portion 233.

[0087] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit breaker, characterized in that, include: The contact structure includes a first moving contact (110) and a conductive rod (120) electrically connected to the first moving contact (110); The leakage current test circuit includes a test resistor (210) and a spring (220). The test resistor (210) has a first pin (211). The first pin (211) and the end of the conductive rod (120) facing the spring (220) are both abutted against and electrically connected to the first surface of the spring (220).

2. The circuit breaker according to claim 1, characterized in that, The circuit breaker further includes a first terminal block (310), the test resistor (210) further has a second pin (212), and the leakage current test circuit further includes: The breakpoint connector (230) is electrically connected to the first terminal block (310); The power connector (240) is electrically connected to the second pin (212); The test button (250) abuts against the power supply connector (240), and the test button (250) is used to push the power supply connector (240) to contact and conduct with the breakpoint connector (230).

3. The circuit breaker according to claim 2, characterized in that, The leakage current test circuit also includes a circuit board (270); The first pin (211) and the second pin (212) are both soldered to the circuit board (270); and / or, one end of the power-taking connector (240) is soldered to the circuit board (270) and electrically connected to the second pin (212) through the circuit board (270).

4. The circuit breaker according to claim 2, characterized in that, The circuit breaker further includes a first trip unit (410), which includes a trip coil; the leakage current test circuit further includes a first conductor (280), the first end of which is electrically connected to the first terminal (310), and the second end of the first conductor (280), the conductive pin (411) of the first end of the trip coil, and the break connection piece (230) are welded together.

5. The circuit breaker according to claim 4, characterized in that, The leakage current test circuit also includes a circuit board (270); The circuit board (270) is provided with a first soldering groove (271), and the second end of the first wire (280), the conductive pin (411) of the first end of the trip coil and one end of the breakpoint connecting piece (230) are all inserted into the first soldering groove (271) and soldered together with the circuit board (270); and / or, the circuit board (270) is provided with a second soldering groove (272), and one end of the power taking connecting piece (240) is inserted into the second soldering groove (272) and soldered together with the circuit board (270).

6. The circuit breaker according to claim 2, characterized in that, The circuit breaker includes an L-pole circuit breaker module and an N-pole circuit breaker module. One of the L-pole circuit breaker module and the N-pole circuit breaker module includes the contact structure, and the other includes the first terminal block (310).

7. The circuit breaker according to claim 1, characterized in that, The circuit breaker also includes a housing (700), the contact structure and the leakage current test circuit are both located inside the housing (700), the housing (700) is provided with a positioning post (721), the spring piece (220) is provided with a through hole (223), the positioning post (721) is inserted into the through hole (223), and at least a portion of the second side of the spring piece (220) abuts against the housing (700).

8. The circuit breaker according to claim 1, characterized in that, The spring (220) has a first conductive part (221) and a second conductive part (222) arranged at an angle. The first conductive part (221) abuts against the first pin (211), and the second conductive part (222) abuts against one end of the conductive rod (120) facing the spring (220).

9. The circuit breaker according to any one of claims 1-8, characterized in that, The circuit breaker also includes a first stationary contact (610) disposed opposite to the first moving contact (110). The contact structure also includes a positioning spring (130). The first end of the positioning spring (130) is connected to the conductive rod (120), and the second end of the positioning spring (130) is connected to the first moving contact (110). When the circuit breaker is closed, the positioning spring (130) provides a force to the first moving contact (110) to compress the first stationary contact (610). When the circuit breaker is open, the positioning spring (130) provides a force to the first moving contact (110) to keep it separated from the first stationary contact (610).

10. The circuit breaker according to claim 9, characterized in that, The circuit breaker also includes: The partition (710) is provided with a first positioning hole and a positioning groove, and the end of the conductive rod (120) facing away from the spring piece (220) is inserted into the first positioning hole; A limiting plate (800) is disposed in the positioning groove, and the first moving contact (110) and the positioning spring (130) are sandwiched between the partition plate (710) and the limiting plate (800).

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