Circuit breaker

Abstract

A circuit breaker comprises a shell, at least two pairs of wiring terminals and an electric leakage protection module, a phase of main circuit is connected between each pair of wiring terminals, all the main circuits at least comprise a phase of L-pole main circuit and a phase of N-pole main circuit, the electric leakage protection module comprises a circuit board and a mutual inductor, the mutual inductor is connected to the circuit board and coupled to all the main circuits, and the mutual inductor is connected to the circuit board. The L-pole main circuit and the N-pole main circuit are connected in series, a current-conducting plate is also connected in series in each phase of main circuit, at least partial areas of the current-conducting plates and the circuit board are correspondingly stacked on the same end face of the mutual inductor, each current-conducting plate is connected with an adjacent wiring terminal of the mutual inductor, the circuit board is connected with two electricity-taking poles, and the two electricity-taking poles are respectively connected with the two current-conducting plates in the L-pole main circuit and the N-pole main circuit. According to the utility model, the current-conducting plate and the circuit board which are connected to the main circuit are stacked on the same end face of the mutual inductor, so that two electricity-taking poles connected to the circuit board can be conveniently connected to take electricity from the current-conducting plate connected to the L-pole main circuit and the N-pole main circuit, the occupied space is smaller, and the connection is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low-voltage apparatus, specifically relates to a circuit breaker. BACKGROUND

[0002] The circuit breaker is a common switch device, which is mainly used for infrequent opening and closing of power distribution lines, overload or short circuit protection of power distribution lines and equipment, and automatic circuit breaking when serious overload or short circuit fault of power distribution lines or equipment occurs.

[0003] At present, the circuit breaker usually has a leakage protection function, and the leakage protection function is usually completed by mutual inductors, circuit boards, tripping devices and leakage test mechanisms. The circuit board is usually connected to the power supply through wires, and the mutual inductor needs to be coupled to each phase main line of the circuit breaker, and the wires of each phase main line pass through the center hole, so that the product has a large number of wires inside. Due to the bending and winding of the wires, the internal wiring is messy, which is not conducive to assembly and wiring. SUMMARY

[0004] The utility model discloses a circuit breaker which overcomes at least one defect of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a circuit breaker, including the shell, be provided with at least two pairs of terminal in the shell, be connected with one phase main line between each pair of terminal, all main lines at least include one phase L pole main line and one phase N pole main line, still be provided with leakage protection module in the shell, leakage protection module includes circuit board and mutual inductor, mutual inductor is connected on circuit board and is coupled on all main lines,

[0007] Each phase main line also has a conductive plate in series, the conductive plate and the circuit board are at least partially stacked on the same end face of the mutual inductor, and each conductive plate is connected to the terminal adjacent to the mutual inductor, the circuit board is connected with two power supply rods, and the two power supply rods are connected to the two conductive plates in the L pole main line and the N pole main line.

[0008] Preferably, one end of the conductive plate is provided with a clamping groove for clamping the power supply rod.

[0009] Preferably, the shell is provided with at least one partition plate, the space in the shell is divided into at least two assembly spaces by the partition plate, a pair of terminals is arranged at both ends of each assembly space, and the mutual inductor, the circuit board and the conductive plate are arranged in the same assembly space.

[0010] Preferably, the leakage protection module further includes a test button and a leakage test circuit. The leakage test circuit includes a conductive spring and a stationary contact that are spaced apart and form a break point. The first power-taking end of the conductive spring is connected to the circuit board, and the second power-taking end of the stationary contact and a power-taking rod are connected to the circuit board together.

[0011] Preferably, the conductive plate connected to the L-pole main circuit is an L-pole conductive plate, and the conductive plate connected to the N-pole main circuit is an N-pole conductive plate. The stationary contact piece is connected to the L-pole conductive plate through a power-taking rod.

[0012] Preferably, at least one short-circuit protection mechanism is provided inside the housing. The short-circuit protection mechanism includes an electromagnetic coil, one terminal of which passes through the center hole of the transformer and is connected to the L-pole conductive plate.

[0013] Preferably, the L-polar conductive plate is bent in the middle so that the two ends of the L-polar conductive plate are set at an angle on the same plane. A slot is opened at one end of the L-polar conductive plate, and the other end of the L-polar conductive plate is stacked on the current transformer. A connecting groove is opened at the other end of the L-polar conductive plate, and the connecting groove is used to connect with the terminal.

[0014] Preferably, the N-pole conductive plate is bent in the middle so that both ends of the N-pole conductive plate extend on two planes respectively. One end of the N-pole conductive plate is provided with a slot and is stacked on the current transformer. The other end of the N-pole conductive plate is connected to the wiring terminal adjacent to the current transformer.

[0015] Preferably, the N-pole main circuit is connected to an N-pole contact mechanism, which includes a cooperating N-pole moving contact and an N-pole stationary contact. The leakage current test circuit also includes a test resistor, which is disposed on the circuit breaker. The test resistor and the N-pole moving contact are electrically connected to the same conductive shaft disposed inside the housing.

[0016] Preferably, the power-taking rod and the conductive shaft correspond to the front and back sides of the circuit board, respectively, and a power-taking spring is connected between the N-pole moving contact and the conductive shaft, which provides the closing force for the N-pole moving contact.

[0017] Preferably, each pair of terminals is divided into an incoming terminal and an outgoing terminal, the current transformer is adjacent to the outgoing terminal, and the conductive plate is connected to the adjacent outgoing terminal.

[0018] In this invention, the conductive plate and circuit board connected to the main line are both stacked on the same end face of the current transformer. This allows the two power-taking rods connected to the circuit board to draw power from the conductive plates connected to the L-pole and N-pole main lines. Compared to using wires, the power-taking rods and conductive plates do not bend or entangle, occupy less space, and are easier to connect.

[0019] In addition, the conductive plate simplifies the wiring process and facilitates assembly by using a slot to engage with the power-collecting pole.

[0020] In addition, one terminal of the electromagnetic coil of the short-circuit protection mechanism passes through the central hole of the transformer and is connected to the L pole conductive plate. In particular, the terminal is connected to the L pole conductive plate through a connecting groove, which simplifies the wiring method.

[0021] In addition, the leakage current test circuit is connected to the N-pole moving contact on the same conductive shaft through the test resistor, which simplifies the power connection between the test resistor and the N-pole main circuit. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the leakage protection module in the circuit breaker of this utility model;

[0023] Figure 2 This is a schematic diagram of the leakage protection module and the N-pole moving contact in the circuit breaker of this utility model (excluding the circuit board);

[0024] Figure 3 This is a schematic diagram of the cooperation between the conductive spring and the stationary contact in this utility model;

[0025] Figure 4 This is a schematic diagram of the cooperation between the conductive rod and the conductive plate in this utility model;

[0026] Figure 5 This is a schematic diagram of the conductive spring sheet in this utility model;

[0027] Figure 6 This is a side view of the conductive spring sheet in this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the stationary contact piece in this utility model;

[0029] Figure 8 This is a side view of the stationary contact piece in this utility model;

[0030] Figure 9 This is a schematic diagram of the circuit board and test resistor in this utility model;

[0031] Reference numerals: 1-Outer shell, 10-Partition plate, 11-Button hole, 12-Mounting platform, 2-N-pole moving contact, 21-Power spring, 3-Inductor, 4-Circuit board, 41-Power extraction slot, 51-Indicator, 52-Trip device, 53-Push plate, 60-Test button, 61-Conductive spring, 611-First power extraction terminal, 612-Moving contact, 613-Connecting part, 614-Limiting groove, 62-Stationary contact, 621-Second power extraction terminal, 622-Stationary contact, 623-Contact, 63-Test resistor, 631-Connecting terminal, 70-Slot, 71-L-pole conductive plate, 711-Connecting groove, 72-N-pole conductive plate, 73-Power extraction rod, 74-Conductive shaft, 8-Short circuit protection mechanism, 81-Electromagnetic coil, 811-Terminal, 9-Terminal terminal. Detailed Implementation

[0032] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0033] The circuit breaker includes a housing 1, and at least one circuit breaker pole is provided inside the housing 1. The circuit breaker pole includes a pair of terminals 9, each pair of terminals 9 being spaced apart at opposite ends of the housing 1. A main phase circuit is connected between each pair of terminals 9. Each main phase circuit is controlled to be connected or disconnected by a contact mechanism connected in series therewith. Each main phase circuit is an N-pole main circuit or an L-pole main circuit. Typically, the housing 1 is provided with at least one L-pole main circuit and at least one N-pole main circuit.

[0034] The housing 1 also houses a leakage current protection module, which includes a current transformer 3, a circuit board 4, a tripping device, and a leakage current testing mechanism. The current transformer 3 is connected to the circuit board 4 and coupled to all the main circuits within the circuit breaker. The tripping device is also connected to the circuit board 4. When the current transformer 3 detects leakage current on the main circuit, it feeds back to the controller on the circuit board 4, which then outputs a control signal to drive the tripping device. The leakage current testing mechanism includes a test button 60 and a leakage current testing circuit. The test button 60 is slidably mounted on the housing 1. In other words, the outer casing 1 is provided with a button hole 11, and the test button 60 is slidably mounted in the button hole 11. The leakage test circuit is connected to one phase L pole main line and N pole main line. The leakage test circuit includes a conductive spring 61 and a stationary contact 62 that form a break point at intervals. The test button 60 controls the connection and disconnection of the break point. When the leakage test circuit is connected, a simulated leakage current will be generated. After the current transformer 3 collects the simulated leakage current in the main line, it feeds back to the controller of the circuit board 4. The controller outputs a control signal to drive the tripping device to act.

[0035] The improvement of this application is that a conductive plate is connected in series in each phase main line. The conductive plate and the circuit board 4 are at least partially stacked on the same end face of the current transformer 3. Each conductive plate is connected to the adjacent terminal 9 of the current transformer 3. The circuit board 4 is connected to two power taking rods 73. The two power taking rods 73 are respectively connected to two conductive plates in the L pole main line and the N pole main line.

[0036] Thus, the conductive plate and circuit board 4 connected to the main line are both stacked on the same end face of the transformer 3, which makes it convenient for the two power taking rods 73 connected to the circuit board 4 to connect and take power from the conductive plates connected to the L pole main line and the N pole main line. Compared with using wires, the power taking rods 73 and the conductive plate will not be bent or tangled, occupy less space and are easier to connect.

[0037] Specifically, the housing 1 has at least one partition 10, which divides the space inside the housing 1 into at least two assembly spaces. Each assembly space has a pair of terminals 9 at both ends. The current transformer 3, the circuit board 4, and the conductive plate are arranged in the same assembly space. Alternatively, each assembly space can be understood as having a circuit breaker pole. The circuit breaker pole is divided into an L pole and an N pole. The main line between a pair of terminals 9 in the L pole is the L pole main line, and the main line between a pair of terminals 9 in the N pole is the N pole main line. The leakage protection module can be arranged in a separate assembly space or in the same assembly space as a circuit breaker pole. Usually, the leakage protection module and the N pole are located in the same assembly space.

[0038] Preferably, a slot 70 for engaging the power take-up rod 73 is provided at one end of the conductive plate, and the power take-up rod 73 engages with the slot 70, which simplifies the wiring method.

[0039] Combination Figures 1-9 A specific embodiment of a circuit breaker is provided.

[0040] like Figure 1 , 2 As shown, the circuit breaker includes a housing 1, and a partition 10 is provided inside the housing 1. The partition 10 divides the space inside the housing 1 into two parallel assembly spaces. Each assembly space is provided with a circuit breaker pole. Each circuit breaker pole includes a pair of terminals 9. Each pair of terminals 9 is spaced apart at both ends of the housing 1. A main line is connected between each pair of terminals 9. Each pair of terminals 9 includes an input terminal and an output terminal. The input terminal is used to connect to the power supply terminal, and the output terminal is used to connect to the load. In this embodiment, one circuit breaker pole is the L pole, and the other circuit breaker pole is the N pole. The main line connected between the pair of terminals 9 in the L pole is the L pole main line, and the main line connected between the pair of terminals 9 in the N pole is the N pole main line.

[0041] Furthermore, such asFigure 1 , 2 As shown in Figure 4, each phase of the main circuit has a conductive plate connected in series. Each conductive plate is connected to an adjacent terminal 9. In this embodiment, each conductive plate is connected to an adjacent outgoing terminal. The conductive plate connected to the L-pole main circuit is the L-pole conductive plate 71, and the conductive plate connected to the N-pole main circuit is the N-pole conductive plate 72. In this embodiment, the other structures of the L-pole and N-pole can adopt existing technology. That is, the L-pole includes an operating mechanism and an L-pole contact mechanism. The operating mechanism is rotatably mounted in the housing 1. The L-pole contact mechanism includes a mutually cooperating L-pole moving contact and an L-pole stationary contact. The L-pole moving contact is connected to the operating mechanism, and the operating mechanism drives the L-pole moving contact to contact or separate from the L-pole stationary contact, thereby controlling the connection and disconnection of the L-pole main circuit. The N pole includes at least an N pole contact mechanism for controlling the connection and disconnection of the N pole main line. The N pole contact mechanism includes a mutually cooperating N pole moving contact 2 and an N pole stationary contact. The N pole moving contact 2 is rotatably mounted inside the housing 1. The N pole moving contact 2 is provided with a spring hole, and a power-taking spring 21 is connected to the spring hole. The power-taking spring 21 is connected to a conductive shaft 74 located inside the housing 1. The N pole moving contact 2 can be driven by the L pole operating mechanism or the L pole moving contact to swing open and close. The power-taking spring 21 can generate elastic deformation when the N pole moving contact 2 swings open and close, and the power-taking spring 21 provides the closing force for the N pole moving contact 2. The operating mechanism, the L pole contact mechanism, and the N pole contact mechanism can adopt existing structures.

[0042] Additionally, a protection mechanism that cooperates with the operating mechanism can also be configured inside the housing 1. In this embodiment, the protection mechanism is configured in the L pole. The protection mechanism includes a short-circuit protection mechanism 8 and / or an overload protection mechanism. When a short-circuit fault occurs in the main line, the short-circuit protection mechanism 8 triggers the operating mechanism to trip, thereby causing the circuit breaker to trip and disconnect the power. In this embodiment, such as Figure 1 , 4 As shown, the short-circuit protection mechanism 8 is an electromagnetic trip unit 52. The electromagnetic coil 81 of the short-circuit protection mechanism 8 is connected to the L pole main line. When an overload fault occurs in the main line, the overload protection mechanism triggers the operating mechanism to trip, thereby causing the circuit breaker to trip and disconnect the power.

[0043] In this embodiment, a leakage protection module is also provided inside the outer casing 1, such as... Figures 1-3As shown, the leakage current protection module and the N pole are located in the same assembly space. The leakage current protection module includes a current transformer 3, a circuit board 4, a tripping device, and a leakage current testing mechanism. The current transformer 3, circuit board 4, and tripping device can adopt existing technologies. The current transformer 3 is located on the side near the outgoing terminal. The current transformer 3 usually corresponds to the short-circuit protection mechanism 8 in the L pole. The current transformer 3 is connected to the circuit board 4 and coupled to the L pole main line and the N pole main line. The current transformer 3 can feed back the collected leakage current to the controller on the circuit board 4. The controller outputs a signal to drive the connected tripping device to operate. The circuit board 4 is connected to the L pole main line. Preferably, on the main L and N lines, the circuit board 4 draws power from the load side of the main L and N lines. A portion of the circuit board 4 and a portion of the conductive plate are stacked on the same end face of the current transformer 3. Preferably, two power-drawing rods 73 are connected to the circuit board 4, and the two power-drawing rods 73 are located on the same side of the circuit board 4. The middle of each power-drawing rod 73 can be bent at least once according to the internal structure of the circuit breaker, so that the circuit board 4 draws power from the load side of the main L and N lines through the two power-drawing rods 73. The two power-drawing rods 73 are respectively connected to two conductive plates connected to the main N line. Figure 1 , 2 As shown in Figure 4, each conductive plate has a slot 70 at one end for engaging the power-collecting rod 73. Each power-collecting rod 73 is engaged in one slot 70, which simplifies wiring and facilitates assembly.

[0044] Combination Figure 1 , 2 4 provides an L-polar conductive plate 71 and an N-polar conductive plate 72 for use in this embodiment, such as Figure 1 , 2 As shown, the L-polar conductive plate 71 is generally strip-shaped. The middle of the L-polar conductive plate 71 is bent so that the two ends of the L-polar conductive plate 71 are set at an angle on the same plane. A slot 70 is opened at one end of the L-polar conductive plate 71 (see...). Figure 4 The other end of the L-polar conductive plate 71 is stacked on the current transformer 3, and a connecting groove 711 is provided at the other end of the L-polar conductive plate 71 (see...). Figure 4 In this embodiment, the L-pole conductive plate 71 is connected in series with the electromagnetic coil 81 of the short-circuit protection mechanism 8. One terminal 811 of the electromagnetic coil 81 is electrically connected to the L-pole contact mechanism, and the other terminal 811 passes through the central hole of the transformer 3 and connects to the L-pole conductive plate 71. Preferably, the other terminal 811 of the electromagnetic coil 81 passes through the central hole of the transformer 3 and engages with the connecting groove 711 of the L-pole conductive plate 71. The diameter of the connecting groove 711 matches the terminal 811 of the electromagnetic coil 81. Figure 1 , 2As shown in Figure 4, the middle part of the N-pole conductive plate 72 is bent so that the two ends of the N-pole conductive plate 72 extend on two planes respectively. One end of the N-pole conductive plate 72 has a slot 70 and is stacked on the current transformer 3. The other end of the N-pole conductive plate 72 is connected to the terminal 9 adjacent to the current transformer 3.

[0045] In this embodiment, as Figure 1 , 2 As shown, the tripping device typically includes a trip unit 52, a push plate 53, and an indicator 51. The trip unit 52 is connected to the circuit board 4. The push plate 53 is rotatably mounted on one side of the moving iron core of the trip unit 52 and is used to trigger the tripping of the operating mechanism in the L pole. The push plate 53 and the indicator 51 are in a limiting engagement. The indicator 51 is slidably disposed in an indicator hole opened on the housing 1. When the trip unit 52 is driven by the controller, the moving iron core drives the push plate 53 to rotate and triggers the tripping of the operating mechanism in the L pole. After the push plate 53 and the indicator 51 are released from the limiting engagement, the indicator 51 pops out from the indicator hole.

[0046] like Figures 1-3 As shown in Figure 5-8, the leakage current testing mechanism includes a test button 60 and a leakage current testing circuit. The test button 60 can adopt existing technology and is slidably disposed in a button hole 11 opened on the housing 1. The leakage current testing circuit draws power from the L-pole main line and the N-pole main line. The leakage current testing circuit includes conductive springs 61 and stationary contacts 62 that are spaced apart and form a break. Figure 3 In the circuit board 4, the conductive spring 61 and the stationary contact 62 are respectively disposed on opposite sides of the button hole 11. The circuit board 4 is provided with two power-taking slots 41 corresponding to the edge of the button hole 11. The first power-taking end 611 of the conductive spring 61 and the second power-taking end 621 of the stationary contact 62 are respectively snapped into the two power-taking slots 41 and electrically connected to the circuit board. The test button 60 and the conductive spring 61 are located on the same side of the button hole 11. The test button 60 is connected to the conductive spring 61. The test button 60 drives the moving contact part 612 of the conductive spring 61 to approach or move away from the stationary contact part 622 of the stationary contact 62, thereby connecting or disconnecting the leakage current test circuit.

[0047] In this embodiment, a mounting platform 12 protrudes from one side of the button hole 11. Figures 1-3In it, the installation table 12 is integrally a rectangular convex block, and the side of the installation table 12 facing the button hole 11 is an inclined slope. The static contact piece 62 is fixedly arranged along the surface of the installation table 12, and the static contact part 622 is fixedly adhered to the inclined slope of the installation table 12. The second power-taking end 621 of the static contact piece 62 is arranged along the installation table 12 on the side opposite to the inclined slope. The moving contact part 612 and the first power-taking end 611 of the conductive elastic piece 61 are respectively bent and extended in the direction close to the other side of the button hole 11. That is, the moving contact part 612 and the first power-taking end 611 are respectively bent and extended in the direction of the side where the installation table 12 is provided. Among them, the moving contact part 612 extends along the inclined direction, so that the moving contact part 612 and the static contact part 622 are spaced opposite to each other in the button hole 11. The test button 60 is connected to the side of the moving contact part 612 opposite to the static contact part 622. When the test button 60 is pressed, the moving contact part 612 undergoes elastic deformation, so that the moving contact part 612 contacts the static contact part 622, thereby connecting the leakage test circuit. The first power-taking end 611 of the conductive elastic piece 61 is bent and extended in the direction close to the other side of the button hole 11. The first power-taking end 611 and the second power-taking end 621 are spaced opposite to each other and are correspondingly clamped into another power-taking groove 41 on the circuit board 4. The conductive elastic piece 61 and the static contact piece 62 are respectively clamped and take power from the two power-taking grooves 41, reducing the usage amount of wires and facilitating wiring and assembly.

[0048] Combined with Figures 1-3 , 5 and 6 provide a structure of the conductive elastic piece 61 applied to this embodiment. The conductive elastic piece 61 includes a plate-shaped elastic piece body. One end of the elastic piece body extends obliquely to one side to form a moving contact part 612, and a connecting part 613 is provided at the end of the moving contact part 612. Figure 3 In it, the connecting part 613 and the moving contact part 612 are jointly connected to one end of the test button 60, which can further enhance the cooperation stability between the test button 60 and the conductive elastic piece 61. The other end of the elastic piece body is bent and extended to one side to form a first power-taking end 611, and the moving contact part 612 and the first power-taking end 611 are located on the same side of the elastic piece body, so that the conductive elastic piece 61 is integrally in a "C" shape. When the conductive elastic piece 61 is arranged in the button hole 11, the middle part of the conductive elastic piece 61 is adhered to one side hole wall of the button hole 11, and the moving contact part 612 and the first power-taking end 611 of the conductive elastic piece 61 surround the outside of the static contact piece 62; in addition, as Figure 5 shown, a limiting groove 614 can also be opened in the middle part of the conductive elastic piece 61, and the limiting groove 614 is engaged with the limiting convex platform on the outer shell 1 or the partition 10, so as to cooperate with and limit the conductive elastic piece 61.

[0049] Combined with Figures 1-3, 7 and 8 provide a structure of the static contact piece 62 applying this embodiment. The static contact piece 62 includes a plate-shaped conductive piece. One end of the conductive piece extends obliquely to one side to form a static contact portion 622. At least one contact point 623 is convexly provided on the surface of the static contact portion 622, which is beneficial to ensuring the connection points when the moving contact portion 612 cooperates with the static contact portion 622. The other end of the conductive piece extends and bends to one side to form a second power-taking end 621, and the static contact portion 622 and the second power-taking end 621 are located on the same side of the conductive piece, making the whole static contact piece 62 in a "C" shape. When the static contact piece 62 is arranged on the mounting table 12, the static contact piece 62 is arranged to fit along three surfaces of the mounting table 12, and the static contact portion 622 is fixed on the inclined surface of the mounting table 12.

[0050] As Figure 2 , 9 shown, at least one test resistor 63 is further connected in the leakage test circuit. The test resistor 63 is arranged on the circuit board 4. Preferably, the test resistor 63 and the power-taking rod 73 are respectively arranged on the front and back sides of the circuit board 4. Usually, the two connection ends 631 of the test resistor 63 are inserted into the jacks of the circuit board 4. In this embodiment, the first power-taking end 611 takes power from the N-pole main line through the test button 60, and the second power-taking end 621 takes power from the L-pole main line. That is, one end of the power-taking rod 73 connected to the L-pole conductive plate 71 is connected to the second power-taking end 621 and they are jointly arranged in the same power-taking groove 41. A conductive shaft 74 is arranged in the housing 1. The conductive shaft 74 is on the same side of the circuit board 4 as the test resistor 63, and the conductive shaft 74 is adjacent to one connection end 631 of the test resistor 63. The power-taking spring 21 connected to the N-pole moving contact 2 is electrically connected to the test resistor 63 on the same conductive shaft 74, thereby realizing the N-pole power-taking of the leakage test circuit.

[0051] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when in use and commonly placed, and is only for the convenience of description, rather than indicating that the indicated device or element must have a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0052] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing (1), wherein at least two pairs of terminals (9) are provided inside the housing (1), each pair of terminals (9) is connected to a phase main line, and all main lines include at least one phase L-pole main line and one phase N-pole main line. The housing (1) also includes a leakage current protection module, the leakage current protection module comprising a circuit board (4) and a current transformer (3), the current transformer (3) being connected to the circuit board (4) and coupled to all main lines. Its features are: Each phase of the main circuit also has a conductive plate connected in series. The conductive plate and the circuit board (4) are at least partially stacked on the same end face of the transformer (3). Each conductive plate is connected to the adjacent terminal (9) of the transformer (3). The circuit board (4) is connected to two power taking rods (73). The two power taking rods (73) are respectively connected to two conductive plates in the L pole main circuit and the N pole main circuit.

2. The circuit breaker according to claim 1, characterized in that: One end of the conductive plate is provided with a slot (70) for engaging the power receiving rod (73).

3. The circuit breaker according to claim 1, characterized in that: The housing (1) is provided with at least one partition (10), which divides the space inside the housing (1) into at least two assembly spaces. Each assembly space is provided with a pair of terminals (9) at both ends. The current transformer (3), the circuit board (4) and the conductive plate are arranged in the same assembly space.

4. The circuit breaker according to any one of claims 1-3, characterized in that: The leakage protection module also includes a test button (60) and a leakage test circuit. The leakage test circuit includes a conductive spring (61) and a stationary contact (62) that are spaced apart and form a break. The first power-taking end (611) of the conductive spring (61) is connected to the circuit board (4), and the second power-taking end (621) of the stationary contact (62) and a power-taking rod (73) are connected to the circuit board (4).

5. The circuit breaker according to claim 4, characterized in that: The conductive plate connected to the L pole main circuit is the L pole conductive plate (71), and the conductive plate connected to the N pole main circuit is the N pole conductive plate (72). The stationary contact piece (62) is connected to the L pole conductive plate (71) through a power-taking rod (73).

6. The circuit breaker according to claim 5, characterized in that: The housing (1) is provided with at least one short-circuit protection mechanism (8), which includes an electromagnetic coil (81). One terminal (811) of the electromagnetic coil (81) passes through the center hole of the transformer (3) and is connected to the L pole conductive plate (71).

7. The circuit breaker according to claim 6, characterized in that: The L-polar conductive plate (71) is bent in the middle so that the two ends of the L-polar conductive plate (71) are set at an angle on the same plane. A slot (70) is opened at one end of the L-polar conductive plate (71), and the other end of the L-polar conductive plate (71) is stacked on the current transformer (3). A connecting groove (711) is opened at the other end of the L-polar conductive plate (71), and the connecting groove (711) is used to connect with the terminal (811).

8. The circuit breaker according to claim 5, characterized in that: The N-pole conductive plate (72) is bent in the middle so that the two ends of the N-pole conductive plate (72) extend on two planes respectively. One end of the N-pole conductive plate (72) is provided with a slot (70) and is stacked on the current transformer (3). The other end of the N-pole conductive plate (72) is connected to the terminal (9) adjacent to the current transformer (3).

9. The circuit breaker according to claim 4, characterized in that: The N-pole main circuit is connected to an N-pole contact mechanism, which includes a mutually cooperating N-pole moving contact (2) and an N-pole stationary contact. The leakage current test circuit also includes a test resistor (63), which is installed on the circuit breaker. The test resistor (63) and the N-pole moving contact (2) are electrically connected on the same conductive shaft (74) installed inside the housing (1).

10. The circuit breaker according to claim 9, characterized in that: The power-taking rod (73) and the conductive shaft (74) correspond to the front and back sides of the circuit board (4) respectively. A power-taking spring (21) is connected between the N-pole moving contact (2) and the conductive shaft (74), and the power-taking spring (21) provides the closing force for the N-pole moving contact (2).

11. The circuit breaker according to claim 1, characterized in that: Each pair of terminals (9) is divided into an incoming terminal and an outgoing terminal. The current transformer (3) is adjacent to the outgoing terminal, and the conductive plate is connected to the adjacent outgoing terminal.

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