N-pole module assembly of circuit breaker and circuit breaker

Abstract

The invention relates to an N-pole module assembly of a circuit breaker and the circuit breaker. The N-pole module assembly of the circuit breaker comprises a main body function module and a current detection module, and further comprises a first N-pole conductive plate fixedly integrated on the main body function module and a second N-pole conductive plate fixedly integrated on the current detection module, and the main body function module and the current detection module are respectively two independent modular structures. And the first N-pole current-conducting plate and the second N-pole current-conducting plate are fixedly and electrically connected to form an N-pole electric loop. According to the invention, the complicated bending and wiring process of the soft wire in the N-pole module assembly in the prior art is avoided, the assembly is convenient, and the automatic assembly can be realized. Moreover, through the special arrangement of the relative positions of the N-pole electric loop and the L-pole electric loop, the Lorentz force generated by the magnetic field generated by the current on the N-pole electric loop on the electric arc in the circuit breaker unit can assist the electric arc to be further pushed and lengthened, and the effect of enhancing the magnetic quenching function can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of switching electrical appliances, and in particular to a circuit breaker N-pole module assembly and a circuit breaker. BACKGROUND

[0002] The residual current circuit breaker with overcurrent protection function is widely used in power grid, residence, commercial building, industrial equipment, new energy equipment, etc. as the protection electrical appliance at the end of the terminal line. It provides overload protection, short circuit protection and leakage protection for the line. When the leakage current exceeds the specified value, the residual current circuit breaker can quickly cut off the circuit in a very short time to protect the human body and electrical equipment. At the same time, it can also be used as a switch to close or open the line to achieve the function of power supply and power off.

[0003] The residual current circuit breaker with overcurrent protection function usually includes single-phase single-line, single-phase double-line, three-phase three-line and three-phase four-line types. The single-phase double-line and three-phase four-line types are circuit breakers with N-pole. In the N-pole unit of the prior art circuit breaker, as shown in Figure 1 and Figure 2 , the N-pole wire is generally made of soft wire. The N-pole wire spans across the entire N-pole unit. In order to make room for other components in the N-pole unit (for example, to make room for the electronic component board), the N-pole wire needs to be bent and wired in a complex way. The two ends of the N-pole wire also need to be electrically connected to the load side conductive plate and the power supply side conductive plate through welding and other processes. The entire assembly process is too complicated and inconvenient. Moreover, the N-pole wire made of soft wire cannot be modularly installed during production and installation, and can only be assembled manually, which cannot be automated, resulting in low production efficiency and high manufacturing cost. In addition, the N-pole wire made of soft wire needs to use conductors with insulation, which has few material options and is relatively expensive for small load current specifications.

[0004] Moreover, the N-pole conductor in the prior art extends in an upward U-shaped arrangement, which also has a problem that the magnetic field generated by the N-pole conductor tends to slow down the arc extinction speed in the L-pole unit of the circuit breaker, which adversely affects the arc extinction of the L-pole, making the arc extinction time longer and the energy larger, resulting in poor short circuit capability, electrical life and reliability of the circuit breaker, and reduced performance. In order to solve this problem, the prior art usually adds a magnetic plate and an expensive gas generating plate material in the arc transfer area and the contact area to improve the arc magnetic blowing effect and the arc transfer speed, thereby meeting the short circuit demand and electrical life performance, but this results in a significant increase in cost. SUMMARY

[0005] To solve the above problems, the present application provides a structure-optimized N-pole module assembly of a circuit breaker, and a circuit breaker with the N-pole module assembly of the circuit breaker.

[0006] This invention is achieved using the following technical solution: This invention proposes an N-pole module assembly for a circuit breaker, comprising a main functional module and a current detection module, and further comprising a first N-pole conductive plate fixedly integrated in the main functional module and a second N-pole conductive plate fixedly integrated in the current detection module. Both the first and second N-pole conductive plates are rigid conductive materials. The main functional module with the first N-pole conductive plate and the current detection module with the second N-pole conductive plate are two independent modular structures. The first and second N-pole conductive plates are fixedly electrically connected to form an N-pole circuit, and the current detection module is fixedly connected to the main functional module as a whole through the fixed connection of the first and second N-pole conductive plates.

[0007] In one embodiment, the module further includes a first terminal block and a second terminal block. The main functional module includes a housing. The main body of the first N-pole conductive plate is fixed inside the housing. The first terminal block is fixedly installed at one end of the housing. The first end of the first N-pole conductive plate protrudes outside the housing. The second end of the first N-pole conductive plate and the first terminal block are fixedly electrically connected. The second terminal block is fixedly disposed in the current detection module. The first end of the second N-pole conductive plate and the second terminal block are fixedly electrically connected. The second end of the second N-pole conductive plate protrudes outside the current detection module. The first end of the first N-pole conductive plate and the second end of the second N-pole conductive plate are fixedly electrically connected.

[0008] In one embodiment, the first terminal located at one end of the housing and the first end of the first N-pole conductive plate exposed on the housing are two opposite ends on the housing, and the first N-pole conductive plate extends through the opposite ends on the housing.

[0009] In one embodiment, the main functional module includes a housing, inside which an electronic component board mounting cavity is formed. In the height direction of the circuit breaker, the N-pole electrical circuit composed of the first N-pole conductive plate and the second N-pole conductive plate has an upwardly inverted "U"-shaped bend to make way for the mounting cavity.

[0010] In one embodiment, an insulating cover plate is further included, which covers and is fixed to the first N-pole conductive plate to achieve dielectric isolation between the first N-pole conductive plate and the electronic component board.

[0011] In one embodiment, the current detection module includes a current transformer, a second N-pole conductive plate passing through the current transformer, and the portion of the second N-pole conductive plate passing through the current transformer is a U-shaped bend, with the second N-pole conductive plate offset radially outward from the current transformer.

[0012] In one embodiment, both the first N-pole conductive plate and the second N-pole conductive plate are integral stamped parts.

[0013] In one embodiment, the end of the first N-pole conductive plate that is in electrical contact with the external wire has an uneven, rough surface, and / or, the end of the second N-pole conductive plate that is in electrical contact with the external wire has an uneven, rough surface.

[0014] In one embodiment, a T-shaped limiting head is provided at the end of the first N-pole conductive plate for hooking and engaging with the outer shell of the main functional module to achieve anti-detachment limiting, and / or, a T-shaped limiting head is provided at the end of the second N-pole conductive plate for hooking and engaging with the current detection module to achieve anti-detachment limiting.

[0015] Based on the above, the present invention also proposes a circuit breaker, including a circuit breaker unit and an N-pole module assembly, wherein the N-pole module assembly is the N-pole module assembly of the circuit breaker as described above.

[0016] The present invention also proposes another circuit breaker, including a circuit breaker unit and an N-pole module assembly. The circuit breaker unit includes an L-pole electrical circuit, wherein the N-pole electrical circuit in the N-pole module assembly is configured such that the Lorentz force generated by the magnetic field of the current in the N-pole electrical circuit on the arc in the circuit breaker unit can assist the arc to be further pushed and elongated.

[0017] In one embodiment, the N-pole circuit is positioned above the arcing area of ​​the circuit breaker unit in the height direction of the circuit breaker.

[0018] In one embodiment, the L-pole electrical circuit of the circuit breaker unit includes a moving contact, a stationary contact, a moving arc-starting plate, and a stationary arc-starting plate. The moving contact and the stationary contact are arranged opposite each other to form a contact assembly of the L-pole electrical circuit. Both the moving arc-starting plate and the stationary arc-starting plate extend downward and then laterally from the position of the contact assembly to form an arc-running area between the moving arc-starting plate and the stationary arc-starting plate. The first N-pole conductive plate is disposed above the contact assembly and the arc-running area.

[0019] The present invention has the following beneficial effects: 1. This invention divides the long N-pole conductor within the N-pole module assembly into two parts: a first N-pole conductive plate and a second N-pole conductive plate. The first N-pole conductive plate is fixedly integrated onto the main functional module, forming an independent modular structure. The second N-pole conductive plate is fixedly integrated onto the current detection module, forming another independent modular structure. During manufacturing, these two modular structures can be manufactured separately first, and then assembled together to produce the N-pole module assembly. Because rigid first and second N-pole conductive plates replace the flexible wires in the prior art, the installation of the first N-pole conductive plate on the main functional module and the installation of the second N-pole conductive plate on the current detection module are more convenient and faster, and easier to achieve through automation. More importantly, when assembling the N-pole module assembly in this embodiment, it is only necessary to fix the first and second N-pole conductive plates together, thus eliminating the complex bending and wiring process of flexible wires inside the N-pole module assembly in the prior art. The assembly is convenient and can be automated with the help of automated mechanisms. In addition, the rigid first and second N-pole conductive plates offer greater material selection. For example, iron can be selected for small load current specifications, and copper can be selected for large load current specifications, making the material cost of the parts more economical.

[0020] 2. This invention, through a special arrangement of the N-pole and L-pole circuits in their relative positions, enables the Lorentz force generated by the magnetic field of the current in the N-pole circuit on the arc in the circuit breaker unit to further push and elongate the arc. This enhances the magnetic blowout arc extinguishing function, accelerates the transfer of the arc to the arc extinguishing chamber, reduces contact erosion and loss, and improves short-circuit capability, electrical life performance, and reliability. For small-load products, under the action of the N-pole magnetic field, components such as the magnetizing plate and gas-generating plate in the arc-running area can be eliminated, while still meeting the requirements for short-circuit capability and electrical life performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram (one of the) of the N-pole conductor of the N-pole unit of a prior art circuit breaker. Figure 2 This is a schematic diagram (Part Two) of the N-pole conductor of the N-pole unit of a prior art circuit breaker. Figure 3 This is a schematic diagram of the circuit breaker in Embodiment 1; Figure 4 This is a schematic diagram of the internal structure of the N-pole module component in Example 1; Figure 5 This is an exploded view of the N-pole module assembly in Example 1; Figure 6 This is a schematic diagram of the first N-pole conductive plate mounted on the base in Embodiment 1; Figure 7 This is a schematic diagram of the main functional modules in Embodiment 1; Figure 8 This is a cross-sectional view of the N-pole module assembly in Embodiment 1; Figure 9 This is a schematic diagram of the installation of the first N-pole conductive plate, the second N-pole conductive plate, and the current transformer in Embodiment 1; Figure 10 This is a schematic diagram of the first N-pole conductive plate in Example 1; Figure 11 This is a schematic diagram of the second N-pole conductive plate in Example 1; Figure 12 This is a schematic diagram of the current detection module in Example 1; Figure 13 This is a schematic diagram of the insulating cover plate in Example 1; Figure 14 This is a schematic diagram of the insulating cover plate covering and fixing the first N-pole conductive plate in Embodiment 1; Figure 15 This is a schematic diagram of the L-pole and N-pole electrical circuits of the circuit breaker in Example 2. Detailed Implementation

[0022] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1: See Figures 2-9As shown, in a preferred embodiment of the present invention, a circuit breaker is provided, specifically a residual current operated circuit breaker with overcurrent protection function, including a circuit breaker unit 10 and an N-pole module assembly 20. The circuit breaker unit 10 is provided with an L-pole electrical circuit, which can realize the opening and closing of the circuit. The N-pole module assembly 20 detects the leakage current in the circuit and performs a tripping action. The N-pole module assembly 20 further includes a current detection module 5 and a main functional module 25. The main functional module 25 further includes a base 1 and a top cover 2. The base 1 and the top cover 2 are spliced ​​to form the outer shell 200 of the main functional module 25, and an electronic component board (or PCB board) mounting cavity 100 is formed inside the outer shell 200. Other structures such as leakage test circuit and tripping device may also be provided inside the outer shell 200. The N-pole module assembly 20 also includes a first N-pole conductive plate 3 and a second N-pole conductive plate 4. Both the first N-pole conductive plate 3 and the second N-pole conductive plate 4 are rigid conductive materials. The main body of the first N-pole conductive plate 3 is fixed inside the housing 200, and the first terminal 61 is fixedly installed at one end of the housing 200. The first end 31 of the first N-pole conductive plate protrudes outside the housing 200 (e.g., ...). Figure 7 The second end 32 of the first N-pole conductive plate and the first terminal 61 are fixedly electrically connected. The current detection module 5 includes a fixedly mounted current transformer 50 and a second terminal 62. The second N-pole conductive plate 4 is installed inside the current detection module 5 by passing through the current transformer 50. The first end 41 of the second N-pole conductive plate and the second terminal 62 are fixedly electrically connected. The second end 42 of the second N-pole conductive plate protrudes outside the current detection module 5 (e.g., ...). Figure 5 Before installation, the current detection module 5 and the main functional module 25 are two independent modules. The first N-pole conductive plate 3 is fixedly integrated into the main functional module 25, and the second N-pole conductive plate 4 is fixedly integrated into the current detection module 5. The first end 31 of the first N-pole conductive plate and the second end 42 of the second N-pole conductive plate each serve as external connection terminals for two electrical circuits. During installation, the first end 31 of the first N-pole conductive plate and the second end 42 of the second N-pole conductive plate are fixedly electrically connected, so that the first N-pole conductive plate 3 and the second N-pole conductive plate 4 form the N-pole electrical circuit of the N-pole module assembly 20. One end of this N-pole electrical circuit is connected to the first terminal 61, and the other end is connected to the second terminal 62. The first terminal 61 and the second terminal 62 serve as a power supply side connection port and the other as a load side connection port, realizing the complete electrical connection function of the N-pole electrical circuit. The current detection module 5 and the main functional module 25 are also connected as one unit through the fixed connection of the first end 31 of the first N-pole conductive plate and the second end 42 of the second N-pole conductive plate.

[0025] In this embodiment, the N-pole long conductor within the N-pole module assembly 20 is divided into two parts: a first N-pole conductive plate 3 and a second N-pole conductive plate 4. The first N-pole conductive plate 3 is fixedly integrated onto the main functional module 25, and the main functional module 25 with the first N-pole conductive plate 3 forms an independent modular structure (e.g., ...). Figure 7 As shown), the second N-pole conductive plate 4 is fixedly integrated onto the current detection module 5, and the current detection module 5 with the second N-pole conductive plate 4 forms another independent modular structure (as shown). Figure 5 As shown in the diagram, during manufacturing, these two modular structures can be manufactured separately first, and then assembled together to produce the N-pole module assembly 20. Because rigid first N-pole conductive plate 3 and second N-pole conductive plate 4 replace the flexible wires in the prior art, the installation of the first N-pole conductive plate 3 on the main functional module 25 and the installation of the second N-pole conductive plate 4 on the current detection module 5 are more convenient and faster, and easier to automate. More importantly, in this embodiment, the N-pole module assembly 20 only requires the first N-pole conductive plate 3 and the second N-pole conductive plate 4 to be fixedly connected during assembly, thus eliminating the complex bending and wiring process of flexible wires inside the N-pole module assembly in the prior art. Assembly is convenient and can be automated using automated mechanisms. Furthermore, the rigid first N-pole conductive plate 3 and second N-pole conductive plate 4 offer greater material selection; for example, iron can be selected for small load current specifications, and copper for large load current specifications, making the material cost of the parts more economical.

[0026] In this embodiment, the first end 31 of the first N-pole conductive plate and the second end 42 of the second N-pole conductive plate are fixed by screw 8 threaded connection. Of course, welding, riveting and other means can also be used in other embodiments, but the threaded connection makes it easier to achieve automated production of N-pole module assembly 20.

[0027] In this embodiment, the current detection module 5 uses a current transformer for current detection, but in other embodiments, current detection devices based on other principles, such as Rogowski coils, Hall sensors, and magnetoresistive sensors, can also be used.

[0028] In this embodiment, the end of the first terminal 61 located on the outer casing 200 and the end of the first end 31 of the first N-polar conductive plate exposed on the outer casing 200 are opposite ends on the outer casing 200. That is, the first N-polar conductive plate 3 extends through the opposite ends on the outer casing 200. This allows for a shorter loop length for the first N-polar conductive plate 3, thereby reducing energy consumption. Of course, the specific positions of the two ends of the first N-polar conductive plate 3 and its extension path depend on the positions of the current detection module 5 and the first terminal 61 relative to the outer casing 200. If the positions of the current detection module 5 and the first terminal 61 relative to the outer casing 200 change in other embodiments, the specific positions of the two ends of the first N-polar conductive plate 3 and its extension path can also be adapted accordingly.

[0029] like Figure 8 As shown, in the circuit breaker height direction (T-direction) as indicated, the N-pole circuit composed of the first N-pole conductive plate 3 and the second N-pole conductive plate 4 has an upwardly shaped inverted "U"-shaped bend 30. This provides more space for the mounting cavity 100 of the electronic component board, facilitating the functional expansion of the electronic component board. Simultaneously, it allows the housing 200 to have a sufficiently large opening / through space for the electronic component board's wiring, avoiding the reliability issues caused by congested wiring. Furthermore, the simple bending structure of this bend 30 results in high material utilization, space saving, and easy assembly positioning, which is beneficial for automated assembly.

[0030] Figure 10 and Figure 11The structures of the first N-polar conductive plate 3 and the second N-polar conductive plate 4 are shown respectively. In this embodiment, both the first N-polar conductive plate 3 and the second N-polar conductive plate 4 are integral stamped parts, and both are thin sheet structures. Compared with soft wires, the length of the N-polar electrical circuit formed by the first N-polar conductive plate 3 and the second N-polar conductive plate 4 is shorter. When designing the position of the first N-polar conductive plate 3 and the second N-polar conductive plate 4, they can be closer to the electronic component board, resulting in reduced energy consumption, reduced carbon emissions, and greater environmental friendliness. Positioning / limiting structures can be provided on the outer casing 200 and the current detection module 5 to cooperate with the first N-polar conductive plate 3 and the second N-polar conductive plate 4 respectively, improving the positional reliability of the first N-polar conductive plate 3 and the second N-polar conductive plate 4. For example, a slot 9 is provided on the base 1 to limit the first N-polar conductive plate 3 in the thickness direction. The second N-polar conductive plate 4 is provided with a plug-in part 43 for plugging and limiting the cover of the current detection module 5. A T-shaped limiting head 33 is provided at the end of the first N-pole conductive plate 3. Correspondingly, a limiting groove is provided on the outer casing 200 to cooperate with the limiting head 33. The T-shaped limiting head 33 hooks onto the edge of the limiting groove to achieve anti-detachment limiting of the first N-pole conductive plate 3. The second N-pole conductive plate 4 is provided with a T-shaped limiting head 44 with the same principle as the limiting head 33. Figure 14 As shown, the second end 32 of the first N-pole conductive plate has an uneven, rough surface 34, which helps to improve the reliability of the electrical connection between the second end 32 of the first N-pole conductive plate and the external wire. Similarly, the first end 41 of the second N-pole conductive plate can also be provided with the same uneven, rough surface to improve the reliability of the electrical connection with the external wire.

[0031] like Figure 9 , 11 As shown in Figure 12, the second N-pole conductive plate 4 is inserted into the current transformer 50 by a U-shaped bend 45. The current detection module 5 also includes an L-pole conductive plate 300 that passes through the current transformer 50. By using this U-shaped bend 45 to pass through the current transformer 50, the second N-pole conductive plate 4 can be placed closer to the radial outer side of the current transformer 50. That is, the second N-pole conductive plate 4 is offset towards the radial outer side of the current transformer 50, which increases the electrical clearance between the second N-pole conductive plate 4 and the L-pole conductive plate 300, meeting the minimum electrical requirements of the standard, thus eliminating the need for additional insulation components.

[0032] like Figure 5 , 13As shown in Figures 1 and 14, the N-pole module assembly 20 also includes an insulating cover plate 7, which covers and is fixed on the first N-pole conductive plate 3 to achieve dielectric isolation between the first N-pole conductive plate 3 and the electronic component board. In this embodiment, the insulating cover plate 7 has a slot 71, the shape of which basically matches the shape of the bent section 30 of the first N-pole conductive plate 3 (the bent section 30 is closest to the electronic component board), and the slot 71 is snapped and nested on the bent section 30.

[0033] Although this embodiment is described using a two-pole residual current operated circuit breaker, it is obvious that any multi-pole circuit breaker with an N-pole module component can adopt the structure of the N-pole module component 20 of this embodiment and have the same technical effects and functions.

[0034] Example 2: This embodiment provides a circuit breaker having a circuit breaker unit and an N-pole module assembly with the same layout as in Embodiment 1. Figure 15 The diagram shows the L-pole circuit 400 and N-pole circuit 500 in the circuit breaker of this embodiment. The L-pole circuit 400 and N-pole circuit 500 are connected in series. The N-pole circuit 500 in this embodiment is the same as the N-pole circuit in the N-pole module assembly 20 of Embodiment 1, including a first N-pole conductive plate 3. It is worth noting the relative positions of the L-pole circuit 400 and N-pole circuit 500. Specifically, the L-pole circuit 400 includes a moving contact 401, a stationary contact 402, a moving arc-starting plate 403, and a stationary arc-starting plate 404. The first N-pole conductive plate 3 is positioned above the moving contact 401 and the stationary contact 402 in the L-pole circuit 400 (above is in the height direction of the circuit breaker, i.e., above). Figure 6 (In the T direction), the moving contact 401 and the stationary contact 402 are arranged opposite each other to form a contact assembly of the L-polar electrical circuit 400. The moving arc-inducing plate 403 and the stationary arc-inducing plate 404 both extend downward and then laterally from the position of the contact assembly to form an arc-running area 700 of the arc 600 between the moving arc-inducing plate 403 and the stationary arc-inducing plate 404. The arc-running area 700 also extends downward and then laterally from the position of the contact assembly. Figure 15The solid arrows indicate the current directions of the L-pole circuit 400 and the N-pole circuit 500, while the dashed arrows indicate the direction of the Lorentz force F acting on the arc 600. It can be seen that, since the first N-pole conductive plate 3 is positioned above the contact assembly and the arc-running area 700, the magnetic field M generated by the current on the first N-pole conductive plate 3 can assist in further elongating the arc 600 between the moving arc-starting plate 403 and the stationary arc-starting plate 404. This can enhance the magnetic blowout arc-extinguishing function, accelerate the transfer of the arc to the arc-extinguishing chamber, reduce the erosion loss of the contacts, and improve short-circuit capability, electrical life performance, and reliability. For small-load products, under the action of the N-pole magnetic field, the magnetizing plate, gas-generating plate, and other parts in the arc-running area 700 can be eliminated, while still meeting the requirements for short-circuit capability and electrical life performance.

[0035] The magnetic blowout arc extinguishing effect of the first N-pole conductive plate 3 mentioned above is generated by the relative arrangement of the N-pole circuit 500 and the L-pole circuit 400. It can be seen that if the existing technology is used ( Figure 1 and Figure 2 As shown, the arrangement of the N-pole conductor in the arc-running region 700 results in a magnetic field direction opposite to that generated by the first N-pole conductive plate 3 in the arc-running region 700, thus slowing down the arc-extinguishing process of the arc 600. In this embodiment, the N-pole circuit 500 spans above the arc-running region 700, thus achieving a more effective magnetic blowout arc extinguishing function. The N-pole circuit 500 does not need to be strictly positioned above both the contact assembly and the arc-running region 700; as long as it is generally located above the arc-running region 700, it can achieve a good magnetic blowout arc extinguishing effect. However, having the N-pole circuit 500 both above the contact assembly and the arc-running region 700 allows it to achieve a magnetic blowout arc extinguishing effect throughout the entire arc-running process. The descriptions of directions such as up, down, left, right, and lateral in this example are only for the purpose of more clearly illustrating this embodiment. The orientation of the product in actual application is not fixed. As long as the current flow direction and relative arrangement of the L-pole circuit 400 and N-pole circuit 500 are similar, it is feasible if the Lorentz force generated by the magnetic field of the current on the N-pole circuit 500 on the arc in the circuit breaker unit can help to further push and lengthen the arc.

[0036] In this embodiment, the N-pole circuit 500 is also composed of a rigid conductive plate. However, it is clear that the material of the N-pole circuit 500 does not limit the realization of the magnetic blow function of the N-pole circuit 500. For example, enameled circular winding assembly or enameled copper flat winding assembly with multiple segments of hard wire welded together are also feasible.

[0037] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. An N-pole module assembly for a circuit breaker, characterized in that: The device includes a main functional module and a current detection module, as well as a first N-pole conductive plate fixedly integrated in the main functional module and a second N-pole conductive plate fixedly integrated in the current detection module. Both the first N-pole conductive plate and the second N-pole conductive plate are rigid conductive materials. The main functional module with the first N-pole conductive plate and the current detection module with the second N-pole conductive plate are two independent modular structures. The first N-pole conductive plate and the second N-pole conductive plate are fixedly connected to form an N-pole electrical circuit, and the current detection module is fixedly connected to the main functional module as one unit through the fixed connection of the first N-pole conductive plate and the second N-pole conductive plate.

2. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: It also includes a first terminal block and a second terminal block. The main functional module includes a housing. The main body of the first N-pole conductive plate is fixed inside the housing. The first terminal block is fixedly installed at one end of the housing. The first end of the first N-pole conductive plate protrudes outside the housing. The second end of the first N-pole conductive plate and the first terminal block are fixedly electrically connected. The second terminal block is fixedly disposed in the current detection module. The first end of the second N-pole conductive plate and the second terminal block are fixedly electrically connected. The second end of the second N-pole conductive plate protrudes outside the current detection module. The first end of the first N-pole conductive plate and the second end of the second N-pole conductive plate are fixedly electrically connected.

3. The N-pole module assembly of the circuit breaker according to claim 2, characterized in that: The first terminal is located at one end of the housing and the first end of the first N-pole conductive plate is exposed at one end of the housing. These are two opposite ends on the housing. The first N-pole conductive plate extends between the two opposite ends on the housing.

4. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: The main functional module includes an outer shell, inside which an electronic component board mounting cavity is formed. In the height direction of the circuit breaker, the N-pole electrical circuit composed of the first N-pole conductive plate and the second N-pole conductive plate has an upwardly inverted "U"-shaped bend to make way for the mounting cavity.

5. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: It also includes an insulating cover plate, which covers and is fixed to the first N-pole conductive plate.

6. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: The current detection module includes a current transformer, a second N-pole conductive plate passing through the current transformer, and the part of the second N-pole conductive plate that passes through the current transformer is a U-shaped bend. The second N-pole conductive plate is offset radially outward from the current transformer.

7. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: Both the first N-pole conductive plate and the second N-pole conductive plate are integral stamped parts.

8. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: The end of the first N-pole conductive plate that is in electrical contact with the first terminal has an uneven, rough surface, and / or the end of the second N-pole conductive plate that is in electrical contact with the second terminal has an uneven, rough surface.

9. The N-pole module assembly of the circuit breaker according to claim 1, characterized in that: A T-shaped limiting head is provided at the end of the first N-pole conductive plate for hooking and engaging with the main functional module to achieve anti-detachment limiting, and / or a T-shaped limiting head is provided at the end of the second N-pole conductive plate for hooking and engaging with the current detection module to achieve anti-detachment limiting.

10. A circuit breaker, comprising a circuit breaker unit and an N-pole module assembly, characterized in that: The N-pole module assembly is the N-pole module assembly of the circuit breaker according to any one of claims 1-9.

11. The circuit breaker according to claim 10, characterized in that: The N-pole circuit in the N-pole module assembly is configured such that the magnetic field generated by the current in the N-pole circuit can assist in further elongating the arc in the circuit breaker unit by generating a Lorentz force on the arc.

12. The circuit breaker according to claim 11, characterized in that: In the height direction of the circuit breaker, the N-pole circuit is positioned above the arcing area of ​​the circuit breaker unit.

13. The circuit breaker according to claim 12, characterized in that: The L-pole electrical circuit of the circuit breaker unit includes a moving contact, a stationary contact, a moving arc-starting plate, and a stationary arc-starting plate. The moving contact and the stationary contact are arranged opposite each other to form the contact assembly of the L-pole electrical circuit. Both the moving arc-starting plate and the stationary arc-starting plate extend downward and then laterally from the position of the contact assembly to form an arc-running area between the moving arc-starting plate and the stationary arc-starting plate. The first N-pole conductive plate is positioned above the contact assembly and the arc-running area.

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