Leakage protection module

Abstract

The application discloses a leakage protection module, which comprises a second shell, a leakage detection circuit and a leakage tripping mechanism driven by the leakage detection circuit are arranged in the second shell, the leakage detection circuit comprises two wiring terminals and a zero sequence transformer, the leakage detection circuit further comprises at least one wiring lug, one end of the at least one wiring lug is connected with the wiring terminal, the other end of the at least one wiring lug passes through a threading hole of the zero sequence transformer to form a plug-in lug, and the plug-in lug is arranged opposite to a second wiring port of a side wall of the second shell. The leakage protection module is modularized, the wiring lug connected with the wiring terminal forms the plug-in lug, the leakage protection module can be connected with a circuit breaker pole in a plug-in mode, and power is taken from a main circuit of the circuit breaker pole, so that the leakage protection module is connected with the circuit breaker pole through a wire in the prior art is replaced, the automatic assembly of the leakage protection module and the circuit breaker pole is facilitated, and the modular development of the circuit breaker is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-voltage electrical apparatus, in particular to a leakage protection module. BACKGROUND

[0002] Low-voltage circuit breakers can be used to distribute electric energy and protect lines and power supply equipment from overload and short circuit, and can also be used for infrequent switching of lines and infrequent starting of motors. With the continuous development of Internet of Things technology and artificial intelligence technology, small size and modularity have become the trend of low-voltage circuit breakers.

[0003] The existing low-voltage circuit breakers usually have a leakage protection function, but the circuit breakers with the leakage protection function usually adopt an integrated structure, that is, the circuit breaker poles and the leakage protection module are integrated in the same installation cavity of the shell. This structure cannot meet the modular development trend of existing circuit breakers, and the wiring process of the leakage protection module and the circuit breaker poles is relatively complicated, which is not conducive to automated production. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a leakage protection module which is convenient to wire and meets the modular development trend.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] A leakage protection module comprises a second shell, a leakage detection circuit and a leakage tripping mechanism driven by the leakage detection circuit are assembled in the second shell, the leakage detection circuit comprises two wiring terminals and a zero sequence transformer, the leakage detection circuit further comprises at least one wiring sheet, one end of the at least one wiring sheet is connected with the wiring terminal, and the other end of the at least one wiring sheet passes through a threading hole of the zero sequence transformer to form a terminal block, and the terminal block is arranged opposite to a second wiring port of a side wall of the second shell.

[0007] Further, the second wiring port is arranged opposite to the threading hole of the zero sequence transformer on the side wall of the second shell.

[0008] Further, the leakage detection circuit comprises two wiring sheets, one end of each of the two wiring sheets is connected with the two wiring terminals respectively, and the other end of each of the two wiring sheets passes through the threading hole of the zero sequence transformer to form two terminal blocks arranged side by side.

[0009] Further, the zero sequence transformer is provided with an electrical isolation plate in the threading hole, the electrical isolation plate divides the threading hole into a first threading hole and a second threading hole, and the two wiring sheets pass through the first threading hole and the second threading hole respectively.

[0010] Further, the two wiring terminals are respectively an L-pole outgoing terminal and an N-pole outgoing terminal,

[0011] The lug connected to the L-phase outgoing terminal is a first lug, the first lug is located at one side of the zero sequence transformer and does not pass through the threading hole of the zero sequence transformer, or the first lug passes through the threading hole of the zero sequence transformer,

[0012] The lug connected to the N-phase outgoing terminal is a second lug, and the second lug passes through the threading hole of the zero sequence transformer.

[0013] Further, the first lug passes through the threading hole of the zero sequence transformer, the first lug comprises a first conductive plate, a second conductive plate and an extension plate,

[0014] One end of the first conductive plate is connected to the L-phase outgoing terminal as a first end of the first lug, and the other end of the first conductive plate is bent to a side away from the L-phase outgoing terminal,

[0015] One end of the extension plate is connected to the other end of the first conductive plate, and the other end of the extension plate is bent away from the first conductive plate,

[0016] The second conductive plate is a second end of the first lug, one end of the second conductive plate is connected to the side of the extension plate away from the first conductive plate, and the other end of the second conductive plate passes through the threading hole of the zero sequence transformer.

[0017] Further, a first abutting groove is formed in the side of the extension plate, and a leakage test circuit is further assembled in the second housing,

[0018] The leakage test circuit comprises a test button, a first elastic member and a second elastic member, and the first elastic member and the second elastic member cooperate to form a breakpoint of the leakage test circuit;

[0019] The leakage detection circuit comprises a circuit board connected to the zero sequence transformer;

[0020] One end of the second elastic member is in elastic abutment with the first abutting groove, and the other end of the second elastic member is connected to the circuit board.

[0021] Further, the first lug does not pass through the threading hole of the zero sequence transformer, the first lug comprises a first conductive plate and a second conductive plate,

[0022] One end of the first conductive plate is connected to the L-phase outgoing terminal as a first end of the first lug, and the other end of the first conductive plate is bent to a side away from the L-phase outgoing terminal,

[0023] The second conductive plate is a second end of the first lug, one end of the second conductive plate is connected to the other end of the first conductive plate, and the second conductive plate extends away from the first conductive plate and approaches the threading hole of the zero sequence transformer.

[0024] Further, a first abutting groove is formed on the other end side of the second conductive plate, and the first abutting groove corresponds to the threading hole of the zero sequence transformer.

[0025] Further, the second terminal lug is in a plate structure as a whole, and the second terminal lug is electrically connected to the N-pole terminal, and a second end of the second terminal lug forms a terminal lug by penetrating the threading hole of the zero sequence transformer.

[0026] Further, a second abutting groove is formed on the first end side of the second terminal lug,

[0027] The leakage detection circuit comprises a third elastic member and a circuit board connected to the zero sequence transformer.

[0028] One end of the third elastic member is in elastic abutment with the second abutting groove, and the other end is connected to the circuit board.

[0029] The leakage protection module of the present application adopts a modularized leakage protection module, and the terminal lug connected to the terminal forms a terminal lug, so that the leakage protection module can be connected to the circuit breaker pole in a plug-in manner, and electricity is taken from the main circuit of the circuit breaker pole, so as to replace the prior art of connecting the leakage protection module to the circuit breaker pole by wires, which is conducive to realizing the automatic assembly of the leakage protection module and the circuit breaker pole, and conforms to the modular development of the circuit breaker.

[0030] In addition, the terminal lug corresponds to the threading hole of the zero sequence transformer, so that the length of the terminal lug is shortened, which is convenient for wiring and conducive to reducing the volume.

[0031] In addition, the threading hole of the zero sequence transformer is provided with an electrical isolation plate, which is conducive to electrically isolating the first terminal lug and the second terminal lug.

[0032] In addition, the first terminal lug can or can not penetrate the threading hole of the zero sequence transformer, which can meet different use requirements. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a top view of the circuit breaker pole in the present application;

[0034] Figure 2 is a structural schematic view of the first shell in the present application;

[0035] Figure 3 is a structural schematic view of the leakage protection module in the present application;

[0036] Figure 4 is a structural schematic view of the second shell in the present application;

[0037] Figure 5 is a structural schematic view of the leakage protection module in the present application;

[0038] Figure 6This is a schematic diagram of the zero-sequence current transformer and the first and second connecting pieces in this invention (first structure);

[0039] Figure 7 This is a schematic diagram of the internal structure of the leakage protection module in this invention (the first terminal of the coil serves as the lead-out conductive element);

[0040] Figure 8 This is a schematic diagram of the zero-sequence current transformer and the first and second connecting pieces in this invention (second structure);

[0041] Figure 9 This is a schematic diagram of the coil structure in this invention (the first terminal of the coil serves as the lead-out conductive element). Detailed Implementation

[0042] The following is in conjunction with the appendix Figures 1-9 The given embodiments further illustrate specific implementations of the leakage current protection module of the present invention. The leakage current protection module of the present invention is not limited to the descriptions in the following embodiments.

[0043] A leakage current protection module includes a second housing 12, in which a leakage current detection circuit and a leakage current tripping mechanism driven by the leakage current detection circuit are assembled. The leakage current detection circuit includes two terminals and a zero-sequence current transformer 34. The leakage current detection circuit also includes at least one connecting piece, one end of which is connected to the terminals, and the other end passes through the wire hole of the zero-sequence current transformer 34 to form a connector 44. The connector 44 is disposed opposite to the second wiring port 121 on the side wall of the second housing 12.

[0044] The leakage current protection module 3 of the present invention adopts a modular leakage current protection module 3, and the connecting piece on the terminal block forms a plug 44, so that the leakage current protection module 3 can be connected to the circuit breaker pole 2 by plugging and draw power from the main circuit of the circuit breaker pole 2, which replaces the existing technology of connecting the leakage current protection module 3 and the circuit breaker pole 2 by wire. This is conducive to realizing the automated assembly of the leakage current protection module 3 and the circuit breaker pole 2, which is in line with the modular development of circuit breakers.

[0045] like Figures 1-9As shown, the circuit breaker comprises a housing, at least one circuit breaker pole 2 is arranged in the housing, the housing comprises at least one mounting cavity for assembling the circuit breaker pole 2, when a plurality of mounting cavities are arranged in the housing, the housing can comprise a plurality of partitions fixedly arranged in the housing, the mounting cavities are formed by the intervals between two adjacent partitions, or the housing comprises a cover, a base and partitions assembled between the cover and the base, wherein one mounting cavity is formed by the cover and one partition, the base and another partition form another mounting cavity, and the remaining partitions form a plurality of independent mounting cavities respectively, and the independent mounting cavities can be used as the first shell 11, two adjacent first shells 11 can be assembled together, and thus the housing of the circuit breaker comprises a plurality of assembled first shells 11.

[0046] A phase main circuit is arranged in each circuit breaker pole 2, that is, N-phase main circuits or one-phase L-phase main circuits are arranged in each circuit breaker pole 2, for example, four circuit breaker poles are arranged in the circuit breaker, three of which are L poles and each is provided with one-phase L-phase main circuit and operating mechanism, and one circuit breaker pole is provided with N-phase main circuit and operating mechanism, or two circuit breaker poles are arranged in the circuit breaker, both of which are L poles or L pole and N pole respectively. Of course, two-phase main circuits can also be arranged in the same circuit breaker pole 2, for example, L-phase main circuit and N-phase main circuit are arranged in one circuit breaker pole, or two-phase L-phase main circuits are arranged in one circuit breaker pole, and preferably only one operating mechanism is arranged in the same circuit breaker pole.

[0047] The embodiment takes two circuit breaker poles 2 as an example, and only one-phase main circuit is arranged in each circuit breaker pole 2, that is, one of the circuit breaker poles 2 is provided with L-phase main circuit as L pole, and the other circuit breaker pole 2 is provided with N-phase main circuit as N pole, and the L-phase main circuit and the N-phase main circuit jointly form the main circuit of the circuit breaker, and the L pole and the N pole are jointly assembled in the same mounting cavity, that is, the L pole, the N pole are jointly arranged in the same first shell 11.

[0048] Each circuit breaker pole 2 comprises a pair of connection terminals connected to a phase main circuit, and a handle mechanism, an operating mechanism and a contact mechanism connected in sequence, the pair of connection terminals comprises an incoming terminal and an outgoing terminal, the contact mechanism is connected between the pair of connection terminals for controlling the on-off of the phase main circuit, the contact mechanism comprises a movable contact and a stationary contact matched with each other, the movable contact is connected with the operating mechanism in linkage, the stationary contact is fixedly assembled on the side opposite to the movable contact, the handle mechanism is manually operated to drive the operating mechanism, so that the movable contact and the stationary contact are contacted or separated to realize the on-off control of the main circuit in the circuit breaker pole 2. In addition, each circuit breaker pole 2 can be provided with an arc extinguishing system, and a short-circuit protection mechanism and / or an overload protection mechanism matched with the operating mechanism, the arc extinguishing system is arranged on one side of the contact mechanism for extinguishing the arc generated by the movable contact and the stationary contact during the opening and closing process, and the operating mechanism is triggered to trip when a short-circuit or overload fault occurs in the main circuit.

[0049] As shown in Figures 1-2 The connection terminals of the circuit breaker pole 2 are arranged at least at one end of the shell, the incoming terminals (or outgoing terminals) of the adjacent two circuit breaker poles 2 are located at the same end of the shell, the handle mechanism is rotatably assembled at the upper part of the shell (the first shell body 11), the operating mechanism is arranged at one side of the handle mechanism, the handle mechanism and the operating mechanism are connected in linkage through a connecting rod, the movable contact is connected to the lower part of the operating mechanism, the operating mechanisms and the handle mechanisms of the adjacent two circuit breaker poles 2 are connected in linkage respectively, the arc extinguishing chamber of the arc extinguishing system and the stationary contact are fixed to the middle part of the shell (the first shell body 11), wherein the stationary contact is opposite to the movable contact.

[0050] The operating mechanism of each circuit breaker pole 2 comprises a lever rotatably assembled in the shell, the lever can be rotatably connected with the side wall of the shell or the partition plate in the shell or the side wall of the first shell body 11, a trip and a lock are rotatably assembled on the lever, the movable contact is rotatably installed through a contact support and is linked with the lever, the trip is matched with the lock in buckle, one end of the trip is linked with the connecting rod, the lock is provided with a linkage part in the form of a rod, an avoiding hole is arranged on the side wall of the shell or the partition plate in the shell or the side wall of the first shell body 11 corresponding to the linkage part, one end of the linkage part can pass through the avoiding hole and protrude out; an energy storage spring is assembled between the lever and the contact support, two elastic arms of the energy storage spring are respectively abutted with the contact support and the lever, and the energy storage spring is preferably a torsional spring rotatably assembled coaxially with the contact support.

[0051] The short-circuit protection mechanism and overload protection mechanism are arranged in the L pole, wherein the short-circuit protection mechanism is arranged between the handle mechanism and the arc extinguishing chamber of the arc extinguishing system, one end of the short-circuit protection mechanism is opposite to the operating mechanism of the L pole, the overload protection mechanisms are respectively arranged on the two sides of the operating mechanism of the L pole, one end of the overload protection mechanism is matched with the operating mechanism, and the short-circuit protection mechanism and the arc extinguishing system are not arranged in the N pole, and the overload protection mechanism is not arranged in the N pole. Of course, the short-circuit protection mechanism, the arc extinguishing system and the overload protection mechanism 26 can also be arranged in the N pole, that is, the structure similar to the L pole is used as the N pole. In addition, the operating mechanisms 22 of the adjacent circuit breaker poles 2 can share some parts, such as levers, contact supports, jumpers and the like, and the handle mechanism 21 and the lock linkage are matched.

[0052] An accessory module is further arranged on one side of one of the circuit breaker poles 2, that is, the accessory module is arranged on one side of the first shell, and the accessory module in the embodiment takes the leakage protection module 3 as an example, as shown in Figures 3-9 The leakage protection module 3 preferably comprises a second shell 12, the second shell 12 is spliced with one first shell 11 to form a circuit breaker with a leakage protection function, at this time, the shell comprises one second shell 12 and at least one first shell 11, the leakage detection circuit and the leakage release mechanism are arranged in the second shell 12, wherein the leakage release mechanism comprises a release 37 driven by the leakage detection circuit, the leakage detection circuit comprises a line board 35 and a zero sequence transformer 34 connected with the line board 35, a controller for driving the leakage release mechanism is arranged on the line board 35, the zero sequence transformer 34 is connected with the L phase main line and the N phase main line for detecting a leakage signal, the release 37 can be driven to actuate the top rod when the leakage detection circuit detects a leakage fault, after the top rod completes the action, a push plate 39 and an indicating piece 38 are correspondingly arranged on one side of the top rod of the release 37, an avoiding hole is arranged on the side wall of the second shell 12 corresponding to the push plate 39, and the linkage part of the adjacent circuit breaker pole 2 passes through the avoiding hole and is matched with the push plate 39, when a leakage fault occurs, the release 37 triggers the push plate 39 to rotate, the linkage part drives the lock to rotate, thereby releasing the operating mechanism, and the indicating piece 38 acts to indicate the leakage, and the leakage release mechanism in the embodiment can adopt the prior art.

[0053] The leakage protection module 3 further comprises a leakage test mechanism, the leakage test mechanism comprises a leakage test circuit taking power from the main circuit, the leakage test circuit comprises a test button 36, a first elastic piece 31 and a second elastic piece 32, the test button 36 is slidingly arranged in the second shell 12, the first elastic piece 31 and the second elastic piece 32 are matched to form the breakpoint of the leakage test circuit, and the first elastic piece 31 is elastically deformed to connect the breakpoint of the leakage test circuit by pressing the test button 36, preferably, the leakage test circuit further has a leakage test winding of the zero sequence transformer 34 in series, and the leakage current detection winding of the zero sequence transformer 34 is connected with the line board 35.

[0054] An improvement of the present application is that the accessory module and the circuit breaker pole 2 are modular structures, and the assembly of the accessory module and the circuit breaker pole 2 also adopts two module structures to be assembled together, that is, the leakage protection module 3 of the embodiment adopts a modular structure, and the assembly of the second shell 12 of the leakage protection module 3 and the first shell 11 of the circuit breaker pole 2 forms the shell of the circuit breaker by assembling the first shell 11 and the second shell 12, and meanwhile, the assembly of the leakage protection module 3 on one side of the circuit breaker pole 2 can simultaneously realize the power taking from the main circuit of the circuit breaker pole 2, and preferably, the leakage protection module 3 is connected into the main circuit of the circuit breaker in a plug-in connection manner, that is, the leakage protection module 3 is connected into the L-phase main circuit and the N-phase main circuit of the circuit breaker pole 2 in a plug-in connection manner. It should be noted that as other embodiments, the power taking of the leakage protection module 3 and the L-phase main circuit and the N-phase main circuit of the circuit breaker pole 2 can also be contact power taking, but the contact power taking is not as stable as the plug-in connection.

[0055] Specifically, the side wall adjacent to the first shell 11 and the second shell 12 is provided with a wiring port, at least one lead-out conductive member 45 is connected on the L-phase main circuit or the N-phase main circuit of the circuit breaker pole, and a wiring piece is connected on the wiring terminal of the leakage protection module 3, the lead-out conductive member 45 and / or the wiring piece form a plug-in connection structure for accessing the main circuit through the wiring port, and the lead-out conductive member 45 and / or the wiring piece of the plug-in connection structure pass through the wire hole of the zero sequence transformer 34. Preferably, at least one lead-out conductive member 45 is provided with a plug-in part 451 corresponding to the first wiring port 111 of the side wall of the first shell 11; one end of the wiring piece forms a plug-in piece 44, the plug-in piece 44 passes through the wire hole of the zero sequence transformer 34, and the plug-in piece 44 corresponds to the second wiring port 121 of the side wall of the second shell 12; preferably, the plug-in piece 44 is in a sheet structure, the plug-in part 451 is a slot extending into the first wiring port 111, and the plug-in piece 44 extends from the second shell 12 and is inserted into the plug-in part 451 to be plugged and matched with the plug-in part 451. Of course, as other embodiments, the plug-in part 451 can also extend from the first shell 11 and be inserted into the second shell 12 to be plugged and matched. As other embodiments, the plug-in part 451 can also be provided on the wiring piece, and one end of the lead-out conductive member forms the plug-in piece 44 which is inserted into the plug-in part 451 to be plugged and matched. The plug-in connection structure formed by the cooperation of the wiring piece and the lead-out conductive member realizes the connection and power taking of the leakage protection module 3 and the circuit breaker pole 2 at the same time, makes the main circuit pass through the wire hole of the zero sequence transformer 34, omits the wire, is beneficial to reducing the size of the circuit breaker, makes the leakage protection module 3 and the circuit breaker pole 2 be two independent modules, and meets the modular development of the circuit breaker.

[0056] Preferably, the outgoing conductive members are connected to the main circuit of the circuit breaker, that is, the outgoing conductive members are connected to the N-phase main line and one of the L-phase main lines of the circuit breaker pole 2, and the corresponding connection ports of the outgoing conductive members are arranged on the side wall of the first shell 11 and the second shell 12 adjacent to each other, that is, the connection ports are arranged on the side wall of the shell in the thickness direction of the circuit breaker pole 2, and the connection ports are opposite to the connection ports of the zero sequence transformer 34. Specifically, the connection ports include a first connection port 111 arranged in the middle of the side wall of the first shell 11 and a second connection port 121 arranged in the middle of the side wall of the second shell 12, and the number of the first connection ports 111 can correspond to the number of the outgoing conductive members, and the number of the second connection ports 121 corresponds to the number of the connection tabs. There can be only one first connection port 111 and one second connection port 121 on one side of the first shell 11 and the second shell 12, so that the two outgoing conductive members correspond to the same first connection port 111, and the two connection tabs correspond to the same second connection port of the second shell 12. In addition, the two outgoing conductive members can extend into the second shell 12 and be plugged with the two connection tabs, or the two connection tabs can extend outside the second shell 12 and be plugged with the two outgoing conductive members, or one outgoing conductive member extends into the second shell 12 and is plugged with one connection tab, and the other connection tab extends outside the second shell 12 and is plugged with the other outgoing conductive member. The connection ports can correspond to the number of outgoing conductive members and connection tabs, or there can be only one connection port on one side of the first shell 11 and the second shell 12, so that the two outgoing conductive members extend from the same connection port of the first shell 11, and the two connection tabs extend from the same connection port of the second shell 12. The leakage protection module 3 includes two connection terminals, each of which is connected to a connection tab extending out of the leakage protection module 3. The connection tab is plugged with the outgoing conductive member. In this way, when the leakage protection module 3 is plugged with the circuit breaker pole 2, the two connection tabs can be plugged with the L-phase main line and the N-phase main line to take power. Of course, other accessory modules of the circuit breaker can also be connected to the main circuit of the circuit breaker pole 2 in this way to take power.

[0057] Preferably, each circuit breaker pole 2 includes an incoming terminal and an outgoing terminal arranged at both ends of the first shell 11, and a phase main line connected between the incoming terminal and the outgoing terminal. The two connection terminals of the leakage protection module 3 are L-phase outgoing terminal 41-1b and N-phase outgoing terminal 41-2b. This structure does not affect the power taken from the main circuit of the circuit breaker pole 2 by the leakage protection module 3, and can ensure that the normal connection of the circuit breaker pole 2 is not affected when the leakage protection module 3 is not spliced. After splicing the leakage protection module 3, the outgoing terminal of the circuit breaker pole 2 can not be used, and the outgoing terminal can be shielded by a shielding plate.

[0058] Of course, only the incoming terminal or the outgoing terminal can be arranged in the circuit breaker pole 2. In the present embodiment, the incoming terminal is arranged in the circuit breaker pole 2, and the corresponding outgoing terminal is arranged in the leakage protection module 3, that is, the L-pole incoming terminal 41-1a and the N-pole incoming terminal 41-1b are arranged side by side at one end of the first shell 11, and the leakage protection module 3 includes two wiring terminals arranged at the same end of the second shell 12, which are the L-pole outgoing terminal 41-1b and the N-pole outgoing terminal 41-2b, respectively. The L-phase main line of the L-pole is connected between the L-pole incoming terminal 41-1a and the L-pole outgoing terminal 41-1b, and the N-phase main line of the N-pole is connected between the N-pole incoming terminal 41-2a and the N-pole outgoing terminal 41-2b. In this way, after the leakage protection module 3 is spliced with the circuit breaker pole 2, the circuit breaker can be normally wired and used. This structure can save the internal space of the circuit breaker.

[0059] Further, the lead-out conductive member is provided with an elastic plug-in part 451, and the first shell 11 is provided with a wiring terminal at at least one end. Two first wiring ports 111 are arranged on the side wall of the first shell 11, and each plug-in part 451 is provided with a corresponding insertion slot and corresponds to one first wiring port 111. At this time, each plug-in part 451 is provided with an insertion slot, and each plug-in part 451 cooperates with the first wiring port 111. Two second wiring ports 121 are arranged on the side wall of the second shell 12, and two wiring pieces form a plug-in piece 44 corresponding to the second wiring port 121 and correspond to plug-in connection with one plug-in part 451. Preferably, the insertion slot can be plugged in sequence through the first wiring port 111, the second wiring port 121, and the wiring piece. Of course, the wiring piece can also be plugged in sequence through the second wiring port 121, the first wiring port 111, and the insertion slot.

[0060] Further, the lug and / or the lead-out conductive piece correspond to the wire hole of the zero sequence transformer 34, preferably the first lug port 111 and the second lug port 121 correspond to the wire hole of the zero sequence transformer 34, at this time, the first lug port 111 and the second lug port 121 are respectively located in the middle part of the side wall of the first shell 11 and the second shell 12, so that the length of the lug and the lead-out conductive piece can be shortened and the space occupied by them can be reduced, so that the lead-out conductive piece is preferably connected to the component arranged in the middle part of the L pole and the N pole, such as the static contact of the contact mechanism, the short-circuit protection mechanism, etc. In the embodiment, the short-circuit protection mechanism is located in the middle part of the first shell 11, and the zero sequence transformer 34 is located in the middle part of the second shell 12, the short-circuit protection mechanism corresponds to the zero sequence transformer 34, and the lead-out conductive piece of the L pole is connected to the short-circuit protection mechanism, and the lead-out conductive piece of the N pole is connected to the contact mechanism of the N pole, that is, the first lug port 111 is located at the position corresponding to the short-circuit protection mechanism or the position corresponding to the static contact of the side wall of the shell, and the second lug port 121 is located at the position corresponding to the wire hole of the zero sequence transformer 34 of the side wall of the second shell 12. At the same time, the first lug port 111 corresponds to the second lug port 121, and the first lug port 111 also corresponds to the zero sequence transformer 34. In this way, the length of the lead-out conductive piece and the lug can be shortened, which is beneficial to plug-in connection.

[0061] Correspondingly, the leakage test circuit of the leakage protection module 3 takes power from the main circuit, and preferably the second elastic piece 32 is electrically connected to the L pole outlet terminal 41-1b as one power taking end of the leakage test circuit, so that the leakage test circuit can take power from the L phase main circuit, and the other power taking end of the leakage test circuit is directly or indirectly electrically connected to the N pole outlet terminal 41-2b, the first end of the first elastic piece 31 is connected to the zero sequence transformer 34, and the second end of the first elastic piece 31 cooperates with the second end of the first elastic piece 31 to form a breakpoint, so that the second elastic piece 32 can form a breakpoint of the leakage test circuit and also be used to take power for the leakage test circuit, which is beneficial to reduce the number of wires used. In addition, the circuit board 35 in the leakage detection circuit also takes power through the second elastic piece 32, and the third elastic piece 33 is also connected to the circuit board 35, and the second end of the third elastic piece 33 is connected to the second lug 43 as one power taking end of the circuit board 35. Therefore, the circuit board 35 can take power from the main circuit while reducing the number of power taking wires, improving the space utilization and reducing the volume.

[0062] Further, the lug and / or the lead-out conductive piece correspond to the wire hole of the zero sequence transformer 34, preferably the first lug port 111 and the second lug port 121 correspond to the wire hole of the zero sequence transformer 34, at this time, the first lug port 111 and the second lug port 121 are respectively located in the middle part of the side wall of the first shell 11 and the second shell 12, so that the length of the lug and the lead-out conductive piece can be shortened and the space occupied by them can be reduced, so that the lead-out conductive piece is preferably connected to the component arranged in the middle part of the L pole and the N pole, such as the static contact of the contact mechanism, the short-circuit protection mechanism, etc. In the embodiment, the short-circuit protection mechanism is located in the middle part of the first shell 11, and the zero sequence transformer 34 is located in the middle part of the second shell 12, the short-circuit protection mechanism corresponds to the zero sequence transformer 34, and the lead-out conductive piece of the L pole is connected to the short-circuit protection mechanism, and the lead-out conductive piece of the N pole is connected to the contact mechanism of the N pole, that is, the first lug port 111 is located at the position corresponding to the short-circuit protection mechanism or the position corresponding to the static contact of the side wall of the shell, and the second lug port 121 is located at the position corresponding to the wire hole of the zero sequence transformer 34 of the side wall of the second shell 12. At the same time, the first lug port 111 corresponds to the second lug port 121, and the first lug port 111 also corresponds to the zero sequence transformer 34. In this way, the length of the lead-out conductive piece and the lug can be shortened, which is beneficial to plug-in connection.

[0063] In combination Figures 3-6The first embodiment is provided, in which the circuit breaker pole 2 is plugged into the leakage protection module 3, and two terminal pieces are located in the second housing 12. As shown in Figures 1-3 In the L pole, an L pole incoming terminal 41-1a is arranged at one end of the L pole, that is, the L pole incoming terminal 41-1a is arranged at one end of the first housing 11, the contact mechanism of the L pole includes an L pole moving contact and an L pole static contact 231, the L pole moving contact is electrically connected with the L pole incoming terminal 41-1a, the L pole static contact 231 is fixed to one side of the arc extinguishing chamber, the short-circuit protection mechanism is arranged between the arc extinguishing chamber and the handle mechanism, the short-circuit protection mechanism includes a coil assembly, the coil assembly includes a coil skeleton and a coil 25 wound outside the coil skeleton, a second terminal of the coil 25 is connected with the L pole static contact 231, a first terminal 251 of the coil 25 is connected with a connecting plate, the connecting plate is used as an outgoing conductive member of the L pole and extends outward in a direction perpendicular to the plane of the arc extinguishing chamber, the connecting plate is arranged along the thickness direction of the circuit breaker pole 2, and in the figure, the connecting plate is arranged along the gap between the short-circuit protection mechanism and the arc extinguishing chamber, and an adapter 451 is arranged at the end of the connecting plate away from the first terminal 251.

[0064] The N-pole and the L-pole are arranged side by side in the same first shell 11, and an N-pole incoming line terminal 41-2a is arranged at one end of the N-pole, that is, the L-pole incoming line terminal 41-1a and the N-pole incoming line terminal 41-2a are arranged side by side at one end of the first shell 11, the contact mechanism of the N-pole includes a N-pole movable contact and a N-pole static contact, wherein the N-pole static contact is arranged side by side with the L-pole static contact 231, the static contact plate of the N-pole static contact is arranged in the horizontal direction, that is, the static contact plate of the N-pole static contact corresponds to the gap between the coil assembly of the L-pole and the arc-extinguishing chamber, the middle edge of the static contact plate of the N-pole static contact extends outward to form an outgoing conductive member, the outgoing conductive members of the N-pole and the L-pole extend side by side to one side of the first shell 11, that is, the outgoing conductive member of the N-pole extends to one side of the second shell 12 along a plane perpendicular to the arc-extinguishing chamber, that is, the outgoing conductive member of the N-pole extends along the thickness direction of the circuit breaker pole 2, each outgoing conductive member corresponds to a first wiring port 111, and the plug-in part 451 of each outgoing conductive member is matched with the first wiring port 111, the plug-in part 451 is provided with a plug slot extending out of the first wiring port 111, of course, the plug slot can also be located in the first shell 11 or in the first wiring port 111, and preferably, the shell side wall is provided with the first wiring port 111, that is, one side of the first shell 11 includes a first cover 13 and a second cover 14 spliced with each other, and one of the first wiring ports 111 is located at the splicing position of the first cover 13 and the second cover 14, and such a splicing structure is beneficial to ensuring the electrical gap and insulation between the two first wiring ports 111, further, an insulating part 112 is protruded at the lower side edge of each first wiring port 111, the insulating part 112 plays an insulating role to prevent the adjacent outgoing conductive members from being short-circuited, and can also play a plug-in guiding role in cooperation with the second wiring port 121. The insulating part 112 is provided corresponding to the first wiring port 111 and protrudes from the shell side wall, and the insulating part 112 can be provided only at the lower side edge of the first wiring port 111 or can be provided around the first wiring port 111.

[0065] In the present embodiment, as shown in Figure 2 The plug-in part 451 includes a first contact piece and a second contact piece, one end of the second contact piece is bent to be connected with the first contact piece, and the other end of the second contact piece is arranged in a spaced manner with the first contact piece, so that the gap between the first contact piece and the second contact piece forms a plug slot, the first contact piece is in a straight plate structure, and the first contact piece is formed by the static contact plate of the N-pole static contact or a connecting plate connected with the first wiring end 251 of the coil 25, so that the space occupied by the plug slot can be saved and the cost can be reduced, the middle part of the second contact piece is bent and close to the first contact piece, so that the middle gap of the plug slot is the narrowest, and the plug-in part 451 is similar to a hairpin, which is convenient for elastic plug-in cooperation with the plug-in piece 44 of the first wiring piece 42 and the second wiring piece 43 and is beneficial to keeping the wiring stable.

[0066] In the leakage protection module 3, a button slot is arranged on the upper part of the second shell 12, two wiring terminals are arranged side by side at one end of the second shell 12, and one wiring piece is connected to each wiring terminal, one of which is the L pole outgoing terminal 41-1b, the wiring piece connected to the L pole outgoing terminal 41-1b is the first wiring piece 42, the other wiring terminal is the N pole outgoing terminal 41-2b, the wiring piece connected to the N pole outgoing terminal 41-2b is the second wiring piece 43, the first wiring piece 42 is connected to the L pole lead-out conductive member, and the second wiring piece 43 is connected to the N pole lead-out conductive member, at this time, one L pole incoming terminal 41-1a and one N pole incoming terminal 41-2a are arranged at one end of the entire circuit breaker shell, and one L pole outgoing terminal 41-1b and one N pole outgoing terminal 41-2b are arranged at the other end of the shell.

[0067] Two second wiring ports 121 are arranged on the side wall of the second shell 12 facing the first shell 11, a zero sequence transformer 34 is assembled at the position corresponding to the second wiring port 121, a circuit board 35 is arranged on the side of the zero sequence transformer 34 away from the wiring terminal, and the side edge of the circuit board 35 is preferably provided with an arc-shaped recessed area, the zero sequence transformer 34 is correspondingly assembled in the arc-shaped recessed area, and a jack is arranged on the circuit board 35 adjacent to the arc-shaped recessed area, a test button 36 is slidingly assembled in the button slot, a first elastic member 31 is located between the test button 36 and the zero sequence transformer 34, a second elastic member 32 is arranged on one side of the first elastic member 31 and above the zero sequence transformer 34, the second end of the first elastic member 31 and the second end of the second elastic member 32 are spaced apart to form a breakpoint, the middle part of the test button 36 abuts against the first elastic member 31, the first end of the second elastic member 32 is inserted into the circuit board 35, Figure 5 The second end of the second elastic member 32 is connected to the first wiring piece 42 for power supply, the first end of the first elastic member 31 is connected to the zero sequence transformer 34, and specifically, the first end of the first elastic member 31 is connected to the fourth pin of the zero sequence transformer 34, and the position of the fourth pin is preferably close to the first elastic member 31. A third elastic member 33 is connected to the circuit board 35, and the third elastic member 33 is used to electrically connect the circuit board 35 and the N pole outgoing terminal 41-2b.

[0068] The zero sequence mutual inductor 34 comprises a core and a leakage test loop winding and a leakage current detection winding wound outside the core, a through hole is arranged in the middle of the core, an electrical isolation plate 345 is arranged in the through hole, the through hole is divided into a first through hole and a second through hole which are parallel to each other by the electrical isolation plate 345, preferably, the first through hole and the second through hole correspond to the two second wiring ports 121 one by one respectively, the first connecting piece 42 and the second connecting piece 43 correspond to pass through the two second wiring ports 121 to form two parallel connecting pieces 44, the two connecting pieces 44 are inserted with the connecting parts 451 of the two lead conductive members, and the electrical isolation between the first connecting piece 42 and the second connecting piece 43 is realized by the electrical isolation plate 345.

[0069] The leakage test loop winding comprises a third pin and a fourth pin, the fourth pin abuts against the first elastic member 31, and the third pin is inserted with the circuit board 35, the leakage current detection winding comprises a first pin and a second pin, the first pin and the second pin are connected with the circuit board 35 respectively, wherein the first pin, the second pin and the third pin are located on the same side of the core, and the fourth pin is located on the other side of the core, that is, the first pin, the second pin and the third pin extend side by side along the radial direction of the core, and the fourth pin extends outward along the tangential direction of the core, so that the fourth pin is located on the side close to the first elastic member 31, and the first pin, the second pin and the third pin are inserted with the insertion holes of the circuit board 35, that is, the first insertion hole, the second insertion hole and the third insertion hole, the first pin, the second pin and the third pin of the zero sequence mutual inductor 34 can be connected with the circuit board 35 by tin soldering.

[0070] As Figure 5 , 6As shown, the first connector 42 includes an integrally formed first conductive plate 42a, an extension plate 42c, and a second conductive plate 42b. One end of the first conductive plate 42a serves as the first end of the first connector 42 and is connected to an N-pole output terminal 41-2b or an L-pole output terminal 41-1b. In the figure, the first end of the first connector 42 is connected to the L-pole output terminal 41-1b. The other end of the first conductive plate 42a is bent away from the L-pole output terminal 41-1b, making the first conductive plate 42a generally L-shaped. One end of the extension plate 42c is connected to the side of the other end of the first conductive plate 42a, and the other end of the extension plate 42c is oriented away from the first conductive plate 42a. The extension plate 42c in the figure is bent upwards at one end, making the extension plate 42c into an L-shaped plate structure. The surface of the extension plate 42c is perpendicular to the surface of the first conductive plate 42a. A first abutment groove 421 is provided on the side of the extension plate 42c. The first end of the second elastic member 32 elastically abuts against the first abutment groove 421. The elastic abutment between the second elastic member 32 and the first abutment groove 421 has the advantages of convenient wiring, eliminating the need for wires and occupying little space. The second conductive plate 42b serves as the second end of the first connecting piece 42. One end of the second conductive plate 42b is connected to the middle side of the extension plate 42c, and the other end of the second conductive plate 42b passes through the wire hole of the current transformer 34. Figure 5 , 6 One end of the extension plate 42c and the second conductive plate 42b is close to the side of the zero-sequence transformer 34 away from the second terminal 121. At this time, the first connecting piece 42 and the second connecting piece 43 pass through the wire hole of the zero-sequence transformer 34 side by side, which helps to achieve a stable connection with the lead-out conductive component.

[0071] like Figure 5 , 6 As shown, the second terminal piece 43 has an overall L-shaped plate structure. The second terminal piece 43 is vertically positioned between the terminal block and the circuit board 35, and is located near the zero-sequence transformer 34 on the side opposite to the second terminal port 121. A second abutment groove 431 is formed on the first end side of the second terminal piece 43, and the second end of the third elastic member 33 abuts against the second abutment groove 431. Figure 5 The third elastic element 33 is preferably a torsion spring. In addition, the first end of the second connecting piece 43 is connected to the N pole output terminal 41-2b through a wire. Preferably, a connecting conductive plate is also connected between the wire and the N pole output terminal 41-2b. The second end of the second connecting piece 43 passes through the second wire hole of the zero sequence transformer 34 and a second wiring port 121 of the second housing 12 in sequence to form a connector piece 44.

[0072] In this embodiment, during the process of plugging and unplugging the leakage protection module 3 and the circuit breaker pole 2, the first terminal piece 42 and the second terminal piece 43 are fixed by the side wall of the second housing 12 to prevent shaking.

[0073] In combination Figures 6-9 A second embodiment is provided, in which one lug extends outside the second housing 12 and is plugged with one outgoing electrically conductive member, and the other outgoing electrically conductive member extends into the second housing 12 and is plugged with the other lug, that is, the plug-in part 451 of one outgoing electrically conductive member extends outside the first housing 11 through the first lug port 111, and in the second housing 12 is plugged with the other lug.

[0074] The L pole and the N pole are assembled together in the same first housing 11 as the first embodiment, wherein the L pole and the N pole are arranged side by side, wherein the N pole comprises the same N pole incoming line terminal 41-2a, the N pole contact mechanism and the outgoing electrically conductive member connected to the N pole static contact as the N pole described above, and the L pole comprises the same L pole incoming line terminal 41-1a, the arc extinguishing chamber, the L pole contact mechanism, the short circuit protection mechanism and the overload protection mechanism as the L pole described above, and the difference from the L pole described above is that the first lug 251 of the coil 25 is used as the outgoing electrically conductive member of the L pole, and preferably the first lug 251 of the coil 25 also extends outwardly in a direction perpendicular to the plane of the arc extinguishing chamber, that is, the first lug 251 extends outwardly in the thickness direction of the pole 2 of the circuit breaker, and the first lug 251 of the coil 25 extends out of a first lug port 111 of the first housing 11 and corresponds to extend into the second housing 12, and an electrically conductive area is formed at the end of the first lug 251 of the coil 25, which can be plugged with the first lug 42 of the leakage protection module 3 as the plug-in part 451, and preferably the electrically conductive area is formed by stripping the insulating layer of the enameled wire, and at this time the first lug port 111 through which the first lug 251 of the coil 25 passes, the electrically conductive area extends out of the first housing 11 after passing through the first lug port 111 to form the plug-in part 451.

[0075] The leakage protection module 3 is assembled in the second shell 12 with the same structure as the first embodiment. The leakage protection module 3 comprises the L-phase outgoing terminal 41-1b, the N-phase outgoing terminal 41-2b, the zero sequence transformer 34 and the circuit board 35, which are the same as the leakage protection module 3 described above. The second connecting tab 43 connected to the N-phase outgoing terminal 41-2b is the same as the second connecting tab 43 of the first embodiment. The third elastic member 33 is connected between the circuit board 35 and the second connecting tab 43. The second end of the third elastic member 33 abuts against the second abutting groove 431 of the second connecting tab 43. Different from the leakage protection module 3 described above, the first connecting tab 42 connected to the L-phase outgoing terminal 41-1b no longer passes through the wire passing hole of the zero sequence transformer 34. The first connecting tab 42 is inserted into the conductive area of the first connecting end 251 of the coil 25, which passes through the first wire passing hole of the zero sequence transformer 34. In addition, the test button 36, the first elastic member 31 and the second elastic member 32 are arranged above the zero sequence transformer 34. The first elastic member 31 is connected to the zero sequence transformer 34. One end of the second elastic member 32 is connected to the circuit board 35. The second elastic member 32 is connected to the conductive area of the first connecting end 251 to obtain power.

[0076] As shown in Figure 8 The first connecting tab 42 comprises the first conductive plate 42a and the second conductive plate 42b which are integrally formed. One end of the first conductive plate 42a is connected to one terminal (the L-phase outgoing terminal 41-1b) as the first end of the first connecting tab 42. The other end of the first conductive plate 42a is bent away from the L-phase outgoing terminal 41-1b. The first conductive plate 42a as a whole has an L-shaped structure. One end of the second conductive plate 42b is connected to the side of the first conductive plate 42a. The second conductive plate 42b extends away from the first conductive plate 42a and approaches the wire passing hole of the zero sequence transformer 34. The first connecting tab 42 does not pass through the wire passing hole of the zero sequence transformer 34. This is beneficial to shorten the length of the first connecting tab 42 and reduce the space occupied by the first connecting tab 42, Figure 8The plate surface of the second conductive plate 42b is arranged along the side of the zero sequence mutual inductor 34 opposite to the second wiring port 121, the second conductive plate 42b serves as the second end of the first wiring piece 42, the plate surface of the second conductive plate 42b is perpendicular to the plate surface of the first conductive plate 42a, a first abutting groove 421 is arranged at the side of the second conductive plate 42b, preferably, the first abutting groove 421 is located at the lower side edge of the second conductive plate 42b, the first abutting groove 421 corresponds to the threading hole of the zero sequence mutual inductor 34, the first wiring end 251 of the coil 25 can be correspondingly plugged into the first abutting groove 421, the conductive area of the first wiring end 251 is in abutting cooperation with the first abutting groove 421, so that the L phase main line between the leakage protection module 3 and the L pole is connected, the first wiring end 251 can be regarded as a plug-in part 451 extending into the second shell 12, the second elastic member 32 is in abutting cooperation with the conductive area of the first wiring end 251, and the conductive area is in abutting cooperation with the first abutting groove 421, which has the advantages of convenient wiring, omission of wires, and small space occupation.

[0077] As a third embodiment, both wiring pieces pass through the second shell 12, and extend into the first shell 11 through the second wiring port 121 and the first wiring port 111 in sequence, that is, both wiring pieces pass through the first threading hole and the second threading hole of the zero sequence mutual inductor 34 respectively and are plugged into the two lead-out conductive members respectively, preferably, in the embodiment, the plug-in part 451 is arranged on the two wiring pieces, the plug-in piece 44 is arranged on one end of the lead-out conductive member, and the plug-in part 451 can select the same plug-in groove as the above-mentioned embodiments. The plug-in part 451 includes two first contact pieces and second contact pieces arranged at intervals, and of course, the structure of the plug-in part 451 and the plug-in piece 44 is a matching concave-convex structure, and the specific structure is not limited to the above-mentioned structure.

[0078] In addition, when the circuit breaker includes three L poles, one N pole and the leakage protection module 3, one L pole and one N pole can be assembled together in a first shell 11 adjacent to the leakage protection module 3, at this time, the leakage protection module 3 and the L pole and the N pole adopt the connection mode of the above-mentioned three embodiments; or, three L poles and one N pole are assembled in four first shells 11 respectively, one lead-out conductive member can pass through the adjacent first shell 11, so that two lead-out conductive members finally extend into the middle part of the same side wall of the same first shell 11 side by side, preferably, the lead-out conductive member and the wiring piece correspond to the threading hole of the zero sequence mutual inductor 34, and the leakage protection module 3 can adopt the structure of the above-mentioned three embodiments.

[0079] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating relative importance.

[0080] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all should be considered as falling within the protection scope of the present application.

Claims

1. An earth leakage protection module comprising a second housing (12) within which is assembled an earth leakage detection circuit and an earth leakage trip mechanism driven by the earth leakage detection circuit, the earth leakage detection circuit comprising two line terminals and a zero sequence transformer (34), characterised in that: The leakage protection module (3) is assembled on one side of the circuit breaker pole (2), the second shell (12) is provided with a second wiring port (121) on the side wall adjacent to the circuit breaker pole (2), the zero sequence transformer (34) is located in the middle of the second shell (12), the second wiring port (121) is located on the side wall of the second shell (12) and is arranged opposite to the threading hole of the zero sequence transformer (34), two wiring terminals are arranged at the same end of the second shell (12), and the two wiring terminals are respectively an L pole outgoing terminal (41-1b) and an N pole outgoing terminal (41-2b), the leakage detection circuit further comprises at least one wiring sheet, one end of the at least one wiring sheet is connected with the wiring terminal, the other end of the at least one wiring sheet passes through the threading hole of the zero sequence transformer (34) to form a terminal block (44), and the terminal block (44) is arranged opposite to the second wiring port (121) of the side wall of the second shell (12).

2. The arc fault protection module of claim 1, wherein: A circuit board (35) is arranged on the side of the zero sequence transformer (34) away from the wiring terminal, an arc-shaped recessed area is formed in one side edge of the circuit board (35), the zero sequence transformer (34) is correspondingly arranged in the arc-shaped recessed area, the circuit board (35) is connected with the zero sequence transformer (34), and a controller for driving the leakage release mechanism is arranged on the circuit board (35); the leakage release mechanism comprises a release device (37) driven by the leakage detection circuit, a push plate (39) and an indicating piece (38) are correspondingly arranged on one side of a top rod of the release device (37), and an avoiding hole is arranged in the side wall of the second shell (12) corresponding to the push plate (39).

3. The arc fault protection module of claim 1, wherein: The leakage detection circuit comprises two wiring sheets, one end of each of the two wiring sheets is connected with the two wiring terminals, and the other end of each of the two wiring sheets passes through the threading hole of the zero sequence transformer (34) to form two terminal blocks (44) arranged side by side.

4. The arc fault protection module of claim 3, wherein: The zero sequence transformer (34) is provided with an electrical isolation plate (345) in the threading hole, the electrical isolation plate (345) divides the threading hole into a first threading hole and a second threading hole, and the two wiring sheets pass through the first threading hole and the second threading hole respectively.

5. The leakage protection module according to claim 1, characterized in that: the wiring sheet connected with the L pole outgoing terminal (41-1b) is a first wiring sheet (42), the first wiring sheet (42) is located on one side of the zero sequence transformer (34) and does not pass through the threading hole of the zero sequence transformer (34) or the first wiring sheet (42) passes through the threading hole of the zero sequence transformer (34), the wiring sheet connected with the N pole outgoing terminal (41-2b) is a second wiring sheet (43), and the second wiring sheet (43) passes through the threading hole of the zero sequence transformer (34).

6. The arc fault protection module of claim 5, wherein: the first wiring sheet (42) passes through the threading hole of the zero sequence transformer (34), and the first wiring sheet (42) comprises a first conductive plate (42a), a second conductive plate (42b) and an extension plate (42c), one end of the first conductive plate (42a) is connected with the L pole outgoing terminal (41-1b) as a first end of the first wiring sheet (42), and the other end of the first conductive plate (42a) is bent away from the L pole outgoing terminal (41-1b), One end of the extension plate (42c) is connected to the other end of the first conductive plate (42a), and the other end of the extension plate (42c) is bent away from the first conductive plate (42a), The second conductive plate (42b) is a second end of the first terminal (42), one end of the second conductive plate (42b) is connected to the side of the extension plate (42c) away from the first conductive plate (42a), and the other end of the second conductive plate (42b) passes through the wire hole of the zero sequence transformer (34).

7. The arc fault protection module of claim 6, wherein: A first abutting groove (421) is formed on the side of the extension plate (42c), and a leakage test circuit is also assembled in the second shell (12), The leakage test circuit includes a test button (36), a first elastic member (31), and a second elastic member (32), and the first elastic member (31) and the second elastic member (32) cooperate to form a breakpoint of the leakage test circuit; The leakage detection circuit includes a circuit board (35) connected to the zero sequence transformer (34); One end of the second elastic member (32) is in elastic abutment with the first abutting groove (421), and the other end is connected to the circuit board (35).

8. The arc fault protection module of claim 5, wherein The first terminal (42) does not pass through the wire hole of the zero sequence transformer (34), and the first terminal (42) includes a first conductive plate (42a) and a second conductive plate (42b), One end of the first conductive plate (42a) is connected to the L pole terminal (41-1b) as a first end of the first terminal (42), and the other end of the first conductive plate (42a) is bent away from the L pole terminal (41-1b), The second conductive plate (42b) is a second end of the first terminal (42), one end of the second conductive plate (42b) is connected to the other end of the first conductive plate (42a), and the second conductive plate (42b) extends away from the first conductive plate (42a) and approaches the wire hole of the zero sequence transformer (34).

9. The arc fault protection module of claim 8, wherein: A first abutting groove (421) is formed on the other end side of the second conductive plate (42b), and the first abutting groove (421) corresponds to the wire hole of the zero sequence transformer (34).

10. The arc fault protection module of claim 5, wherein: The second terminal (43) is in a whole plate structure, the second terminal (43) is electrically connected to the N pole terminal (41-2b), and the second end of the second terminal (43) passes through the wire hole of the zero sequence transformer (34) to form a terminal (44).

11. The arc fault protection module of claim 10, wherein: A second abutting groove (431) is formed on the first end side of the second terminal (43), The leakage detection circuit includes a third elastic member (33) and a circuit board (35) connected to the zero sequence transformer (34); One end of the third elastic member (33) is in elastic abutment with the second abutting groove (431), and the other end is connected to the circuit board (35).

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