WO2025007682A1 - Drain electrode structure, mounting structure for mutual inductor, and circuit breaker - Google Patents

Abstract

A drain electrode structure, a mounting structure for a mutual inductor, and a circuit breaker. The drain electrode structure comprises: an electronic component board (4), the electronic component board (4) being configured to be electrically connected to an N-pole wiring board (2); a release device (5) welded on the electronic component board (4), the release device (5) being electrically connected to the electronic component board (4); a first elastic member (6) welded on the electronic component board (4), a first end of the first elastic member (6) being electrically connected to the electronic component board (4), and a second end of the first elastic member (6) being configured to be electrically connected to an L-pole wiring board (3); and a mutual inductor (7) welded on the electronic component board (4), the mutual inductor (7) being electrically connected to the electronic component board (4), and the mutual inductor (7) being configured to be coupled with an L-phase main line (8) and an N-phase main line (9). The release device (5), the first elastic member (6), the mutual inductor (7), and the electronic component board (4) form a modular structure.

Description

Leakage electrode structure, installation structure of transformer and circuit breaker

This application claims the priority of Chinese patent applications filed with the China Patent Office on July 6, 2023, with application numbers 202310824815.0 and 202321765045.9. The entire contents of the above applications are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of low-voltage electrical appliances, for example, to a leakage electrode structure, a mounting structure of a mutual inductor, and a circuit breaker.

Background Art

Low-voltage circuit breakers can be used to distribute electrical energy and protect lines and power equipment from overload and short circuit. They can also be used for infrequent line switching and infrequent motor starting. With the continuous development of Internet of Things technology and artificial intelligence technology, the miniaturization and modularization of circuit breakers have become a trend.

In the related art, the leakage electrode structure of the residual current operated circuit breaker is complex, there are many wires connecting multiple components, the assembly process is complicated, and it is not conducive to realizing automated assembly production.

Summary of the invention

The present application provides a leakage electrode structure, a transformer installation structure and a circuit breaker, which adopt a modular structure to facilitate automated assembly.

The present application provides a drain electrode structure, comprising:

An electronic component board, wherein the electronic component board is configured to be electrically connected to an N-pole terminal board;

A release device is welded on the electronic component board, and the release device is electrically connected to the electronic component board;

A first elastic member, welded to the electronic component board, wherein a first end of the first elastic member is electrically connected to the electronic component board, and a second end of the first elastic member is configured to be electrically connected to an L-pole wiring board;

A mutual inductor, welded on the electronic component board, and the mutual inductor is electrically connected to the electronic component board, and the mutual inductor is configured to be coupled with an L-phase main line and an N-phase main line;

The release, the first elastic member, the mutual inductor and the electronic component board form a modular structure.

The present application also provides a mutual inductor installation structure, which is applied to any of the above-mentioned drain electrode structures, including:

The mutual inductor is configured to be welded on the electronic component board, and the mutual inductor is electrically connected to the electronic component board. The mutual inductor is provided with a first fixing member and a second fixing member;

A shell, wherein a third fixing member and a fourth fixing member are provided on the inner side of the shell, wherein the third fixing member is detachably connected to the first fixing member to limit the axial movement of the mutual inductor, and the fourth fixing member is detachably connected to the second fixing member to limit the radial movement of the mutual inductor.

The present application also provides a circuit breaker, comprising a shell, an L-pole terminal plate, an N-pole terminal plate and a drain electrode structure as described above, wherein the drain electrode structure is arranged in the shell, the first end of the L-pole terminal plate is placed in the shell and is electrically connected to the second end of the first elastic member, and the first end of the N-pole terminal plate is placed in the shell and is electrically connected to the electronic component board.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the internal structure of a circuit breaker provided in an embodiment of the present application;

FIG2 is a partial structural schematic diagram of a drain electrode structure provided in an embodiment of the present application;

FIG3A is a schematic structural diagram of a first elastic member provided in an embodiment of the present application;

FIG3B is another schematic diagram of the structure of the first elastic member provided in an embodiment of the present application;

FIG3C is a schematic diagram of a structure of an electronic component board provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of a mutual inductor provided in an embodiment of the present application;

FIG5 is a schematic diagram of the structure of a housing provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a mutual inductor provided in an embodiment of the present application installed on a housing.

In the figure:
1. Shell; 2. N-pole terminal board; 3. L-pole terminal board; 4. Electronic component board; 5. Release; 6.
first elastic member; 7, mutual inductor; 8, L-phase main circuit; 9, N-phase main circuit; 10, second elastic member; 11, test button; 12, clamping member; 121, clamping plate; 122, buckle; 13, plug-in member; 14, push plate; 15, indicator;
41. Card interface; 42. First welding hole; 43. Second welding hole; 44. Third welding hole; 45.
Fourth welding hole; 46, fifth welding hole; 47, sixth welding hole;
61, first straight section; 62, second straight section; 63, third straight section; 64, fourth straight section;
65, fifth straight section; 66, first connecting section; 67, second connecting section; 68, sixth straight section;
71. Transformer body; 72. First boss; 73. Second boss; 74. First connection end; 75.
Second connection end; 76, center hole;
101, inclined plate; 102, vertical plate; 103, horizontal plate;
131. arc-shaped protrusion; 132. plug-in block; 133. connecting rib.

DETAILED DESCRIPTION

The technical solutions of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being “above”, “above”, and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

As shown in FIG. 1 and FIG. 2 , the present application provides a circuit breaker, which includes a housing 1 , an L-pole terminal board 3 , an N-pole terminal board 2 and a drain electrode structure.

The side wall of the shell 1 has two installation cavities, which communicate with the outside of the shell 1 and the internal space of the shell 1. The main conductor of the external circuit can be accommodated in the installation cavity. The first end of the L-pole terminal board 3 and the first end of the N-pole terminal board 2 are respectively placed in the shell 1, and the second end of the L-pole terminal board 3 and the second end of the N-pole terminal board 2 are respectively placed in the installation cavity, and the L-pole terminal board 3 and the N-pole terminal board 2 can be conductively connected to the main conductor respectively.

The drain electrode structure is arranged in the housing 1, and the drain electrode structure includes an electronic component board 4, a release 5, a first elastic member 6 and a mutual inductor 7. The electronic component board 4 is electrically connected to the N-pole terminal board 2, and the electronic component board 4 is electrically connected to the first end of the N-pole terminal board 2 placed in the housing 1. The release 5 is welded to the electronic component board 4, and the release 5 is electrically connected to the electronic component board 4. The first elastic member 6 is welded to the electronic component board 4, the first end of the first elastic member 6 is electrically connected to the electronic component board 4, and the second end of the first elastic member 6 is electrically connected to the first end of the L-pole terminal board 3. The mutual inductor 7 is welded to the electronic component board 4, and the mutual inductor 7 is electrically connected to the electronic component board 4, and the mutual inductor 7 is coupled to the L-phase main line 8 and the N-phase main line 9. The release 5, the first elastic member 6, the mutual inductor 7 and the electronic component board 4 form a modular structure.

When the mutual inductor 7 in the leakage electrode structure detects a leakage fault, the electronic component board 4 controls the trip device 5 The top rod of the trip device 5 moves to open the circuit breaker. After the top rod of the trip device 5 completes the action, the reset spring of the trip device 5 drives the top rod to reset. The first elastic member 6 takes power through the L-pole terminal board 3, and forms a closed loop with the electronic component board 4 and the N-pole terminal board 2 to supply power to the electronic component board 4.

In the leakage electrode structure provided in the present embodiment, the trip unit 5, the first elastic member 6 and the mutual inductor 7 are respectively welded to the electronic component board 4, and the trip unit 5, the first elastic member 6, the mutual inductor 7 and the electronic component board 4 are integrated together, and a modular design is adopted, which replaces the wire connection method mainly used in the related art, reduces the use of wires, simplifies the assembly structure of the trip unit 5, the first elastic member 6 and the mutual inductor 7, and is conducive to the automatic assembly production of the leakage electrode structure. At the same time, the module integrating the trip unit 5, the first elastic member 6, the mutual inductor 7 and the electronic component board 4 can also be directly installed, which simplifies the assembly process of the circuit breaker and facilitates installation.

In some embodiments, the releaser 5 is horizontally arranged above the mutual inductor 7, a third welding hole 44 is provided on the electronic component board 4, the pins on the releaser 5 are inserted into the third welding hole 44, and are fixed to the electronic component board 4 by welding.

A push plate 14 and an indicator 15 are provided on one side of the top rod of the release 5. When a leakage fault occurs, the action of the top rod of the release 5 triggers the push plate 14 to rotate, so that the linkage part drives the lock to rotate so that the operating mechanism is tripped, and the indicator 15 is actuated to indicate leakage.

In some embodiments, a card interface 41 is provided at the edge of the electronic component board 4, and the first elastic member 6 includes a card connection portion, which is carded into the card interface 41. After the first end of the first elastic member 6 is connected to the electronic component board 4, the card connection portion is carded into the card interface 41 to fix the position of the first elastic member 6, so that the first end of the first elastic member 6 can be welded to the electronic component board 4 by a wave soldering process.

Optionally, in order to simplify the structure of the first elastic member 6 , the card interface 41 is disposed on a side of the electronic component board 4 close to the L-pole wiring board 3 , so as to facilitate the connection between the first elastic member 6 and the L-pole wiring board 3 .

The electronic component board 4 is provided with a first welding hole 42, and the first end of the first elastic member 6 is inserted into the first welding hole 42 and welded to the electronic component board 4. The first end of the first elastic member 6 is placed in the first welding hole 42, which improves the welding strength between the first elastic member 6 and the electronic component board 4.

In some embodiments, in combination with FIG. 2 and FIG. 3A , the first elastic member 6 includes a first straight section 61, a second straight section 62, a third straight section 63 and a fourth straight section 64. The first end of the first straight section 61 is electrically connected to the electronic component board 4. The first end of the first straight section 61 is inserted into the first welding hole 42 of the electronic component board 4 and welded. The second end of the first straight section 61 is vertically connected to the first end of the second straight section 62. The second end of the second straight section 62 is vertically connected to the first end of the third straight section 63. The second end of the third straight section 63 is vertically connected to the fourth straight section 64. The fourth straight section 64 is parallel to the second straight section 62. The length of the first straight section 61 is greater than the length of the third straight section 63. The fourth straight section 64 is a clamping portion. The end of the first straight section 61 away from the second straight section 62 is inserted into the first welding hole 42. Since the fourth straight section 64 needs To be inserted into the card interface 41 , the second straight section 62 and the fourth straight section 64 need to be parallel to ensure that the first straight section 61 is inserted into the first welding hole 42 and the fourth straight section 64 is inserted into the card interface 41 .

In some embodiments, the leakage electrode structure also includes a second elastic member 10, the first end of the second elastic member 10 is spaced apart from the third end of the first elastic member 6, and the first end of the second elastic member 10 can be deformed to contact the third end of the first elastic member 6, and the second end of the second elastic member 10 is electrically connected to the electronic component board 4. The second elastic member 10 contacts the first elastic member 6 to form a leakage test circuit, and the leakage test circuit generates a leakage current. After the mutual inductor 7 detects the leakage signal, the electronic component board 4 controls the trip device 5 to operate and complete the leakage test. The first elastic member 6 can draw power for the electronic component board 4 while drawing power for the leakage test circuit, avoiding the setting of too many power-drawing wires and simplifying the structure.

Based on the above-mentioned structure of the first elastic member 6, the first elastic member 6 also includes a fifth straight section 65, which is connected to the fourth straight section 64 through a first connecting section 66. The first connecting section 66 is obliquely arranged, and the fifth straight section 65 is vertically arranged. One end of the fifth straight section 65 is the third end.

Optionally, the first straight section 61, the second straight section 62, the third straight section 63, the fourth straight section 64, the first connecting section 66 and the fifth straight section 65 are an integrated structure, which are formed in sequence by bending. The first elastic member 6 also has a second end, which is connected to the L-pole terminal board 3, and is extended and bent from the fifth straight section 65 to form a portion parallel to the fifth straight section 65, and then further bent to form a second connecting section 67, which is inclined relative to the fifth straight section 65, and the second connecting section 67 continues to extend and bend to form a sixth straight section 68, which is parallel to the fifth straight section 65, and the end of the sixth straight section 68 is the second end, which is arranged to be connected to the L-pole terminal board 3.

A hole may be provided on the L-pole wiring board 3, and the second end of the first elastic member 6 is inserted into the hole and fixed by welding.

Optionally, as shown in Figures 3B and 3C, a sixth welding hole 47 is provided on the electronic component board 4, and the first elastic member 6 includes a third straight section 63, a fourth straight section 64, and a fifth straight section 65. The first end of the third straight section 63 is welded to the sixth welding hole 47 of the electronic component board 4, and the second end of the third straight section 63 is vertically connected to the fourth straight section 64.

The fifth straight section 65 is connected to the fourth straight section 64 through the first connecting section 66. The first connecting section 66 is arranged obliquely, and the fifth straight section 65 is arranged vertically. One end of the fifth straight section 65 is the third end.

Optionally, the third straight section 63, the fourth straight section 64, the first connecting section 66 and the fifth straight section 65 are an integrated structure, which are formed in sequence by bending. The first elastic member 6 also has a second end, which is connected to the L-pole terminal plate 3, and is extended and bent from the fifth straight section 65 to form a portion parallel to the fifth straight section 65, and then further bent to form a second connecting section 67, which is inclined relative to the fifth straight section 65, and the second connecting section 67 continues to extend and bend to form a sixth straight section 68, which is parallel to the fifth straight section 65, and the end of the sixth straight section 68 is the second end, which is arranged to be connected to the L-pole terminal plate 3.

In some embodiments, the second elastic member 10 includes an integrally connected inclined plate 101, a vertical plate 102, and a horizontal plate 103, the end of the inclined plate 101 is the first end, and is spaced apart from the first elastic member 6, the end of the inclined plate 101 is spaced apart from the fifth straight section 65, and the inclined plate 101 can be deformed to contact the fifth straight section 65. The vertical plate 102 is electrically connected to the electronic component board 4 through a wire.

In order to make the first end of the second elastic member 10 deform, in some embodiments, the leakage electrode structure also includes a test button 11, and the test button 11 is slidably arranged, and the first end of the test button 11 abuts against the first end of the second elastic member 10. By pressing the test button 11, the first end of the second elastic member 10 can be deformed and contact the third end of the first elastic member 6, which is convenient for manual operation to perform leakage detection.

The shell 1 is provided with a mounting hole, and the first end of the test button 11 passes through the mounting hole and is placed in the shell 1. The test button 11 is slidably connected to the shell 1. Pressing the test button 11 can deform the first end of the second elastic member 10.

In some embodiments, as shown in Figures 2 and 4, a first boss 72 is provided on the mutual inductor 7, and a second welding hole 43 is provided on the electronic component board 4. The first boss 72 is inserted into the second welding hole 43 and welded to the electronic component board 4. The provision of the first boss 72 can prevent the welding point between the mutual inductor 7 and the electronic component board 4 from being subjected to stress, thereby causing an unreliable connection between the two.

The transformer 7 includes a transformer body 71, on which a first boss 72 is arranged on the circumferential side wall. One end of the first boss 72 protrudes from the surface of the transformer body 71 to be inserted into the second welding hole 43. After the first boss 72 is inserted into the electronic component board 4, the side of the transformer body 71 can fit the electronic component board 4.

Optionally, one, two, three or more first bosses 72 may be provided, and may be provided according to the size of the mutual inductor 7 to improve the connection strength between the mutual inductor 7 and the electronic component board 4 .

The mutual inductor 7 is also provided with a first connection end 74 and a second connection end 75, which are arranged on the circumferential side wall of the mutual inductor body 71. The electronic component board 4 is provided with a fourth welding hole 45 and a fifth welding hole 46, the first connection end 74 is inserted into the fourth welding hole 45, the second connection end 75 is inserted into the fifth welding hole 46, and the first connection end 74 is welded to the fourth welding hole 45, and the second connection end 75 is welded to the fifth welding hole 46 by welding, thereby realizing the electrical connection between the mutual inductor 7 and the electronic component board 4.

After the mutual inductor 7, the first elastic member 6 and the trip unit 5 are respectively fixed to the electronic component board 4, the integrated module needs to be installed in the housing 1 of the circuit breaker. In some embodiments, referring to Figures 4, 5 and 6, the mutual inductor 7 is provided with a first fixing member and a second fixing member, and the inner side of the housing 1 is provided with a third fixing member and a fourth fixing member, the third fixing member is detachably connected to the first fixing member to limit the mutual inductor 7 from moving in the axial direction, and the fourth fixing member is detachably connected to the second fixing member to limit the mutual inductor 7 from moving in the radial direction. The mutual inductor 7 is connected to the third fixing member and the fourth fixing member on the inner side of the housing 1 through the first fixing member and the second fixing member. The fixing parts are connected to limit the axial and radial movement of the transformer 7 respectively, and fix the transformer 7 on the housing 1. Since the electronic component board 4 is connected to the transformer 7, it can also effectively avoid the displacement of the electronic component board 4 when assembling the circuit breaker, thereby achieving the fixation of the position of the electronic component board 4.

The first fixing member includes a second boss 73 disposed on the transformer 7, and the third fixing member includes a clamping member 12 disposed on the inner side of the housing 1. The clamping member 12 is clamped on the second boss 73 to limit the axial movement of the transformer 7, so as to fix the transformer 71 on the housing 1 and prevent the electronic component board 4 from being displaced. The second boss 73 is disposed on the circumferential side wall of the transformer body 71, and the clamping member 12 is clamped on the second boss 73 to make the transformer body 71 fit with the inner side surface of the housing 1.

Optionally, the clamping member 12 includes a clamping plate, a first end of the clamping plate is connected to the shell 1, and a buckle is provided at the second end of the clamping plate. The clamping plate has a certain elasticity. When the mutual inductor 7 is installed, the mutual inductor 7 can squeeze the buckle to cause the clamping plate to elastically deform, thereby providing an escape space for the second boss 73 until the mutual inductor 7 is installed in place. The buckle abuts against the side of the second boss 7 away from the shell 1, thereby limiting the mutual inductor 7 from moving along its axial direction.

The number of the clamping parts matches the number of the second bosses 73 , and one or more can be provided according to installation requirements, which is not specifically limited here.

In some embodiments, a central hole is provided in the middle of the transformer 7, and the central hole is provided in the middle of the transformer body 71. The second fixing member includes the central hole, and the fourth fixing member includes a plug-in member 13 provided on the inner side of the housing 1, and the plug-in member 13 is plugged into the central hole to limit the movement of the transformer 7 in its radial direction, which can effectively prevent the electronic component board 4 from being displaced during the assembly of the circuit breaker and affecting the stability of the connection between the electronic component board 4 and other components.

Optionally, the connector 13 includes a stepped arc-shaped protrusion 131, the first end of the arc-shaped protrusion 131 is connected to the shell 1, and a plurality of plug-in blocks 132 are protruded at intervals on the step surface of the arc-shaped protrusion 131. The plug-in blocks 132 are higher than the surface of the arc-shaped protrusion 131 opposite to the shell 1. The plug-in block 132 is plugged into the center hole of the transformer 7, and the plug-in block 132 abuts against the hole wall of the center hole. The surface of the arc-shaped protrusion 131 opposite to the shell 1 is configured to support the transformer 7.

A plurality of connection ribs 133 are radially provided on the outer side wall of the arc-shaped protrusion 131 . The connection ribs 133 connect the arc-shaped protrusion 131 and the housing 1 , thereby improving the connection strength between the arc-shaped protrusion 131 and the housing 1 .

The drain electrode structure in the circuit breaker provided in the present application is an integrated module, and the entire module can be directly installed, which is not only convenient for assembly, but also simplifies the assembly process of the circuit breaker, and is conducive to the realization of automated assembly production of the circuit breaker.

In summary, in the drain electrode structure provided by the present application, the tripper, the first elastic member and the mutual inductor are respectively welded to the electronic component board, and the tripper, the first elastic member, the mutual inductor and the electronic component board are integrated together. The modular design replaces the wire connection method in the related art, reduces the use of wires, simplifies the assembly structure of the releaser, the first elastic member and the mutual inductor, and is conducive to the automated assembly production of the leakage electrode structure. At the same time, the module integrating the releaser, the first elastic member, the mutual inductor and the electronic component board can also be directly installed, which simplifies the assembly process of the circuit breaker and facilitates installation.

The installation structure of the transformer provided in the present application is a transformer welded to an electronic component board, which integrates the transformer and the electronic component board together. A modular design is adopted to replace the method of mainly connecting with wires in the related art, thereby reducing the use of wires and facilitating the automated assembly and production of the leakage electrode structure. At the same time, the transformer is connected to the third and fourth fixing members on the inner side of the shell through the first and second fixing members to respectively limit the axial and radial movement of the transformer and fix the transformer on the shell. Since the electronic component board is connected to the transformer, it can also effectively avoid the displacement of the electronic component board when assembling the circuit breaker, thereby achieving the fixation of the position of the electronic component board.

The circuit breaker provided in the present application has a drain electrode structure as an integrated module, and the entire module can be directly installed, which not only facilitates assembly, but also simplifies the assembly process of the circuit breaker, and is conducive to the realization of automated assembly production of the circuit breaker.

Claims (20)

A drain electrode structure, comprising: An electronic component board (4), wherein the electronic component board (4) is configured to be electrically connected to the N-pole wiring board (2); A release (5) is welded on the electronic component board (4), and the release (5) is electrically connected to the electronic component board (4); A first elastic member (6) is welded to the electronic component board (4), a first end of the first elastic member (6) is electrically connected to the electronic component board (4), and a second end of the first elastic member (6) is configured to be electrically connected to the L-pole wiring board (3); A mutual inductor (7) is welded on the electronic component board (4), and the mutual inductor (7) is electrically connected to the electronic component board (4), and the mutual inductor (7) is configured to be coupled with an L-phase main line (8) and an N-phase main line (9); The release (5), the first elastic member (6), the mutual inductor (7) and the electronic component board (4) form a modular structure. The drain electrode structure according to claim 1, wherein a card interface (41) is provided at an edge of the electronic component board (4), and the first elastic member (6) comprises a card connection portion, and the card connection portion is carded into the card interface (41). The drain electrode structure according to claim 2, wherein the first elastic member (6) comprises a first straight section (61), a second straight section (62), a third straight section (63) and a fourth straight section (64), the first end of the first straight section (61) is electrically connected to the electronic component board (4), the second end of the first straight section (61) is vertically connected to the first end of the second straight section (62), the second end of the second straight section (62) is vertically connected to the first end of the third straight section (63), the second end of the third straight section (63) is vertically connected to the fourth straight section (64), the fourth straight section (64) is parallel to the second straight section (62), the length of the first straight section (61) is greater than the length of the third straight section (63), and the fourth straight section (64) is the clamping portion. The drain electrode structure according to claim 3, wherein a first welding hole (42) is provided on the electronic component board (4), and the first straight section (61) is inserted into the first welding hole (42) and welded to the first welding hole (42). The drain electrode structure according to claim 1 further comprises a second elastic member (10), wherein the first end of the second elastic member (10) is spaced apart from the third end of the first elastic member (6), and the first end of the second elastic member (10) can be deformed to contact the third end of the first elastic member (6), and the second end of the second elastic member (10) is electrically connected to the electronic component board (4). The drain electrode structure according to claim 5, further comprising a test button (11), wherein the test button (11) is slidably arranged, and a first end of the test button (11) is connected to the second elastic member (10). The first end of the second elastic member (10) abuts against the first end of the first elastic member (6), and by pressing the test button (11), the first end of the second elastic member (10) can be deformed to contact the third end of the first elastic member (6). The drain electrode structure according to claim 1, wherein the mutual inductor (7) is provided with a first boss (72), the electronic component board (4) is provided with a second welding hole (43), and the first boss (72) is inserted into the second welding hole (43) and welded to the second welding hole (43). The drain electrode structure according to claim 1, wherein a sixth welding hole (47) is provided on the electronic component board (4), the first elastic member (6) comprises a third straight section (63) and a fourth straight section (64), a first end of the third straight section (63) is welded to the sixth welding hole (47) of the electronic component board (4), and a second end of the third straight section (63) is vertically connected to the fourth straight section (64). A mounting structure of a mutual inductor, applied to the drain electrode structure according to any one of claims 1 to 8, comprising: A mutual inductor (7) is arranged to be welded on the electronic component board (4), and the mutual inductor (7) is electrically connected to the electronic component board (4), and a first fixing member and a second fixing member are provided on the mutual inductor (7); the mutual inductor (7) comprises a mutual inductor body (71), and a center hole (76) is provided in the middle of the mutual inductor body (71); A shell (1), wherein a third fixing member and a fourth fixing member are provided on the inner side of the shell (1), wherein the third fixing member is detachably connected to the first fixing member to limit the mutual inductor (7) from moving in an axial direction thereof, and the fourth fixing member is detachably connected to the second fixing member to limit the mutual inductor (7) from moving in a radial direction thereof. According to the installation structure of the mutual inductor of claim 9, the center hole (76) is the second fixing member, and the fourth fixing member includes a plug-in member (13), and the plug-in member (13) is inserted into the center hole (76) to limit the mutual inductor (7) from moving in its radial direction. According to the installation structure of the mutual inductor according to claim 10, the connector (13) comprises a stepped arc-shaped protrusion (131), the first end of the arc-shaped protrusion (131) is connected to the housing (1), a plurality of plug-in blocks (132) are protruded at intervals on the step surface of the arc-shaped protrusion (131), and the plug-in blocks (132) are arranged higher than the surface of the arc-shaped protrusion (131) opposite to the housing (1), and the plurality of plug-in blocks (132) are inserted into the center hole (76) and abut against the hole wall of the center hole (76). According to the installation structure of the mutual inductor according to claim 11, the outer side wall of the arc-shaped protrusion (131) is radially connected with a plurality of connecting ribs (133), and the plurality of connecting ribs (133) connect the arc-shaped protrusion (131) and the housing (1). The installation structure of the mutual inductor according to claim 9, wherein the mutual inductor (7) is provided with a first boss (72), the electronic component board (4) is provided with a second welding hole (43), and the first A boss (72) is configured to be inserted into the second welding hole (43) and welded to the second welding hole (43). According to the installation structure of the mutual inductor of claim 9, the first fixing member includes a second boss (73) arranged on the mutual inductor (7), and the third fixing member includes a clamping member (12) arranged on the inner side of the housing (1), and the clamping member (12) is clamped on the second boss (73) to limit the mutual inductor (7) from moving along its axial direction. The installation structure of the mutual inductor according to claim 14, wherein the clamping member (12) comprises a clamping plate (121), a first end of the clamping plate (121) being elastically connected to the housing (1), and a second end of the clamping plate (121) being provided with a buckle (122), and the buckle (122) abuts against a side of the second boss (73) facing away from the housing (1). According to the installation structure of the mutual inductor of claim 9, the mutual inductor (7) is provided with a first connection end (74) and a second connection end (75), the electronic component board (4) is provided with a fourth welding hole (45) and a fifth welding hole (46), the first connection end (74) is configured to be inserted into the fourth welding hole (45) and welded to the fourth welding hole (45), and the second connection end (75) is configured to be inserted into the fifth welding hole (46) and welded to the fifth welding hole (46). A circuit breaker, comprising a housing (1), an L-pole terminal plate (3), an N-pole terminal plate (2), and a drain electrode structure according to any one of claims 1 to 8, wherein the drain electrode structure is arranged in the housing (1), the first end of the L-pole terminal plate (3) is placed in the housing (1) and is electrically connected to the second end of the first elastic member (6), and the first end of the N-pole terminal plate (2) is placed in the housing (1) and is electrically connected to the electronic component board (4). The circuit breaker according to claim 17, wherein the mutual inductor (7) is provided with a first fixing member and a second fixing member, and the inner side of the housing (1) is provided with a third fixing member and a fourth fixing member, the third fixing member is detachably connected to the first fixing member to limit the mutual inductor (7) from moving in the axial direction thereof, and the fourth fixing member is detachably connected to the second fixing member to limit the mutual inductor (7) from moving in the radial direction thereof. The circuit breaker according to claim 18, wherein the first fixing member includes a second boss (73) arranged on the mutual inductor (7), and the third fixing member includes a clamping member (12) arranged on the inner side of the housing (1), and the clamping member (12) is clamped on the second boss (73) to limit the mutual inductor (7) from moving along its axial direction. The circuit breaker according to claim 18 or 19, wherein the second fixing member includes a center hole (76) arranged in the middle of the transformer (7), and the fourth fixing member includes a plug-in member (13) arranged on the inner side of the housing (1), and the plug-in member (13) is inserted into the center hole (76) to limit the movement of the transformer (7) in its radial direction.