CN110911248A

CN110911248A - Earth leakage circuit breaker

Info

Publication number: CN110911248A
Application number: CN201911234469.0A
Authority: CN
Inventors: 薛炜梁; 祁卫华; 许利战; 史胜余
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-03-24
Anticipated expiration: 2039-12-05
Also published as: CN110911248B

Abstract

The invention provides a leakage circuit breaker, which comprises a neutral line pole mechanism, a phase line pole mechanism and a test mechanism, wherein the test mechanism comprises a button, a first elastic piece and a second elastic piece; the first elastic piece is communicated with the circuit board through a first lead, the second elastic piece is communicated with the arc striking plate through a second lead, the second elastic piece is also communicated with a third lead, and the third lead is communicated with the circuit board through a tripping unit. The button of the test mechanism drives the first elastic piece to be pressed down, so that the first elastic piece and the second elastic piece are conducted mutually, namely the first elastic piece and the circuit board can be conducted mutually, after the lower end of the leakage circuit breaker is connected into the main loop, the leakage circuit breaker can be normally tripped when the test button is pressed down, and the phenomenon that the circuit board, the leakage tripping coil and the like in the leakage circuit breaker are burnt cannot be caused.

Description

Earth leakage circuit breaker

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a residual current circuit breaker.

Background

The current electric leakage circuit breaker product is usually vertically installed in a distribution box, and common electric leakage circuit breaker products are upper wiring products, the upper end of the electric leakage circuit breaker product is connected with a power line, and the lower end of the electric leakage circuit breaker product is connected with a load. With diversification of electric equipment, the layout of various low-voltage protection devices in household and industrial distribution boxes becomes complicated, more and more users put forward the demand of the leakage circuit breaker with the lower wire inlet function, and the lower wire inlet product is the load connected to the upper end of the lower wire inlet product, and the power line connected to the lower end of the lower wire inlet product.

The residual current circuit breaker is in the inner structure, and the circuit board needs to be connected into the main circuit power supply as its working power supply, and the circuit board needs to get electricity from the binding post of leading-out terminal, and after the circuit breaker is tripped, the power on the circuit board is disconnected promptly. If the power is taken from the wire inlet end, the power supply on the electronic circuit board is not disconnected and is always electrified after the circuit breaker is tripped. That is, if an upper wiring product is connected to a circuit requiring a lower wiring function, when a test button is pressed or there is an electric leakage action, an electronic circuit board, an electric leakage trip coil and the like in the electric leakage circuit breaker will be burnt, and the electric leakage protection function is disabled. There is therefore a need for a residual current circuit breaker that can achieve a drop-in line.

Disclosure of Invention

The invention aims to provide a residual current circuit breaker, which aims to solve the technical problem that in the prior art, a power supply on a circuit board is not disconnected and is always electrified, and if the phenomenon of wrong wiring occurs, the residual current circuit breaker can cause the failure of a residual current protection function.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is an earth leakage breaker including: the testing device comprises a neutral line pole mechanism, a phase line pole mechanism and a testing mechanism, wherein the neutral line pole mechanism comprises a circuit board and a tripping unit; the phase electrode mechanism comprises an arc striking plate; the testing mechanism comprises a button, a first elastic piece and a second elastic piece, wherein the second elastic piece is positioned on one side of the first elastic piece away from the button; the first elastic piece is communicated with the circuit board through a first lead, the second elastic piece is communicated with the arc striking plate through a second lead, the second elastic piece is further communicated with a third lead, and the third lead is communicated with the circuit board through a tripping unit.

Furthermore, the LED lamp further comprises a shell, wherein a wire inlet end is arranged at the lower end of the shell, a wire outlet end is arranged at the lower end of the shell, the circuit board is communicated with the wire inlet end, and the arc striking plate is communicated with the wire outlet end.

Furthermore, a zero sequence current transformer is further arranged on one side of the circuit board, and the first lead is communicated with the circuit board through the zero sequence current transformer.

Furthermore, the phase line pole mechanism further comprises a phase line contact component, a wiring board and a thermal bimetallic strip, wherein the thermal bimetallic strip is communicated with the phase line contact component, and the wiring board, the thermal bimetallic strip and one end part of the arc striking plate are in butt joint.

Furthermore, the neutral pole mechanism further comprises a contact unit, the contact unit comprises a movable contact component and a fixed contact, the circuit board is communicated with the fixed contact, and the movable contact component is also communicated with the fixed contact.

Furthermore, one side of the circuit board is connected with a first elastic connecting piece and a second elastic connecting piece, one side of the moving contact component is provided with a fixed column, two ends of the first elastic connecting piece are respectively connected with the circuit board and the fixed column, and two ends of the second elastic connecting piece are respectively connected with the fixed column and the moving contact.

Furthermore, the first elastic connecting piece adopts a torsion spring, a torsion arm on one side of the torsion spring is fixedly connected with the circuit board, and a torsion arm on the other side of the torsion spring is abutted to the fixing column.

Furthermore, the inner side of the shell is convexly provided with a limiting column, and the middle part of the torsion spring is sleeved on the limiting column.

Furthermore, the inner side of the shell is also convexly provided with a limit stop used for limiting one side torsion arm of the torsion spring away from the fixed column, and the two side torsion arms of the torsion spring are elastically compressed, deformed and clamped between the limit stop and the fixed column.

Furthermore, the second elastic connecting piece adopts a tension spring, one end of the tension spring is fixedly connected with the fixed column, and the other end of the tension spring is fixedly connected with the moving contact component.

The electric leakage circuit breaker provided by the invention has the beneficial effects that: compared with the prior art, the leakage circuit breaker has the advantages that the phase line pole mechanism can realize the functions of current overload and short circuit protection, the phase line pole mechanism can bear leakage current for detection and realize leakage tripping action, the testing mechanism can detect whether the leakage circuit breaker can realize the protection function or not, the button of the testing mechanism drives the first elastic piece to be pressed down, so that the first elastic piece is communicated with the second elastic piece, namely, the first elastic piece is communicated with the circuit board, the second elastic piece, the tripping unit and the circuit board are communicated, after the lower end of the leakage circuit breaker is connected into the main loop, the leakage circuit breaker can be normally tripped when the testing button is pressed down, and the phenomenon that the circuit board, the leakage tripping coil and the like in the leakage circuit breaker are burnt cannot be caused.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a neutral pole mechanism of a residual current circuit breaker according to an embodiment of the present invention;

FIG. 2 is a partially enlarged schematic view of a portion A in FIG. 1;

FIG. 3 is a partially enlarged schematic view of a portion B of FIG. 1;

fig. 4 is a schematic structural diagram of a phase pole mechanism of a residual current circuit breaker according to an embodiment of the present invention.

Description of reference numerals:

1. a neutral pole mechanism; 2. a phase electrode mechanism; 3. a testing mechanism; 4. a housing; 11. a circuit board; 12. a trip unit; 13. a zero sequence current transformer; 14. a contact unit; 15. a first elastic connecting member; 16. a second elastic connecting piece; 17. fixing a column; 111. a through hole; 141. a moving contact assembly; 142. static contact; 1411. a moving contact; 1412. an operation unit; 21. an arc striking plate; 22. a phase contact assembly; 23. a wiring board; 24. a thermal bimetallic strip; 25. an electromagnetic system; 31. a button; 32. a first elastic member; 33. a second elastic member; 34. a first lead; 35. a second lead; 36. a third lead; 41. a wire inlet end; 42. a wire outlet end; 43. a limiting column; 44. and a limit stop.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 4 together, the earth leakage breaker of the present invention will now be described. The residual current circuit breaker comprises a neutral line pole mechanism 1, a phase line pole mechanism 2 and a test mechanism 3, wherein the neutral line pole mechanism 1 comprises a circuit board 11 and a tripping unit 12; the phase electrode mechanism 2 comprises an arc striking plate 21; the testing mechanism 3 comprises a button 31, a first elastic piece 32 and a second elastic piece 33 positioned on one side of the first elastic piece 32 far away from the button 31, and the button 31 is pressed down to drive the first elastic piece 32 to abut against the second elastic piece 33; the first elastic element 32 is communicated with the circuit board 11 through a first lead 34, the second elastic element 33 is communicated with the arc striking plate 21 through a second lead 35, the second elastic element 33 is further communicated with a third lead 36, and the third lead 36 is communicated with the circuit board 11 through a tripping unit 12.

Compared with the prior art, the electric leakage circuit breaker provided by the invention has the advantages that the phase-phase pole mechanism 2 can realize the functions of current overload and short-circuit protection, the phase-phase pole mechanism 2 can bear leakage current for detection and realize the action of electric leakage tripping, the testing mechanism 3 can detect whether the electric leakage circuit breaker can realize the protection function, the button 31 of the testing mechanism 3 drives the first elastic piece 32 to be pressed down, so that the first elastic piece 32 and the second elastic piece 33 are conducted, namely, the first elastic piece 32 and the circuit board 11 can be conducted, the second elastic piece 33, the tripping unit 12 and the circuit board 11 are conducted, after the lower end of the electric leakage circuit breaker is connected into a main loop, the electric leakage circuit breaker can be normally tripped when the testing button 31 is pressed down, and the phenomenon that the circuit board 11, the electric leakage tripping coil and the like in the electric leakage circuit breaker are burnt cannot occur.

Specifically, the first lead 34, the second lead 35, and the third lead 36 are all common flexible leads, wherein the neutral pole mechanism 1 and the phase pole mechanism 2 are generally distributed on two sides of the electrical leakage breaker, and therefore the second lead 35 needs to pass through the casing 4 between the neutral pole mechanism 1 and the phase pole mechanism 2 to achieve communication. The arc ignition plate 21 and the second elastic member 33 are generally located on opposite sides of the earth leakage breaker, and the second lead 35 may pass through the bottom or above the circuit board 11. The first elastic member 32 is an elastic plate, one end of the first elastic member 32 is disposed on a moving path of the button 31, the other end of the first elastic member 32 can be fixed on a fixing member or a side wall of the trip unit 12, the second elastic member 33 is also disposed on the moving path of the button 31, and the second elastic member 33 is disposed on a side of the first elastic member 32 away from the button 31, so that when the button 31 is pressed down, the first elastic member 32 and the second elastic member 33 can be communicated with each other. The first elastic part 32 can be directly connected with the circuit board 11, the second elastic part 33 is provided with two leads, wherein the second lead 35 is directly communicated with the arc striking plate 21, the arc striking plate 21 is communicated with the outlet end 42, and the outlet end 42 and the arc striking plate 21 are uncharged after the circuit breaker is tripped; when the third lead 36 is communicated with the circuit board 11 through the tripping unit 12, the third lead 36 cannot be conducted after the circuit breaker is tripped.

Further, referring to fig. 1 to 4 together, as a specific embodiment of the electrical leakage circuit breaker provided by the present invention, the electrical leakage circuit breaker further includes a housing 4, a wire inlet end 41 is disposed at a lower end of the housing 4, a wire outlet end 42 is disposed at a lower end of the housing 4, the circuit board 11 is conducted with the wire inlet end 41, and the arc striking plate 21 is conducted with the wire outlet end 42. Specifically, the residual current circuit breaker adopts the residual current circuit breaker of inlet wire down, and the lower extreme of residual current circuit breaker is connected with the power for inlet wire end 41 this moment promptly, and the upper end is connected with the load for outlet wire end 42, and it can satisfy the vertical demand of installing the residual current circuit breaker who has inlet wire function down at block terminal or other requirements. The circuit board 11 is conducted with the inlet wire end 41, the arc striking plate 21 is conducted with the outlet wire end 42, the moving contact 1411 of the phase wire pole is conducted with the outlet wire end 42, and the fixed contact 142 of the phase wire pole is conducted with the inlet wire end 41 through the electromagnetic system 25.

Further, referring to fig. 1 to 4, as a specific embodiment of the electrical leakage breaker provided by the present invention, a zero sequence current transformer 13 is further disposed on one side of the circuit board 11, and the first lead 34 is communicated with the circuit board 11 through the zero sequence current transformer 13. Specifically, when an electric shock or leakage fault occurs in the circuit, the zero sequence current transformer 13 outputs a zero sequence current at the secondary side of the zero sequence current transformer 13, so that the equipment protection on the connected secondary circuit is operated, and the first lead 34 can penetrate through the zero sequence current transformer 13 to be conducted with the circuit board 11, thereby ensuring the electric shock or leakage accident of the whole loop of the test mechanism 3 through the zero sequence current transformer 13, further avoiding the phenomenon that the circuit board 11, the leakage trip coil and the like in the leakage breaker are burnt out, and protecting the whole leakage breaker.

Further, referring to fig. 1 to 4, as a specific embodiment of the residual current circuit breaker provided by the present invention, the phase pole mechanism 2 further includes a phase contact assembly 22, a terminal plate 23, and a thermal bimetal 24, the thermal bimetal 24 is communicated with the phase contact assembly 22, and the terminal plate 23, the thermal bimetal 24 and an end of the arc plate 21 are abutted. Specifically, the phase line contact assembly 22 also includes a moving contact, a fixed contact and an operating unit for controlling the fixed contact to move towards the fixed contact, which are conventional technologies in the prior art, one side of the fixed contact is further connected with an electromagnetic system 25, the electromagnetic system 25 can be communicated with the incoming line terminal 41, and the wiring board 23 can be communicated with the outgoing line terminal 42. The thermal bimetallic strip 24 and the wiring board 23 form a thermal trip system, the thermal bimetallic strip 24 and the thermal trip system also have a feedback rod member which can be connected with the phase line contact assembly 22, the thermal bimetallic strip 24 can be separated from the wiring board 23 when overheated, and the feedback rod member can drive the moving contact and the fixed contact to be separated by utilizing the principle of a link mechanism, so that the effect of thermal trip is realized. The thermal trip system can also be a conventional thermal trip system in the prior art.

Further, referring to fig. 1 to 4, as a specific embodiment of the electrical leakage breaker provided by the present invention, the neutral pole mechanism 1 further includes a contact unit 14, the contact unit 14 includes a moving contact component 141 and a fixed contact 142, the circuit board 11 is conducted with the fixed contact 142, and the moving contact component 141 is also communicated with the fixed contact 142. Specifically, the movable contact assembly 141 includes a movable contact 1411 and an operation unit 1412 for driving the movable contact 1411 to move, the operation unit 1412 may be linked with the operation unit 1412 of the phase and pole mechanism 2, the movable contact 1411 is communicated with the wire outlet end 42, the fixed contact 142 is communicated with the wire inlet end 41 through the circuit board 11, when the movable contact 1411 is abutted against the fixed contact 142, the movable contact 1411 may be connected with the fixed contact 142, and meanwhile, the movable contact 1411 may be communicated with the movable contact 1411 through a wire or a connecting member.

Specifically, the neutral pole mechanism 1 further includes a reset device, and the reset device is matched with the operation unit 1412, and can drive the moving contact 1411 to move, so that the moving contact 1411 is separated from the stationary contact 142. The specific structure of the resetting device can be the prior art.

Further, referring to fig. 1 and fig. 3, as a specific embodiment of the electrical leakage breaker provided by the present invention, one side of the circuit board 11 is connected to a first elastic connecting piece 15 and a second elastic connecting piece 16, one side of the moving contact assembly 141 is provided with a fixing post 17, two ends of the first elastic connecting piece 15 are respectively connected to the circuit board 11 and the fixing post 17, and two ends of the second elastic connecting piece 16 are respectively connected to the fixing post 17 and the moving contact 1411. Specifically, the first elastic connecting element 15 can be directly connected to the circuit board 11, the second elastic connecting element 16 can be directly connected to the moving contact assembly 141, and the first elastic connecting element 15 and the second elastic connecting element 16 are made of conductive materials, generally made of iron wires, copper wires or other conductive metal wires. The movable contact assembly 141 needs to move, so that the second elastic connecting piece 16 can ensure the connection relationship between the fixed column 17 and the movable contact 1411, and can avoid the mixed winding of excessive leads inside due to the direct use of the leads. First elastic connection piece 15 lug connection fixed column 17 and circuit board 11 also can utilize first elastic connection piece 15 to have certain elasticity, also can not take place the cracked phenomenon of welding department under the effect of slight external force, can guarantee the stability of getting the electric structure between fixed column 17 and the circuit board 11, guarantees leakage circuit breaker's stable normal work.

Further, referring to fig. 3, as a specific embodiment of the residual current circuit breaker provided by the present invention, the first elastic connecting member 15 is a torsion spring, a torsion arm on one side of the torsion spring is fixedly connected to the circuit board 11, and a torsion arm on the other side of the torsion spring is abutted to the fixing column 17. Specifically, the torsional spring is the standard component, and it can direct purchase, and manufacturing cost is lower, and can play better effect that switches on to the both sides torque arm of torque arm respectively with circuit board 11 and fixed column 17 fixed connection, it can play better effect that switches on, also has elasticity between the torque arm of the both sides of torsional spring, mobilizable needs when can satisfying welding or installation, and the suitability is stronger.

The circuit board 11 is provided with a through hole 111, the torque arm on one side is inserted into the through hole 111, and the outer edge of the torque arm is welded with the through hole 111. Wherein, the welding hole that sets up promptly when through-hole 111 on the circuit board 11 is circuit board 11 production, and the torque arm can wear to locate wherein, then the outer fringe of torque arm and the inner edge welding of through-hole 111 to realize switching on of torque arm and circuit board 11, compare in the flattening welding among the prior art, its stability after the welding is higher and be difficult to appear cracked problem, and the torque arm also can not become flat, has made things convenient for the circulation effect of electric current.

Further, referring to fig. 3, as a specific embodiment of the residual current circuit breaker provided by the present invention, a limiting post 43 is convexly disposed on an inner side of the housing 4, and an intermediate portion of the torsion spring is sleeved on the limiting post 43. Specifically, the middle part of the torsion spring is formed by winding a spring strip into a coil, the limiting column 43 is convexly arranged on the inner side surface of the shell 4, and the middle part can be directly sleeved on the limiting column 43, so that the position of the torsion spring is limited, and the torsion spring is prevented from deviating to influence the connection effect when being fixed.

Further, referring to fig. 1 to 4, as a specific embodiment of the residual current circuit breaker provided by the present invention, a limit stop 44 for limiting a torsion arm at one side of the torsion spring away from the fixed column 17 is further protruded at the inner side of the housing 4, and the torsion arms at two sides of the torsion spring are elastically compressed and deformed to be clamped between the limit stop 44 and the fixed column 17. Specifically, with two torque arm elastic compression of both sides, and the outer fringe and the positive stop 44 looks butt of one side torque arm, the outer fringe and the fixed column 17 looks butt of opposite side torque arm have outside expanded elastic restoring force between the torque arm of both sides this moment, can guarantee the fixed stability of whole torsional spring, avoid appearing the pine and take off and contact failure's phenomenon. The limit stop 44 may be disposed only on one side of the torsion arm away from the fixing post 17, or may be disposed on two opposite sides of the torsion arm, which is not limited herein.

Further, referring to fig. 1 to 4, as a specific embodiment of the electrical leakage breaker provided by the present invention, the second elastic connecting element 16 is a tension spring, one end of the tension spring is fixedly connected to the fixed column 17, and the other end of the tension spring is fixedly connected to the movable contact assembly 141. Specifically, the tension spring is an elastic member having fixing portions at two ends thereof, and the two ends thereof can be respectively and fixedly connected with the fixed column 17 and the moving contact assembly 141, that is, the connection stability of the moving contact assembly 141 and the fixed column can be still ensured when the moving contact assembly moves. Wherein, the extension spring can also be replaced by other connecting rods or connecting rings with elasticity and conductivity.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. Earth leakage circuit breaker, characterized in that: comprising,

a neutral-pole mechanism (1), the neutral-pole mechanism (1) comprising a circuit board (11) and a trip unit (12);

a phase-wire-pole mechanism (2), the phase-wire-pole mechanism (2) comprising an arc striking plate (21); and

A test mechanism (3), the test mechanism (3) comprising a button (31), a first elastic member (32) and a second elastic member (32) located on a side of the first elastic member (32) away from the button (31) an elastic member (33), the button (31) is pressed down to drive the first elastic member (32) to abut against the second elastic member (33);

The first elastic member (32) is communicated with the circuit board (11) through a first lead (34), and the second elastic member (33) and the arc striking plate (21) are connected through a second lead (34). 35) is connected, the second elastic member (33) is also connected with the third lead (36), and the third lead (36) is connected with the circuit board (11) through the trip unit (12).

2. The earth leakage circuit breaker according to claim 1, characterized in that it further comprises a casing (4), the lower end of the casing (4) is provided with an incoming wire end (41), and the casing (4) An outlet end (42) is provided at the lower end of the wire, the circuit board (11) and the inlet end (41) are connected, and the arc striking plate (21) is connected to the outlet end (42).

3. The leakage circuit breaker according to claim 1, characterized in that: one side of the circuit board (11) is further provided with a zero-sequence current transformer (13), and the first lead (34) is connected to the circuit board (11) Connected through the zero-sequence current transformer (13).

4. The earth leakage circuit breaker according to claim 1, characterized in that: the phase-line pole mechanism (2) further comprises a phase-line contact assembly (22), a wiring board (23) and a thermal bimetal (24) , the thermal bimetal (24) is communicated with the phase line contact assembly (22), the wiring board (23), the thermal bimetal (24) and the arc striking plate (21) one end abuts.

5. The earth leakage circuit breaker according to claim 2, characterized in that: the neutral pole mechanism (1) further comprises a contact unit (14), and the contact unit (14) comprises a moving contact assembly ( 141) and a static contact (142), the circuit board (11) is in conduction with the static contact (142), and the moving contact assembly (141) is also connected with the static contact (142) Pass.

6. The leakage circuit breaker according to claim 5, characterized in that: one side of the circuit board (11) is connected with a first elastic connecting piece (15) and a second elastic connecting piece (16), and the moving contact One side of the head assembly (141) is provided with a fixing column (17), and both ends of the first elastic connecting piece (15) are respectively connected with the circuit board (11) and the fixing column (17), so Two ends of the second elastic connecting piece (16) are respectively connected with the fixing column (17) and the movable contact (1411).

7. The leakage circuit breaker according to claim 6, characterized in that: the first elastic connecting member (15) adopts a torsion spring, and a torsion arm of one side of the torsion spring is fixedly connected to the circuit board (11). , the torsion arm of the other side of the torsion spring is in contact with the fixing column (17).

8 . The leakage circuit breaker according to claim 7 , wherein a limit post ( 43 ) is protruded from the inner side of the casing ( 4 ), and the middle part of the torsion spring is sleeved on the limit post. 9 . (43) on.

9. The earth leakage circuit breaker according to claim 8, characterized in that: the inner side of the casing (4) is further protruded with a limiter for limiting the torsion arm of the torsion spring on one side away from the fixing column (17). A stop block (44), the torsion arms on both sides of the torsion spring are elastically compressed and deformed to be engaged between the limit stop block (44) and the fixing column (17).

10. The earth leakage circuit breaker according to any one of claims 6 to 9, characterized in that: the second elastic connecting member (16) adopts a tension spring, and one end of the tension spring is connected to the fixing post (17) Fixed connection, and the other end is fixedly connected with the movable contact assembly (141).