CN113725040A

CN113725040A - Leakage protection system and circuit breaker of switch electrical apparatus

Info

Publication number: CN113725040A
Application number: CN202110857454.0A
Authority: CN
Inventors: 龚根华; 高汉林; 戴海龙; 黄明俊; 刘章良; 杨述; 吴子嘉
Original assignee: Zhejiang Yongji Electric Co ltd
Current assignee: Zhejiang Yongji Electric Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-11-30
Anticipated expiration: 2041-07-28
Also published as: CN113725040B

Abstract

The invention provides a leakage protection system and a breaker of a switch electric appliance, comprising: the device comprises a shell, a first assembly cavity and a second assembly cavity, wherein a partition plate is arranged in the shell to divide an inner cavity of the shell into the first assembly cavity and the second assembly cavity which are arranged side by side; the L-pole circuit breaking module is arranged in the first assembly cavity and comprises a handle, an L-pole movable contact frame, a jump buckle which is pivoted on the L-pole movable contact frame and is in linkage fit with the handle, and a lock catch which is pivoted on the L-pole movable contact frame in a resettable manner and is in buckle fit with the jump buckle; and the electric leakage protection module is arranged in the second assembly cavity and comprises an electric leakage release, an unlocking lever and an N-pole movable contact frame, the unlocking lever and the N-pole movable contact frame are coaxially pivoted on the shell, one side of the unlocking lever is connected to the electric leakage release, the other side of the unlocking lever is provided with a transversely extending unlocking part, and the N-pole movable contact frame and the L-pole movable contact frame are connected through a linkage shaft penetrating through the linkage avoiding hole to synchronously swing. The invention has the advantages of more compact structure, smaller volume and more reliable mechanism linkage.

Description

Leakage protection system and circuit breaker of switch electrical apparatus

Technical Field

The invention relates to the technical field of switching devices, in particular to a leakage protection system of a switching device and a circuit breaker.

Background

The earth leakage circuit breaker is widely used in the fields of industry, commerce, civil residence and the like, and can rapidly cut off a fault power supply in a specified extremely short time when the electric leakage occurs in a line, thereby protecting the safety of human bodies and electric equipment.

In the prior art, a leakage circuit breaker is generally provided with a test button and a test loop, and a leakage loop is newly added to test the effectiveness of tripping. However, the leakage protection and test structure of the residual current circuit breaker has many parts, complicated layout, high assembly difficulty and low compactness.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a leakage protection system and a circuit breaker for a switching device, which have a more compact structure, a smaller size, and a more reliable mechanism linkage.

In order to solve the above technical problem, the present invention provides a leakage protection system for a switching device, comprising:

the device comprises a shell, wherein a partition plate is arranged in the shell to divide an inner cavity of the shell into a first assembly cavity and a second assembly cavity which are arranged side by side, and an unlocking avoidance hole and a linkage avoidance hole are formed in the partition plate;

the L-pole circuit-breaking module is arranged in the first assembly cavity and comprises a handle pivoted on the shell, an L-pole movable contact frame pivoted on the shell in a resettable manner, a jump buckle pivoted on the L-pole movable contact frame and in linkage fit with the handle, and a lock catch pivoted on the L-pole movable contact frame in a resettable manner and in buckle fit with the jump buckle;

install in the earth leakage protection module of second assembly chamber, earth leakage protection module locates the unblock lever and the N utmost point movable contact frame of shell including the electric leakage release and the coaxial pivot of receiving the electric leakage signal, and the unblock lever is connected in the electric leakage release in order to be stimulateeed by the electric leakage release along length direction and the one side that is close to the electric leakage release, and the unblock lever has the unblock portion of horizontal extension along length direction and the one side of keeping away from the electric leakage release, and unblock portion wears to locate the hole is dodged in the unblock and with the hasp position cooperation, through wearing to locate between N utmost point movable contact frame and the L utmost point movable contact frame the linkage shaft in hole is dodged in the linkage links to each other with synchronous oscillation, links to each other through the link mechanism that resets between N utmost point movable contact frame and the unblock lever.

Preferably, the leakage release comprises a driving body and a pull rod extending out of the driving body, and the unlocking lever is provided with a clamping notch allowing the pull rod to be transversely clamped.

Preferably, the earth leakage protection module further comprises a zero sequence transformer, an L-pole line and an N-pole line penetrate through a through hole of the zero sequence transformer, and the zero sequence transformer is in communication connection with the earth leakage release.

Preferably, the earth leakage protection module still includes the electric leakage test system, and the electric leakage test system is including wearing to locate the electric leakage test return circuit of zero sequence transformer's through-hole and locating the test button of shell, and the electric leakage test return circuit is including opening and shutting the complex lead electrical pillar and electrically conductive torsional spring, leads electrical pillar and locates the shell, and the shell is located to electrically conductive torsional spring and the one end butt of electrically conductive torsional spring in test button.

Preferably, the leakage protection module further includes an N-pole fixed contact disposed on the housing, the N-pole movable contact frame includes an N-pole movable contact base frame and an N-pole movable contact pivotally disposed on the N-pole movable contact base frame in a resettable manner, the N-pole movable contact and the N-pole fixed contact both constitute a conductive element of the leakage test loop, the N-pole movable contact has a conductive abutting portion extending in a bending manner, and the conductive abutting portion is used for abutting against the other end of the conductive torsion spring.

Preferably, the N utmost point movable contact frame still includes the N utmost point reset torsion spring, has the hinge post and restricts the backstop portion that the N utmost point moving contact swung to the N utmost point static contact on the lateral wall of N utmost point movable contact bed frame, the N utmost point moving contact has the articulated ring of rotating the cover and locating the hinge post, and the one end joint of N utmost point reset torsion spring is in the N utmost point movable contact bed frame and the other end joint is in the N utmost point moving contact.

Preferably, the earth leakage protection module further includes an N-pole fixed contact disposed on the housing, the N-pole movable contact frame includes an N-pole movable contact base frame and an N-pole movable contact pivotally disposed on the N-pole movable contact base frame in a resettable manner, and the N-pole movable contact is matched with the N-pole fixed contact in position.

Preferably, the reset linkage mechanism includes a V-shaped transmission member, a reset abutting portion integrally formed on the N-pole moving contact frame, and a kidney-shaped hole opened in the unlocking lever, a vertex angle portion of the V-shaped transmission member is pivoted to the housing, a bifurcated end of the V-shaped transmission member abuts against the reset abutting portion, and the other bifurcated end of the V-shaped transmission member is provided with a slide pin located in the kidney-shaped hole.

Preferably, the outer shell comprises a middle shell, one side of the middle shell is provided with a first side cover plate, the other side of the middle shell is provided with a second side cover plate, the first side cover plate and the middle shell jointly define the first assembly cavity, and the second side cover plate and the middle shell jointly define the second assembly cavity.

Preferably, the L-pole moving contact frame comprises a swing base frame, an L-pole moving contact rod pivotally arranged on the swing base frame in a resettable manner, and an L-pole moving contact clamped on the L-pole moving contact rod.

The invention also provides a breaker, which comprises the leakage protection system of the switch electric appliance.

As described above, the leakage protection system and the circuit breaker of the switching device according to the present invention have the following advantages: in the invention, the unlocking lever is connected to the electric leakage release along the length direction and one side close to the electric leakage release, and the unlocking lever is provided with the transversely extending unlocking part along the length direction and one side far away from the electric leakage release; then, the unlocking lever is driven by the electric leakage release to rotate, and the unlocking part of the unlocking lever moves towards the direction of the lock catch; and then, the lock catch is separated from the jump buckle under the pushing of the unlocking part, so that the L-pole movable contact frame rotates to the original position, namely the L-pole movable contact frame is disconnected with the corresponding L-pole static contact. The N-pole movable contact frame is connected with the L-pole movable contact frame through a linkage shaft penetrating through the linkage avoiding hole, so that the N-pole movable contact frame rotates to an original position, namely the N-pole movable contact frame is disconnected with the corresponding N-pole fixed contact; the N-pole movable contact frame is connected with the unlocking lever through the reset linkage mechanism, and the unlocking lever also rotates to the original position. Therefore, the leakage protection system of the switch electric appliance is more compact in structure, smaller in size and more reliable in mechanism linkage.

Drawings

Fig. 1 is a schematic diagram of a case of a leakage protection system of a switching apparatus;

FIG. 2 is a schematic diagram of an L-pole disconnect module;

FIG. 3 is a schematic diagram of an earth leakage protection module;

FIG. 4 is a schematic view showing the connection between the L-pole moving contact frame and the N-pole moving contact frame;

FIG. 5 is an enlarged view of portion A of FIG. 4;

fig. 6 is a schematic connection diagram of the leakage release, the unlocking lever and the N-pole moving contact frame;

fig. 7 is a schematic connection diagram of the leakage test system, the N-pole moving contact frame and the N-pole fixed contact;

FIG. 8 is a first schematic view of the N-pole moving contact carrier;

fig. 9 shows a second schematic view of the N-pole moving contact carrier.

Description of the element reference numerals

1 outer cover

11 baffle plate

111 unlocking avoiding hole

112 linkage avoiding hole

12 first assembly chamber

13 second assembly chamber

14 middle shell

15 first side cover plate

16 second side cover plate

2L pole disconnection module

21 handle

22L pole moving contact frame

221 swing base frame

222L pole moving rod

223L pole moving contact

23 jump buckle

24 lock catch

25L pole wiring assembly

251 first L pole binding post

252 second L pole terminal

26L pole static contact

3 electric leakage protection module

31 leakage release

311 drive body

312 draw bar

32 unlocking lever

321 unlocking part

322 clamping gap

33N pole moving contact frame

331N pole movable contact base frame

331a hinge post

331b stopping part

332N pole moving contact

332a conductive abutment

332b hinge ring

333N pole reset torsion spring

34 linkage shaft

35 zero sequence mutual inductor

36 electric leakage test system

361 test button

362 conductive post

363 conductive torsion spring

37N pole static contact

38 reset linkage mechanism

381V type transmission piece

382 reset abutment

383 kidney-shaped hole

384 sliding pin

39N pole wiring assembly

391 first N-pole terminal

392 second N-pole terminal

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 6, the present invention provides a leakage protection system for a switching device, including:

the device comprises a shell 1, wherein a partition plate 11 is arranged in the shell 1 to divide an inner cavity of the shell 1 into a first assembly cavity 12 and a second assembly cavity 13 which are arranged side by side, and an unlocking avoidance hole 111 and a linkage avoidance hole 112 are formed in the partition plate 11;

the L-pole circuit breaking module 2 is installed in the first assembling cavity 12, and the L-pole circuit breaking module 2 comprises a handle 21 pivoted on the shell 1, an L-pole movable contact frame 22 pivoted on the shell 1 in a resettable manner, a jump buckle 23 pivoted on the L-pole movable contact frame 22 and in linkage fit with the handle 21, and a lock catch 24 pivoted on the L-pole movable contact frame 22 in a resettable manner and in buckle fit with the jump buckle 23;

the earth leakage protection module 3 is installed in the second assembly cavity 13, the earth leakage protection module 3 includes an earth leakage release 31 for receiving an earth leakage signal, and an unlocking lever 32 and an N-pole moving contact frame 33 coaxially pivoted to the housing 1, the unlocking lever 32 is connected to the earth leakage release 31 along the length direction and a side close to the earth leakage release 31 to be pulled by the earth leakage release 31, the unlocking lever 32 has an unlocking portion 321 extending transversely along the length direction and a side far away from the earth leakage release 31, the unlocking portion 321 is inserted into the unlocking avoiding hole 111 and is matched with the latch 24 in position, the N-pole moving contact frame 33 is connected with the L-pole moving contact frame 22 through a linkage shaft 34 inserted into the linkage avoiding hole 112 to swing synchronously, and the N-pole moving contact frame 33 is connected with the unlocking lever 32 through a reset linkage mechanism 38.

In the present invention, since the unlocking lever 32 is connected to the electrical leakage release 31 along the length direction and the side close to the electrical leakage release 31, and the unlocking lever 32 has the unlocking portion 321 extending transversely along the length direction and the side far from the electrical leakage release 31, the unlocking portion 321 is disposed through the unlocking avoiding hole 111 and is matched with the latch 24, when the circuit of any one of the L pole (live wire side) or the N pole (zero wire side) leaks electricity, firstly, the electrical leakage release 31 drives the unlocking lever 32 after receiving the electrical leakage signal; then, the unlocking lever 32 is driven by the leakage release 31 to rotate, and the unlocking part 321 of the unlocking lever 32 moves towards the lock catch 24; next, the latch 24 is separated from the jumper 23 by abutting against the unlocking portion 321, so that the L-pole moving contact frame 22 is rotated to the original position, that is, the L-pole moving contact frame 22 is disconnected from the corresponding L-pole fixed contact 26. Since the N-pole moving contact frame 33 is connected to the L-pole moving contact frame 22 through the linking shaft 34 penetrating through the linking avoiding hole 112, the N-pole moving contact frame 33 is rotated to the original position, that is, the N-pole moving contact frame 33 is disconnected from the corresponding N-pole fixed contact 37 (the leakage protection module 3 further includes the N-pole fixed contact 37 disposed on the housing 1); the N-pole moving frame 33 is connected with the unlocking lever 32 through a reset linkage mechanism 38, and the unlocking lever 32 also rotates to the original position. Therefore, the leakage protection system of the switch electric appliance is more compact in structure, smaller in size and more reliable in mechanism linkage.

As shown in fig. 6, in order to facilitate the electrical leakage release 31 to drive the unlocking lever 32 and to facilitate the electrical leakage release 31 to be disassembled and assembled and the unlocking lever 32 to be disassembled, the electrical leakage release 31 includes a driving body 311 and a pull rod 312 extending out of the driving body 311, and the unlocking lever 32 is provided with a locking notch 322 allowing the pull rod 312 to be laterally locked. More specifically, the pull rod 312 includes a straight rod portion and a hooking disk portion disposed at one end of the straight rod portion, and the hooking disk portion has a diameter larger than the clamping notch 322.

As shown in fig. 3, in order to enable the leakage release 31 to obtain a leakage signal in real time, the leakage protection module 3 further includes a zero sequence transformer 35 (the zero sequence transformer 35 is an existing component), an L-pole line and an N-pole line are inserted into a through hole of the zero sequence transformer 35, and the zero sequence transformer 35 is in communication connection with the leakage release 31.

As shown in fig. 5, in order to detect whether the leakage detection function of the switching device is normal, the leakage protection module 3 further includes a leakage test system 36, the leakage test system 36 includes a leakage test loop penetrating through the through hole of the zero sequence transformer 35 and a test button 361 disposed on the housing 1, the leakage test loop includes a conductive pillar 362 and a conductive torsion spring 363 in open-close fit, the conductive pillar 362 is disposed on the housing 1, the conductive torsion spring 363 is disposed on the housing 1, and one end of the conductive torsion spring 363 abuts against the test button 361. When the test button 361 is pressed, one end of the conductive torsion spring 363 contacts the conductive pillar 362 under the action of the test button 361, so that the leakage test loop is in a connected state.

As shown in fig. 7, 8 and 9, the N-pole moving contact frame 33 includes an N-pole moving contact base frame 331 and an N-pole moving contact 332 resettably pivoted to the N-pole moving contact base frame 331, both the N-pole moving contact 332 and the N-pole fixed contact 37 constitute the conductive element of the leakage test circuit, the N-pole moving contact 332 has a conductive abutting portion 332a extending in a bending manner, and the conductive abutting portion 332a is used for abutting against the other end of the conductive torsion spring 363. When the N-pole moving contact 332 is separated from the N-pole stationary contact 37, the conductive contact portion 332a does not contact the other end of the conductive torsion spring 363, so that the leakage test loop can be prevented from being burned out due to wrong wiring. When the N-pole moving contact 332 contacts the N-pole stationary contact 37, the conductive contact portion 332a contacts the other end of the conductive torsion spring 363.

Further, in order to realize the reset function of the N-pole moving contact 332, the N-pole moving contact frame 33 further includes an N-pole reset torsion spring 333, a hinge column 331a and a stop portion 331b for limiting the N-pole moving contact 332 to swing toward the N-pole fixed contact 37 are disposed on a side wall of the N-pole moving contact base frame 331, the N-pole moving contact 332 has a hinge ring 332b rotatably sleeved on the hinge column 331a, and one end of the N-pole reset torsion spring 333 is connected to the N-pole moving contact base frame 331 in a clamping manner and the other end of the N-pole reset torsion spring is connected to the N-pole moving contact 332 in a clamping manner. When the N-pole moving contact 332 abuts against the N-pole fixed contact 37, the N-pole moving contact 332 rotates at a small angle relative to the N-pole moving contact base frame 331, so that the flexible contact between the N-pole moving contact frame 33 and the N-pole fixed contact 37 is realized.

As shown in fig. 3 and fig. 6, in order to make the N-pole moving contact frame 33 flexibly contact with the N-pole fixed contact 37, the earth leakage protection module 3 further includes the N-pole fixed contact 37 disposed on the housing 1, the N-pole moving contact frame 33 includes an N-pole moving contact base frame 331 and an N-pole moving contact 332 pivotally disposed on the N-pole moving contact base frame 331 in a resettable manner, and the N-pole moving contact 332 is matched with the N-pole fixed contact 37 in position.

As shown in fig. 6, in order to make the structure of the reset linkage mechanism 38 more compact, the reset linkage mechanism 38 includes a V-shaped transmission member 381, a reset abutting portion 382 (see fig. 8 and 9 in particular) integrally formed on the N-pole movable contact frame 33, and a kidney-shaped hole 383 opened on the unlocking lever 32, wherein a vertex of the V-shaped transmission member 381 is pivoted to the housing 1, a bifurcated end of the V-shaped transmission member 381 abuts against the reset abutting portion 382, and the other bifurcated end of the V-shaped transmission member 381 is provided with a slide pin 384 located in the kidney-shaped hole 383.

As shown in fig. 2, in order to facilitate line connection, the L-pole disconnection module 2 further includes an L-pole wiring assembly 25, and the L-pole wiring assembly 25 includes a first L-pole wiring terminal 251 for connecting a power line and a second L-pole wiring terminal 251 for allowing access to electric equipment; the earth leakage protection module 3 further comprises an N-pole wiring assembly 39, wherein the N-pole wiring assembly 39 comprises a first N-pole wiring terminal 391 for connecting a neutral line and a second N-pole wiring terminal 392 for allowing an electric device to be accessed

As shown in fig. 1, in order to facilitate the assembly and disassembly of the earth leakage protection system, the housing 1 includes a middle casing 14, a first side cover 15 is disposed on one side of the middle casing 14, a second side cover 16 is disposed on the other side of the middle casing 14, the first side cover 15 and the middle casing 14 jointly define the first assembly cavity 12, and the second side cover 16 and the middle casing 14 jointly define the second assembly cavity 13.

As shown in fig. 2 and 4, in order to facilitate the flexible contact of the L-pole moving contact frame 22 with the L-pole fixed contact 26, the L-pole moving contact frame 22 includes a swing base frame 221, an L-pole moving contact bar 222 pivotally disposed on the swing base frame 221 in a resettable manner, and an L-pole moving contact 223 clamped on the L-pole moving contact bar 222.

The invention also provides a circuit breaker, which comprises the leakage protection system of the switch electric appliance.

In conclusion, the leakage protection system and the circuit breaker of the switching device are more compact in structure, smaller in size and more reliable in mechanism linkage. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. An earth leakage protection system for a switching device, comprising:

the device comprises a shell (1), wherein a partition plate (11) is arranged in the shell (1) to divide an inner cavity of the shell (1) into a first assembly cavity (12) and a second assembly cavity (13) which are arranged side by side, and an unlocking avoiding hole (111) and a linkage avoiding hole (112) are formed in the partition plate (11);

the L-pole circuit breaking module (2) is installed in the first assembling cavity (12), and the L-pole circuit breaking module (2) comprises a handle (21) pivoted to the shell (1), an L-pole movable contact frame (22) pivoted to the shell (1) in a resettable manner, a jump buckle (23) pivoted to the L-pole movable contact frame (22) and in linkage fit with the handle (21), and a lock catch (24) pivoted to the L-pole movable contact frame (22) in a resettable manner and in buckle fit with the jump buckle (23);

install in earth leakage protection module (3) of second assembly chamber (13), earth leakage protection module (3) are including earth leakage release (31) and coaxial pivot of receiving the earth leakage signal locate unblock lever (32) and the utmost point movable contact frame (33) of shell (1), unblock lever (32) are connected in earth leakage release (31) along length direction and the one side that is close to earth leakage release (31) in order to be drawed by earth leakage release (31), unblock lever (32) have transversely extending unblock portion (321) along length direction and the one side of keeping away from earth leakage release (31), unblock portion (321) wear to locate unblock dodge hole (111) and with hasp (24) position fit, link to each other through wearing to locate between utmost point movable contact frame (33) and the utmost point movable contact frame (22) the universal driving shaft (34) of linkage dodging hole (112) link to the synchronous oscillation, link to each other through resetting link mechanism (38) between utmost point movable contact frame (33) and unblock lever (32).

2. A leakage protection system for a switching device according to claim 1, wherein: the leakage tripper (31) comprises a driving body (311) and a pull rod (312) extending out of the driving body (311), and a clamping notch (322) allowing the pull rod (312) to be transversely clamped is formed in the unlocking lever (32).

3. A leakage protection system for a switching device according to claim 1, wherein: the electric leakage protection module (3) further comprises a zero sequence transformer (35), an L pole circuit and an N pole circuit are arranged in a through hole of the zero sequence transformer (35) in a penetrating mode, and the zero sequence transformer (35) is in communication connection with the electric leakage release (31).

4. A leakage protection system for a switching device according to claim 3, wherein: the leakage protection module (3) still includes electric leakage test system (36), and electric leakage test system (36) are including wearing to locate the electric leakage test circuit of the through-hole of zero sequence transformer (35) and locating test button (361) of shell (1), and the electric leakage test circuit is including opening and shutting complex conductive pillar (362) and electrically conductive torsional spring (363), and shell (1) is located in conductive pillar (362), and shell (1) and the one end butt of electrically conductive torsional spring (363) in test button (361) are located in electrically conductive torsional spring (363).

5. A leakage protection system of a switching device according to claim 4, wherein: the leakage protection module (3) further comprises an N-pole fixed contact (37) arranged on the shell (1), the N-pole movable contact frame (33) comprises an N-pole movable contact base frame (331) and an N-pole movable contact (332) which is arranged on the N-pole movable contact base frame (331) in a resetting pivoting mode, the N-pole movable contact (332) and the N-pole fixed contact (37) both form a conductive element of the leakage test loop, the N-pole movable contact (332) is provided with a conductive abutting part (332a) which extends in a bending mode, and the conductive abutting part (332a) is used for abutting against the other end of the conductive torsion spring (363).

6. A leakage protection system of a switching device according to claim 5, wherein: the N-pole movable contact frame (33) further comprises an N-pole reset torsion spring (333), a hinge column (331a) and a stopping portion (331b) limiting the N-pole movable contact (332) to swing to the N-pole fixed contact (37) are arranged on the side wall of the N-pole movable contact frame (331), the N-pole movable contact (332) is provided with a hinge ring (332b) rotatably sleeved on the hinge column (331a), and one end of the N-pole reset torsion spring (333) is clamped to the N-pole movable contact frame (331) and the other end of the N-pole reset torsion spring is clamped to the N-pole movable contact (332).

7. A leakage protection system for a switching device according to claim 1, wherein: the reset linkage mechanism (38) comprises a V-shaped transmission piece (381), a reset abutting part (382) integrally formed on the N-pole moving contact frame (33) and a waist-shaped hole (383) formed in the unlocking lever (32), wherein the vertex angle part of the V-shaped transmission piece (381) is pivoted to the shell (1), one forked end of the V-shaped transmission piece (381) abuts against the reset abutting part (382), and the other forked end of the V-shaped transmission piece (381) is provided with a sliding pin (384) located in the waist-shaped hole (383).

8. A leakage protection system for a switching device according to claim 1, wherein: the shell (1) comprises a middle shell (14), a first side cover plate (15) is arranged on one side of the middle shell (14), a second side cover plate (16) is arranged on the other side of the middle shell (14), the first side cover plate (15) and the middle shell (14) jointly define the first assembly cavity (12), and the second side cover plate (16) and the middle shell (14) jointly define the second assembly cavity (13).

9. A leakage protection system for a switching device according to claim 1, wherein: the L-pole moving contact frame (22) comprises a swinging base frame (221), an L-pole moving contact rod (222) which is pivoted on the swinging base frame (221) in a resettable mode, and an L-pole moving contact (223) which is clamped on the L-pole moving contact rod (222).

10. A circuit breaker, characterized by: a leakage protection system comprising a switching apparatus according to any one of claims 1 to 9.