Three-breakpoint earth leakage protection switch

Abstract

The invention relates to the technical field of electric leakage protection switches, and discloses a three-breakpoint electric leakage protection switch which comprises a base (1), a panel (2) matched with the base (1), an action mechanism (3), a sliding mechanism (4), a moving contact, a static contact and a PCBA board (5), a protruding shell (11) is arranged on the back of the base (1), the protruding shell (11) is provided with a containing cavity (12), a support cavity (13) used for installing a small support (32) is formed in the middle of the containing cavity (12), and the small support (32) is arranged in the support cavity (13). First buckles (14) are arranged on the two sides of the support cavity (13), and clamping grooves (321) matched with the first buckles (14) are formed in the small support (32) so that the small support (32) can be rapidly fixed. According to the leakage protection switch, the small support is assembled in a pressing mode, the problem that the technology for installing the small support through screws is tedious and unreliable is solved, and meanwhile the problem that the side plates deform due to stress is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage protection switches, and particularly to a three-breakpoint leakage protection switch. Background Art

[0002] With the increasing popularity of household appliances, people have more and more opportunities to come into contact with electricity, and there are frequent occurrences of electric shock casualties caused by failures of electrical equipment. For personal and equipment safety, leakage protection switches, as an effective electrical safety technology device, have been widely used. A leakage protection switch is applicable to quickly cut off the faulty power supply when exceeding the rated value to protect the safety of personnel and electrical equipment.

[0003] Existing leakage protection switches mainly use snap-fit cooperation between the rear cover and the base, and bolts are used to fix the inner bracket of the base. This is not only cumbersome to install, but also the side plates of the bosses are prone to deformation under stress. Improved technologies such as the leakage protection switch with an anti-deformation installation structure disclosed in the application number 202420886375.1 further include a buckle provided on the circumferential wall of the boss, a buckle plate provided on the rear cover and snap-fitted with the buckle; a reinforcing plate oppositely arranged with at least one of the buckles, and the strength is increased through the reinforcing plate to prevent difficult installation caused by deformation. However, the added reinforcing plate not only has a cumbersome production process, but also cannot completely solve the problem of side plate deformation under stress. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a three-breakpoint leakage protection switch. This leakage protection switch adopts a press-fit small bracket, which solves the problems of cumbersome and unreliable processes of installing the small bracket with screws, and at the same time solves the problem of side plate deformation under stress.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A three-breakpoint leakage protection switch includes a base, a panel cooperating with the base, an operating mechanism, a sliding mechanism, a moving contact, a static contact and a PCBA board. The operating mechanism includes a handle penetrating the panel, a small bracket rotatably connected to the handle, and a tripping buckle connected to the small bracket. The handle rotates relative to the small bracket, driving the tripping buckle to slide along the small bracket, thereby driving the sliding mechanism to drive the moving contact and the static contact to close.

[0007] A convex housing is provided on the back of the base. The convex housing is provided with a receiving cavity. A bracket cavity for installing the small bracket is provided in the middle of the receiving cavity. First buckles are provided on both sides of the bracket cavity, and a card slot matching the first buckles is provided on the small bracket to quickly fix the small bracket and achieve quick installation of the small bracket without screws.

[0008] Preferably, the moving contact includes a PE-pole moving contact, an L-pole moving contact and an N-pole moving contact, and the static contact includes a PE-pole static contact, an L-pole static contact and an N-pole static contact corresponding to the moving contact; the sliding mechanism includes a slider. On one side of the slider facing the PE-pole moving contact, there is a contact mounting seat. On the side of the contact mounting seat, there is a contact protrusion. On the PE-pole moving contact, there is a guide rail groove, and the contact protrusion slides in the guide rail groove to adjust the stroke range of the PE-pole moving contact.

[0009] Preferably, at both ends of the slider, there are respectively contact connection ends. One contact connection end faces the L-pole moving contact. On the L-pole moving contact, there is an L-pole contact point, and the L-pole contact point faces the L-pole static contact; the other contact connection end faces the N-pole moving contact. On the N-pole moving contact, there is an N-pole contact point, and the N-pole contact point faces the N-pole static contact;

[0010] Preferably, the PE-pole moving contact is U-shaped. The guide rail grooves are located on the two U-shaped side walls of the PE-pole moving contact. In the middle part of the U-shape of the PE-pole moving contact, there is a PE-pole contact point, and the PE-pole contact point faces the PE-pole static contact, so that when the slider slides to drive the contact mounting seat and the contact connection end, the PE-pole contact point is connected to the PE-pole static contact, the L-pole contact point is connected to the L-pole static contact, and the N-pole contact point is connected to the N-pole static contact in sequence.

[0011] Preferably, on one side of the handle facing the small bracket, there is a rotating seat. Along its length direction, the rotating seat is sequentially rotatably connected with a first rotating shaft and a U-shaped shaft. On both sides of the small bracket, there are long slots and first rotating holes. Both ends of the first rotating shaft are placed in the first rotating holes. One end of the U-shaped shaft away from the rotating seat penetrates through the long slot and the jump buckle. The handle rotates along the first rotating shaft to drive the U-shaped shaft to move along the length direction of the long slot, thereby driving the jump buckle to slide;

[0012] A first spring is arranged between the PE-pole contact point and the contact mounting seat, and second springs are respectively arranged between the L-pole moving contact and the N-pole moving contact and the base, so as to drive the slider, the L-pole moving contact and the N-pole moving contact to reset under the action of elastic force.

[0013] Preferably, the actuating mechanism further includes a lock catch. The lock catch is rotatably connected to the small bracket through a second rotating shaft. On the lock catch, there is an inclined lock plate corresponding to the jump buckle, and a buckle hole is arranged at the end of the lock catch;

[0014] The PCBA board includes a circuit board and two groups of mutual inductors located on the circuit board. The mutual inductors are welded by pins. A touch switch is arranged on the circuit board, and a test button facing the touch switch is arranged on the panel;

[0015] A moving iron core frame is arranged between the circuit board and the lock catch. A moving iron core slides in the moving iron core frame. A core seat is arranged at the top of the moving iron core. The moving iron core is snapped into the buckle hole and is resisted by the core seat.

[0016] Preferably, a fixed groove for installing a static contact is provided on the base. A square hole is provided on one side of the fixed groove for the static contact. The tab end of the static contact penetrates through the square hole and is connected to the first wiring frame.

[0017] Preferably, second buckles are provided at both ends of the fixed grooves for the static contacts on both sides, so that the L-pole static contact or the N-pole static contact can be fixed in the fixed groove for the static contact by being squeezed in and fixed by the second buckles.

[0018] A limiting groove is provided on the base. The limiting groove is located on both sides of the L-pole moving contact and the N-pole moving contact. Side convex portions are provided at both ends of the L-pole moving contact and the N-pole moving contact. The side convex portions slide in the limiting groove to limit the L-pole moving contact and the N-pole moving contact respectively.

[0019] A limiting plate is provided at the top of the limiting groove to limit the upward movement position of the side convex portion in the vertical direction of the limiting groove.

[0020] Preferably, a groove is provided at the bottom of the bracket cavity. The groove is arranged opposite to the fixed groove for the static contact located in the middle. The groove is used to place a PE wiring board for connecting with the incoming and outgoing wires of the PE pole.

[0021] A limiting protrusion is provided on one side of the small bracket facing the slider. A limiting groove is provided between the contact mounting seat and the contact connection end. The limiting protrusion extends into the limiting groove to limit the upper position of the slider.

[0022] Preferably, a lining plate is further included above the slider. Positioning posts are provided on both sides of the base. Through holes matching the positioning posts are provided on the lining plate for quickly installing the lining plate.

[0023] A limiting rotation hole is provided in the middle of the lining plate facing the small bracket. The first rotation shaft extends into the limiting rotation hole for limiting the small bracket and preventing the small bracket from swaying back and forth.

[0024] A raised portion is provided on the lining plate facing the contact connection end. An inner groove matching the contact connection end is provided in the raised portion to limit the installation height of the slider.

[0025] A baffle is provided on the lining plate facing the L-pole moving contact and the N-pole moving contact. The baffle extends to the tails of the L-pole moving contact and the N-pole moving contact for limiting the L-pole moving contact and the N-pole moving contact.

[0026] A notch is provided in the middle of the lining plate. An inclined plate is provided on one side of the notch. A PE-pole moving inclined plate matching the inclined plate is provided at one end of the PE-pole moving contact. The PE-pole moving inclined plate extends from the notch above the lining plate to facilitate the connection of the PE wire and at the same time play the role of insulating and arc-isolating the PE wire from the L wire and the N wire.

[0027] Preferably, a middle cover is further included. A third buckle is provided on the side of the raised housing. A card eye matching the third buckle is provided on the middle cover for quickly installing the middle cover and closing the accommodation cavity.

[0028] There are three groups of wire outlet slots at the bottom of the accommodation cavity. The three groups of wire outlet slots are successively provided with a PE wiring board, an L wiring board, and an N wiring board. The PE wiring board, the L wiring board, and the N wiring board are connected to the second wiring frame to facilitate the connection of the PE wire, the L wire, and the N wire.

[0029] Preferably, for the first outlet on the middle cover through which the handle passes, the second outlet through which the test button passes, and the screw hole, the screw fixes the wiring board to the second wiring frame through the screw hole;

[0030] There is a wire outlet hole at the bottom of the panel, and a wire pressing plate is arranged inside the wire outlet hole to ensure firm wiring.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] The leakage protection switch of the present invention adopts a press-fit small bracket, which solves the problems of cumbersome and unreliable process of installing the small bracket with screws. At the same time, it realizes the integrated design of the convex shell of the base, does not require the use of a rear cover, and effectively solves the problem of side plate stress deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the structural schematic diagram of the three-pole leakage protection switch Figure 1 .

[0034] Figure 2 is the structural schematic diagram of the three-pole leakage protection switch Figure 2 .

[0035] Figure 3 is the cross-sectional view of the three-pole leakage protection switch.

[0036] Figure 4 is the split structural schematic diagram of the three-pole leakage protection switch.

[0037] Figure 5 is the partial structural schematic diagram of the three-pole leakage protection switch.

[0038] Figure 6 is the structural schematic diagram of the base in the three-pole leakage protection switch.

[0039] Figure 7 is the top view of the base in the three-pole leakage protection switch.

[0040] Figure 8 is Figure 7 the cross-sectional view at the AA section.

[0041] Figure 9 is the structural schematic diagram of the operating mechanism and the sliding mechanism in the three-pole leakage protection switch.

[0042] Figure 10This is a schematic diagram of the split structure of the operating mechanism and the sliding mechanism in a three - breakpoint leakage protection switch.

[0043] Figure 11 This is a schematic diagram of the structure of the moving contact and the static contact in a three - breakpoint leakage protection switch.

[0044] Figure 12 This is a schematic diagram of the structure of the PCBA board in a three - breakpoint leakage protection switch.

[0045] Figure 13 This is a schematic diagram of the structure of the lining board in a three - breakpoint leakage protection switch.

[0046] Figure 14 This is a schematic diagram of the structure of the middle cover in a three - breakpoint leakage protection switch.

[0047] In the attached drawings: 1 - base, 11 - raised housing, 111 - third buckle, 12 - accommodation cavity, 121 - wire outlet slot, 13 - bracket cavity, 14 - first buckle, 15 - static contact fixing groove, 151 - second buckle, 16 - square hole, 17 - limit groove, 171 - limit plate, 18 - groove, 19 - positioning post, 2 - panel, 21 - wire outlet hole, 22 - pressure plate, 3 - operating mechanism, 31 - handle, 311 - rotating seat, 312 - first rotating shaft, 313 - U - shaped shaft, 314 - second rotating shaft, 32 - small bracket, 321 - card slot, 322 - long slot, 323 - first rotating hole, 324 - limit projection, 33 - jump buckle, 34 - lock buckle, 341 - inclined locking plate, 342 - buckle hole, 4 - sliding mechanism, 41 - slider, 42 - contact mounting seat, 421 - contact projection, 43 - contact connection end, 44 - limit groove, 5 - PCBA board, 51 - circuit board, 52 - mutual inductor, 53 - tactile switch, 54 - test button, 55 - moving iron core frame, 56 - moving iron core, 57 - core seat, 61 - PE - pole moving contact, 611 - guide rail groove, 612 - PE - pole contact, 613 - PE - pole moving inclined plate, 62 - L - pole moving contact, 621 - L - pole contact, 63 - N - pole moving contact, 631 - N - pole contact, (622, 632) - side projection, 64 - first spring, 71 - PE - pole static contact, 72 - L - pole static contact, 73 - N - pole static contact, 8 - lining board, 81 - through hole, 82 - limit rotation hole, 83 - raised part, 84 - baffle, 85 - notch, 851 - inclined plate, 9 - middle cover, 91 - eyelet, 92 - first outlet, 93 - second outlet, 94 - screw hole, 10 - first wiring frame, 20 - second wiring frame. Detailed implementation mode

[0048] Embodiment 1: A preferred embodiment of the present invention provides a three - break leakage protection switch, which includes a base 1, a panel 2 that cooperates with the base 1, an operating mechanism 3, a sliding mechanism 4, a moving contact, a static contact, and a PCBA board 5. The operating mechanism 3 includes a handle 31 that penetrates the panel 2, a small bracket 32 rotatably connected to the handle 31, and a tripping buckle 33 connected to the small bracket 32. The handle 31 rotates relative to the small bracket 32, driving the tripping buckle 33 to slide along the small bracket 32, thereby driving the sliding mechanism 4 to drive the moving contact and the static contact to close.

[0049] The base 1 is provided with a convex housing 11 on the back. The convex housing 11 is provided with a receiving cavity 12. In the middle of the receiving cavity 12, there is a bracket cavity 13 for installing the small bracket 32. On both sides of the bracket cavity 13, there are first buckles 14. The small bracket 32 is provided with a slot 321 that matches the first buckles 14 to quickly fix the small bracket 32 and achieve screw - free and quick installation of the small bracket 32.

[0050] Embodiment 2: A preferred embodiment of the present invention provides a three - break leakage protection switch, which is only different from the above - mentioned embodiment in that: the moving contact includes a PE - pole moving contact 61, an L - pole moving contact 62, and an N - pole moving contact 63, and the static contact includes a PE - pole static contact 71, an L - pole static contact 72, and an N - pole static contact 73 corresponding to the moving contact; the sliding mechanism 4 includes a slider 41. On one side of the slider 41 facing the PE - pole moving contact 61, there is a contact mounting seat 42. On the side of the contact mounting seat 42, there is a contact protrusion 421. The PE - pole moving contact 61 is provided with a guide rail groove 611, and the contact protrusion 421 slides in the guide rail groove 611 to adjust the stroke range of the PE - pole moving contact 61.

[0051] Both ends of the slider 41 are respectively provided with contact connection ends 43. One contact connection end 43 faces the L - pole moving contact 62. The L - pole moving contact 62 is provided with an L - pole contact 621, and the L - pole contact 621 faces the L - pole static contact 72; the other contact connection end 43 faces the N - pole moving contact 63. The N - pole moving contact 63 is provided with an N - pole contact 631, and the N - pole contact 631 faces the N - pole static contact 73;

[0052] The PE - pole moving contact 61 is U - shaped. The guide rail groove 611 is located on the two U - shaped side walls of the PE - pole moving contact 61. In the middle part of the U - shape of the PE - pole moving contact 61, there is a PE - pole contact 612, and the PE - pole contact 612 faces the PE - pole static contact 71, so that when the slider 41 slides to drive the contact mounting seat 42 and the contact connection ends 43, the PE - pole contact 612 is connected to the PE - pole static contact 71, the L - pole contact 621 is connected to the L - pole static contact 72, and the N - pole contact 631 is connected to the N - pole static contact 73 in sequence.

[0053] Embodiment 3: A preferred embodiment of the present invention provides a three-breakpoint leakage protection switch, which is only different from the above embodiment in that: a rotating seat 311 is provided on one side of the handle 31 facing the small bracket 32. The rotating seat 311 is sequentially rotatably connected with a first rotating shaft 312 and a U-shaped shaft 313 along its length direction. Long strip grooves 322 and first rotating holes 323 are provided on both sides of the small bracket 32. Both ends of the first rotating shaft 312 are placed in the first rotating holes 323. One end of the U-shaped shaft 313 away from the rotating seat 311 penetrates through the long strip groove 322 and the trip latch 33. The handle 31 rotates along the first rotating shaft 312 to drive the U-shaped shaft 313 to move along the length direction of the long strip groove 322, thereby driving the trip latch 33 to slide;

[0054] The handle 31 includes a closing position when the moving contact and the static contact are in electrical contact and a tripping position when the moving contact and the static contact are electrically disconnected; the trip latch 33 is used to apply force to the slider 41 when the handle 31 is in the tripping position and make the moving contact and the static contact contact through the slider 41; a first spring 64 is provided between the PE pole contact 612 and the contact mounting seat 42, and second springs are respectively provided between the L pole moving contact 62 and the N pole moving contact 63 and the base 1 to drive the slider 41, the L pole moving contact 62 and the N pole moving contact 63 to reset under the action of elastic force.

[0055] That is, when the handle 31 is pulled upward, the U-shaped shaft 313 drives the trip latch 33, the slider 41 and the moving contact to move toward the static contact along the long strip groove 322, realizing three-breakpoint closing; conversely, if the handle 31 is pulled downward, the U-shaped shaft 313 drives the trip latch 33 to move in the direction away from the static contact along the long strip groove 322, realizing three-breakpoint tripping.

[0056] Embodiment 4: A preferred embodiment of the present invention provides a three-breakpoint leakage protection switch, which is only different from the above embodiment in that: the actuating mechanism 3 further includes a locking latch 34. The locking latch 34 is rotatably connected to the small bracket 32 through a second rotating shaft 314. An inclined locking plate 341 corresponding to the trip latch 33 is provided on the locking latch 34, and a locking hole 342 is provided at the end of the locking latch 34;

[0057] The PCBA board 5 includes a circuit board 51 and two groups of current transformers 52 located on the circuit board 51. The current transformers 52 are welded by pins. A touch switch 53 is provided on the circuit board 51, and a test button 54 facing the touch switch 53 is provided on the panel 2; a moving iron core frame 55 is provided between the circuit board 51 and the locking latch 34. A moving iron core 56 is slidably provided in the moving iron core frame 55. A core seat 57 is provided at the top of the moving iron core 56. The moving iron core 56 is snapped into the locking hole 342 and resisted by the core seat 57; adopting a double-current-transformer structure, the data reliability is improved through cross-verification, and the measurement, protection or control functions for more complex circuits are realized.

[0058] The locking latch 34 is used to lock the jumping latch 33, putting the jumping latch 33 in the state of the force-applying slider 41; the moving iron core 56 and the moving iron core frame 55 cooperate to drive the locking latch 34 away from the jumping latch 33 when there is a leakage; the locking latch 34 is latched or unlatched with the jumping latch 33 through the inclined locking plate 341. The locking latch 34 and the jumping latch 33 form a linkage body in the latched state. When overload or short circuit occurs, the moving iron core 56 drives the locking latch 34 to unlatch the locking latch 34 from the jumping latch 33, and the switch trips. The inclined surface design of the inclined locking plate 341 can effectively reduce the tripping force of the switch, making the switch more stable and effectively solving the action reliability of the switch at low voltage (power supply voltage failure).

[0059] Embodiment 5: A preferred embodiment of the present invention provides a three-breakpoint leakage protection switch, which is only different from the above embodiment in that: a static contact fixing groove 15 for installing a static contact is provided on the base 1, a square hole 16 is provided on one side of the static contact fixing groove 15, and the tab end of the static contact penetrates through the square hole 16 and is connected to the first wiring frame 10; second buckles 151 are provided at both ends of the static contact fixing grooves 15 on both sides to fix the L-pole static contact 72 or the N-pole static contact 73 in the static contact fixing groove 15 by extrusion;

[0060] A limiting groove 17 is provided on the base 1, and the limiting groove 17 is located on both sides of the L-pole moving contact 62 and the N-pole moving contact 63. Side position protruding parts 622 and 632 are provided at both ends of the L-pole moving contact 62 and the N-pole moving contact 63, and the side position protruding parts 622 and 632 slide in the limiting groove 17 to limit the L-pole moving contact 62 and the N-pole moving contact 63 respectively;

[0061] A limiting plate 171 is provided at the top of the limiting groove 17 to limit the upward movement position of the side position protruding parts 622 and 632 in the vertical direction of the limiting groove 17.

[0062] Embodiment 6: A preferred embodiment of the present invention provides a three-breakpoint leakage protection switch, which is only different from the above embodiment in that: a groove 18 is provided at the bottom of the support cavity 13, and the groove 18 is arranged opposite to the static contact fixing groove 15 in the middle. The groove 18 is used to place the PE wiring board for connecting with the PE-pole incoming and outgoing wires;

[0063] A limiting protrusion 324 is provided on the side of the small support 32 facing the slider 41, and a limiting groove 44 is provided between the contact mounting seat 42 and the contact connection end 43. The limiting protrusion 324 extends into the limiting groove 44 to limit the upper position of the slider 41.

[0064] Embodiment 7: A preferred embodiment of the present invention provides a three - break leakage protection switch, the difference from the above - mentioned embodiment being only that: it further includes a lining plate 8 above the slider 41. Positioning posts 19 are provided on both sides of the base 1, and through - holes 81 matching the positioning posts 19 are provided on the lining plate 8 for quickly installing the lining plate 8; a limiting rotation hole 82 is provided in the middle of the lining plate 8 facing the small bracket 32, and the first rotating shaft 312 extends into the limiting rotation hole 82 for limiting the small bracket 32 and preventing the small bracket 32 from swaying back and forth;

[0065] A raised portion 83 is provided on the lining plate 8 facing the contact connection end 43, and an inner groove matching the contact connection end 43 is provided in the raised portion 83 to limit the installation height of the slider 41;

[0066] A baffle 84 is provided on the lining plate 8 facing the L - pole moving contact 62 and the N - pole moving contact 63, and the baffle 84 extends to the tails of the L - pole moving contact 62 and the N - pole moving contact 63 for limiting the L - pole moving contact 62 and the N - pole moving contact 63;

[0067] A notch 85 is provided in the middle of the lining plate 8, an inclined plate 851 is provided on one side of the notch 85, and a PE - pole moving inclined plate 613 matching the inclined plate 851 is provided at one end of the PE - pole moving contact 61. The PE - pole moving inclined plate 613 extends from the notch 85 above the lining plate 8 to facilitate the connection of the PE wire and at the same time play an insulating and arc - isolating role between the PE wire and the L wire and the N wire.

[0068] Embodiment 8: A preferred embodiment of the present invention provides a three - break leakage protection switch, the difference from the above - mentioned embodiment being only that: it further includes a middle cover 9. A third buckle 111 is provided on the side of the convex housing 11, and a card eye 91 matching the third buckle 111 is provided on the middle cover 9 for quickly installing the middle cover 9 and closing the accommodation cavity 12; there may be sparks during opening, and with the two - layer protection of the panel 2 and the middle cover 9, it is safer to use.

[0069] Three groups of wire - outlet slots 121 are provided at the bottom of the accommodation cavity 12. A PE wiring board, an L wiring board, and an N wiring board are successively provided in the three groups of wire - outlet slots 121, and the PE wiring board, the L wiring board, and the N wiring board are connected to the second wiring frame 20 to facilitate the connection of the PE wire, the L wire, and the N wire.

[0070] A first outlet 92 for the handle 31 to pass through, a second outlet 93 for the test button 54 to pass through, and screw holes 94 are provided on the middle cover 9. Screws are used to fix the wiring board to the second wiring frame 20 through the screw holes 94; an outlet hole 21 is provided at the bottom of the panel 2, and a wire - pressing plate 22 is provided inside the outlet hole 21 to ensure firm wiring.

[0071] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any person skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. Three-breakpoint leakage protection switch, comprising a base (1), a panel (2) cooperating with the base (1), an operating mechanism (3), a sliding mechanism (4), a moving contact, a static contact and a PCBA board (5), characterized in that, The actuating mechanism (3) includes a handle (31) passing through the panel (2), a small bracket (32) rotatably connected to the handle (31), and a jumping buckle (33) connected to the small bracket (32). The handle (31) rotates relative to the small bracket (32), driving the jumping buckle (33) to slide along the small bracket (32), thereby driving the sliding mechanism (4) to drive the moving contact to close with the static contact. The base (1) is provided with a convex housing (11) on the back. The convex housing (11) is provided with a receiving cavity (12). A bracket cavity (13) for installing the small bracket (32) is provided in the middle of the receiving cavity (12). First buckles (14) are provided on both sides of the bracket cavity (13). A slot (321) matching the first buckle (14) is provided on the small bracket (32) to quickly fix the small bracket (32) and achieve quick installation of the small bracket (32) without screws.

2. The three-breakpoint leakage protection switch according to claim 1, wherein, The moving contact includes a PE-pole moving contact (61), an L-pole moving contact (62), and an N-pole moving contact (63). The static contact includes a PE-pole static contact (71), an L-pole static contact (72), and an N-pole static contact (73) corresponding to the moving contact. The sliding mechanism (4) includes a slider (41). A contact mounting seat (42) is provided on one side of the slider (41) facing the PE-pole moving contact (61). A contact protrusion (421) is provided on the side of the contact mounting seat (42). A guide rail groove (611) is provided on the PE-pole moving contact (61). The contact protrusion (421) slides in the guide rail groove (611) to adjust the stroke range of the PE-pole moving contact (61).

3. The three-breakpoint leakage protection switch according to claim 2, characterized in that, Contact connection ends (43) are respectively provided at both ends of the slider (41). One contact connection end (43) faces the L-pole moving contact (62). An L-pole contact (621) is provided on the L-pole moving contact (62). The L-pole contact (621) faces the L-pole static contact (72). The other contact connection end (43) faces the N-pole moving contact (63). An N-pole contact (631) is provided on the N-pole moving contact (63). The N-pole contact (631) faces the N-pole static contact (73). Preferably, the PE-pole moving contact (61) is U-shaped. The guide rail grooves (611) are located on the two U-shaped side walls of the PE-pole moving contact (61). A PE-pole contact (612) is provided in the middle of the U-shape of the PE-pole moving contact (61). The PE-pole contact (612) faces the PE-pole static contact (71). When the slider (41) slides to drive the contact mounting seat (42) and the contact connection end (43), the PE-pole contact (612) is connected to the PE-pole static contact (71), the L-pole contact (621) is connected to the L-pole static contact (72), and the N-pole contact (631) is connected to the N-pole static contact (73) in sequence.

4. The three-breakpoint leakage protection switch according to claim 2 or 3, characterized in that, On the side of the handle (31) facing the small bracket (32), there is a rotating seat (311). Along its length direction, the rotating seat (311) is successively rotationally connected with a first rotating shaft (312) and a U-shaped shaft (313). On both sides of the small bracket (32), there are long slots (322) and first rotating holes (323). Both ends of the first rotating shaft (312) are placed in the first rotating holes (323). One end of the U-shaped shaft (313) away from the rotating seat (311) penetrates through the long slot (322) and the jump buckle (33). The handle (31) rotates along the first rotating shaft (312) to drive the U-shaped shaft (313) to move along the length direction of the long slot (322), thereby driving the jump buckle (33) to slide; There is a first spring (64) between the PE pole contact (612) and the contact mounting seat (42). There are second springs between the L pole moving contact (62) and the N pole moving contact (63) and the base (1) respectively, so as to drive the slider (41), the L pole moving contact (62) and the N pole moving contact (63) to reset under the action of elastic force.

5. The three-breakpoint leakage protection switch according to claim 4, characterized in that, The action mechanism (3) further includes a lock catch (34). The lock catch (34) is rotationally connected with the small bracket (32) through a second rotating shaft (314). There is an inclined lock plate (341) corresponding to the jump buckle (33) on the lock catch (34), and a buckle hole (342) is provided at the end of the lock catch (34); The PCBA board (5) includes a circuit board (51) and two groups of current transformers (52) located on the circuit board (51). The current transformers (52) are welded by inserting pins. There is a touch switch (53) on the circuit board (51), and a test button (54) facing the touch switch (53) is provided on the panel (2); There is a moving iron core frame (55) between the circuit board (51) and the lock catch (34). A moving iron core (56) slides in the moving iron core frame (55). There is a core seat (57) at the top of the moving iron core (56). The moving iron core (56) is snapped into the buckle hole (342) and is resisted by the core seat (57).

6. The three-breakpoint leakage protection switch according to claim 4, characterized in that, On the base (1), there is a static contact fixing groove (15) for installing static contacts. One side of the static contact fixing groove (15) is provided with a square hole (16). The tab end of the static contact penetrates through the square hole (16) and is connected to the first wiring frame (10); Preferably, second buckles (151) are provided on the side walls of the static contact fixing grooves (15) on both sides, so as to fix the L pole static contact (72) or the N pole static contact (73) in the static contact fixing groove (15) by extrusion and be fixed by the second buckles (151); On the base (1), there is a limit groove (17). The limit groove (17) is located on both sides of the L pole moving contact (62) and the N pole moving contact (63). Side position convex portions (622, 632) are provided at both ends of the L pole moving contact (62) and the N pole moving contact (63). The side position convex portions (622, 632) slide in the limit groove (17) to respectively limit the L pole moving contact (62) and the N pole moving contact (63); A limit plate (171) is provided at the top of the limit groove (17) to limit the upward movement position of the side position convex portions (622, 632) in the vertical direction of the limit groove (17).

7. The three-breakpoint leakage protection switch according to claim 4 or 5 or 6, characterized in that, A groove (18) is provided at the bottom of the bracket cavity (13). The groove (18) is disposed opposite to the static contact fixing groove (15) located in the middle. The groove (18) is used to place a PE wiring board for connecting with the incoming and outgoing wires of the PE pole. A limiting protrusion (324) is provided on one side of the small bracket (32) facing the slider (41). A limiting groove (44) is provided between the contact mounting seat (42) and the contact connection end (43). The limiting protrusion (324) extends into the limiting groove (44) to limit the upper position of the slider (41).

8. The three-breakpoint leakage protection switch according to claim 7, characterized in that, It further includes a lining plate (8) located above the slider (41). Positioning posts (19) are provided on both sides of the base (1). Through holes (81) matching the positioning posts (19) are provided on the lining plate (8) for quickly installing the lining plate (8). A limiting rotation hole (82) is provided in the middle of the lining plate (8) facing the small bracket (32). The first rotating shaft (312) extends into the limiting rotation hole (82) for limiting the small bracket (32) and preventing the small bracket (32) from swaying back and forth. A raised portion (83) is provided on the lining plate (8) facing the contact connection end (43). An inner groove matching the contact connection end (43) is provided in the raised portion (83) to limit the installation height of the slider (41). A baffle (84) is provided on the lining plate (8) facing the L-pole moving contact (62) and the N-pole moving contact (63). The baffle (84) extends to the tails of the L-pole moving contact (62) and the N-pole moving contact (63) for limiting the L-pole moving contact (62) and the N-pole moving contact (63). A notch (85) is provided in the middle of the lining plate (8). An inclined plate (851) is provided on one side of the notch (85). One end of the PE-pole moving contact (61) is provided with a PE-pole moving inclined plate (613) matching the inclined plate (851). The PE-pole moving inclined plate (613) extends from the notch (85) above the lining plate (8) to facilitate the connection of the PE wire and at the same time play the role of insulating and arc-isolating the PE wire from the L wire and the N wire.

9. The three-breakpoint leakage protection switch according to claim 8, characterized in that, It further includes a middle cover (9). A third buckle (111) is provided on the side of the convex housing (11). A card hole (91) matching the third buckle (111) is provided on the middle cover (9) for quickly installing the middle cover (9) and closing the accommodation cavity (12). Three groups of wire outlet slots (121) are provided at the bottom of the accommodation cavity (12). A PE wiring board, an L wiring board, and an N wiring board are successively provided in the three groups of wire outlet slots (121). The PE wiring board, the L wiring board, and the N wiring board are connected to the second wiring frame (20) to facilitate the connection of the PE wire, the L wire, and the N wire.

10. The three-breakpoint leakage protection switch according to claim 9, characterized in that, A first outlet (92) for the handle (31) to pass through, a second outlet (93) for the test button (54) to pass through, and a screw hole (94) are provided on the middle cover (9). Screws are used to fix the wiring board to the second wiring frame (20) through the screw hole (94). An outlet hole (21) is provided at the bottom of the panel (2). A wire pressing plate (22) is provided inside the outlet hole (21) to ensure firm wiring.

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