Residual current operated circuit breaker

Abstract

A residual current operated circuit breaker comprises a shell, a residual current module, an L-pole unit and an N-pole unit, and the residual current module comprises an electronic component board, a zero sequence mutual inductor and a residual current operated release. The N-pole unit comprises a first N-pole wiring terminal, an N-pole moving contact, an N-pole static contact, a second N-pole wiring terminal, an N-pole operating mechanism and an N-pole short-circuit protection device. According to the residual current operated circuit breaker, the N-pole internal compact structure and reasonable layout are adopted, and the N-pole operating mechanism is obliquely arranged above and on the right side of the residual current operated tripper and above the N-pole moving contact, so that enough space is reserved below the residual current operated tripper and between the second N-pole wiring terminal and the N-pole static contact; the N pole can be provided with an electronic component board, a residual current action release and at least part of a zero sequence mutual inductor, and can also be provided with a short-circuit protection device and an operating mechanism, so that short-circuit protection is realized, and the reliability of closed contact of the N pole contact is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage apparatus, concretely relates to a residual current operating circuit breaker. BACKGROUND

[0002] The existing residual current operating circuit breaker is composed of a current protection pole (also called L pole) and a non-protected neutral pole (also called N pole), and the residual current operating module is placed in the neutral pole, which results in a compact space in the neutral pole and makes it impossible to place the electromagnetic release, arc extinguishing device and independent operating mechanism, leading to poor stability of the contact closing contact, and the product does not have short-circuit protection and arc extinguishing function, affecting the service life of the product. SUMMARY

[0003] The utility model aims at overcoming at least one defect of the prior art and providing a residual current operating circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The residual current operating circuit breaker comprises a shell, a residual current module and L pole units and N pole units arranged along a first direction, the shell is provided with a first chamber and a second chamber, the N pole units are installed in the first chamber, and the L pole units are installed in the second chamber; the residual current module comprises an electronic component board, a zero sequence transformer and a residual current operating release, and the zero sequence transformer and the residual current operating release are electrically connected with the electronic component board respectively;

[0006] The N pole units comprise a first N pole terminal, an N pole moving contact, an N pole static contact and a second N pole terminal arranged along a second direction in sequence, the N pole units further comprise an N pole operating mechanism and an N pole short-circuit protection device, the N pole short-circuit protection device and the residual current operating release are arranged in the first chamber along a third direction in sequence, and the N pole short-circuit protection device and the residual current operating release are located between the second N pole terminal and the N pole static contact in the second direction, the N pole operating mechanism is obliquely arranged, one end of the N pole operating mechanism is located on the side, away from the N pole short-circuit protection device, of the residual current operating release in the third direction, the other end of the N pole operating mechanism is located on the side, away from the second N pole terminal, of the residual current operating release in the second direction, and the other end of the N pole operating mechanism is connected with the N pole moving contact;

[0007] The first N-pole terminal is electrically connected with an N-pole moving contact, the N-pole short-circuit protection device is electrically connected between a second N-pole terminal and an N-pole static contact, the second N-pole terminal is electrically connected with the N-pole short-circuit protection device through a second conductive structure, and the second conductive structure passes through an axial hole of the zero sequence transformer; the N-pole short-circuit protection device and the residual current operating release are respectively used for driving an N-pole operating mechanism to be unlocked and tripped.

[0008] The first direction, the second direction and the third direction are perpendicular to each other.

[0009] Optionally, the N-pole unit further comprises an N-pole arc-extinguishing chamber, the N-pole arc-extinguishing chamber is located between the first N-pole terminal and the N-pole static contact in the second direction, and the N-pole arc-extinguishing chamber is located on a side of the N-pole moving contact away from the N-pole operating mechanism in the third direction.

[0010] Optionally, further comprising an insulating partition plate, the insulating partition plate is located on a side of the N-pole moving contact, the N-pole static contact and the N-pole arc-extinguishing chamber in the first direction, wherein the N-pole arc-extinguishing chamber is directly placed on the insulating partition plate, and at least one limiting rib is protruded on the insulating partition plate and used for limiting the N-pole arc-extinguishing chamber.

[0011] Optionally, a side of the N-pole arc-extinguishing chamber close to the N-pole moving contact is inclined to a direction away from the first N-pole terminal and close to the N-pole static contact.

[0012] Optionally, the shell is provided with a through hole for communicating the first chamber and the second chamber, the zero sequence transformer is arranged along the second direction, a part of the zero sequence transformer is located in the first chamber, another part of the zero sequence transformer is located between the N-pole short-circuit protection device and the second N-pole terminal in the second direction, and the other part of the zero sequence transformer passes through the through hole and extends into the second chamber.

[0013] Optionally, the electronic component board is arranged in the first chamber and between the first N-pole terminal and the zero sequence transformer along the second direction, one end of the electronic component board is located on a side of the N-pole moving contact and the N-pole static contact in the first direction, and the other end of the electronic component board is located on a side of the N-pole short-circuit protection device away from the residual current operating release.

[0014] Optionally, the second conductive structure is a second wiring board, the second wiring board comprises a connecting segment and a wiring segment connected in sequence along the second direction, the wiring segment is inserted into the second N-pole terminal, the connecting segment passes through the axial hole of the zero sequence transformer and is located on a side of the N-pole short-circuit protection device away from the residual current operating release in the third direction, and the connecting segment is electrically connected with the N-pole short-circuit protection device.

[0015] Optionally, the shell comprises an L pole cover, a base and an N pole cover arranged in sequence along a first direction, wherein the N pole cover covers one side of the base to form the first cavity, the L pole cover covers the other side of the base to form the second cavity, and the L pole cover is provided with a support frame protruding in the first direction.

[0016] Optionally, the L pole unit comprises a first L pole terminal, an L pole moving contact, an L pole static contact, an L pole arc extinguishing chamber, a second L pole terminal and an L pole short circuit protection device, which are arranged in sequence along a second direction, and the L pole arc extinguishing chamber is further arranged with the L pole short circuit protection device along a third direction.

[0017] The first L pole terminal is electrically connected with the L pole moving contact, the second L pole terminal is electrically connected with the L pole short circuit protection device through a third conductive structure, and the third conductive structure passes through the axial hole of the zero sequence transformer.

[0018] Optionally, the third conductive structure comprises a fourth terminal plate and a second wire, one end of the fourth terminal plate is inserted into the second L pole terminal, the other end of the fourth terminal plate is provided with a terminal part extending in the first direction, the terminal part extends into the through hole, one end of the second wire is connected to the terminal part, and the other end of the second wire passes through the axial hole of the zero sequence transformer and is electrically connected with the L pole short circuit protection device.

[0019] Optionally, one side of the L pole arc extinguishing chamber facing the second L pole terminal is in a stepped structure, a gap formed by the stepped structure and the second L pole terminal forms an accommodation space for accommodating the zero sequence transformer.

[0020] The L pole arc extinguishing chamber comprises a plurality of first arc extinguishing fins and a plurality of second arc extinguishing fins, the first arc extinguishing fins and the second arc extinguishing fins are arranged in a spaced manner along the third direction, and the second arc extinguishing fins are shorter than the first arc extinguishing fins to form the stepped structure.

[0021] Optionally, one end of the N pole operating mechanism is provided with an N pole handle; the L pole unit further comprises an L pole operating mechanism, the L pole operating mechanism is arranged obliquely, one end of the L pole operating mechanism is located on the side of the L pole short circuit protection device away from the L pole arc extinguishing chamber in the third direction, the other end of the L pole operating mechanism is connected with the L pole moving contact, one end of the L pole operating mechanism is provided with an L pole handle, the L pole handle and the N pole handle are synchronously linked through a linkage, and the two ends of the linkage are connected with the L pole handle and the N pole handle respectively.

[0022] Optionally, the residual current module further comprises a test device, the test device comprising a test button and a conductive elastic member, the test button being slidingly arranged on the housing at a side of the N-pole operating mechanism away from the residual current operating mechanism, and the test button being movable between an initial position and a test position, the test button being capable of driving the conductive elastic member to conduct the electronic component board and the first N-pole terminal when the test button is moved from the initial position to the test position; the conductive elastic member being used to drive the test button to reset from the test position to the initial position.

[0023] Optionally, the N-pole short-circuit protection device comprises a coil former provided with a mounting through cavity, a coil electrically connected between the N-pole static contact and the second N-pole terminal, a static iron core and a dynamic iron core oppositely arranged in the mounting through cavity of the coil former, a dynamic iron core spring arranged between the static iron core and the dynamic iron core and used to drive the dynamic iron core to reset, and a top rod in synchronous linkage with the dynamic iron core and used to drive the N-pole operating mechanism to unlock and trip; the coil former is a square column structure, and the coil is a spiral structure sleeved on the coil former, a spiral center of the spiral structure being arranged along a length direction of the coil former, and a cross section of the spiral center in a vertical direction being square.

[0024] Optionally, the N-pole operating mechanism comprises an unlocking member used to unlock and trip the N-pole operating mechanism, one end of the top rod being provided with a pushing portion extending along a third direction, the unlocking member being provided with an unlocking member elongated end opposite to the pushing portion, and the pushing portion being capable of pushing the unlocking member elongated end to drive the unlocking member to unlock and trip the N-pole operating mechanism.

[0025] Optionally, the mounting through cavity is a square through hole penetrating through the coil former along a second direction; the dynamic iron core comprises a dynamic iron core body, the dynamic iron core body being a square block structure matched with the mounting through cavity, and the dynamic iron core body being slidingly arranged in the mounting through cavity along the second direction; the static iron core comprises a static iron core body, the static iron core body being a square block structure matched with the mounting through cavity, and the static iron core body being fixed in the mounting through cavity.

[0026] Optionally, the L-pole unit comprises an L-pole operating mechanism, the L-pole operating mechanism and the N-pole operating mechanism each comprising a handle and a connecting rod structure, the connecting rod structure comprising a connecting rod, a lever, a lock catch and a jump catch in snap-fit, the lock catch and the jump catch being rotationally arranged on the lever, the connecting rod being connected between the jump catch and the handle, and the moving contact of the L-pole operating mechanism and the N-pole operating mechanism each being mounted on the lever or on a contact support in driving cooperation with the lever, the handle being capable of driving the moving contact to contact or separate from the static contact through the connecting rod structure when the lock catch and the jump catch are in snap-fit.

[0027] Optionally, a size of the residual current operating mechanism in the first direction is 36 mm.

[0028] The residual current operating circuit breaker of the utility model, through compact structure, reasonable layout in the first chamber where N-pole unit is located, N-pole operating mechanism is obliquely arranged above and right side of residual current operating release, and above N-pole moving contact, make enough space between below residual current operating release and between second N-pole terminal and N-pole static contact, make N-pole can set electronic component board, residual current operating release and at least partial zero sequence mutual inductor, also can have short circuit protection device and operating mechanism, and short circuit protection device and residual current operating release are each independent release device, not only have short circuit protection, improve service life of circuit breaker, also improve reliability of N-pole contact closed contact.

[0029] In addition, N-pole is provided with arc extinguishing chamber, improve arc extinguishing ability, arc extinguishing chamber is reasonably arranged between first N-pole terminal and N-pole static contact and below N-pole moving contact, make N-pole internal structure compact.

[0030] In addition, N-pole moving contact, N-pole static contact and N-pole arc extinguishing chamber are respectively stacked on one side of insulating partition, insulating partition not only plays electrical isolation effect, separates N-pole moving contact, N-pole static contact and other elements such as electronic component board, improve safety, also play supporting and limiting effect to N-pole arc extinguishing chamber.

[0031] In addition, zero sequence mutual inductor is vertically placed in L-pole unit and N-pole unit, reduce space occupied in the first chamber where N-pole unit is located, facilitate N-pole unit to increase other functional modules to improve performance.

[0032] In addition, electronic component board is horizontally placed between first N-pole terminal and zero sequence mutual inductor and below N-pole short circuit protection device, so that N-pole moving contact and N-pole static contact can be arranged in layers with the electronic component board, and the arrangement is reasonable, which does not interfere with the arrangement of other structures in the N-pole, and facilitates wiring between the zero sequence mutual inductor and the residual current operating release. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the structure schematic diagram of N-pole unit and residual current module of the utility model;

[0034] Figure 2 It is the structure schematic diagram of L-pole unit of the utility model;

[0035] Figure 3 It is the structure schematic diagram of circuit breaker of the utility model;

[0036] Figure 4 It is the sectional view of N-pole short circuit protection device of the utility model;

[0037] Figure 5 It is the exploded view of static iron core, moving iron core and top rod of the utility model;

[0038] Figure 6 is the structure diagram of the unlocking part of the utility model;

[0039] Figure 7 is the conductive structure diagram of the N pole short circuit protection device of the utility model;

[0040] Figure 8 is the conductive structure diagram of the N pole short circuit protection device and L pole short circuit protection device of the utility model;

[0041] Figure 9 is the structure diagram of the insulation partition part in the utility model Figure 1

[0042] Figure 10 is the structure diagram of the L pole arc extinguishing chamber of the utility model;

[0043] Figure 11 is the structure diagram of the N pole operating mechanism and L pole operating mechanism of the utility model;

[0044] Figure 12 is the structure diagram of the testing device and the first wiring board of the utility model.

[0045] ​Test device 100; test button 110; test button body 111; connecting rod 112; driving block 113; limiting column 114; conductive elastic piece 120; first elastic arm 121; torsion spring body 122; second elastic arm 123; conductive part 124; residual current module 200; electronic component board 210; connecting hole 211; zero sequence mutual inductor 220; residual current operating release 230; shell 300; first cavity 301; second cavity 302; L pole cover 310; support frame 311; base 320; perforation 321; N pole cover 330; N pole unit 400; first N pole wiring terminal 410; first wiring board 420; first flexible connection 421; N pole moving contact 440; N pole static contact 450; fixed baffle 451; static contact 452; arc striking angle 453; first wire 454; second wiring board 460; wiring section 461; connecting section 462; second N pole wiring terminal 470; N pole operating mechanism 480; N pole handle 481; release 482; release elongated end 4821; N pole short-circuit protection device 490; coil framework 491; mounting cavity 4911; coil 492; static core 493; static core body 4931; accommodating groove 4932; positioning flange 4933; moving core 494; moving core body 4941; linkage column 4942; moving core spring 495; jacking rod 496; pushing part 4961; jacking rod body 4962; linkage groove 4963; N pole arc-extinguishing chamber 430; L pole unit 500; first L pole wiring terminal 510; third wiring board 520; L pole moving contact 530; L pole static contact 540; L pole arc-extinguishing chamber 550; first arc-extinguishing grid 551; second arc-extinguishing grid 552; fourth wiring board 560; wiring part 561; second wire 562; second L pole wiring terminal 570; L pole operating mechanism 580; L pole handle 581; L pole short-circuit protection device 590; overload protection device 600; linkage piece 700; linkage shaft 800; insulating partition 900; side flange 901; arc blocking rib 902; limiting rib 903; fixed column 910. DETAILED DESCRIPTION

[0046] The following examples, given in conjunction with the accompanying drawings, further illustrate the specific embodiments of the residual current circuit breaker of the present application. The residual current circuit breaker of the present application is not limited to the examples described below.

[0047] As Figures 1-3As shown, the residual current operated circuit breaker of this embodiment includes a housing 300, a residual current module 200, and an L-pole unit 500 and an N-pole unit 400 arranged along a first direction. The housing 300 has a first chamber 301 and a second chamber 302. The N-pole unit 400 is installed in the first chamber 301, and the L-pole unit 500 is installed in the second chamber 302. The residual current module 200 includes an electronic component board 210, a zero-sequence current transformer 220, and a residual current operated trip unit 230. The zero-sequence current transformer 220 and the residual current operated trip unit 230 are electrically connected to the electronic component board 210, and the residual current operated trip unit 230 and the electronic component board 210 are installed in the first chamber 301. The zero-sequence current transformer 220 is at least partially installed in the first chamber 301. All of the zero-sequence current transformers 220 are installed in the first chamber 301, or some of the zero-sequence current transformers 220 are located in the first chamber 301 and some are located in the second chamber 302.

[0048] The N-pole unit 400 of this embodiment includes a first N-pole terminal 410, an N-pole moving contact 440, an N-pole stationary contact 450, and a second N-pole terminal 470 arranged sequentially along a second direction. The N-pole unit 400 also includes an N-pole operating mechanism 480 and an N-pole short-circuit protection device 490. The N-pole short-circuit protection device 490 and the residual current operated trip unit 230 are respectively used to drive the N-pole operating mechanism 480 to unlock and trip. The N-pole short-circuit protection device 490 and the residual current operated trip unit 230 are arranged sequentially within a first chamber 301 along a third direction, and the N-pole short-circuit protection device 490 and the residual current operated trip unit... 230 is located in the second direction between the second N-pole terminal 470 and the N-pole stationary contact 450. The N-pole operating mechanism 480 is inclined. One end of the N-pole operating mechanism 480 is located in the third direction on the side of the residual current trip unit 230 away from the N-pole short circuit protection device 490. The other end of the N-pole operating mechanism 480 is located in the second direction on the side of the residual current trip unit 230 away from the second N-pole terminal 470. The other end of the N-pole operating mechanism 480 is connected to the N-pole moving contact 440. The N-pole operating mechanism 480 can drive the N-pole moving contact 440 to contact or separate from the N-pole stationary contact 450.

[0049] It should be noted that the first direction, the second direction, and the third direction are perpendicular to each other, with the first direction being... Figure 3 The Z direction is shown, and the second direction is... Figure 1 , Figure 2 and Figure 3 The X direction is shown, and the third direction is... Figure 1 and Figure 2The Y direction is shown. The first direction is also the width direction of the circuit breaker, the second direction is the length direction of the circuit breaker, and the third direction is the height direction of the circuit breaker.

[0050] The residual current operating circuit breaker of the embodiment has a compact structure and a reasonable layout in the first chamber 301 where the N-pole unit 400 is located. The N-pole operating mechanism 480 is obliquely arranged above and on the right side of the residual current operating tripping device 230 and above the N-pole movable contact 440. Therefore, there is sufficient space below the residual current operating tripping device 230 and between the second N-pole terminal 470 and the N-pole static contact 450. The N-pole can be provided with the electronic component board 210, the residual current operating tripping device 230, and at least part of the zero sequence transformer 220. The N-pole short circuit protection device and the operating mechanism can be combined. The N-pole short circuit protection device and the residual current operating tripping device 230 are independent tripping devices. The circuit breaker has short circuit protection, a long service life, and reliable N-pole contact closing.

[0051] As shown in Figure 4 and Figure 5 The N-pole short circuit protection device 490 of the embodiment includes a coil frame 491 provided with a mounting through cavity 4911, a coil 492 electrically connected between the N-pole static contact 450 and the second N-pole terminal 470, a static core 493 and a dynamic core 494 arranged opposite to each other in the mounting through cavity 4911 of the coil frame 491, a dynamic core spring 495 arranged between the static core 493 and the dynamic core 494 and used for driving the dynamic core to reset, and a top rod 496 linked with the dynamic core 494 synchronously and used for driving the N-pole operating mechanism 480 to unlock and trip. In particular, the coil frame 491 is a square column structure, and the coil 492 is a spiral structure sleeved on the coil frame 491. The spiral center of the spiral structure is arranged along the length direction of the coil frame 491, and the cross section of the spiral center in the vertical direction is square.

[0052] The N-pole short circuit protection device 490 of the embodiment is designed to be small in size. The square coil 492 is used to improve the space utilization rate and reduce the occupied space of the N-pole short circuit protection device 490 in the first chamber 301. Of course, as another embodiment, the N-pole short circuit protection device 490 can also have a structure similar to the L-pole short circuit protection device 590, but the space of other components in the N-pole unit 400 is compressed.

[0053] As shown in Figure 1 and Figures 4-6As shown, the N-pole operating mechanism 480 of the embodiment includes an N-pole handle 481 and an unlocking member 482 for unlocking the N-pole operating mechanism 480, the residual current operating trip 230 is arranged opposite to the unlocking member 482 and is used to drive the unlocking member 482 to unlock the N-pole operating mechanism 480; one end of the top rod 496 of the N-pole short-circuit protection device 490 extends in the direction of the residual current operating trip 230 (i.e. along the third direction) and is provided with a pushing portion 4961, the unlocking member 482 is extended and provided with an unlocking member elongated end 4821 opposite to the pushing portion 4961, and the pushing portion 4961 can push the unlocking member elongated end 4821 to drive the unlocking member 482 to unlock the N-pole operating mechanism 480.

[0054] It should be noted that the technical principle of the N-pole operating mechanism 480 is the prior art, the handle drives the movable contact through a connecting rod structure to make the movable contact contact or separate from the static contact to turn on or turn off the main circuit. The connecting rod structure usually includes a connecting rod, a lever, a lock catch and a trip catch which are rotationally arranged on the lever, the connecting rod is connected between the trip catch and the handle, the movable contact is installed on the lever or a contact support which is drivingly matched with the lever, when the lock catch and the trip catch are snap-fitted, the handle drives the movable contact to contact or separate from the static contact through the connecting rod structure, the lock catch is pushed to rotate to release the snap-fitting of the lock catch and the trip catch, so that the operating mechanism is unlocked and tripped, the movable contact is driven to separate from the static contact to achieve the tripping protection, which will not be described here. The unlocking member 482 of the embodiment is the lock catch of the N-pole operating mechanism 480.

[0055] The operation process of the N-pole short-circuit protection device 490 of the embodiment is as follows: when the coil 492 generates a short-circuit current, the moving iron core 494 moves towards the static iron core 493, the top rod 496 moves with the moving iron core 494, the pushing portion 4961 pushes the unlocking member elongated end 4821, the unlocking member 482 rotates to release the snap-fitting of the trip catch of the N-pole operating mechanism 480, the N-pole operating mechanism 480 is unlocked and tripped to drive the N-pole movable contact 440 to separate from the N-pole static contact 450 to complete the short-circuit protection function, and then the moving iron core spring 495 releases energy to drive the moving iron core 494 to move away from the static iron core 493, so as to push the moving iron core 494 and the top rod 496 back to the initial position.

[0056] The N-pole operating mechanism 480 of the embodiment has other parts which are the same as those of the L-pole except the lock catch (the unlocking member 482), so that the types of parts are reduced, and the lock catch only needs to be extended to set the driven part, which is easy to implement.

[0057] Preferably, the mounting cavity 4911 is a square through hole penetrating the coil skeleton 491 along the length direction of the coil skeleton 491 (i.e. the second direction). Both the moving iron core 494 and the static iron core 493 can be square block structures, which are simple in structure and can increase the volume of the moving and static iron cores as much as possible, thereby realizing the miniaturization design of the N-pole short circuit protection device 490 while ensuring the electromagnetic performance of the moving and static iron cores.

[0058] As shown in Figure 4 and Figure 5 , the moving iron core 494 of the embodiment includes a moving iron core body 4941 which is a square block structure matched with the mounting cavity 4911 and is slidingly arranged in the mounting cavity 4911 along the second direction. A linkage column 4942 is protrusively arranged on one end of the moving iron core body 4941 facing the static iron core 493.

[0059] As shown in Figure 4 and Figure 5 , the static iron core 493 of the embodiment includes a static iron core body 4931 which is a square block structure matched with the mounting cavity 4911 and is fixed in the mounting cavity 4911. An accommodating groove 4932 is arranged on one end of the static iron core 493 facing the moving iron core 494. The other end of the static iron core body 4931 extends out of the mounting cavity 4911 and is provided with a positioning flange 4933 on both sides of the end, which abuts against the coil skeleton 491.

[0060] As shown in Figure 4 and Figure 5 , the ejector rod 496 of the embodiment includes an ejector rod body 4962, one end of which is connected with a pushing part 4961, and the other end of which penetrates the static iron core 493 and is connected with the moving iron core 494. Preferably, the ejector rod body 4962 is a square column structure, and the pushing part 4961 is a straight plate structure. Further, the other end of the ejector rod body 4962 is provided with a linkage groove 4963 matched with the linkage column 4942, and the linkage column 4942 is fixed in the linkage groove 4963 to realize the synchronous linkage of the ejector rod 496 and the moving iron core 494. Preferably, the linkage column 4942 and the linkage groove 4963 are square.

[0061] As shown in Figure 4 , the moving iron core spring 495 of the embodiment is preferably a compression spring, which is sleeved on the other end of the ejector rod body 4962, one end of which is arranged in the accommodating groove 4932 of the static iron core 493, and the other end of which abuts against the moving iron core 494. Of course, the moving iron core spring 495 can also be an elastic member such as a tension spring, a torsion spring or a leaf spring.

[0062] As Figure 1 , Figure 3 and Figure 7 shown, the shell 300 of the present embodiment comprises an L pole cover 310, a base 320 and an N pole cover 330 arranged in sequence along a first direction, wherein the N pole cover 330 covers one side of the base 320 to form the first chamber 301, the L pole cover 310 covers the other side of the base 320 to form the second chamber 302, the base 320 of the shell 300 is provided with a through hole 321 communicating the first chamber 301 and the second chamber 302, and the L pole cover 310 is provided with a support frame 311 protruding towards the base 320 (i.e. along the first direction). The shell 300 of the present embodiment shares the same base 320 for the N pole cover 330 and the L pole cover 310. Of course, as other embodiments, the shell 300 can also comprise an N pole shell for accommodating the N pole unit 400 and an L pole shell for accommodating the L pole unit 500, which are independent of each other.

[0063] As Figure 1 and Figure 7 shown, the layout structure of the zero sequence mutual inductor 220 of the present embodiment, the axial hole of the zero sequence mutual inductor 220 faces the N pole short circuit protection device 490 and the residual current operated circuit breaker 230, i.e. the axial direction of the zero sequence mutual inductor 220 is arranged along a second direction, a part of the zero sequence mutual inductor 220 is located in the first chamber 301, another part of the zero sequence mutual inductor 220 is located on one side of the N pole short circuit protection device 490 and the residual current operated circuit breaker 230 in the second direction (i.e. between the N pole short circuit protection device 490 and the second N pole terminal 470 and between the residual current operated circuit breaker 230 and the second N pole terminal 470), the part of the zero sequence mutual inductor 220 passing through the through hole 321 extends into the second chamber 302, and the part of the zero sequence mutual inductor 220 extending into the second chamber 302 is placed on the support frame 311. The zero sequence mutual inductor 220 is vertically arranged in the L pole unit 500 and the N pole unit 400, which reduces the space occupied in the first chamber 301 where the N pole unit 400 is located, and facilitates the N pole unit 400 to increase other functional modules to improve performance.

[0064] As Figure 1As shown, the electronic component board 210 of this embodiment is arranged in the first chamber 301 along the second direction, between the first N-pole terminal 410 and the zero-sequence current transformer 220. One end of the electronic component board 210 is located on one side of the N-pole moving contact 440 and the N-pole stationary contact 450 in the first direction, and the other end of the electronic component board 210 is located on the side of the N-pole short-circuit protection device 490 away from the residual current operated trip unit 230. The electronic component board 210 is horizontally placed between the first N-pole terminal 410 and the zero-sequence current transformer 220, and below the N-pole short-circuit protection device 490, so that the N-pole moving contact 440 and the N-pole stationary contact 450 can be stacked with the electronic component board 210 at intervals, which is a reasonable arrangement that does not interfere with the arrangement of other structures in the N-pole and facilitates wiring between the zero-sequence current transformer 220 and the residual current operated trip unit 230.

[0065] In this embodiment, the residual current circuit breaker has a residual current module 200 arranged in the L-pole unit 500 and the N-pole unit 400. The zero-sequence current transformer 220 occupies part of the space in the L-pole unit 500. The residual current trip unit 230, the electronic component board 210 and the testing device are located in the N-pole unit 400. The entire residual current circuit breaker has a size of 36mm in the first direction, which only requires the space of two modules. One module is about 18mm, so the width of the residual current circuit breaker is 36mm.

[0066] like Figure 1 As shown, the conductive structure between the first N-pole terminal 410 and the N-pole moving contact 440 in this embodiment is as follows: the first N-pole terminal 410 is electrically connected to the N-pole moving contact 440 through the first conductive structure. The first conductive structure includes a first terminal block 420 and a first flexible connection 421. One end of the first terminal block 420 is inserted into the first N-pole terminal 410 and cooperates with the first N-pole terminal 410 for external connection. The two ends of the first flexible connection 421 are respectively welded to the other end of the first terminal block 420 and the N-pole moving contact 440.

[0067] like Figure 1 , Figure 7 and Figure 8As shown, the conductive structure between the second N-pole terminal 470 and the N-pole static contact 450 of the embodiment, the N-pole short-circuit protection device 490 is electrically connected between the second N-pole terminal 470 and the N-pole static contact 450, the second N-pole terminal 470 is electrically connected with the N-pole short-circuit protection device 490 through a second conductive structure, and the second conductive structure passes through the axial hole of the zero sequence transformer 220. For example, the second conductive structure is a second wiring board 460, which includes a connecting section 462 and a wiring section 461 connected in sequence in the second direction, the wiring section 461 is inserted into the second N-pole terminal 470 and cooperates with the second N-pole terminal 470 to be externally connected, the connecting section 462 passes through the axial hole of the zero sequence transformer 220 and is located on the side of the N-pole short-circuit protection device 490 away from the residual current operating trip device 230 in the third direction, and the connecting section 462 is electrically connected with the coil 492 of the N-pole short-circuit protection device 490. The electrical connection between the connecting section 462 and the coil 492 can be achieved by welding. The structure of the second wiring board 460 is optimized, the connecting section 462 passes through the axial hole of the zero sequence transformer 220 and is electrically connected on one side of the N-pole short-circuit protection device 490, which simplifies the structure and reduces the occupied space.

[0068] Specifically, the wiring section 461 is preferably a straight structure arranged in the second direction; the connecting section 462 is preferably a bent structure composed of three sections connected in sequence perpendicularly, one section of the connecting section 462 connected with the wiring section 461 is arranged in the second direction, the middle section of the connecting section 462 is arranged in the third direction, and the other section of the connecting section 462 is arranged in the second direction.

[0069] As shown in Figure 1 and Figure 9 As shown, the N-pole unit 400 of the embodiment further includes an N-pole arc-extinguishing chamber 430, which is located between the first N-pole terminal 410 and the N-pole static contact 450 in the second direction, and is located on the side of the N-pole moving contact 440 away from the N-pole operating mechanism 480 in the third direction. The N-pole is provided with an arc-extinguishing chamber, which improves the arc-extinguishing capability, and the arc-extinguishing chamber is reasonably arranged between the first N-pole terminal 410 and the N-pole static contact 450 and below the N-pole moving contact 440, so that the structure inside the N-pole is compact.

[0070] Preferably, the side of the N-pole arc-extinguishing chamber 430 close to the N-pole moving contact 440 is inclined to the direction away from the first N-pole terminal 410 and close to the N-pole static contact 450. The arc-extinguishing chamber 430 is inclined to the moving and static contact contact position of the N-pole, which facilitates the arc to enter the N-pole arc-extinguishing chamber 430 better and improves the arc-extinguishing effect of the N-pole.

[0071] As shown in Figure 1 and Figure 9As shown, the residual current circuit breaker of the embodiment further comprises an insulating partition plate 900, which is located on one side of the N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 in the first direction, i.e. the electronic component board 210 is located on one side of the insulating partition plate 900 in the first direction, and the N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 are located on the other side of the insulating partition plate 900 in the first direction, so that the insulating partition plate 900 is interposed between the N-pole moving contact 440 and the electronic component board 210, between the N-pole static contact 450 and the electronic component board 210, and between the N-pole arc extinguishing chamber 430 and the electronic component board 210, and part of the electronic component board 210 is not shown and is shielded by the insulating partition plate 900. Among them, the N-pole arc extinguishing chamber 430 is directly placed on the insulating partition plate 900, and at least one limiting rib 903 is protrudingly arranged on the insulating partition plate 900 for limiting the N-pole arc extinguishing chamber 430. The N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430 are respectively stacked on one side of the insulating partition plate 900, and the insulating partition plate 900 not only plays an electrical isolation role to separate the N-pole moving contact 440, the N-pole static contact 450 and other elements such as the electronic component board 210, thereby improving safety, but also plays a supporting and limiting role to the N-pole arc extinguishing chamber 430. The insulating partition plate 900 is provided with an arc blocking rib 902 protruding therefrom, and the arc blocking rib 902 is located on the side of the N-pole arc extinguishing chamber 430 away from the N-pole moving contact 440. The arc blocking rib 902 is arranged to block the splashing of the electric arc.

[0072] For example, two limiting ribs 903 are protrudingly arranged on the insulating partition plate 900, one limiting rib 903 is a straight structure and is located on the side of the N-pole arc extinguishing chamber 430 close to the N-pole moving contact 440, and the other limiting rib 903 is a U-shaped structure with an opening facing the N-pole arc extinguishing chamber 430 and away from the limiting rib 903, and is located on the side of the N-pole arc extinguishing chamber 430 away from the N-pole moving contact 440.

[0073] Further, a side flange 901 is protrudingly arranged on the side of the insulating partition plate 900 facing the N-pole moving contact 440, the N-pole static contact 450 and the N-pole arc extinguishing chamber 430, so as to improve the isolation and protection effect; and a supporting leg is protrudingly arranged on the other side of the insulating partition plate 900 for supporting on the base 320.

[0074] As Figure 7 and Figure 8As shown, the N-pole stationary contact 450 in this embodiment includes a fixed protective plate 451. A stationary contact point 452 is provided on the side of the fixed protective plate 451 facing the N-pole moving contact 440, which contacts the N-pole moving contact 440. The fixed protective plate 451 extends towards the N-pole arc-extinguishing chamber 430 and is provided with an arc-inducing angle 453, meaning the N-pole arc-extinguishing chamber 430 is located between the arc-inducing angle 453 of the N-pole stationary contact 450 and the first N-pole terminal 410. The fixed protective plate 451 is electrically connected to the N-pole short-circuit protection device 490 via a first wire 454. One end of the first wire 454 is welded to the side of the fixed protective plate 451 facing away from the N-pole moving contact 440, and the other end of the first wire 454 is welded to one end of the coil 492 of the N-pole short-circuit protection device 490.

[0075] like Figure 2 As shown, the L-pole unit 500 in this embodiment includes a first L-pole terminal 510, an L-pole moving contact 530, an L-pole stationary contact 540, an L-pole arc-extinguishing chamber 550, a second L-pole terminal 570, and an L-pole short-circuit protection device 590. The first L-pole terminal 510, the L-pole moving contact 530, the L-pole stationary contact 540, the L-pole arc-extinguishing chamber 550, the portion of the zero-sequence current transformer 220 extending into the second chamber 302, and the second L-pole terminal 570 are arranged sequentially along a second direction. The L-pole arc-extinguishing chamber 550 and the L-pole short-circuit protection device 590 are also arranged sequentially along a third direction.

[0076] like Figure 2 As shown, the first L-pole terminal 510 is electrically connected to the L-pole moving contact 530. Exemplarily, the L-pole unit 500 also includes an overload protection device 600, which is a bimetallic strip. The overload protection device 600 is located between the first L-pole terminal 510 and the L-pole moving contact 530. The overload protection device 600 is electrically connected to the first L-pole terminal 510 via a third terminal block 520. One end of the third terminal block 520 is inserted into the first L-pole terminal 510 and cooperates with the first L-pole terminal 510 for external connection. The other end of the third terminal block 520 is soldered to the overload protection device 600. The overload protection device 600 is electrically connected to the L-pole moving contact 530 via a second flexible connection, with both ends of the second flexible connection soldered to the overload protection device 600 and the L-pole moving contact 530, respectively.

[0077] like Figure 2 and Figure 8As shown, the conductive structure between the second L-pole terminal 570 and the L-pole short-circuit protection device 590 in the embodiment is electrically connected through a third conductive structure which passes through the axial hole of the zero-sequence transformer 220. Specifically, the third conductive structure includes a fourth terminal plate 560 and a second wire 562. One end of the fourth terminal plate 560 is inserted into the second L-pole terminal 570 and cooperates with the second L-pole terminal 570 for external connection. The other end of the fourth terminal plate 560 extends in the first direction and is provided with a terminal portion 561 which is located between the zero-sequence transformer 220 and the second N-pole terminal 470. One end of the second wire 562 is connected to the terminal portion 561 and the other end of the second wire 562 passes through the axial hole of the zero-sequence transformer 220 and is electrically connected to the L-pole short-circuit protection device 590. The terminal portion 561 of the fourth terminal plate 560 which extends to the side of the zero-sequence transformer 220 and the second wire 562 which is easy to arrange optimize the conductive structure between the second L-pole terminal 570 and the L-pole short-circuit protection device 590 and reduce the occupied space.

[0078] As shown in Figure 2 and Figure 10 , the side of the L-pole arc-extinguishing chamber 550 which faces the second L-pole terminal 570 is designed as a stepped structure. The stepped structure forms a gap between the second L-pole terminal 570 and the gap forms a space for accommodating the zero-sequence transformer 220. Specifically, the L-pole arc-extinguishing chamber 550 includes a plurality of first arc-extinguishing fins 551 and a plurality of second arc-extinguishing fins 552. The first arc-extinguishing fins 551 and the second arc-extinguishing fins 552 are arranged in the third direction and the second arc-extinguishing fins 552 are shorter than the first arc-extinguishing fins 551 to form the stepped structure. The side of the L-pole arc-extinguishing chamber 550 is designed as a stepped structure which guarantees the arc-extinguishing ability of the L-pole arc-extinguishing chamber 550 and provides space for the zero-sequence transformer 220.

[0079] As shown in Figure 2 and Figure 11As shown, the L-pole unit 500 further comprises an L-pole operating mechanism 580, which is obliquely arranged, one end of the L-pole operating mechanism 580 is located on the side of the L-pole short-circuit protection device 590 away from the L-pole arc-extinguishing chamber 550 in the third direction, the other end of the L-pole operating mechanism 580 is connected with the L-pole movable contact 530, and the L-pole operating mechanism 580 can drive the L-pole movable contact 530 to contact or separate from the L-pole stationary contact 540. One end of the L-pole operating mechanism 580 is provided with an L-pole handle 581, and the L-pole handle 581 and the N-pole handle 481 are synchronously linked through a linkage 700, both ends of the linkage 700 are connected with the L-pole handle 581 and the N-pole handle 481 respectively. The handles of the operating mechanisms of the two poles are assembled with the linkage 700 to realize synchronous closing and opening operation.

[0080] It should be noted that the technical principle of the L-pole operating mechanism 580 is prior art, the handle drives the movable contact through a connecting rod structure to make the movable contact contact or separate from the stationary contact to turn on or turn off the main circuit. The connecting rod structure usually comprises a connecting rod, a lever, a lock catch and a trip catch which are snap-fitted, the lock catch and the trip catch are rotationally arranged on the lever, the connecting rod is connected between the trip catch and the handle, the movable contact is installed on the lever or a contact support which is drivingly matched with the lever, when the lock catch and the trip catch are snap-fitted, the handle drives the movable contact to contact or separate from the stationary contact through the connecting rod structure, the lock catch is pushed to rotate to release the snap-fitting of the lock catch and the trip catch, so that the operating mechanism is unlocked and tripped to drive the movable contact to separate from the stationary contact to realize tripping protection, which will not be described herein. The lock catches of the N-pole operating mechanism 480 and the L-pole operating mechanism 580 are linked through a linkage shaft 800 to realize synchronous unlocking and tripping.

[0081] As shown in Figure 1 and Figure 12 The residual current module 200 of the embodiment further comprises a test device 100, which comprises a test circuit and a test button 110, and pressing the test button 110 can turn on the test circuit to simulate generation of residual current for detecting whether the residual current protection function is normal.

[0082] It should be noted that the working principle of the residual current circuit breaker protection is prior art, when the residual current in the main circuit reaches a predetermined threshold value detected by the zero sequence transformer 220, the electronic component board 210 controls the residual current operating tripping device 230 to perform tripping action to turn off the main circuit to realize circuit breaking protection; the electronic component board 210 usually takes power from the main circuit, and the electronic component board 210 at least comprises part of the test circuit for simulating generation of residual current, which will not be described herein.

[0083] As shown in Figure 1 and Figure 12As shown, the test device of the embodiment includes a test button 110 and a conductive elastic member 120, the test button 110 is slidingly arranged on the housing 300 at a side of the N-pole operating mechanism 480 away from the residual current operating trip device 230, and the test button 110 is movable between an initial position and a test position, when the test button 110 moves from the initial position to the test position, the conductive elastic member 120 is driven to connect the electronic component board 210 and the first N-pole terminal 410 in conduction, the electronic component board 210 is powered by contacting the first wiring board 420 in the main circuit through the conductive elastic member 120; the conductive elastic member 120 is used to drive the test button 110 to reset from the test position to the initial position.

[0084] Specifically, the conductive elastic member 120 is located at a side of the electronic component board 210 close to the L-pole unit 500 and away from the insulating partition plate 900, the conductive elastic member 120 includes a conductive part 124 and a first elastic arm 121, the conductive part 124 is directly electrically connected with the electronic component board 210, the first elastic arm 121 is arranged in spaced relation with the first wiring board 420, the test button 110 is drivingly matched with the first elastic arm 121, when the test button 110 moves from the initial position to the test position, the first elastic arm 121 is driven to contact the first wiring board 420, the electronic component board 210 is powered by contacting the first wiring board 420 in the main circuit through the conductive elastic member 120 of the test device 100; the first elastic arm 121 is used to drive the test button 110 to reset from the test position to the initial position.

[0085] When the test button 110 is pressed, i.e. the test button 110 moves from the initial position to the test position, the test button 110 drives the first elastic arm 121 of the conductive elastic member 120 to contact the first wiring board 420 to connect the test circuit of the electronic component board 210 in conduction, generates a simulated residual current, so that the electronic component board 210 controls the residual current operating trip device 230 to perform a tripping action, and completes the residual current operating test; when the test button 110 is released, the first elastic arm 121 returns to be separated from the first wiring board 420, and at the same time, the first elastic arm 121 drives the test button 110 to reset from the test position to the initial position.

[0086] The test device 100 of the embodiment, the conductive elastic member 120 serves as both a conductive member between the electronic component board 210 and the first wiring board 420 and a reset member of the test button 110, reduces parts, simplifies structure, reduces occupied space, and the conductive elastic member 120 is directly electrically connected with the electronic component board 210, and the electronic component board 210 is powered by contacting the first wiring board 420 in the main circuit, reduces conductive connection points, and improves the reliability of the residual current operating test function.

[0087] AsFigure 12 As shown, the test button 110 in this embodiment includes a test button body 111, which is slidably disposed within a sliding hole in the housing 300. A connecting rod 112 extends from the test button body 111 along its sliding direction, and a driving block 113 for driving the first elastic arm 121 is provided at the end of the connecting rod 112. The slender connecting rod 112 of the test button 110 extends from the side of the N-pole operating mechanism 480 away from the residual current trip unit 230, substantially close to the side wall of the housing 300, to below the N-pole operating mechanism 480, near the N-pole moving contact 440. The test button 110 is designed with a slender structure, allowing it to be placed in a narrow space, facilitating a more rational and compact layout of other structures within the pole where the test device 100 is located.

[0088] Furthermore, the drive block 113 of the test button 110 is provided with two spaced-apart limiting posts 114, forming a limiting gap between the two limiting posts 114 that corresponds to the first elastic arm 121. When the drive block 113 acts on the first elastic arm 121, the first elastic arm 121 is limited within the limiting gap, making the cooperation between the test button 110 and the first elastic arm 121 more reliable.

[0089] like Figure 12 As shown, the conductive elastic element 120 in this embodiment is a torsion spring, including a torsion spring body 122. The torsion spring body 122 is located on the side of the electronic component board 210 away from the insulating partition 900. A protruding fixing post 910 is provided on the portion of the insulating partition 900 protruding from the electronic component board 210. The torsion spring body 122 is fitted onto the fixing post 910. The two ends of the torsion spring body 122 extend to form a first elastic arm 121 and a second elastic arm 123, respectively. The first elastic arm 121 is located between the test button 110 and the first wiring board 420. The second elastic arm 123 is located on one side of the electronic component board 210 and extends towards the electronic component board 210 to form the conductive portion 124. The conductive elastic element 120 has a simple structure, is easy to manufacture, and can be compactly arranged with the test button 110, the first wiring board 420, and the electronic component board 210, reducing space occupation. Of course, the conductive elastic element 120 can also be a spring sheet or other elastic structures.

[0090] Preferably, the conductive portion 124 of the conductive elastic element 120 is electrically connected to the electronic component board 210 in a rigid fixed manner. The electronic component board 210 is provided with a connection hole 211, and the conductive portion 124 is inserted and fixed in the connection hole 211 to achieve electrical connection with the electronic component board 210. Of course, the conductive portion 124 and the electronic component board 210 can also be soldered together.

[0091] The residual current operating trip device 230 and the L pole short circuit protection device 590 of the embodiment are all prior arts, when the residual current or short circuit current appears in the main circuit, the top rod of the residual current operating trip device 230 or the L pole short circuit protection device 590 pushes the lock catch to rotate, so that the operating mechanism is unlocked and tripped, and the circuit breaker is protected, which will not be repeated here.

[0092] It should be noted that, in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when used, and are only for the convenience of description, and do not indicate that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0093] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be regarded as falling within the protection scope of the present application.

Claims

1. A residual current circuit breaker, comprising a housing (300), a residual current module (200), and an L-pole unit (500) and an N-pole unit (400) arranged along a first direction, the housing (300) is provided with a first chamber (301) and a second chamber (302), the N-pole unit (400) is installed in the first chamber (301), and the L-pole unit (500) is installed in the second chamber (302); the residual current module (200) comprises an electronic component board (210), a zero sequence transformer (220), and a residual current operating mechanism (230), and the zero sequence transformer (220) and the residual current operating mechanism (230) are electrically connected with the electronic component board (210) respectively; The N-pole unit (400) comprises a first N-pole terminal (410), an N-pole moving contact (440), an N-pole stationary contact (450) and a second N-pole terminal (470) arranged in sequence along a second direction, characterized in that: the N-pole unit (400) further comprises an N-pole operating mechanism (480) and an N-pole short-circuit protection device (490), the N-pole short-circuit protection device (490) and the residual current operating mechanism (230) are arranged in a third direction in the first chamber (301) in sequence, and the N-pole short-circuit protection device (490) and the residual current operating mechanism (230) are located between a second N-pole terminal (470) and an N-pole static contact (450) in a second direction, the N-pole operating mechanism (480) is obliquely arranged, one end of the N-pole operating mechanism (480) is located on a side of the residual current operating mechanism (230) away from the N-pole short-circuit protection device (490) in the third direction, the other end of the N-pole operating mechanism (480) is located on a side of the residual current operating mechanism (230) away from the second N-pole terminal (470) in the second direction, and the other end of the N-pole operating mechanism (480) is connected with an N-pole moving contact (440); wherein the first N-pole terminal (410) is electrically connected with the N-pole moving contact (440), the N-pole short-circuit protection device (490) is electrically connected between the second N-pole terminal (470) and the N-pole static contact (450), the second N-pole terminal (470) is electrically connected with the N-pole short-circuit protection device (490) through a second conductive structure, and the second conductive structure passes through an axial hole of the zero sequence transformer (220); the N-pole short-circuit protection device (490) and the residual current operating mechanism (230) are respectively used for driving the N-pole operating mechanism (480) to be unlocked and tripped; the first direction, the second direction, and the third direction are perpendicular to each other.

2. The residual current operated circuit breaker according to claim 1, characterized in that: the N-pole unit (400) further comprises an N-pole arc-extinguishing chamber (430), the N-pole arc-extinguishing chamber (430) is located between the first N-pole terminal (410) and the N-pole static contact (450) in the second direction, and the N-pole arc-extinguishing chamber (430) is located on a side of the N-pole moving contact (440) away from the N-pole operating mechanism (480) in the third direction.

3. The residual current operated circuit breaker according to claim 2, characterized in that: Further comprising an insulating partition plate (900) located on one side of the N-pole moving contact (440), the N-pole static contact (450) and the N-pole arc-extinguishing chamber (430) in the first direction, wherein the N-pole arc-extinguishing chamber (430) is directly placed on the insulating partition plate (900), and at least one limiting rib (903) is protruded on the insulating partition plate (900) for limiting the N-pole arc-extinguishing chamber (430).

4. The residual current operated circuit breaker according to claim 2, characterized in that: The N-pole arc-extinguishing chamber (430) is inclined to the direction away from the first N-pole terminal (410) and close to the N-pole static contact (450) on the side close to the N-pole moving contact (440).

5. The residual current circuit breaker according to claim 1, characterized in that: The shell (300) is provided with a through hole (321) for communicating the first chamber (301) and the second chamber (302), the axial direction of the zero sequence transformer (220) is arranged along the second direction, a part of the zero sequence transformer (220) is located in the first chamber (301), another part of the zero sequence transformer (220) is located between the N-pole short-circuit protection device (490) and the second N-pole terminal (470) in the second direction, and the other part of the zero sequence transformer (220) penetrates through the through hole (321) and extends into the second chamber (302).

6. The residual current operated circuit breaker according to claim 5, characterized in that: The electronic component board (210) is arranged in the first chamber (301) along the second direction and between the first N-pole terminal (410) and the zero sequence transformer (220), one end of the electronic component board (210) is located on the side of the N-pole moving contact (440) and the N-pole static contact (450) in the first direction, and the other end of the electronic component board (210) is located on the side of the N-pole short-circuit protection device (490) away from the residual current operating trip device (230).

7. The residual current circuit breaker according to claim 5, characterized in that: The second conductive structure is a second terminal plate (460) comprising a connecting section (462) and a terminal section (461) connected in sequence along the second direction, the terminal section (461) is inserted into the second N-pole terminal (470), the connecting section (462) penetrates through the axial hole of the zero sequence transformer (220) and is located on the side of the N-pole short-circuit protection device (490) away from the residual current operating trip device (230) in the third direction, and the connecting section (462) is electrically connected with the N-pole short-circuit protection device (490).

8. The residual current circuit breaker according to claim 5, characterized in that: The shell (300) comprises an L-pole cover (310), a base (320) and an N-pole cover (330) arranged in sequence along the first direction, wherein the N-pole cover (330) covers one side of the base (320) to form the first chamber (301), the L-pole cover (310) covers the other side of the base (320) to form the second chamber (302), the L-pole cover (310) is protruded with a support frame (311) along the first direction, and the part of the zero sequence transformer (220) extending into the second chamber (302) is placed on the support frame (311).

9. The residual current circuit breaker according to claim 5, characterized in that: The L-pole unit (500) comprises a first L-pole terminal (510), an L-pole moving contact (530), an L-pole static contact (540), an L-pole arc-extinguishing chamber (550), a second L-pole terminal (570) and an L-pole short-circuit protection device (590), the first L-pole terminal (510), the L-pole moving contact (530), the L-pole static contact (540), the L-pole arc-extinguishing chamber (550), the part of the zero-sequence transformer (220) extending into the second cavity (302) and the second L-pole terminal (570) are sequentially arranged along a second direction, and the L-pole arc-extinguishing chamber (550) is further sequentially arranged with the L-pole short-circuit protection device (590) along a third direction. The first L-pole terminal (510) is electrically connected with the L-pole moving contact (530), the second L-pole terminal (570) is electrically connected with the L-pole short-circuit protection device (590) through a third conductive structure, and the third conductive structure passes through the axial hole of the zero-sequence transformer (220).

10. The residual current operated circuit breaker according to claim 9, characterized in that: The third conductive structure comprises a fourth terminal plate (560) and a second wire (562), one end of the fourth terminal plate (560) is inserted into the second L-pole terminal (570), the other end of the fourth terminal plate (560) extends in the first direction and is provided with a terminal part (561), the terminal part (561) extends into the perforation (321), one end of the second wire (562) is connected to the terminal part (561), and the other end of the second wire (562) passes through the axial hole of the zero-sequence transformer (220) and is electrically connected with the L-pole short-circuit protection device (590).

11. The residual current circuit breaker according to claim 9, characterized in that: The side of the L-pole arc-extinguishing chamber (550) facing the second L-pole terminal (570) is in a stepped structure, a gap formed by the stepped structure forms an accommodation space between the L-pole arc-extinguishing chamber (550) and the second L-pole terminal (570), and the accommodation space is used for accommodating the zero-sequence transformer (220). The L-pole arc-extinguishing chamber (550) comprises a plurality of first arc-extinguishing fins (551) and a plurality of second arc-extinguishing fins (552), the first arc-extinguishing fins (551) and the second arc-extinguishing fins (552) are arranged in a spaced manner along the third direction, and the second arc-extinguishing fins (552) are shorter than the first arc-extinguishing fins (551) to form the stepped structure.

12. The residual current circuit breaker according to claim 9, characterized in that: One end of the N-pole operating mechanism (480) is provided with an N-pole handle (481), the L-pole unit (500) further comprises an L-pole operating mechanism (580), the L-pole operating mechanism (580) is obliquely arranged, one end of the L-pole operating mechanism (580) is located on the side of the L-pole short-circuit protection device (590) away from the L-pole arc-extinguishing chamber (550) in the third direction, the other end of the L-pole operating mechanism (580) is connected with the L-pole moving contact (530), one end of the L-pole operating mechanism (580) is provided with an L-pole handle (581), the L-pole handle (581) and the N-pole handle (481) are synchronously linked through a linkage (700), and the two ends of the linkage (700) are connected with the L-pole handle (581) and the N-pole handle (481) respectively.

13. The residual current circuit breaker according to claim 1, characterized in that: The residual current module (200) further comprises a test device (100), the test device (100) comprises a test button (110) and a conductive elastic piece (120), the test button (110) is slidingly arranged on the shell (300) and located on the side of the N-pole operating mechanism (480) away from the residual current operating tripper (230), and the test button (110) can move between an initial position and a test position, and when the test button (110) moves from the initial position to the test position, the conductive elastic piece (120) is driven to conduct the electronic component board (210) and the first N-pole terminal (410); the conductive elastic piece (120) is used to drive the test button (110) to reset from the test position to the initial position.

14. The residual current circuit breaker according to claim 1, characterized in that: The N-pole short-circuit protection device (490) comprises a coil former (491) provided with a mounting through cavity (4911), a coil (492) electrically connected between the N-pole static contact (450) and the second N-pole terminal (470), a static iron core (493) and a moving iron core (494) oppositely arranged in the mounting through cavity (4911) of the coil former (491), a moving iron core spring (495) arranged between the static iron core (493) and the moving iron core (494) and used to drive the moving iron core to reset, and a top rod (496) synchronously linked with the moving iron core (494) and used to drive the N-pole operating mechanism (480) to unlock and trip; the coil former (491) is a square column structure, and the coil (492) is a spiral structure sleeved on the coil former (491), the spiral center of the spiral structure is arranged along the length direction of the coil former (491), and the cross section of the spiral center of the spiral structure in the vertical direction is square.

15. The residual current circuit breaker according to claim 14, characterized in that: The N-pole operating mechanism (480) comprises an unlocking device (482) used to unlock and trip the N-pole operating mechanism (480), one end of the top rod (496) is provided with a pushing part (4961) extending in a third direction, the unlocking device (482) is provided with an unlocking device elongated end (4821) opposite to the pushing part (4961), and the pushing part (4961) can push the unlocking device elongated end (4821) to drive the unlocking device (482) to unlock and trip the N-pole operating mechanism (480).

16. The residual current circuit breaker according to claim 14, characterized in that: The mounting through cavity (4911) is a square through hole penetrating through the coil former (491) along a second direction; the moving iron core (494) comprises a moving iron core body (4941), the moving iron core body (4941) is a square block structure matched with the mounting through cavity (4911), and the moving iron core body (4941) is slidingly arranged in the mounting through cavity (4911) along the second direction; the static iron core (493) comprises a static iron core body (4931), the static iron core body (4931) is a square block structure matched with the mounting through cavity (4911), and the static iron core body (4931) is fixed in the mounting through cavity (4911).

17. The residual current circuit breaker according to claim 1, characterized in that: The L-pole operating mechanism (580) and the N-pole operating mechanism (480) each include a handle and a linkage structure, the linkage structure including a linkage, a lever, a catch and a jumper, the catch and the jumper being pivotally arranged on the lever, the linkage being connected between the jumper and the handle, the moving contact of the L-pole operating mechanism (580) and the N-pole operating mechanism (480) is each mounted on the lever or a contact support in driving cooperation with the lever, when the catch and the jumper are in snap-fit, the handle drives the moving contact to contact or separate from the stationary contact through the linkage structure.

18. The residual current circuit breaker according to claim 1, characterized in that: The residual current circuit breaker has a size of 36mm in the first direction.

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