Leakage protection module and leakage circuit breaker

Abstract

The invention discloses an electric leakage protection module and an electric leakage circuit breaker, and the module comprises a housing, a circuit board assembly, a zero sequence mutual inductor, a first auxiliary terminal, a first auxiliary insert nut, and a first auxiliary screw. The first auxiliary insert nut is embedded in the shell, one end of the first auxiliary insert nut is exposed outside the shell and connected with the first auxiliary screw, the other end of the first auxiliary insert nut is exposed in the inner cavity and electrically connected with the circuit board assembly, the first auxiliary terminal serves as a transmission carrier of a first electric signal, and the first auxiliary screw is used for external auxiliary circuit wiring; one end of the main line conductor assembly insert nut is exposed on the outer surface of the shell, and the other end of the main line conductor assembly insert nut is exposed in the inner cavity; the two ends of the connection conductor are electrically connected with the ends, located in the inner cavity, of the two insert nuts respectively, the two wiring screws are connected to the ends, exposed out of the shell, of the two insert nuts respectively, and the wiring screws are used for wiring of an external main circuit. The electric connector has the characteristics of simple wiring and good sealing effect.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, and in particular to a leakage protection module. Background Art

[0002] In the field of explosion-proof circuit breakers, users often have a need for leakage protection (or residual current protection). Existing explosion-proof circuit breakers add a small circuit breaker in an explosion-proof casing. If it wants to achieve leakage protection, it needs to use a leakage protection module adapted to the small circuit breaker. After the entire small circuit breaker is assembled, it is placed in the explosion-proof casing and then the external line wiring is performed.

[0003] However, as users' requirements for explosion-proof circuit breakers' performance increase, the original explosion-proof circuit breakers in the form of small circuit breakers can hardly meet such requirements. Therefore, an integrated explosion-proof circuit breaker is needed, but for this type of explosion-proof circuit breaker, it is obvious that the leakage protection module in the form of a small circuit breaker cannot be adapted to it.

[0004] Therefore, how to design a new type of leakage protection module to make it more suitable for explosion-proof circuit breakers is undoubtedly a question worth considering. Summary of the invention

[0005] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a leakage protection module and a leakage circuit breaker.

[0006] The present application provides: a leakage protection module, which includes: A housing having an inner cavity; A circuit board assembly is arranged in the inner cavity, and the circuit board assembly includes a leakage protection circuit. The leakage protection circuit samples the main line through a zero-sequence mutual inductor, and determines whether there is leakage according to the sampling information, and outputs a first electrical signal when there is leakage; The zero-sequence mutual inductor is electrically connected to the circuit board assembly and is a leakage sampling element in the leakage protection circuit. The zero-sequence mutual inductor has a central hole; The first auxiliary terminal includes a first auxiliary insert nut and a first auxiliary screw; the first auxiliary insert nut is embedded in the housing, one end of the first auxiliary insert nut is exposed outside the housing and connected to the first auxiliary screw, and the other end is exposed in the inner cavity and electrically connected to the circuit board assembly, the first auxiliary terminal serves as a transmission carrier of the first electrical signal, and the first auxiliary screw is used for external auxiliary line wiring; The main line conductor assembly is at least two groups, and each group of main line conductor assemblies includes two wiring screws, two insert nuts and a connecting conductor; the insert nut is embedded in the outer shell, one end is exposed on the outer surface of the outer shell, and the other end is exposed in the inner cavity; the connecting conductor passes through the center hole of the zero-sequence transformer, and the two ends of the connecting conductor are respectively electrically connected to one end of the two insert nuts located in the inner cavity, and the two wiring screws are respectively connected to one end of the two insert nuts exposed in the outer shell, and the wiring screws are used for external main line wiring.

[0007] In some embodiments of the present application, a circuit board bracket is also included, and the circuit board assembly includes a first circuit board and a second circuit board that are electrically connected to each other; in the height direction, the first circuit board is located above the zero-sequence transformer, and the first circuit board is fixed to the wall of the inner cavity; the circuit board bracket is located below the center line of the zero-sequence transformer in the height direction, and the second circuit board is fixed in the circuit board bracket.

[0008] In some embodiments of the present application, the first circuit board is fixed by a second fastening screw and a first auxiliary insert nut.

[0009] In some embodiments of the present application, the circuit board assembly includes a leakage test circuit, the leakage test circuit includes a test button and a mechanical switch assembly, the mechanical switch assembly is arranged on the first circuit board, the test button is slidingly arranged relative to the housing and one end passes through the housing and is exposed outside the housing, and the other end of the test button corresponds to the mechanical switch assembly.

[0010] In some embodiments of the present application, a second avoidance opening is provided on the second circuit board, and the zero-sequence mutual inductor is arranged in an alternating manner with the second circuit board through the second avoidance opening.

[0011] In some embodiments of the present application, a second auxiliary terminal is also included, including a second auxiliary insert nut and a second auxiliary screw. The second auxiliary insert nut is embedded in the shell, one end of which is exposed outside the shell and connected to the second auxiliary screw, and the other end of which is exposed in the inner cavity and electrically connected to the first circuit board and / or the second circuit board. The second auxiliary terminal is used to be connected to an external circuit, and the second auxiliary terminal serves as a transmission carrier for inputting a second electrical signal to the first circuit board and / or the second circuit board.

[0012] In some embodiments of the present application, a first avoidance opening is provided on the circuit board bracket, the zero-sequence transformer partially extends into the first avoidance opening, and the wall of the first avoidance opening is in contact with the zero-sequence transformer.

[0013] In some embodiments of the present application, in the height direction, the second circuit board is located lower than the main circuit conductor assembly, the bottom of the circuit board bracket has an assembly opening, and the second circuit board is placed in the circuit board bracket through the assembly opening.

[0014] In some embodiments of the present application, two terminal slots and two mounting slots are provided on the housing, each mounting slot is connected to a terminal slot, the wiring screws are arranged in the two mounting slots, and the terminal slots are used to place the wiring terminals.

[0015] In some embodiments of the present application, the outer shell includes a cover shell and a base plate, the inner cavity is in the cover shell, the bottom surface of the cover shell has a mounting port, the inner cavity opening is connected to the mounting port, the base plate is at least partially embedded in the mounting port to close the inner cavity opening, and the cover shell and the base plate are fastened by screws or riveted.

[0016] In some embodiments of the present application, the outer shell includes a cover shell and a base plate, the inner cavity is in the cover shell, the bottom surface of the cover shell has an installation port, the inner cavity opening is connected to the installation port, the base plate is at least partially embedded in the installation port to close the inner cavity opening, the cover shell is provided with a first ring-shaped structure surrounding the outside of the inner cavity opening, the base plate has a second ring-shaped structure, and the first ring-shaped structure and the second ring-shaped structure are staggered.

[0017] In some embodiments of the present application, the outer shell includes a cover shell and a bottom plate, the inner cavity is in the cover shell, the bottom surface of the cover shell has an installation port, the inner cavity opening is connected to the installation port, the bottom plate is at least partially embedded in the installation port to close the inner cavity opening, and a glue filling structure is arranged between the cover shell and the bottom plate, and the glue filling structure surrounds the inner cavity opening.

[0018] In some embodiments of the present application, an insulating bracket is further included, which cooperates with the zero-sequence transformer and is used to separate all the connecting conductors at least in the central hole of the zero-sequence transformer.

[0019] In some embodiments of the present application, a first guide structure is provided on the wall of the inner cavity, the first guide structure extends to the inner cavity opening along the height direction, a second guide structure is provided on the peripheral wall of the circuit board bracket, the second guide structure is consistent with the shape of the first guide structure, and the circuit board bracket is installed along the first guide structure through the second guide structure; in the length direction and the width direction, the circuit board bracket is limited by the second guide structure and the first guide structure; in the height direction, the circuit board bracket is clamped between the insulating bracket and the base plate.

[0020] In some embodiments of the present application, in the height direction, the upper end of the insulating bracket abuts against the wall of the inner cavity, the lower end of the insulating bracket abuts against the circuit board bracket, and the lower end of the circuit board bracket abuts against the bottom plate.

[0021] In some embodiments of the present application, a receiving groove is provided on the circuit board bracket, and the insulating bracket is partially inserted into the receiving groove.

[0022] In some embodiments of the present application, a first guide portion is provided on the wall of the inner cavity, and the first guide portion extends to the inner cavity opening along the height direction; a second guide portion is provided on the insulating bracket, and the first guide portion and the second guide portion are concave-convex matched to form a guide structure when the insulating bracket is installed.

[0023] In some embodiments of the present application, the insulating bracket includes a first sub-bracket and a second sub-bracket; the first sub-bracket is located on one side of the zero-sequence transformer, and the first sub-bracket has a first plug-in portion extending into the center hole of the zero-sequence transformer; the second sub-bracket is located on the other side of the zero-sequence transformer, and the second sub-bracket has a second plug-in portion extending into the center hole of the zero-sequence transformer; the first plug-in portion and the second plug-in portion are plug-fitted together, and after plug-in, the first sub-bracket and the second sub-bracket jointly separate all connecting conductors at least partially in the center hole of the zero-sequence transformer.

[0024] In some embodiments of the present application, the insulating bracket includes at least two groups of conductor mounting structures, and all conductor mounting structures adopt any one or a combination of the following two structures: Conductor installation structure 1, an installation hole is opened on the insulating bracket, the installation hole is opened along a first direction, the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer, the installation hole and the center hole of the zero-sequence transformer have an overlapping part, and the installation hole is for a connecting conductor to pass through; Conductor installation structure two, the insulating bracket includes a main body, two side branches are arranged on one side of the main body, the two side branches arranged on the same side of the main body are arranged at intervals in a first direction, the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer, the two side branches arranged on the same side of the main body and the main body jointly form an installation groove, a part of the installation groove is in the center hole of the zero-sequence transformer, each installation groove is provided with a connecting conductor, and the connecting conductor is arranged close to the groove wall of the installation groove.

[0025] A leakage circuit breaker, comprising the above-mentioned leakage protection module and a circuit breaker; the circuit breaker comprises a circuit breaker housing, in which at least two groups of main circuit conductors, an operating mechanism and a leakage release are arranged; each main circuit conductor comprises a first main circuit wiring terminal, each first main circuit wiring terminal corresponds to a wiring screw, and the two are electrically connected; the leakage release comprises a coil, a push rod and a coil terminal, and the coil, the coil terminal and the first auxiliary terminal are electrically connected; the operating mechanism comprises a locking assembly, and the locking assembly is located near the push rod; when leakage occurs in the main line, a first electrical signal is transmitted to the coil, so that the push rod is actuated to trigger the locking assembly to unlock, so that the operating mechanism performs a tripping operation.

[0026] The beneficial effects of this application include: First, the whole module is formed, and the user can determine whether to install it according to the needs. It is very convenient for the user to assemble and is very suitable for explosion-proof circuit breakers. Secondly, the main line conductor assembly adopts wiring screws and insert nuts to cooperate, which not only ensures that the wiring between the external main line is convenient, but also uses the insert nuts to improve the sealing performance of the wiring structure as much as possible. Finally, the leakage protection circuit uses the first auxiliary screw and the first auxiliary insert nut to realize the transmission of electrical signals, which not only ensures the convenience of wiring with the release circuit (the first electrical signal is supplied to the release), but also improves the sealing performance of the release circuit wiring structure as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A three-dimensional diagram of a leakage protection module according to Embodiment 1 of the present application is shown; Figure 2 A schematic diagram of the leakage protection module of Example 1 of the present application after the bottom plate is removed is shown; Figure 3 A rear view of the cover of Embodiment 1 of the present application is shown; Figure 4 A schematic diagram of a zero-sequence mutual inductor, a connecting conductor, a circuit board bracket, and a circuit board assembly in Embodiment 1 of the present application is shown; Figure 5 A schematic diagram of a second circuit board and a circuit board bracket according to Embodiment 1 of the present application is shown; Figure 6 A schematic diagram of a zero-sequence mutual inductor and a circuit board assembly according to Embodiment 1 of the present application is shown; Figure 7 A schematic diagram of a zero-sequence mutual inductor and a circuit board bracket in Embodiment 1 of the present application is shown; Figure 8 A schematic diagram of a circuit board bracket according to Embodiment 1 of the present application is shown; Fig. 9 A schematic diagram of the bottom plate of Example 1 of the present application is shown; Fig.10 It shows a cross-sectional view and an enlarged view of the staggered structure of the leakage protection module of Example 1 of the present application; Fig.11 A schematic diagram of a 14-pole main line conductor assembly according to an embodiment of the present application is shown; Fig.12A cross-sectional view of a main line conductor assembly of Embodiment 1 of the present application is shown; Fig.13 A top view of the leakage protection module of Example 1 of the present application is shown; Fig.14 A cross-sectional view of the first auxiliary terminal of Embodiment 1 of the present application is shown; Fig.15 A three-dimensional diagram of the first auxiliary terminal and the first circuit board of Embodiment 1 of the present application is shown; Fig.16 A position relationship diagram of a main line conductor assembly, a zero-sequence mutual inductor, and an insulating bracket in Embodiment 1 of the present application is shown; Fig.17 A schematic diagram of an insulating bracket according to Embodiment 1 of the present application is shown; Fig.18 A schematic diagram of a first sub-bracket and a second sub-bracket of Embodiment 1 of the present application is shown; Fig.19 A schematic diagram showing the cooperation between the insulating bracket and the second-shaped connecting conductor according to Embodiment 1 of the present application is shown; Fig. 20 A schematic diagram showing the cooperation between the insulating bracket and the first shape of the connecting conductor according to the first embodiment of the present application is shown; Fig.21 A schematic diagram showing a first shape of a connecting conductor in Example 1 of the present application is shown; Fig. 22 A schematic diagram showing a second shape of a connecting conductor in Example 1 of the present application is shown; Fig.23 A schematic diagram showing a connection conductor using a soft connection in Example 1 of the present application is shown; Fig.24 A schematic diagram showing the connection of the conductors using a soft connection and a wiring piece in Example 1 of the present application is shown; Fig.25 A three-dimensional diagram of a residual current circuit breaker according to Embodiment 1 of the present application is shown; Fig.26 A cross-sectional view of the residual current circuit breaker according to Embodiment 1 of the present application is shown. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "primary" and "secondary" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, when a main feature is “above” or “below” a second feature, it can mean that the main feature and the second feature are in direct contact, or the main feature and the second feature are in indirect contact through an intermediate medium. Moreover, when a main feature is “above”, “above” or “above” a second feature, it can mean that the main feature is directly above or obliquely above the second feature, or simply means that the main feature is higher in level than the second feature. When a main feature is “below”, “below” or “below” a second feature, it can mean that the main feature is directly below or obliquely below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0034] like Figure 1-Figure 24 As shown, an embodiment of the present application provides a leakage protection module. This zero-sequence transformer 2-00 is used in conjunction with a circuit breaker. When connected to a line, it can effectively identify whether there is leakage current in the line.

[0035] The leakage protection module includes: The housing includes a cover 1-101 and a bottom plate 1-102. The cover 1-101 has an inner cavity 1-103, and components such as a zero-sequence transformer 2-00, an insulating bracket 5-100, and a circuit board assembly 4-00 are arranged in the inner cavity 1-103. The bottom surface of the cover 1-101 has an installation opening 1-104, and the inner cavity opening is connected to the installation opening 1-104, so that the components in the inner cavity 1-103 can be installed into the inner cavity 1-103 from the installation opening 1-104.

[0036] The installation opening 1-104 is provided on the bottom surface of the housing 1-101, so that the internal components can be loaded into the inner cavity through the installation opening 1-104. At the same time, the installation opening 1-104 is provided, so that the housing 1-101 can have as few holes as possible in other places (except for some holes required for insert nuts, first auxiliary insert nuts, and test buttons, and the rest of the places can have as few holes as possible), ensuring the overall sealing performance and being more suitable for the field of explosion-proof circuit breakers.

[0037] The bottom plate 1-102 is at least partially embedded in the mounting opening 1-104, so that the bottom plate 1-102 can close the opening of the inner cavity 1-103. The bottom plate 1-102 and the housing 1-101 are fixed by screws, but can also be fixed by riveting.

[0038] As for the bottom plate 1-102, it extends a circle of second ring-shaped structure 1-105 toward the cover shell 1-101, and the second ring-shaped structure 1-105 surrounds the periphery of the inner cavity opening. Similarly, the cover shell 1-101 has a circle of first ring-shaped structure 1-106 surrounding the outside of the inner cavity opening. After the bottom plate 1-102 and the cover shell 1-101 are installed, the first ring-shaped structure 1-106 and the second ring-shaped structure 1-105 are staggered with each other, so that a circle of staggered structure is formed on the periphery of the inner cavity opening, which improves the sealing performance and makes the entire module more suitable for the field of explosion-proof circuit breakers.

[0039] Here, since the first ring-shaped structure 1-106 surrounds the inner cavity opening, a groove-shaped structure is formed on the side of the first ring-shaped structure 1-106 away from the inner cavity opening, and glue can be poured into the groove-shaped structure to form a glue pouring structure, and this glue pouring is formed between the bottom plate 1-102 and the cover 1-101 (surrounding the inner cavity opening), further improving the sealing performance. Of course, the groove-shaped structure required for the glue pouring structure here may not be formed by the first ring-shaped structure 1-106, for example, a groove-shaped structure for glue pouring is separately opened on the cover 1-101.

[0040] The circuit board assembly 4-00 is arranged in the inner cavity 1-103. The circuit board assembly 4-00 here has a leakage protection circuit inside, and the zero-sequence mutual inductor 2-00 is electrically connected to the circuit board assembly 4-00 as a leakage adopting element of the leakage protection circuit. When the sampling information collected by the zero-sequence mutual inductor 2-00 meets the leakage situation (reaching the threshold), the leakage protection circuit will cause the leakage releaser to trip, that is, output the first electrical signal. Here, the circuit principle of the leakage protection circuit is common knowledge. The present application does not improve the circuit principle of the leakage protection circuit, but only improves the transmission carrier of the first electrical signal (that is, the wiring method). Therefore, the circuit principle of the leakage protection circuit will not be repeated here.

[0041] The first auxiliary terminal, as a transmission carrier of the first electrical signal, includes a first auxiliary insert nut 4-01 and a first auxiliary screw 4-02. The first auxiliary insert nut 4-01 is embedded in the housing 1-101, one end of the first auxiliary insert nut 4-01 is exposed outside the housing and connected to the first auxiliary screw 4-02, and the other end of the first auxiliary insert nut 4-01 is exposed in the inner cavity 1-103. The circuit board assembly 4-00 is electrically connected to the end of the first auxiliary insert nut 4-01 exposed in the inner cavity 1-103.

[0042] With such a structure, the circuit of the leakage release of the circuit breaker can be connected to the first auxiliary screw 4-02, so that the electrical signal of the leakage protection circuit can be transmitted to the leakage release (circuit breaker), thereby achieving the effect of leakage release. Such a wiring structure can undoubtedly also have a better sealing effect. Here, the number of the first auxiliary terminals is two, because the lead wires of the leakage release are two.

[0043] Here, the circuit board assembly includes a first circuit board 4-1 and a second circuit board 4-2, and the two circuit boards are electrically connected (for example, by wire welding or by connecting with a connector). From the height direction of the entire module, the first circuit board 4-1 is higher than the zero-sequence transformer 2-00, and is fixed by the first circuit board 4-1 and the wall of the inner cavity 1-103. The second circuit board 4-2 is fixed in the circuit board bracket 4-3, and the circuit board bracket 4-3 is located below the center line P of the height direction of the zero-sequence transformer 2-00.

[0044] Such a height arrangement of the first circuit board 4-1 and the second circuit board 4-2 makes the best use of the space inside the housing 1-101, which can make the overall volume more compact. The first circuit board 4-1 is arranged higher than the zero-sequence transformer 2-00, which can make it farther away from the center hole of the zero-sequence transformer 2-00, and increase the electrical clearance between it and the main line conductor assembly 3-00 passing through the center hole. The arrangement of the circuit board bracket 4-3 will be conducive to the fixation of the second circuit board 4-2, and is also conducive to separating the main line conductor assembly 3-00 of the center hole of the zero-sequence transformer 2-00 from the second circuit board 4-2 (increasing the creepage distance), and making the overall height direction more compact while ensuring that the second circuit board 4-2 has sufficient creepage distance.

[0045] The first circuit board 4-1 here is used to complete the electrical connection with the first auxiliary insert nut 4-01. It is specifically achieved through the second fastening screw 4-11, that is, the second fastening screw 4-11 directly fixes the first circuit board 4-1 on the first auxiliary insert nut 4-01, which not only ensures the stable installation of the first circuit board 4-1, but also ensures the electrical connection between the first circuit board 4-1 and the first auxiliary insert nut 4-01. Two functions are achieved through fewer parts, which is conducive to reducing the parts of the product and making the structure more compact. Of course, in addition to this connection method here, for example, the first circuit board 4-1 can also be fastened to the wall of the inner cavity 1-103 by screws, and then electrically connected to the first auxiliary insert nut 4-01 by contacting with leads or conductors.

[0046] Here, the circuit board assembly includes a leakage test circuit, which is a conventional circuit, that is, the user can simulate a leakage current through the leakage test circuit, and then judge the quality of the leakage function according to whether the circuit breaker is tripped. The present application does not improve the principle of the leakage test circuit, but improves the position of the leakage test circuit test button 4-13 and the mechanical switch assembly 4-12, so the principle of the leakage test circuit will not be described in detail. The mechanical switch assembly 4-12 is fixed on the first circuit board 4-1. The mechanical switch assembly 4-12 here includes a moving contact and a static contact. Of course, the mechanical switch assembly 4-12 here can also adopt a micro switch. The test button 4-13 is above the moving contact, and the test button 4-13 is slidably arranged relative to the cover 1-101, and one end exceeds the cover 1-101. The user can press the test button 4-13 to make the moving and static contacts contact, so that the leakage test circuit is connected to generate a simulated leakage current. The positions of the test button 4-13 and the mechanical switch assembly 4-12 make the best use of the space on the cover 1-101. Meanwhile, the extended position of the test button 4-13 (the upper surface of the cover 1-101) is also conducive to user operation.

[0047] Such a test button 4-13 can also be installed using an insert nut with a through hole (embedded in the cover 1-101, with both ends exposed outside the inner cavity 1-103 and the cover 1-101 respectively). The test button 4-13 is inserted into this insert nut, which can also ensure the sealing performance.

[0048] From the height direction of the leakage protection module, the second circuit board 4-2 is located lower than the main line conductor assembly 3-00. The bottom of the circuit board bracket 4-3 has an assembly port 4-30, and the second circuit board 4-2 is placed in the circuit board bracket 4-3 through the assembly port 4-30. Such a second circuit board 4-2 and the assembly method enable the circuit board bracket 4-3 to be separated between the second circuit board 4-2 and the main line conductor assembly 3-00, thereby increasing the creepage distance.

[0049] A second avoidance opening 4-20 is provided on the second circuit board 4-2, and the zero-sequence transformer 2-00 is arranged in an alternating manner with the second circuit board 4-2 through the second avoidance opening 4-20.

[0050] The purpose of such a setting is to make the overall structure of the zero-sequence transformer 2-00 and the second circuit board 4-2 more compact and reduce excessive space occupation (the space occupied by the two after being staggered will be smaller than that of the non-staggered structure).

[0051] A first avoidance opening 4-31 is provided on the circuit board bracket 4-3, and a portion of the zero-sequence transformer 2-00 extends into the first avoidance opening 4-31, and a wall of the first avoidance opening 4-31 fits with the zero-sequence transformer 2-00.

[0052] The purpose of such a setting is to make the overall structure of the zero-sequence transformer 2-00 and the circuit board bracket 4-3 more compact and reduce the excessive space occupation (the space occupied by the two after interlacing will be smaller than the non-interlaced structure). At the same time, the wall of the first avoidance opening 4-31 fits the zero-sequence transformer 2-00, so that the zero-sequence transformer 2-00 can be placed on the first avoidance opening 4-31, so that when the whole is assembled, it can be inserted into the inner cavity 1-103 together, which is convenient for assembly.

[0053] The zero-sequence transformer 2-00 is arranged in the inner cavity 1-103 and has a center hole 2-01. Its center hole 2-01 is provided for all connecting conductors 3-03 to pass through.

[0054] The number of main line conductor assemblies 3-00 is at least two groups. In this embodiment, four groups are used, specifically corresponding to a 4-pole circuit breaker. Regardless of which group of main line conductor assemblies 3-00, it includes two wiring screws, two insert nuts and a connecting conductor 3-03. For the convenience of distinguishing and introducing, the two wiring screws are respectively the first screw 3-01 and the second screw 3-04, and the two insert nuts are respectively the first insert nut 3-02 and the second insert nut 3-05.

[0055] Among these components, the first insert nut 3-02 and the second insert nut 3-05 are embedded in the cover shell 1-101, and one end of the first insert nut 3-02 and the second insert nut 3-05 are exposed on the surface of the cover shell 1-101 (exposed on the surface here includes protruding from the surface, being flush with the surface, and being below the surface).

[0056] Among these components, the connecting conductors 3-03 are all arranged in the inner cavity 1-103, and all the connecting conductors 3-03 pass through the central hole 2-01 of the zero-sequence transformer 2-00. One end of the connecting conductor 3-03 is electrically connected to the corresponding first insert nut 3-02 (the end of the first insert nut 3-02 exposed in the inner cavity 1-103), and the other end of the connecting conductor 3-03 is electrically connected to the corresponding second insert nut 3-05 (the end of the second insert nut 3-05 exposed in the inner cavity 1-103). There are many electrical connection methods here. In this embodiment, screw fastening is adopted. In addition, welding fixation, riveting fixation, etc. can also be adopted.

[0057] The first screw 3-01 is located outside the housing 1-101 and connected to the first insert nut 3-02 (the first insert nut 3-02 is exposed at one end of the housing 1-101). The second screw 3-04 is located outside the housing 1-101 and connected to the second insert nut 3-05 (the first insert nut 3-02 is exposed at one end of the housing 1-101). With this structure, the external circuit can be connected through the first screw 3-01 and the second screw 3-04.

[0058] The first screw 3-01 and the second screw 3-04 are more suitable for connecting external lines with wiring lugs. The main line conductor assembly 3-00 formed by the insert nut can make the sealing performance of the wiring structure better and is more suitable for the field of explosion-proof circuit breakers.

[0059] In order to enrich the types of wiring, two terminal slots and two mounting slots are provided on the cover 1-101, each mounting slot is connected to a terminal slot, the wiring screws are arranged in the two mounting slots, and the terminal slots are used to place the wiring terminals. For the convenience of introduction, the two terminal slots are respectively the first terminal slot 1-107 and the second terminal slot 1-110, the two mounting slots are respectively the first mounting slot 1-108 and the second mounting slot 1-111, and the two wiring terminals are respectively the first wiring terminal 1-109 and the second wiring terminal 1-112.

[0060] The cover 1-101 is provided with a first terminal slot 1-107 and a first mounting slot 1-108. The first terminal slot 1-107 is located on one side of the first terminal slot 1-107 (one side in the length direction of the cover 1-101), and the first screw 3-01 here is in the first mounting slot 1-108 (it can also be said that one end of the first insert nut 3-02 is exposed in the first mounting slot 1-108). The first terminal slot 1-107 here is used to place the first wiring terminal 1-109, and the first wiring terminal 1-109 can be a screw-type wiring terminal or a cage-type wiring terminal. In this way, the user can electrically connect the first wiring terminal 1-109 to the first screw 3-01 (using a soft wire or a wiring piece) according to the needs, and then connect the external circuit to the first wiring terminal 1-109.

[0061] The cover 1-101 is provided with a second terminal slot 1-110 and a second mounting slot 1-111. The second terminal slot 1-110 is located on one side of the second terminal slot 1-110, and the second screw 3-04 is located in the second mounting slot 1-111. The second terminal slot 1-110 is used to place the second wiring terminal 1-112, and the second wiring terminal 1-112 can be a screw-type wiring terminal or a cage-type wiring terminal. In this way, the user can electrically connect the second wiring terminal 1-112 with the second screw 3-04 (using a soft wire or a wiring piece) according to the needs, and then connect the external circuit to the second wiring terminal 1-112.

[0062] When the first terminal 1-109 and the second terminal 1-112 are set, the first screw 3-01, the second screw 3-04, the first insert nut 3-02 and the second insert nut 3-05 act as a transfer structure, which can enrich the user's wiring methods.

[0063] There are various ways to form the connecting conductor 3-03, which can be a pure soft connection, a pure hard connection, or a combination of a soft connection and a hard connection.

[0064] like Figure 21-22As shown, the connecting conductor 3-03 is an integrally formed hard busbar, and the two ends of the connecting conductor 3-03 are respectively fixed by fasteners to one end of the first insert nut 3-02 located in the inner cavity 1-103 and one end of the second insert nut 3-05 located in the inner cavity 1-103. As an alternative, the connecting conductor 3-03 may not be integrally formed, for example, it may be a hard busbar assembly formed by at least two independently formed hard busbar sub-components, which are then fixed by rivets, bolts, or welding.

[0065] like Fig.24 As shown, the connecting conductor 3-03 is a soft connection, and connecting plates are welded at both ends of the connecting conductor 3-03. The two connecting plates are fixed to one end of the first insert nut 3-02 located in the inner cavity 1-103 and one end of the second insert nut 3-05 located in the inner cavity 1-103 through fasteners.

[0066] like Fig.23 As shown, the connecting conductor 3-03 is a soft connection, and the two ends of the connecting conductor 3-03 are respectively welded and fixed to one end of the first insert nut 3-02 located in the inner cavity 1-103 and one end of the second insert nut 3-05 located in the inner cavity 1-103.

[0067] The parts of all connecting conductors 3-03 that penetrate into the zero-sequence transformer 2-00 are separated by insulating brackets 5-100.

[0068] The insulating bracket 5-100 here can not only separate the main line conductor component 3-00, but also achieve the assembly effect together with the circuit board bracket 4-3.

[0069] That is, in the height direction, the upper end of the insulating bracket 5-100 abuts against the wall of the inner cavity 1-103, the lower end of the insulating bracket 5-100 abuts against the circuit board bracket 4-3, and the lower end of the circuit board bracket 4-3 abuts against the bottom plate 1-102. Such abutting relationship can effectively ensure the stable installation of these internal components.

[0070] A first guide portion 1-1031 is provided on the wall of the inner cavity 1-103, and the first guide portion 1-1031 extends to the opening of the inner cavity 1-103 in the height direction; a second guide portion 5-1001 is provided on the insulating bracket 5-100, and the first guide portion 1-1031 and the second guide portion 5-1001 are matched in a concave-convex manner to form a guide structure when the insulating bracket 5-100 is installed. Here, the first guide portion 1-1031 is a groove, and the second guide portion 5-1001 is a convexity; in addition, the structure can also be swapped. In this way, the arrangement of the first guide portion 1-1031 and the second guide portion 5-1001 can make the installation of the insulating bracket 5-100 very convenient. It is only necessary to align the first guide portion 1-1031 with the second guide portion 5-1001 and push the insulating bracket 5-100 in, thereby ensuring the rapid assembly of the assembly formed by the zero-sequence mutual inductor, the insulating bracket 5-100, and the connecting conductor.

[0071] A first guide structure 1-1032 is provided on the wall of the inner cavity 1-103, and the first guide structure 1-1032 extends to the opening of the inner cavity 1-103 in the height direction. A second guide structure 4-32 is provided on the peripheral wall of the circuit board bracket 4-3, and the second guide structure 4-32 matches the shape of the first guide structure 1-1032. The circuit board bracket 4-3 is installed along the first guide structure 1-1032 through the second guide structure 4-32. Here, the first guide structure 1-1032 is a shape formed by the cooperation of a groove and a protrusion, and the second guide structure 4-32 matches it. When installing, it is only necessary to align the second guide structure 4-32 of the circuit board bracket 4-3 with the first guide structure 1-1032, and then push the circuit board bracket 4-3 into place. Such an installation method of the first guide structure 1-1032 and the second guide structure 4-32 is very convenient and conducive to quick assembly. In this way, in the length and width directions of the leakage protection module, the circuit board bracket 4-3 is limited by the second guide structure 4-32 and the first guide structure 1-1032; in the height direction of the leakage protection module, the circuit board bracket 4-3 is clamped between the insulating bracket 5-100 and the bottom plate 1-102; this ensures the stability of the overall installation. Of course, the shapes of the above-mentioned guide structures are various, not limited to the combination of grooves and protrusions, for example, the combination of multiple grooves is also possible, as long as the positioning and installation between the circuit boards can be guaranteed.

[0072] A receiving groove 4-33 is provided on the circuit board support 4-3, and the insulating support 5-100 is partially inserted into the receiving groove 4-33. Such a structural arrangement enables the circuit board support 4-3 and the insulating support 5-100 to form a certain limiting structure to ensure the stability of the overall installation.

[0073] The following is an introduction to the 5-100 partition of the insulating bracket which is relatively easy to install.

[0074] This insulating bracket 5-100 includes a first sub-bracket 5-101 and a second sub-bracket 5-102.

[0075] The first sub-bracket 5-101 is located on one side of the zero-sequence transformer 2-00 (one side in the axial direction of the center hole 2-01), and the first sub-bracket 5-101 has a first plug-in portion 5-103 extending into the center hole 2-01 of the zero-sequence transformer 2-00. The second sub-bracket 5-102 is located on the other side of the zero-sequence transformer 2-00 (the other side in the axial direction of the center hole 2-01), and the second sub-bracket 5-102 has a second plug-in portion 5-104 extending into the center hole 2-01 of the zero-sequence transformer 2-00. The first plug-in portion 5-103 and the second plug-in portion 5-104 are plugged together to form a stable structure, so that the first sub-bracket 5-101 and the second sub-bracket 5-102 after plugging together separate all the connecting conductors 3-03 at least in the center hole 2-01 of the zero-sequence transformer 2-00.

[0076] The insulating bracket 5-100 of this assembly method has a very convenient installation structure. Here, in order to reduce the number of production molds and materials, the first sub-bracket 5-101 and the second sub-bracket 5-102 can be made into completely identical structures and can be plugged into each other.

[0077] The insulating bracket 5-100 has two types of conductor mounting structures, which are suitable for two connecting conductors 3-03 of different shapes.

[0078] The first type of mounting structure is a mounting hole 5-105a. The mounting hole 5-105a here is opened on the insulating bracket 5-100 and is opened along the first direction F1. The first direction F1 here is parallel to the axial direction of the center hole 2-01 of the zero-sequence transformer 2-00. The mounting hole 5-105a and the center hole 2-01 of the zero-sequence transformer 2-00 have an overlapping portion. The mounting hole 5-105a here is opened on the first sub-bracket 5-101 and the second sub-bracket 5-102 at the same time, so that the two can form a complete mounting hole 5-105a after cooperation.

[0079] This type of installation structure is suitable for the first shape of the connecting conductor 3-03. The first shape of the connecting conductor 3-03, taking the hard busbar structure as an example, includes a first end 3-031, a penetration portion 3-032a and a second end 3-033. The first end 3-031 and the second end 3-033 are both arranged perpendicular to the penetration portion 3-032a. The first end 3-031 is used to be fastened with the first insert nut 3-02 by screws, and the second end 3-033 is used to be fastened with the second insert nut 3-05 by screws. The penetration portion 3-032a passes through the center hole 2-01 of the zero-sequence transformer 2-00.

[0080] For this type of mounting structure, in order to facilitate its installation with the insulating bracket 5-100, from the first direction F1, the shape formed by the first end 3-031 and the penetration portion 3-032a, and the shape formed by the second end 3-033 and the penetration portion 3-032a are overlapped, that is, roughly L-shaped. An L-shaped mounting through hole 5-105 (mounting hole 5-105a is a part of it) is provided on the insulating bracket 5-100, and the L-shaped mounting through hole 5-105 is also provided along the first direction F1, and during installation, this type of connecting conductor 3-03 can pass through it along the first direction F1.

[0081] The second type of mounting structure is a mounting groove 5-106. The insulating bracket 5-100 here includes a main body (the first plug-in portion 5-103 and the second plug-in portion 5-104 are both part of the main body), and two side branches 5-107 are arranged on both sides of the main body (the first sub-bracket 5-101 and the second sub-bracket 5-102 each have one), and the two sides here refer to the second direction F2, that is, the direction perpendicular to the first direction F1. The two side branches 5-107 arranged on the same side of the main body are arranged at intervals in the first direction F1, and the two side branches 5-107 arranged on the same side of the main body together with the main body form a mounting groove 5-106, and a part of the mounting groove 5-106 is in the center hole 2-01 of the zero-sequence transformer 2-00, and the mounting groove 5-106 formed in this way has its opening direction facing the second direction F2.

[0082] This type of installation structure is suitable for the second shape of the connecting conductor 3-03. Taking the hard busbar as an example, the second shape of the connecting conductor 3-03 includes a first end 3-031, a U-shaped penetration portion 3-032b and a second end 3-033. The U-shaped penetration portion 3-032b includes a middle portion 3-032b1 and two side portions 3-032b2, the middle portion 3-032b1 is used to pass through the center hole 2-01 of the zero-sequence transformer 2-00, and the two side portions 3-032b2 are respectively arranged perpendicular to the first end 3-031 and the second end 3-033. After the connecting conductor 3-03 of this shape is assembled with the insulating bracket 5-100, the two side portions 3-032b2 are respectively located at the parts of the installation groove 5-106 located on the two side branches 5-107, and the middle portion 3-032b1 is located at the part of the installation groove 5-106 located on the main body. The connecting conductor 3-03 is generally arranged close to the groove wall of the installation groove 5-106.

[0083] Of course, the above examples only illustrate the shape of the connecting conductor 3-03 and the corresponding installation structure. You can set it arbitrarily according to actual needs: Taking the 4-pole leakage protection module as an example, it has two connecting conductors 3-03 of the first shape and two connecting conductors 3-03 of the second shape, and the corresponding number of mounting holes 5-105a and mounting grooves 5-106 are both two.

[0084] Taking the 3-pole leakage protection module as an example, it can have two connecting conductors 3-03 of the first shape and one connecting conductor 3-03 of the second shape, and the corresponding number of mounting holes 5-105a is two, and the number of mounting slots 5-106 is two; it can also have two connecting conductors 3-03 of the second shape and one connecting conductor 3-03 of the first shape, and the corresponding number of mounting slots 5-106 is two, and the number of mounting holes 5-105a is two. Of course, this 3-pole leakage protection module can also use the mounting bracket of the 4-pole leakage protection module, as long as one of the mounting holes 5-105a or one of the mounting slots 5-106 is not installed with a connecting conductor 3-03.

[0085] Taking the 2-pole leakage protection module as an example, it can have two different conductor shapes and two different installation structures at the same time; it can also have only the first shape of the connecting conductor 3-03 and the corresponding installation structure (installation hole 5-105a method); it can also have only the second shape of the connecting conductor 3-03 and the corresponding installation structure (installation slot 5-106 method). Of course, this 3-pole leakage protection module can also use the installation bracket of the 4-pole leakage protection module, as long as two of the installation holes 5-105a and the installation slot 5-106 are not installed with the connecting conductor 3-03.

[0086] In order to enable external input of signals, a second auxiliary terminal is also included. In this embodiment, the structure of the second auxiliary terminal is similar to the installation structure of the first auxiliary terminal. The second auxiliary terminal includes a second auxiliary insert nut 4-01a and a second auxiliary screw 4-02a. The second auxiliary insert nut 4-01a is embedded in the housing 1-101, one end of which is exposed outside the housing 1-101 and connected to the second auxiliary screw 4-02a, and the other end of which is exposed in the inner cavity 1-103 and fastened to the first circuit board 4-1, also forming an electrical connection.

[0087] Here, the second auxiliary terminal mainly plays the role of signal transmission between the external auxiliary circuit and the circuit board assembly. The external auxiliary circuit can input the second electrical signal to the circuit board assembly. For example, when an external test button is provided on the distribution box or the distribution cabinet, the auxiliary circuit of the external test button can send a simulated leakage current to the circuit board assembly through the second auxiliary terminal. At this time, the second electrical signal is the simulated leakage current. Of course, the second electrical signal here is not limited to the simulated leakage current, it can also be an electrical signal with some other functions.

[0088] Here, the number of the second auxiliary terminals is two Of course, the second auxiliary terminal here can also be changed to be electrically connected to the second circuit board.

[0089] For the structure used in the leakage circuit breaker, Figure 25-26 As shown, the leakage circuit breaker of this structure includes an upper leakage protection module and a circuit breaker.

[0090] The leakage protection module here has the same number of poles as the circuit breaker (the number of main line conductor assemblies and main loop conductors).

[0091] Taking a four-pole circuit breaker as an example, the circuit breaker includes a circuit breaker housing 6-00, in which four sets of main circuit conductors, an operating mechanism and a leakage release are arranged.

[0092] The four groups of main circuit conductors all include the first main circuit terminal 6-01. The first main circuit terminal 6-01 here adopts a screw-type terminal (in addition, a cage-type terminal can also be used). The first main circuit terminal 6-01 and the conductor inside the circuit breaker (the part where the main circuit conductor is inside) are also connected by means of an insert nut, which can also have a good sealing effect. The first main circuit terminal 6-01 is electrically connected to the first screw 3-01 of the leakage protection module. A wiring lug is used here, and of course, a soft wire can also be used. With such an electrical connection, as long as the second screw and another terminal of the circuit breaker are connected to the load circuit, it is possible to ensure that the leakage protection circuit breaker is connected to the load circuit.

[0093] The operating mechanism includes a closing state and an opening state. In the closing state, the locking component 6-02 is used to maintain the closing position. If the locking component 6-02 is triggered at this time, the operating mechanism will be opened (that is, the operating mechanism drives the moving and static contacts in the main circuit conductor to separate).

[0094] The leakage release includes a coil, a top rod 6-03 and a coil terminal 6-04. The top rod 6-03 is its actuating rod. The release adopts the electromagnet principle (the specific structure of the electromagnet principle is a conventional method in the art). The top rod 6-03 is arranged near the lock assembly 6-02. When the leakage release is actuated, the top rod 6-03 triggers the lock assembly 6-02, causing the operating mechanism to perform the opening.

[0095] The coil of the leakage release is electrically connected to the first auxiliary terminal (first auxiliary screw 4-02) through the coil terminal 6-04, for example, through a wiring piece or a lead. In this way, when leakage occurs, the first electrical signal can be transmitted to the coil, so that the leakage release is actuated. The coil terminal 6-04 here can be connected to the coil in a manner similar to the first auxiliary terminal, or can be a common wiring terminal, or in the form of a connector.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0097] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A leakage protection module, characterized in that: include, A housing having an inner cavity; A circuit board assembly is arranged in the inner cavity, and the circuit board assembly includes a leakage protection circuit. The leakage protection circuit samples the main line through a zero-sequence mutual inductor, and determines whether there is leakage according to the sampling information, and outputs a first electrical signal when there is leakage; The zero-sequence mutual inductor is electrically connected to the circuit board assembly and is a leakage sampling element in the leakage protection circuit. The zero-sequence mutual inductor has a central hole; The first auxiliary terminal includes a first auxiliary insert nut and a first auxiliary screw; the first auxiliary insert nut is embedded in the housing, one end of the first auxiliary insert nut is exposed outside the housing and connected to the first auxiliary screw, and the other end is exposed in the inner cavity and electrically connected to the circuit board assembly, the first auxiliary terminal serves as a transmission carrier of the first electrical signal, and the first auxiliary screw is used for external auxiliary line wiring; The main line conductor assembly is at least two groups, and each group of main line conductor assemblies includes two wiring screws, two insert nuts and a connecting conductor; the insert nut is embedded in the outer shell, one end is exposed on the outer surface of the outer shell, and the other end is exposed in the inner cavity; the connecting conductor passes through the center hole of the zero-sequence transformer, and the two ends of the connecting conductor are respectively electrically connected to one end of the two insert nuts located in the inner cavity, and the two wiring screws are respectively connected to one end of the two insert nuts exposed in the outer shell, and the wiring screws are used for external main line wiring.

2. A leakage protection module according to claim 1, characterized in that: It also includes a circuit board bracket, and the circuit board assembly includes a first circuit board and a second circuit board that are electrically connected to each other; in the height direction, the first circuit board is located above the zero-sequence transformer, and the first circuit board is fixed to the wall of the inner cavity; the circuit board bracket is located below the center line of the zero-sequence transformer in the height direction, and the second circuit board is fixed in the circuit board bracket.

3. A leakage protection module according to claim 2, characterized in that: The first circuit board is fixed by a second fastening screw and a first auxiliary insert nut; And / or, the circuit board assembly includes a leakage test circuit, the leakage test circuit includes a test button and a mechanical switch assembly, the mechanical switch assembly is arranged on the first circuit board, the test button is slidably arranged relative to the housing and one end of the test button passes through the housing and is exposed outside the housing, and the other end of the test button corresponds to the mechanical switch assembly; And / or, a second avoidance opening is provided on the second circuit board, and the zero-sequence mutual inductor is arranged in an alternating manner with the second circuit board through the second avoidance opening; And / or, a first avoidance opening is provided on the circuit board bracket, the zero-sequence mutual inductor partially extends into the first avoidance opening, and the wall of the first avoidance opening is in contact with the zero-sequence mutual inductor; And / or, in the height direction, the second circuit board is located lower than the main circuit conductor assembly, the bottom of the circuit board support has an assembly opening, and the second circuit board is placed in the circuit board support through the assembly opening; And / or, the housing is provided with two terminal slots and two mounting slots, each mounting slot is connected to a terminal slot, the wiring screws are arranged in the two mounting slots, and the terminal slots are used to place the wiring terminals; And / or, it also includes a second auxiliary terminal, including a second auxiliary insert nut and a second auxiliary screw, the second auxiliary insert nut is embedded in the shell, one end of the second auxiliary insert nut is exposed outside the shell and connected to the second auxiliary screw, and the other end is exposed in the inner cavity and electrically connected to the first circuit board and / or the second circuit board, the second auxiliary terminal is used to connect to the external circuit, and the second auxiliary terminal serves as a transmission carrier for inputting the second electrical signal to the first circuit board and / or the second circuit board.

4. The leakage protection module according to claim 2, characterized in that: The housing comprises a cover shell and a bottom plate, the inner cavity is in the cover shell, the bottom surface of the cover shell has a mounting opening, the inner cavity opening is communicated with the mounting opening, the bottom plate is at least partially embedded in the mounting opening to close the inner cavity opening, and the cover shell and the bottom plate are fastened by screws or riveted; And / or, the housing includes a cover shell and a bottom plate, the inner cavity is in the cover shell, the bottom surface of the cover shell has a mounting opening, the inner cavity opening is communicated with the mounting opening, the bottom plate is at least partially embedded in the mounting opening to close the inner cavity opening, the cover shell is provided with a first ring-shaped structure surrounding the outer portion of the inner cavity opening, the bottom plate has a second ring-shaped structure, and the first ring-shaped structure and the second ring-shaped structure are staggered; And / or, the outer shell includes a cover shell and a bottom plate, the inner cavity is in the cover shell, the bottom surface of the cover shell has a mounting port, the inner cavity opening is connected to the mounting port, the bottom plate is at least partially embedded in the mounting port to close the inner cavity opening, and a glue filling structure is arranged between the cover shell and the bottom plate, and the glue filling structure surrounds the inner cavity opening.

5. A leakage protection module according to claim 4, characterized in that: It also includes an insulating bracket, which cooperates with the zero-sequence transformer and is used to separate all the connecting conductors at least in the central hole of the zero-sequence transformer.

6. A leakage protection module according to claim 5, characterized in that: A first guide structure is provided on the wall of the inner cavity, and the first guide structure extends to the inner cavity opening along the height direction. A second guide structure is provided on the peripheral wall of the circuit board bracket, and the second guide structure matches the shape of the first guide structure. The circuit board bracket is installed along the first guide structure through the second guide structure; in the length direction and the width direction, the circuit board bracket is limited by the second guide structure and the first guide structure; in the height direction, the circuit board bracket is clamped between the insulating bracket and the base plate.

7. The leakage protection module according to claim 4, characterized in that: In the height direction, the upper end of the insulating bracket abuts against the wall of the inner cavity, the lower end of the insulating bracket abuts against the circuit board bracket, and the lower end of the circuit board bracket abuts against the bottom plate; Or / and, a receiving groove is provided on the circuit board bracket, and the insulating bracket part is inserted into the receiving groove; And / or, a first guide portion is provided on the wall of the inner cavity, and the first guide portion extends to the inner cavity opening along the height direction; a second guide portion is provided on the insulating bracket, and the first guide portion and the second guide portion are matched in a concave-convex manner to form a guide structure when the insulating bracket is installed.

8. The leakage protection module according to claim 4, characterized in that: The insulating bracket includes a first sub-bracket and a second sub-bracket; the first sub-bracket is located on one side of the zero-sequence transformer, and the first sub-bracket has a first plug-in portion extending into the center hole of the zero-sequence transformer; the second sub-bracket is located on the other side of the zero-sequence transformer, and the second sub-bracket has a second plug-in portion extending into the center hole of the zero-sequence transformer; the first plug-in portion and the second plug-in portion are plug-fitted, and after plug-in, the first sub-bracket and the second sub-bracket jointly separate all connecting conductors at least partially in the center hole of the zero-sequence transformer.

9. The leakage protection module according to claim 4, characterized in that: The insulating bracket includes at least two sets of conductor mounting structures, and all conductor mounting structures adopt any one or a combination of the following two structures: Conductor installation structure 1, an installation hole is opened on the insulating bracket, the installation hole is opened along a first direction, the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer, the installation hole and the center hole of the zero-sequence transformer have an overlapping part, and the installation hole is for a connecting conductor to pass through; Conductor installation structure two, the insulating bracket includes a main body, two side branches are arranged on one side of the main body, the two side branches arranged on the same side of the main body are arranged at intervals in a first direction, the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer, the two side branches arranged on the same side of the main body and the main body jointly form an installation groove, a part of the installation groove is in the center hole of the zero-sequence transformer, each installation groove is provided with a connecting conductor, and the connecting conductor is arranged close to the groove wall of the installation groove.

10. A leakage circuit breaker, characterized in that: It includes a leakage protection module and a circuit breaker as described in any one of claims 1 to 9; the circuit breaker includes a circuit breaker housing, in which at least two groups of main circuit conductors, an operating mechanism and a leakage release are arranged; each main circuit conductor includes a first main circuit terminal, each first main circuit terminal corresponds to a terminal screw, and the two are electrically connected; the leakage release includes a coil, a push rod and a coil terminal, and the coil, the coil terminal and the first auxiliary terminal are electrically connected; the operating mechanism includes a locking assembly, and the locking assembly is located near the push rod; when leakage occurs in the main line, the first electrical signal is transmitted to the coil, so that the push rod is actuated to trigger the locking assembly to unlock, so that the operating mechanism performs a tripping operation.

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