Residual current detection sensor

Abstract

The utility model relates to a residual current detection sensor, which is used for detecting residual current of a plurality of cables to be detected, and comprises a shell and two oppositely arranged protection lugs, a circuit board and a mutual inductance coil electrically connected with the circuit board are arranged in the shell, and a connecting terminal of the circuit board extends out of the shell; two opposite mounting holes are formed in the shell, an insulating ring is arranged between the two mounting holes, and the mutual inductance coil is arranged on the insulating ring in a sleeving manner; the protection lugs are in one-to-one correspondence with the mounting holes, each protection lug comprises a covering part and an isolation part which are connected with each other, the covering parts are arranged outside the mounting holes, cable holes are formed in the covering parts, to-be-detected cables can sequentially pass through the mounting holes, the insulating ring and the cable holes to be arranged on the sensor in a penetrating manner, and the isolation parts penetrate through the mounting holes, are inserted into the insulating ring and are located among the to-be-detected cables; the isolation parts of the two protection lugs are overlapped with each other; the sensor is simple in structure and convenient to install, and the electrical isolation effect is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage protection, in particular to a residual current detection sensor. Background Art

[0002] The basic principles of residual current detection circuits are based on Kirchhoff's current law: the vector sum of the currents flowing into any node in the circuit is zero; it uses a zero-sequence transformer as a sampling element. When the electrical equipment is normal, the vector sum of the currents of each phase is equal to zero, so the secondary winding of the zero-sequence transformer has no signal output. When a leakage fault occurs, the vector sum of the currents of each phase is not zero, and the fault current causes the annular core of the zero-sequence transformer to generate magnetic flux, and there is an induced current on the secondary side of the current transformer. Currently, residual current detection sensors are basically made based on this principle.

[0003] There are three main types of common residual current detection sensors (RCDs), namely A-type, B-type and AC-type residual current detection sensors. Compared with other types of RCDs, B-type RCDs have a wider coverage in terms of current detection capabilities and can detect more types of fault currents, including sinusoidal AC residual currents and smooth DC residual currents. This comprehensive current detection function enables B-type RCDs to more effectively protect circuits such as energy storage, photovoltaics, inverters, and circuit breakers from various types of electrical faults, thereby reducing the risk of fire and personal safety accidents, and is particularly suitable for charging equipment for new energy vehicles.

[0004] The installation process of the existing B-type residual current detection sensor is cumbersome, cannot be installed quickly, and has incomplete electrical isolation. Utility Model Content

[0005] Based on this, a residual current detection sensor is provided, which effectively simplifies the installation process of the sensor and strengthens the electrical isolation of the cable.

[0006] A residual current detection sensor is used to detect the residual current of a plurality of cables to be tested, the sensor comprising:

[0007] A housing, wherein a circuit board and a mutual inductance coil electrically connected to the circuit board are arranged in the housing, and a connection terminal of the circuit board extends out of the housing;

[0008] The shell is provided with two opposite mounting holes, an insulating ring is provided between the two mounting holes, and the mutual inductance coil is sleeved on the insulating ring;

[0009] Two relatively arranged protective ears, the protective ears correspond to the mounting holes one by one, the protective ears include a covering portion and an isolating portion connected to each other, the covering portion is arranged outside the mounting hole, the covering portion is provided with a cable hole, the cable to be tested can pass through the mounting hole, the insulating ring and the cable hole in sequence and penetrate the sensor, the isolating portion passes through the mounting hole and is inserted into the insulating ring, and is located between the multiple cables to be tested, and the isolating portions of the two protective ears overlap each other.

[0010] In one embodiment, there are two cables to be tested, and a first groove and a second groove are provided in the covering portion for accommodating the two cables to be tested respectively. The first groove is in a "Γ" shape, and the second groove is in a "I" shape. The highest position of the first groove is higher than the highest position of the second groove.

[0011] In one of the embodiments, a buckle is provided on the covering portion, and the buckle extends into the mounting hole and is buckled with the inner wall of the shell.

[0012] In one embodiment, the shell includes a main shell and a bottom cover, the main shell is provided with a buckle portion, the buckle portion is provided with a buckle hole, the bottom cover is provided with a buckle protrusion, and the buckle protrusion passes through the buckle hole to be connected with the buckle portion.

[0013] In one of the embodiments, four of the buckling portions and the buckling protrusions are provided and are evenly distributed along the circumference of the bottom cover, and the buckling portions and the buckling protrusions correspond one to one.

[0014] In one embodiment, the mounting holes are arranged on both sides of the main shell, the bottom cover is provided with a plurality of cable limiting parts, the cable limiting parts are provided with limiting holes, and the cable to be tested can pass through the limiting holes and be fixed on the bottom cover.

[0015] In one of the embodiments, the bottom cover is provided with a plurality of penetrating terminal holes, a chamfer is provided on a side of the hole wall of the terminal hole facing the main shell, and the connecting terminal passes through the terminal hole and extends out of the bottom cover.

[0016] In one embodiment, the circuit board is arranged parallel to the bottom cover, a plurality of PCB support parts are provided in the main shell, a positioning column is provided on the PCB support part, a plurality of positioning holes are provided on the circuit board, the positioning column is inserted into the positioning hole, and the positioning hole corresponds one-to-one with the PCB support part.

[0017] In one embodiment, a plurality of insulating ring limiting portions are provided in the main shell, and the insulating ring limiting portions are provided between the end surface of the mutual inductance coil and the side wall of the main shell, and abut against the circumferential surface of the insulating ring and the end surface of the mutual inductance coil.

[0018] In one of the embodiments, an insulating ring support portion is provided in the main shell, and the insulating ring support portion is provided between the circumference of the insulating ring and the top wall of the main shell, and abuts against the circumference of the insulating ring and the end face of the mutual inductance coil.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. In the residual current detection sensor, the mutual inductance coil is used to detect the residual current of multiple cables to be tested, especially the residual current of the live wire and the neutral wire. The mutual inductance coil is sleeved on the insulating ring. During the installation process, the multiple cables to be tested are first passed through the two mounting holes and the insulating ring in sequence and are penetrated and arranged on the shell, and then the isolation parts of the two protective ears are respectively inserted between the multiple cables to be tested to complete the overlap of the two isolation parts. At this time, the covering part is arranged outside the mounting hole and covers the cable to be tested at the mounting hole. The structure is simple and the installation is convenient; the insulating ring isolates the mutual inductance coil and the cable to be tested to avoid direct contact between the mutual inductance coil and the cable to be tested, and the isolation part of the protective ear isolates the multiple cables to be tested to avoid contact short circuit between the multiple cables to be tested, which effectively improves the electrical isolation effect. At the same time, the covering part of the protective ear can not only effectively prevent impurities from entering the shell and damaging the circuit board and the mutual inductance coil, but also protect the cable to be tested near the mounting hole.

[0021] 2. The protective ear limits the bending path of the cable to be tested in the covering part by setting a first groove and a second groove of different shapes in the covering part, so that the two cables to be tested can be arranged in a high and low staggered manner in the insulating ring, and the volume of the sensor is reduced by limiting the bending path of the cable to be tested.

[0022] 3. The protective ear cooperates with the shell through the buckle on the covering part, realizing the detachable connection of the protective ear. During the installation process, the protective ear can be successfully installed by simply inserting the buckle into the mounting hole. During the disassembly process, the protective ear can be removed from the mounting hole by pressing the part of the protective ear with the buckle. The structure is simple and the installation and disassembly efficiency is high.

[0023] 4. The multiple cable limit parts on the bottom cover can fix the cable to be tested on the bottom cover through the limit holes, which can prevent the cable to be tested from moving randomly, and is conducive to maintaining a fixed distance between different cables to be tested and between the cables to be tested and the wiring terminals, thereby achieving electrical isolation between different cables to be tested and ensuring electrical isolation between the cables to be tested and the wiring terminals.

[0024] 5. The shell limits the up and down position of the circuit board through the PCB support part and the bottom cover, and then limits the front, back, left and right position of the circuit board through the cooperation of the positioning column and the positioning hole, so as to avoid the damage of the sensor caused by the shaking of the circuit board. The structure is simple and the installation is convenient.

[0025] 6. A plurality of insulating ring limit parts are arranged in the shell to simultaneously limit the axial position of the mutual inductance coil and the left and right position of the insulating ring, and an insulating ring support part is arranged so that the insulating ring support part and the bottom cover cooperate to limit the upper and lower positions of the insulating ring, thereby preventing the movement of the insulating ring from affecting the connection between the mutual inductance coil and the circuit board and affecting the relative position of the mutual inductance coil and the cable to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of the detection sensor in the utility model;

[0027] Figure 2 This is the front view of the detection sensor in the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the detection sensor (hidden bottom cover) in the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the detection sensor (hidden protective ears, bottom cover and circuit board) in the utility model;

[0030] Figure 5 This is a schematic diagram of the internal structure of the main shell in the utility model;

[0031] Figure 6 It is a schematic diagram of the structure of the protective ear and the cable to be tested in the utility model;

[0032] Figure 7 It is a schematic diagram of the structure of the protective ear, the insulating ring, the mutual inductance coil and the cable to be tested in the utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the ear protector in the utility model;

[0034] Fig. 9 It is a schematic diagram of the structure of the cable to be tested and the bottom cover in the utility model;

[0035] Fig.10 It is a schematic diagram of the structure of the cable to be tested, the insulating ring and the mutual inductance coil in the utility model.

[0036] Figure numbers: 100, detection sensor; 10, shell; 11, mounting hole; 12, main shell; 121, buckle part; 122, PCB support part; 123, positioning column; 124, insulating ring limit part; 125, insulating ring support part; 13, bottom cover; 131, buckle protrusion; 132, cable limit part; 133, terminal hole; 20, circuit board; 21, connecting terminal; 22, positioning hole; 30, mutual inductance coil; 40, insulating ring; 50, protective ear; 51, covering part; 511, cable hole; 512, first groove; 513, second groove; 52, isolation part; 53, buckle; 60, cable to be tested. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0038] The residual current detection sensor 100 of the present invention is described in detail below with reference to the accompanying drawings.

[0039] like Figures 1 to 10 In one embodiment, a residual current detection sensor 100 is provided for detecting residual currents of a plurality of cables 60 to be tested, the sensor comprising a housing 10 and two oppositely disposed protective ears 50;

[0040] A circuit board 20 and a mutual inductance coil 30 electrically connected to the circuit board 20 are arranged in the housing 10, and a connection terminal 21 of the circuit board 20 extends out of the housing 10; two opposite mounting holes 11 are arranged on the housing 10, an insulating ring 40 is arranged between the two mounting holes 11, and the mutual inductance coil 30 is sleeved on the insulating ring 40;

[0041] Moreover, the protective ear 50 corresponds to the mounting hole 11 one by one, and the protective ear 50 includes a covering portion 51 and an isolating portion 52 which are connected to each other. The covering portion 51 is arranged outside the mounting hole 11, and a cable hole 511 is arranged on the covering portion 51. The cable 60 to be tested can pass through the mounting hole 11, the insulating ring 40 and the cable hole 511 in sequence and penetrate the sensor. The isolating portion 52 passes through the mounting hole 11 and is inserted into the insulating ring 40, and is located between multiple cables to be tested 60. The isolating portions 52 of the two protective ears 50 overlap each other.

[0042] In the residual current detection sensor 100, the mutual inductance coil 30 is used to detect the residual current of multiple cables 60 to be tested, especially to detect the residual current of the live wire and the neutral wire. The mutual inductance coil 30 is sleeved on the insulating ring 40. During the installation process, the multiple cables 60 to be tested are first passed through the two mounting holes 11 and the insulating ring 40 in sequence and are installed on the housing 10, and then the isolation parts 52 of the two protective ears 50 are respectively inserted between the multiple cables 60 to be tested, and the overlap of the two isolation parts 52 is completed. At this time, the covering part 51 is arranged outside the mounting hole 11 and covers the mounting hole 11. The cable to be tested 60 at 11 has a simple structure and is easy to install; the insulating ring 40 isolates the mutual inductance coil 30 and the cable to be tested 60 to avoid direct contact between the mutual inductance coil 30 and the cable to be tested 60; the isolating portion 52 of the protective ear 50 isolates multiple cables to be tested 60 to avoid contact and short circuit between multiple cables to be tested 60, thereby effectively improving the electrical isolation effect; at the same time, the covering portion 51 of the protective ear 50 can not only effectively prevent impurities from entering the interior of the housing 10 and damaging the circuit board 20 and the mutual inductance coil 30, but also protect the cable to be tested 60 near the mounting hole 11.

[0043] Specifically, Figure 2 , Figure 3 , Figure 6 , Figure 8 and Fig.10 As shown, in one embodiment, two cables 60 to be tested are provided, and a first groove 512 and a second groove 513 are provided in the covering portion 51, for accommodating the two cables 60 to be tested respectively, the first groove 512 is in a "Γ" shape, and the second groove 513 is in a "I" shape, and the highest position of the first groove 512 is higher than the highest position of the second groove 513. The protective ear 50 limits the bending path of the cable 60 to be tested in the covering portion 51 by providing the first groove 512 and the second groove 513 of different shapes in the covering portion 51, so that the two cables 60 to be tested can be arranged in a high and low staggered manner in the insulating ring 40, and the volume of the sensor is reduced by limiting the bending path of the cable 60 to be tested.

[0044] Furthermore, if Figure 6 , Figure 7 and Figure 8 As shown, in one embodiment, a buckle 53 is provided on the cover portion 51, and the buckle 53 extends into the mounting hole 11 and buckles with the inner wall of the housing 10. The protective ear 50 cooperates with the housing 10 through the buckle 53 on the cover portion 51, so that the protective ear 50 is detachably connected. During the installation process, the protective ear 50 can be successfully installed by inserting the buckle 53 into the mounting hole 11. During the disassembly process, the protective ear 50 can be removed from the mounting hole 11 by pressing the portion of the protective ear 50 where the buckle 53 is provided. The structure is simple and the installation and disassembly efficiency is high.

[0045] Each protective ear 50 is provided with two buckles 53 , and the two buckles 53 are symmetrically arranged relative to the central axis of the insulating ring 40 .

[0046] Specifically, Figure 2 , Figure 4 , Figure 5 and Fig. 9 As shown, in one embodiment, the housing 10 includes a main housing 12 and a bottom cover 13, the main housing 12 is provided with a buckle portion 121, the buckle portion 121 is provided with a buckle hole, the bottom cover 13 is provided with a buckle protrusion 131, and the buckle protrusion 131 passes through the buckle hole and is connected to the buckle portion 121. The main housing 12 and the bottom cover 13 are detachably connected through the buckle portion 121 and the buckle protrusion 131, the structure is simple, and the installation scheme is convenient.

[0047] There are four buckling parts 121 and buckling protrusions 131 , which correspond to each other one by one and are evenly distributed in the circumference of the shell 10 , so as to realize multi-directional buckling.

[0048] Specifically, Figure 2 and Fig. 9 As shown, in one embodiment, the mounting holes 11 are provided on both sides of the main housing 12, and a plurality of cable stoppers 132 are provided on the bottom cover 13. The cable stoppers 132 are provided with stopper holes, and the cable to be tested 60 can pass through the stopper holes and be fixed on the bottom cover 13. The plurality of cable stoppers 132 on the bottom cover 13 can fix the cable to be tested 60 on the bottom cover 13 through the stopper holes, which can prevent the cable to be tested 60 from moving at will, and is conducive to maintaining a fixed distance between different cables to be tested 60 and between the cables to be tested 60 and the wiring terminals, thereby achieving electrical isolation between different cables to be tested 60 and also ensuring electrical isolation between the cables to be tested 60 and the wiring terminals.

[0049] In addition, the cable limiting portion 132 corresponds to the cable hole 511 on the protective ear 50. When the sensor is used to test the residual current of the live wire and the neutral wire, each protective ear 50 is provided with two cable holes 511, and the bottom cover 13 is provided with four cable limiting portions 132 corresponding to the cable holes 511. After the cable 60 to be tested comes out of the mounting hole 11, it is first bent horizontally, extends in the horizontal direction along the side wall of the shell 10, and then vertically bent after passing through the cable hole 511, extends in the vertical direction along the side wall of the shell 10, and finally passes through the limiting hole.

[0050] Furthermore, if Fig. 9 As shown, in one embodiment, a plurality of through terminal holes 133 are provided on the bottom cover 13, and a chamfer is provided on the side of the terminal hole 133 facing the main housing 12, and the connecting terminal 21 passes through the terminal hole 133 and extends out of the bottom cover 13. The chamfer of the terminal hole 133 facilitates the connecting terminal 21 to pass through the terminal hole 133, and can prevent dust from entering the housing 10 through the terminal hole 133.

[0051] There are a plurality of terminal holes 133, the number of which is set according to the number of connection terminals 21, corresponding one to one with the connection terminals 21, and the arrangement of the terminal holes 133 is set according to the arrangement of the connection terminals 21. In this specific embodiment, the terminal holes 133 are arranged in two rows, with 5 terminal holes 133 in each row.

[0052] Furthermore, if Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the circuit board 20 is arranged in parallel with the bottom cover 13, a plurality of PCB support parts 122 are arranged in the main shell 12, a positioning column 123 is arranged on the PCB support part 122, a plurality of positioning holes 22 are arranged on the circuit board 20, the positioning column 123 is inserted into the positioning hole 22, and the positioning hole 22 corresponds to the PCB support part 122 one by one. The housing 10 limits the up and down position of the circuit board 20 through the PCB support part 122 and the bottom cover 13, and then limits the front, back, left and right position of the circuit board 20 through the cooperation of the positioning column 123 and the positioning hole 22, so as to avoid the circuit board 20 shaking and causing damage to the sensor, and the structure is simple and easy to install.

[0053] There are four PCB support parts 122 , which are arranged at four corners of the circuit board 20 .

[0054] Furthermore, if Figure 4 , Figure 5 and Fig. 9 As shown, in one embodiment, a plurality of insulating ring limit portions 124 are provided in the main shell 12 , and the insulating ring limit portions 124 are provided between the end surface of the mutual inductance coil 30 and the side wall of the main shell 12 , and abut against the circumferential surface of the insulating ring 40 and the end surface of the mutual inductance coil 30 .

[0055] In this specific embodiment, Figure 5 As shown, an insulating ring support portion 125 is provided in the main shell 12, and the insulating ring support portion 125 is provided between the circumference of the insulating ring 40 and the top wall of the main shell 12, and abuts against the circumference of the insulating ring 40 and the end face of the mutual inductance coil 30. A plurality of insulating ring limit portions 124 are provided in the shell 10, so as to limit the axial position of the mutual inductance coil 30 and the left and right position of the insulating ring 40 at the same time, and the insulating ring support portion 125 is provided, so that the insulating ring support portion 125 and the bottom cover 13 cooperate to limit the upper and lower positions of the insulating ring 40, so as to prevent the movement of the insulating ring 40 from affecting the connection between the mutual inductance coil 30 and the circuit board 20, and affecting the relative position of the mutual inductance coil 30 and the cable 60 to be tested.

[0056] There are two insulating ring supporting parts 125 and four insulating ring limiting parts 124 .

[0057] In the description of the present invention, 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 invention 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 invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A residual current detection sensor for detecting residual currents of multiple cables to be tested, characterized in that: The sensor comprises: A housing, wherein a circuit board and a mutual inductance coil electrically connected to the circuit board are arranged in the housing, and a connection terminal of the circuit board extends out of the housing; The shell is provided with two opposite mounting holes, an insulating ring is provided between the two mounting holes, and the mutual inductance coil is sleeved on the insulating ring; Two relatively arranged protective ears, the protective ears correspond to the mounting holes one by one, the protective ears include a covering portion and an isolating portion connected to each other, the covering portion is arranged outside the mounting hole, the covering portion is provided with a cable hole, the cable to be tested can pass through the mounting hole, the insulating ring and the cable hole in sequence and penetrate the sensor, the isolating portion passes through the mounting hole and is inserted into the insulating ring, and is located between the multiple cables to be tested, and the isolating portions of the two protective ears overlap each other.

2. The residual current detection sensor according to claim 1, characterized in that: There are two cables to be tested, and a first groove and a second groove are provided in the covering portion for accommodating the two cables to be tested respectively. The first groove is in a "Γ" shape, and the second groove is in a "I" shape. The highest position of the first groove is higher than the highest position of the second groove.

3. The residual current detection sensor according to claim 1, characterized in that: The covering portion is provided with a buckle, and the buckle extends into the mounting hole and is buckled with the inner wall of the shell.

4. The residual current detection sensor according to claim 1, characterized in that: The shell comprises a main shell and a bottom cover, the main shell is provided with a buckle part, the buckle part is provided with a buckle hole, the bottom cover is provided with a buckle protrusion, and the buckle protrusion passes through the buckle hole and is connected with the buckle part.

5. The residual current detection sensor according to claim 4, characterized in that: The buckling parts and the buckling protrusions are respectively provided with four and are evenly distributed along the circumference of the bottom cover, and the buckling parts and the buckling protrusions correspond to each other one by one.

6. The residual current detection sensor according to claim 4, characterized in that: The mounting holes are arranged on both sides of the main shell, a plurality of cable limiting parts are arranged on the bottom cover, and limiting holes are arranged on the cable limiting parts. The cable to be tested can pass through the limiting holes and be fixed on the bottom cover.

7. The residual current detection sensor according to claim 4, characterized in that: The bottom cover is provided with a plurality of penetrating terminal holes, and a chamfer is provided on a side of the hole wall of the terminal hole facing the main shell, and the connecting terminal passes through the terminal hole and extends out of the bottom cover.

8. The residual current detection sensor according to claim 4, characterized in that: The circuit board is arranged parallel to the bottom cover, a plurality of PCB support parts are arranged in the main shell, a positioning column is arranged on the PCB support part, a plurality of positioning holes are arranged on the circuit board, the positioning column is inserted into the positioning hole, and the positioning hole corresponds to the PCB support part one by one.

9. The residual current detection sensor according to claim 4, characterized in that: A plurality of insulating ring limiting parts are arranged in the main shell, and the insulating ring limiting parts are arranged between the end surface of the mutual inductance coil and the side wall of the main shell, and abut against the circumferential surface of the insulating ring and the end surface of the mutual inductance coil.

10. The residual current detection sensor according to claim 9, characterized in that: An insulating ring support portion is provided in the main shell. The insulating ring support portion is provided between the circumference of the insulating ring and the top wall of the main shell, and abuts against the circumference of the insulating ring and the end surface of the mutual inductance coil.

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