Leakage protector

Abstract

The utility model discloses a leakage protector. The leakage protector comprises a support, a first contact piece, a first elastic piece, a second contact piece, a second elastic piece, a limiting piece, an electromagnetic driver, a pull rod, a reset spring, a current transformer and a circuit board, a first fixing groove, a second fixing groove, a first clamping groove, a second clamping groove, a limiting groove and a guide groove are formed in the support in the first direction. The first contact piece is embedded in the first fixing groove, and the first contact piece is provided with a first contact part; the first elastic piece is provided with a first swing end, a first clamping and embedding part and a first U-shaped part, the first clamping and embedding part is clamped and embedded in the first clamping groove, and the first swing end is connected with the first contact part; the second contact piece is embedded in the second fixing groove, and the second contact piece is provided with a second contact part; the second elastic piece is provided with a second swing end, a second clamping and embedding part and a second U-shaped part, the second clamping and embedding part is clamped and embedded in the second clamping groove, and the second swing end is connected with the second contact part. The leakage protector is simple in structure, convenient to assemble and high in automation degree.

Description

Technical Field

[0001] This application belongs to the technical field of leakage current protection devices, and particularly relates to a leakage current protection device. Background Technology

[0002] A residual current device (RCD) is an electrical safety device used to detect abnormal leakage current in a circuit and cut off the power supply. It is mainly used for equipment leakage protection and personal electric shock protection. Typically, an RCD consists of a detection unit, an intermediate amplification unit, and a circuit-breaking execution unit. The detection unit mainly includes a current transformer, used to monitor the current balance between the live and neutral wires in real time, specifically monitoring the current difference between the live and neutral wires, i.e., the leakage current. The intermediate amplification unit receives the leakage current signal, amplifies it, and transmits it to the circuit-breaking execution unit. The circuit-breaking execution unit mainly includes an electromagnetic disconnector, used to cut off the power circuit. Current-type RCDs achieve leakage current detection based on Kirchhoff's current law. The RCD has a leakage current threshold, such as 30mA. When the detected leakage current exceeds the threshold, the detection signal amplified by the intermediate amplification unit drives the circuit-breaking execution unit to disconnect the contacts, pins, and other structures in a contacted state in the power circuit, thereby achieving the circuit breaking operation. Generally, under normal conditions, the live wire current and the neutral wire current are equal, the magnetic field of the current transformer cancels each other out, and there is no signal output; under abnormal leakage conditions, the live wire current is greater than the neutral wire current, and the leakage current is greater than or equal to the preset leakage threshold, and the current transformer output signal triggers the electromagnetic trip device to perform a power-off action.

[0003] The aforementioned current-type residual current device (RCD) has a large number of structural and functional components, including various actuating structures such as the housing, bracket, and actuating elements, as well as various electrical components such as conductive contacts, terminals, and electronic components. This results in a complex structure and composition of the entire current-type RCD, which requires high precision in assembly operations, making it prone to defects and even substandard products. Furthermore, the assembly is difficult, often requiring a large amount of manual intervention, resulting in low automation and unsatisfactory overall assembly efficiency. Summary of the Invention

[0004] This application provides a residual current device (RCD) designed to at least partially address the technical problems of current-type RCDs, such as complex internal structure, difficult assembly, high degree of manual intervention, low automation, and unsatisfactory overall assembly efficiency. Therefore,

[0005] This application provides a leakage current protector, including: a support, a first contact, a first spring, a second contact, a second spring, a limiting member, an electromagnetic actuator, a pull rod, a reset spring, a current transformer, and a circuit board;

[0006] The support is provided with a first fixing groove, a second fixing groove, a first locking groove, a second locking groove, a limiting groove, and a guide groove along the first direction;

[0007] The first contact piece is embedded in the first fixing groove, and the first contact piece has a first contact portion;

[0008] The first spring sheet has a first swing end, a first locking part and a first U-shaped part arranged in sequence. The first locking part is locked in the first locking groove, and the first swing end is detachably connected to the first contact part.

[0009] The second contact piece is embedded in the second fixing groove on the support, and the second contact piece has a second contact portion;

[0010] The second spring has a second swing end, a second locking part and a second U-shaped part arranged in sequence. The second locking part is locked in the second locking groove, and the second swing end is detachably connected to the second contact part.

[0011] The limiting member is rotatably disposed in the limiting groove. The limiting member is provided with a first limiting arm, a second limiting arm and a first hook portion. In the first direction, the first limiting arm and the first contact portion are located on both sides of the first swing end, and the second limiting arm and the second contact portion are located on both sides of the second swing end. The limiting member can move along the first direction.

[0012] The pull rod is embedded in the guide groove, the return spring is compressed between the pull rod and the guide groove along the first direction, and the pull rod is provided with a second hook part, which can be detachably engaged with the first hook part;

[0013] The first U-shaped portion and the second U-shaped portion pass through the current transformer, and the tail ends of the first U-shaped portion and the second U-shaped portion, the current transformer, and the electromagnetic driver are respectively connected to the circuit board.

[0014] In some embodiments, a limiting post is provided on the support along the first direction, a locking hook is provided on the limiting post, a limiting hole is provided on the circuit board, the circuit board is fastened to the support along the first direction, and the limiting post passes through the limiting hole, and the locking hook is hooked on the circuit board.

[0015] In some embodiments, the residual current device further includes: a first terminal block and a second terminal block;

[0016] The first terminal block is electrically connected to the tail end of the first U-shaped portion, and the second terminal block is electrically connected to the tail end of the second U-shaped portion.

[0017] In some embodiments, the first connector and the first U-shaped portion are respectively located on both sides of the circuit board, and a first locking groove is provided on the circuit board, in which the first connector is snapped into the first locking groove;

[0018] The second connector and the second U-shaped part are located on opposite sides of the circuit board, and a second locking groove is provided on the circuit board, in which the second connector is snapped into the second locking groove.

[0019] In some embodiments, the first and second terminals are respectively connected to terminals on their contact sides.

[0020] In some embodiments, a positioning post is provided on the support, and the current transformer is sleeved on the positioning post.

[0021] In some embodiments, the first fixing groove and the second fixing groove are configured as through holes penetrating the support, the first contact piece is inserted through the first fixing groove, the first contact portion abuts against the opening of the first fixing groove, the second contact piece is inserted through the second fixing groove, and the second contact portion abuts against the opening of the second fixing groove.

[0022] In some embodiments, the electromagnetic actuator includes an electromagnet coil and an electromagnet floating pin;

[0023] The electromagnet coil is mounted on the support and is electrically connected to the circuit board.

[0024] The electromagnet floating pin is movably disposed within the electromagnet coil, and the electromagnet floating pin is connected to the limiting member.

[0025] In some embodiments, the limiting member has a groove along the first direction, the end of the electromagnet floating pin is embedded in the groove, and the end of the electromagnet floating pin slides relative to the groove.

[0026] In some embodiments, the first swing end, the first contact portion, the second swing end, and the second contact portion are suspended outside the support.

[0027] The embodiments of this application have at least the following beneficial effects:

[0028] The leakage current protector provided in this application embodiment is based on a support and has a unified fixing structure with slots, fixing slots, guide slots, etc., opened along a first direction for matching and installing the first contact, the first spring, the second contact, the second spring, the limiting member, the electromagnetic actuator, the pull rod, the return spring, the current transformer, and the circuit board. This greatly simplifies the assembly operation of each component, especially enabling efficient assembly using automated production lines, thus improving assembly efficiency. On the other hand, the first contact and the first spring, as well as the second contact and the second spring, form a dual-circuit breaking structure. The limiting member, the electromagnetic actuator, and the return spring of the pull rod work together to drive the conduction and de-energization operations. The leakage current is detected by the current transformer and the circuit board to achieve real-time control, thus greatly simplifying the power-off protection function structure. At the same time, the number of functional components is small, and they can be assembled in the same direction, which simplifies the overall structure and facilitates the introduction of automated assembly lines, thereby reducing manual intervention and improving assembly efficiency. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the main structure of the leakage current protector in an embodiment of this application is shown;

[0031] Figure 2 It shows Figure 1 A schematic diagram of the internal structure of a residual current device (RCD) in a circuit;

[0032] Figure 3 It shows Figure 1 A schematic diagram of the internal functional structure of a residual current device (RCD) in a circuit breaker.

[0033] Figure 4 It shows Figure 1 Top view of the internal structure of the residual current device (RCD) in the circuit;

[0034] Figure 5 It shows Figure 1 A bottom view of the residual current device (RCD) in the middle;

[0035] Figure 6 It shows Figure 3 A bottom view of the internal functional structure of a residual current device (RCD) in a circuit breaker;

[0036] Figure 7 It shows Figure 1 A schematic diagram of the structure of the first spring of the residual current device (RCD) in the circuit breaker;

[0037] Figure 8 It shows Figure 1 A schematic diagram of the limiting component of the residual current device (RCD) in the circuit;

[0038] Figure 9 It shows Figure 1 A schematic diagram of the pull rod structure of the residual current device (RCD) in the circuit;

[0039] Figure 10 It shows Figure 1 A schematic diagram of the structure of the support for the residual current device (RCD) in the circuit;

[0040] Figure 11 It shows Figure 10 Left view of the support in the middle;

[0041] Figure 12 It shows Figure 1 Cross-sectional view of the internal structure of the residual current device (RCD) in the circuit;

[0042] Figure 13 It shows Figure 1 A schematic diagram showing the interaction of the electromagnetic actuator, limiter, and pull rod in the residual current device (RCD).

[0043] Figure 14 It shows Figure 1 A schematic diagram of the assembly status of the bottom shell of the residual current device (RCD).

[0044] Figure 15 It shows Figure 14 A schematic diagram of the partial assembly state of the bottom shell of the residual current device (RCD).

[0045] Figure 16 It shows Figure 1 A schematic diagram of the assembly state of the casing of the residual current device (RCD).

[0046] Figure 17 It shows Figure 1 Another structural diagram of the residual current device (RCD) in the circuit;

[0047] Figure 18 It shows Figure 17 A schematic diagram of the internal structure of a residual current device (RCD) in a circuit;

[0048] Figure 19 It shows Figure 17 A schematic diagram of the casing of a residual current device (RCD) in China.

[0049] Figure label:

[0050] 1-Support, 11-First fixing groove, 12-Second fixing groove, 13-First locking groove, 14-Second locking groove, 15-Limiting groove, 16-Guide groove, 161-Limiting boss, 17-Limiting post, 171-Locking hook, 18-Positioning post, 19-Outer shell, 191-Bottom shell, 192-Top cover, 193-Deflection cover, 194-Terminal bracket;

[0051] 21-First contact piece, 211-First contact part, 22-Second spring piece, 221-Second contact part;

[0052] 31-First spring piece, 311-First swing end, 312-First locking part, 313-First U-shaped part, 32-Second spring piece, 321-Second swing end, 322-Second locking part, 323-Second U-shaped part;

[0053] 4-Limiting component, 41-First limiter, 42-Second limiter arm, 43-First hook, 44-Slide groove;

[0054] 5-Electromagnetic actuator, 51-Electromagnetic coil, 52-Electromagnetic floating pin, 53-Retaining spring;

[0055] 6-Pull rod, 61-Second hook, 62-Press cap, 63-Reset spring;

[0056] 7-Current transformer;

[0057] 8-Circuit board, 81-Limiting hole, 82-Allowing hole, 83-First locking slot, 84-Second locking slot, 85-Test button switch;

[0058] 91-First connector, 911-First terminal block, 92-Second connector, 921-Second terminal block, 93-Third connector, 931-Third terminal block. Detailed Implementation

[0059] This application is described below with reference to the accompanying drawings and specific embodiments:

[0060] A residual current device (RCD) is a typical residual current protection device used for the electrical safety protection of various electrical appliances. Existing RCDs have a complex structure, are difficult to assemble, require a certain degree of manual intervention, have a low degree of automation, and have low overall assembly efficiency.

[0061] Therefore, this application provides a residual current device (RCD) that aims to simplify the structure and assembly operation of the RCD to a certain extent, facilitate the application of automated equipment, and improve assembly efficiency.

[0062] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 In some embodiments, the leakage current protector includes: a support 1 and a first contact 21, a first spring 31, a second contact 22, a second spring 32, a limiting member 4, an electromagnetic actuator 5, a pull rod 6, a reset spring 63, a current transformer 7, and a circuit board 8 disposed on the support 1.

[0063] The support 1 has multiple insert structures arranged along the first direction Z for the aforementioned components to be inserted and installed onto the support 1 along the first direction Z, thereby simplifying the assembly operation to a certain extent and facilitating installation by automated equipment, thus improving assembly efficiency. Specifically, the support 1 has a first fixing groove 11, a second fixing groove 12, a first insert groove 13, a second insert groove 14, a limiting groove 15, and a guide groove 16 formed along the first direction Z. Generally, the support 1 and its insert structures can be integrally formed by injection molding, thereby improving the dimensional and morphological accuracy of the functional structure.

[0064] The first contact piece 21 and the first spring piece 31 are mating, separable conductive components. A conductive path is established through their connection, and the conductive path is severed through their separation. The first contact piece 21 is embedded in the first fixing groove 11 and has a first contact portion 211 for making an electrical connection with the first spring piece 31. Specifically, the first contact piece 21 can be directly inserted into the first fixing groove 11 along the first direction Z, and the first contact portion 211 is positioned in a preset position to cooperate with the first spring piece 31. The first contact piece 21 is also electrically connected to external electrical equipment or a power source.

[0065] The first spring piece 31 is an elastically deformable conductive element, typically a copper sheet. The first spring piece 31 is engaged in the first engagement groove 13, and a portion of its main body can deform and shift under external force, thereby contacting or separating from the first contact piece 21. Specifically, the first spring piece 31 comprises a first swing end 311, a first engagement portion 312, and a first U-shaped portion 313 arranged sequentially. The first engagement portion 312 is the fixing portion of the first spring piece 31, which can be engaged in the first engagement groove 13; during assembly, the first engagement portion 312 can be directly inserted into the first engagement groove 13 along the first direction Z. The first swing end 311 is a movable part of the first spring piece 31, capable of moving towards the first contact portion 211 under external force and ultimately abutting against the first contact portion 211; simultaneously, when the external force is eliminated or reduced, the first swing end 311 can move in the reset direction under the action of the metal deformation restoring force, thereby disconnecting from the first contact portion 211. The tail end of the first U-shaped portion 313 can be electrically connected to external electrical equipment or power supply. Generally, the first swing end 311 has at least two stable positions: the position where the first swing end 311 is connected to the first contact portion 211, and the position where the first swing end 311 is away from the first contact portion 211.

[0066] The second contact piece 22 and the second spring piece 32 are mating, separable conductive components. Their connection establishes a conductive path, and their separation breaks the conductive path. Accordingly, the second contact piece 22 is embedded in the second fixing groove 12, and the second contact piece 22 is provided with a second contact portion 221 for contacting and connecting with the second spring piece 32. Specifically, the second contact piece 22 can be directly inserted into the second fixing groove 12 along the first direction Z, and the second contact portion 221 is positioned in a preset position to cooperate with the second spring piece 32. The second contact piece 22 is also electrically connected to external electrical equipment or a power source.

[0067] The second spring piece 32 is an elastically deformable conductive element, typically a copper sheet. The second spring piece 32 is engaged in the second engagement groove 14, and a portion of its main body can deform and shift under external force, thereby contacting or separating from the second contact piece 22. Specifically, the second spring piece 32 has a second swing end 321, a second engagement portion 322, and a second U-shaped portion 323 arranged sequentially. The second engagement portion 322 is the fixing portion of the second spring piece 32, which can be engaged in the second engagement groove 14; during assembly, the second engagement portion 322 can be directly inserted into the second engagement groove 14 along the first direction Z. The second swing end 321 is the movable part of the second spring piece 32, which can move towards the second contact portion 221 under external force and ultimately abut against the second contact portion 221; simultaneously, when the external force is eliminated or reduced, the second swing end 321 can move in the reset direction under the action of the metal deformation restoring force, thereby disconnecting from the second contact portion 221. The tail end of the first U-shaped portion 313 can be electrically connected to external electrical equipment or power supply. Generally, the second swing end 321 has at least two stable positions: the position where the second swing end 321 is connected to the second contact portion 221, and the position where the second swing end 321 is away from the second contact portion 221.

[0068] The limiting member 4, the electromagnetic actuator 5, the pull rod 6, and the return spring 63 constitute an on / off actuator, which cooperates with the first swing end 311 and the second swing end 321 to adjust their positions. Specifically, the limiting member 4 is connected to the first swing end 311 and the second swing end 321, the pull rod 6 is detachably connected to the limiting member 4, and the electromagnetic actuator 5 is connected to the limiting member 4.

[0069] The limiting groove 15 is a groove with a certain depth. The limiting member 4 is movably disposed in the limiting groove 15 along the first direction Z. The limiting member 4 is provided with a first limiting arm 41 and a second limiting arm 42. In the first direction Z, the first limiting arm 41 and the first contact portion 211 are located on both sides of the first swing end 311, and the second limiting arm 42 and the second contact portion 221 are located on both sides of the second swing end 321. Thus, the first limiting arm 41 and the second limiting arm 42 can actively push against the movement of the first swing end 311 and the second swing end 321, or be passively reset under the action of the reset elastic force of the first swing end 311 and the second swing end 321.

[0070] The pull rod 6 is movably embedded in the guide groove 16 along the first direction Z, and the return spring 63 is compressed between the pull rod 6 and the bottom of the guide groove 16 along the first direction Z. Thus, the return spring 63 always provides a stable driving force to the pull rod 6, indirectly driving the limiting member 4 to push the first swing end 311 and the second swing end 321 towards the first contact portion 211 and the second contact portion 221, and ultimately maintaining electrical contact. Correspondingly, to achieve a separable connection between the limiting member 4 and the pull rod 6, the limiting member 4 is also provided with a first hook portion 43, and the pull rod is provided with a second hook portion 61. When the first hook portion 43 and the second hook portion 61 are engaged, the limiting member 4 and the pull rod 6 will move synchronously under the elastic force of the return spring 63. Generally, a limiting boss 161 can be provided at the bottom of the guide groove 16, and the return spring 63 is sleeved on the limiting boss 161 to maintain the deformation direction of the return spring 63.

[0071] Simultaneously, the first hook part 43 and the second hook part 61 can be separated from the limiting member 4, which moves with the pull rod 6. In order to separate the first hook part 43 and the second hook part 61, the limiting member 4 is rotatably disposed in the limiting groove 15, and the shape of the limiting groove 15 matches the shape of the limiting member 4, so that the limiting member 4 can rotate to a certain extent in the current position. The rotation of the limiting member 4 is approximately in-situ rotation, so that the limiting member 4 can rotate a certain angle under the drive of the electromagnetic actuator 5, disconnecting the connection between the first hook part 43 and the second hook part 61, and the limiting member 4 is disengaged from the pull rod 6.

[0072] Wherein, after the limiting member 4 is disconnected from the pull rod 6, the limiting member 4 moves away from the pull rod 6 under the restoring force of the first spring 31 and the second spring 32, and moves towards the bottom of the limiting groove 4.

[0073] The current transformer 7 is a leakage current sensing element, connected to the circuit board 8, and together they realize leakage current detection based on Kirchhoff's current law. When leakage current is detected, the circuit board 8 drives the electromagnetic driver 5 to act, causing the first hook part 43 to separate from the second hook part 61, disconnecting the electrical connection 1 between the first spring 31 and the first contact 2, and disconnecting the electrical connection between the second spring 32 and the second contact 22.

[0074] Under normal conditions, the current transformer 7 is not triggered, and the electromagnetic driver 5 remains in its current state so that by pressing the pull rod 6 downward, the first hook part 43 and the second hook part 61 are engaged and maintained in the engaged state. Then, under the elastic force of the return spring 63, the limiting member 4, the first swing end 311 and the second swing end 321 are pulled towards the first contact part 211 and the second contact part 221 until an electrical connection is established.

[0075] The circuit board 8 is a circuit unit with amplification function, capable of amplifying the leakage current output by the electromagnetic transformer 7, thereby driving the electromagnetic driver 5 to operate. Furthermore, the circuit board 8 can also be electrically connected to the first spring 31 and the second spring 32; generally, the tail ends of the first U-shaped portion 313 and the second U-shaped portion 323 can be connected to the electrical signal terminals of the circuit board 8.

[0076] In some embodiments, considering that the circuit board 8 has a certain area, the circuit board 8 can be covered by the support, and one or more of the first contact 21, the first spring 31, the second contact 22, the second spring 32, the limiting member 4, the electromagnetic driver 5, the pull rod 6, the reset spring 63, and the current transformer 7 can be encapsulated, either wholly or partially, between the circuit board 8 and the support 1, thereby achieving constraint protection and avoiding external interference.

[0077] Correspondingly, a limiting post 17 is provided on the support 1 along the first direction Z, and a locking hook 171 is provided at the tail end of the limiting post 17. A limiting hole 81 is provided on the circuit board 8, and the limiting post 17 passes through the limiting hole 81 and is tightened by the locking hook 171.

[0078] Of course, the circuit board 8 is also provided with a clearance hole 82 for the pull rod 6 to pass through.

[0079] In some embodiments, to facilitate the connection of external wires, a first connector 91 can be connected to the tail end of the first U-shaped portion 313, and a second connector 92 can be connected to the tail end of the second U-shaped portion 323 for external power connection.

[0080] Generally, the first terminal block 91 and the second terminal block 92 can be disposed on the outside of the circuit board 8, that is, the first U-shaped portion 313 and the first terminal block 91 are located on both sides of the circuit board, and the second U-shaped portion 323 and the second terminal block 92 are located on both sides of the circuit board.

[0081] In some embodiments, for ease of connection, the tail end of the first U-shaped portion 313 and the tail end of the second U-shaped portion 323 can pass through the circuit board 8, and the first connector 91 and the second connector 92 are respectively sleeved on the tail end of the first U-shaped portion 313 and the tail end of the second U-shaped portion 323, thereby achieving convenient installation.

[0082] In some embodiments, in order to enhance the fixing effect, the edge of the circuit board 8 is provided with a locking structure along the first direction Z, namely a first locking groove 83 and a second locking groove 84. The first terminal piece 91 can be inserted into the first locking groove 83 along the first direction Z, and the second terminal piece 92 can be inserted into the second locking groove 84 along the first direction Z, so as to limit the swing of the first terminal piece 91 and the second terminal piece 92 and ensure the stability of the electrical connection state.

[0083] In some embodiments, in order to facilitate the connection of conductive components such as wires, the wiring side of the first terminal block 91 may be connected to the first terminal block 911, and the wiring side of the second terminal block 92 may be connected to the second terminal block 921.

[0084] In some embodiments, a positioning post 18 is provided on the support 1, and the current transformer 7 is sleeved on the positioning post 18. Thus, during installation, it is only necessary to sleeve it along the positioning post 18, which is simple, convenient, and more suitable for automated equipment operation.

[0085] Generally, the positioning post 18 can be set along the first direction Z.

[0086] In some embodiments, for ease of use with the socket, the first fixing groove 11 and the second fixing groove 12 are configured as through holes penetrating the support 1, the first contact piece 21 is inserted through the first fixing groove 11, the first contact portion 21 abuts against the opening of the first fixing groove 11, the second contact piece 22 is inserted through the second fixing groove 12, and the second contact portion 22 abuts against the opening of the second fixing groove 12.

[0087] That is, one end of the first contact piece 21 and the second contact piece 22 can be processed into a plug for insertion into a socket.

[0088] In some embodiments, the electromagnetic actuator 5 is implemented by utilizing the principle that a magnet moves under the force of a magnetic field. Specifically, the electromagnetic actuator 5 includes an electromagnet coil 51 and an electromagnet floating pin 52.

[0089] The electromagnet coil 51 is disposed on the support 1 and is electrically connected to the circuit board 8; the electromagnet floating pin 52 is movably disposed inside the electromagnet coil 51 and is connected to the limiting member 4.

[0090] The circuit board 8 outputs different current signals to adjust the magnitude and direction of the current in the electromagnet coil 51, thereby adjusting the magnitude and direction of the electromagnetic field generated by the electromagnet coil 51, so as to drive the electromagnet floating pin 52 to move, thereby realizing the rotation of the limiting member 4.

[0091] In some embodiments, a retaining spring 53 is provided between one side of the electromagnet floating pin 52 and the bottom of the electromagnet coil 51 to keep the position of the electromagnet floating pin stable.

[0092] In some embodiments, considering that the limiting member 4 also needs to move in the first direction Z, the limiting member 4 is provided with a sliding groove 44 along the first direction Z, the end of the electromagnet floating pin 52 is embedded in the sliding groove 44, and the end of the electromagnet floating pin 52 slides relative to the sliding groove 44, thereby accommodating the movement of the limiting member 4 in the first direction Z.

[0093] In some embodiments, in order to reduce the size of the support 1 and facilitate installation, the first swing end 311, the first contact portion 211, the second swing end 321 and the second contact portion 221 are suspended outside the support 1, thereby also reducing the risk of interference to the first swing end 311 and the second swing end 321.

[0094] See Figure 12 and Figure 13 In some embodiments, the residual current device may further include a third terminal block 93 as a grounding connection terminal; and may be configured with a third terminal block 931.

[0095] See Figure 14 , Figure 15 and Figure 16 In some embodiments, the leakage current protector may further include a housing 19. After the support 1 and its functional components are installed, they can be installed as a whole into the housing 19 to achieve encapsulation and protection.

[0096] In some embodiments, to accommodate the housing 19, a press cap 62 may be provided at the end of the pull rod 6. The press cap may be integrally formed on the pull rod 6, or it may be configured as a detachable independent press cap.

[0097] Similarly, for ease of installation, the outer casing 19 can be configured as two interlocking casings, namely a bottom casing 191 and a top cover 192.

[0098] In some embodiments, in order to facilitate wire insertion and installation, a terminal bracket 194 is provided on the bottom shell 191 for fixing the wiring terminal; and one side of the main body of the bottom shell 191 can be configured as a deflectable shell, i.e., a deflection cover 193, and the deflection cover 193 can be deflected to open and close, thereby facilitating the exposure or closure of the entire shell.

[0099] In some embodiments, a test push button switch 85 may also be connected to the circuit board 8 to generate a switch signal and manually control the operation of the electromagnetic driver 5, thereby enabling manual disconnection of the power supply or testing the functional reliability of the leakage current protector.

[0100] See Figure 17 , Figure 18 and Figure 19 In some embodiments, the leakage current protector can also be configured as a simple wiring element, that is, the first contact 21, the second contact 22, the first wiring piece 91 and the second wiring piece 92 are configured as wiring components for corresponding connection to the power circuit.

[0101] The embodiments of this application have at least the following beneficial effects:

[0102] The leakage current protector provided in this application embodiment is based on a support and has a unified fixing structure with slots, fixing slots, guide slots, etc., opened along a first direction for matching and installing the first contact, the first spring, the second contact, the second spring, the limiting member, the electromagnetic actuator, the pull rod, the return spring, the current transformer, and the circuit board. This greatly simplifies the assembly operation of each component, especially enabling efficient assembly using automated production lines, thus improving assembly efficiency. On the other hand, the first contact and the first spring, as well as the second contact and the second spring, form a dual-circuit breaking structure. The limiting member, the electromagnetic actuator, and the return spring of the pull rod work together to drive the conduction and de-energization operations. The leakage current is detected by the current transformer and the circuit board to achieve real-time control, thus greatly simplifying the power-off protection function structure. At the same time, the number of functional components is small, and they can be assembled in the same direction, which simplifies the overall structure and facilitates the introduction of automated assembly lines, thereby reducing manual intervention and improving assembly efficiency.

Claims

1. A residual current device (RCD), characterized in that, include: Support, first contact piece, first spring piece, second contact piece, second spring piece, limiting component, electromagnetic actuator, pull rod, return spring, current transformer and circuit board; The support is provided with a first fixing groove, a second fixing groove, a first locking groove, a second locking groove, a limiting groove, and a guide groove along the first direction; The first contact piece is embedded in the first fixing groove, and the first contact piece has a first contact portion; The first spring sheet has a first swing end, a first locking part and a first U-shaped part arranged in sequence. The first locking part is locked in the first locking groove, and the first swing end is detachably connected to the first contact part. The second contact piece is embedded in the second fixing groove on the support, and the second contact piece has a second contact portion; The second spring has a second swing end, a second locking part and a second U-shaped part arranged in sequence. The second locking part is locked in the second locking groove, and the second swing end is detachably connected to the second contact part. The limiting member is rotatably disposed in the limiting groove. The limiting member is provided with a first limiting arm, a second limiting arm and a first hook portion. In the first direction, the first limiting arm and the first contact portion are located on both sides of the first swing end, and the second limiting arm and the second contact portion are located on both sides of the second swing end. The limiting member can move along the first direction. The pull rod is embedded in the guide groove, the return spring is compressed between the pull rod and the guide groove along the first direction, and the pull rod is provided with a second hook part, which can be detachably engaged with the first hook part; The first U-shaped portion and the second U-shaped portion pass through the current transformer, and the first U-shaped portion, the second U-shaped portion, the current transformer, and the electromagnetic driver are respectively connected to the circuit board.

2. The residual current device as described in claim 1, characterized in that, The support is provided with a limiting post along the first direction, and a locking hook is provided on the limiting post. The circuit board is provided with a limiting hole. The circuit board is fastened to the support along the first direction, and the limiting post passes through the limiting hole. The locking hook is hooked on the circuit board.

3. The residual current device as described in claim 2, characterized in that, The residual current device further includes: a first terminal block and a second terminal block; The first terminal block is electrically connected to the tail end of the first U-shaped portion, and the second terminal block is electrically connected to the tail end of the second U-shaped portion.

4. The residual current device as described in claim 3, characterized in that, The first connector and the first U-shaped part are located on opposite sides of the circuit board, and a first locking groove is provided on the circuit board, in which the first connector is snapped into the first locking groove; The second connector and the second U-shaped part are located on opposite sides of the circuit board, and a second locking groove is provided on the circuit board, in which the second connector is snapped into the second locking groove.

5. The residual current device as described in claim 4, characterized in that, The first and second connecting pieces are respectively connected to terminals.

6. The residual current device as described in claim 2, characterized in that, The support is provided with a positioning post, and the current transformer is sleeved on the positioning post.

7. The residual current device as described in claim 1, characterized in that, The first fixing groove and the second fixing groove are configured as through holes penetrating the support. The first contact piece is inserted through the first fixing groove, and the first contact portion abuts against the opening of the first fixing groove. The second contact piece is inserted through the second fixing groove, and the second contact portion abuts against the opening of the second fixing groove.

8. The residual current device as described in claim 1, characterized in that, The electromagnetic actuator includes an electromagnet coil and an electromagnet floating pin. The electromagnet coil is mounted on the support and is electrically connected to the circuit board. The electromagnet floating pin is movably disposed within the electromagnet coil, and the electromagnet floating pin is connected to the limiting member.

9. The residual current device as described in claim 8, characterized in that, The limiting member has a sliding groove along the first direction, the end of the electromagnet floating pin is embedded in the sliding groove, and the end of the electromagnet floating pin slides relative to the sliding groove.

10. The residual current device as described in any one of claims 1 to 9, characterized in that, The first swing end, the first contact portion, the second swing end, and the second contact portion are suspended outside the support.

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