An electric leakage protector

Abstract

The utility model provides a kind of leakage protection circuit breaker, including shell, first shell cover located the two sides of shell, second shell cover, contact component and operating device, still including test device and arc extinguishing device, the two sides of shell are respectively provided with the first installation groove of being matched with first shell cover to form first installation cavity and the second installation groove of being matched with second shell cover to form second installation cavity, the test device includes test button movably installed in second installation groove, movable contact piece connected in test button bottom, reset spring below test button, first static contact piece, second static contact piece respectively below two ends of movable contact piece and the power connection component electrically connected with first static contact piece,second static contact piece, the arc extinguishing device includes first arc extinguishing system in first installation groove and second arc extinguishing system in second installation groove.The utility model test device is stable, reliable, and high safety, and arc extinguishing device simple structure, it is convenient to install.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a residual current circuit breaker. Background Technology

[0002] Residual current circuit breakers (RCCBs) provide overload, short-circuit, and residual current protection, thus combining the functions of a circuit breaker and a residual current device. Therefore, RCCBs are commonly used protective devices in electrical circuits, widely used in portable electrical equipment and handheld power tools; electrical equipment installed in harsh environments such as dampness and strong corrosion; electrical construction machinery on construction sites; socket circuits in buildings such as schools, businesses, and residences; underwater lighting equipment in swimming pools, fountains, and bathhouses; power supply lines and equipment installed underwater; and electrical medical equipment in hospitals that comes into direct contact with the human body.

[0003] The existing Chinese patent application number CN201720387708.6, entitled "A Circuit Breaker," discloses: "A circuit breaker, comprising a base, a middle seat, a top cover, a tripping mechanism, an arc-extinguishing device, a bimetallic strip, a moving contact assembly, a stationary contact, and a handle, wherein the base divides the space between the base and the top cover into two parts, the space between the middle seat and the top cover being the first space, and the space between the middle seat and the base being the second space. The arc-extinguishing device, the bimetallic strip, and the moving contact assembly are disposed in the first space, and a circuit board for controlling leakage current is disposed in the second space. The feature is that: a groove is provided on the middle seat on the side of the first space, and an insulating pull rod is disposed in the groove. One end of the insulating pull rod engages with the bimetallic strip, and the other end engages with the front end of the rotating arm in the moving contact assembly. The bimetallic strip bends, causing the insulating pull rod to move and the rotating arm to rotate, thereby realizing the rotation of the moving contact assembly." The circuit breaker also includes a test button device, which comprises a button, a torsion spring, and a conductive plate. The button includes a pressing part and a resisting part. The pressing part is telescopically positioned in an opening in the base, while the resisting part is located inside the base. The upper end of the resisting part is integrally connected to the pressing part, and a boss with a slot is provided on one side of its lower end. The torsion spring's central loop is fitted onto a protrusion in the base. The first extension arm of the torsion spring is connected to a conductor in the circuit breaker, and the second extension arm is engaged in the slot. The conductive plate is located below the button, and the second extension arm can achieve electrical connection with the conductive plate when the button is pressed. A sliding block extends from one side of the boss, and a sliding groove is provided on the base to cooperate with the sliding block. The sliding block and sliding groove cooperate to guide the button's sliding movement. However, the test button only has one contact point where the torsion spring and conductive plate abut against each other, resulting in low stability and a short creepage distance, thus reducing its safety.

[0004] The existing Chinese patent application number CN202110957981.9, entitled "A Residual Current Circuit Breaker," discloses: "A first arc-extinguishing system is provided between the L-stage housing and the intermediate housing, and a second arc-extinguishing system is provided between the N-stage housing and the intermediate housing. The first arc-extinguishing system includes a first arc-extinguishing cover and a first arc-extinguishing plate disposed within the first arc-extinguishing cover. The first arc-extinguishing cover is formed by connecting a first side plate, a second side plate, and a third side plate. The first side plate and the second side plate are arranged in parallel, and the third side plate is located at one end of the first side plate and the second side plate." The side plate has gas-generating holes, and the first arc-extinguishing plate has 9-11 pieces. The second arc-extinguishing system includes a second arc-extinguishing cover and second arc-extinguishing plates disposed inside the second arc-extinguishing cover. The second arc-extinguishing cover is formed by connecting a fourth side plate, a fifth side plate, and a sixth side plate. The fourth side plate and the fifth side plate are arranged parallel to each other, and the sixth side plate is located at one end of the fourth and fifth side plates. The sixth side plate has gas-generating holes, and the number of second arc-extinguishing plates is set to 14 pieces. The second arc-extinguishing cover has a complex structure, occupies a large space, and is difficult to install, thus increasing the overall product volume and reducing production efficiency. Utility Model Content

[0005] Based on the above problems, the purpose of this utility model is to provide a leakage current protection circuit breaker that is stable, reliable, and highly safe in the testing device, and has a simple arc extinguishing device structure that is easy to install.

[0006] To address the above problems, the following technical solution is provided: a residual current circuit breaker, comprising a housing, a first housing cover and a second housing cover located on both sides of the housing, a short-circuit protection device, an overload protection device, contact components, and an operating device. The contact components include a moving contact and a stationary contact. The operating device controls the displacement of the moving contact to achieve opening or closing. It also includes a testing device and an arc-extinguishing device. The housing has a first mounting groove on each side that mates with the first housing cover to form a first mounting cavity, and a second mounting groove that mates with the second housing cover to form a second mounting cavity. The contact components are provided in two sets, respectively... The test device, installed in the first and second mounting slots, includes a test button movably installed in the second mounting slot, a movable contact connected to the bottom of the test button, a return spring located below the test button, a first stationary contact and a second stationary contact located at opposite ends below the movable contact, and a power connection assembly electrically connected to the first and second stationary contacts. The housing has a sliding groove that slides to engage with the test button. The return spring is installed in the sliding groove and abuts against the test button. The housing also has a first slot that engages with the first stationary contact and a second slot that engages with the second stationary contact. The arc extinguishing device includes a first arc extinguishing system located in a first mounting slot and a second arc extinguishing system located in a second mounting slot. The first arc extinguishing system includes an arc extinguishing cover and a plurality of first arc extinguishing plates disposed within the arc extinguishing cover. The second arc extinguishing system includes a plurality of second arc extinguishing plates. An arc extinguishing channel is provided in the second mounting slot, and positioning slots for mounting a plurality of second arc extinguishing plates are provided in the arc extinguishing channel at intervals.

[0007] In the above structure, when the operating device controls the moving contact to close, the moving contact abuts against the stationary contact, and the energizing component is electrically connected to the second stationary contact. Pressing the test button causes the moving contact to move downwards until its two ends abut against the first and second stationary contacts respectively, thus establishing circuit continuity for testing the circuit breaker. When the circuit breaker is open, the circuit of the energizing component is in an open state. Therefore, pressing the button ensures that the test circuit is never energized, making it very safe and reliable, regardless of whether the moving contact is energized. The inclusion of a reset spring facilitates the reset of the test button, improving the ease of operation. The inclusion of a sliding groove facilitates the displacement of the test button, thereby improving the stability of the button's displacement. By configuring the moving contact to cooperate with the first and second stationary contacts at both ends, conduction is achieved only when the moving contact contacts the first and second stationary contacts are in contact. When the moving contact contacts separate from the first and second stationary contacts, the distance between them is increased exponentially, thereby expanding the creepage distance and improving the safety and reliability of this invention. The first and second slots facilitate the installation of the first and second stationary contacts, improving their stability. The second arc-extinguishing system can achieve arc extinguishing using several second arc-extinguishing contacts, thus reducing operating costs, facilitating installation, and reducing the installation space required for the second arc-extinguishing system, thereby reducing the overall size of the product. The positioning slots facilitate the positioning and installation of the second arc-extinguishing contacts, improving the ease of installation and enhancing the reliability of this invention. The first and second mounting slots on the housing facilitate the installation of components and allow workers to open the first or second housing cover to fully view the internal structure, which is convenient for disassembly and maintenance, thus improving the reliability and ease of use of this utility model.

[0008] The present invention is further configured such that the operating device includes an operating handle pivotally connected to the housing, a contact bracket pivotally connected to the housing and located below the operating handle, a jumper pivotally connected to the bracket, a locking buckle pivotally connected to the bracket and located on the side of the jumper facing the stationary contact, and connecting rods with their two ends respectively connected to the operating handle and the jumper. The moving contacts of the two sets of contact components are respectively pivotally connected to both sides of the contact bracket. The contact bracket is provided with a push rod passing through the first mounting groove to the second mounting groove. The housing is provided with an arc-shaped opening adapted to the push rod. The power connection component includes a power connection torsion spring installed in the second mounting groove and a power connection piece embedded in the housing. One end of the power connection torsion spring abuts against the push rod to form a movable end, and the other end abuts against the bottom of the second stationary contact piece to form a fixed end. The movable end is linked with the push rod to realize the separation and connection with the power connection piece.

[0009] In the above structure, when the circuit is closed via the operating handle, the push rod pushes the movable end of the electrical torsion spring to displace, causing it to abut against the electrical contact piece, thus establishing the circuit between the second stationary contact piece and the electrical contact piece. When the circuit is opened, the contact bracket drives the moving contact to reset, the push rod resets along with the contact bracket, and the movable end of the electrical torsion spring resets through its torque. By setting the electrical torsion spring to be linked with the contact bracket, the test circuit is de-energized after the circuit is opened, improving the safety of the invention. The cooperation between the electrical torsion spring and the electrical contact piece reduces the installation space, thereby saving internal space in the second mounting slot, correspondingly reducing the overall size of the invention and lowering production costs.

[0010] The present invention is further configured such that a positioning post protrudes from the bottom of the test button, the movable contact piece is sleeved on the positioning post, one end of the reset spring is sleeved on the positioning post and abuts against the movable contact piece, and the other end abuts against the bottom of the slide groove.

[0011] In the above structure, the connection strength between the moving contact and the test button can be improved by setting the positioning post, and the connection strength between the return spring and the test button can also be improved. This facilitates the installation of the return spring, thereby improving the structural strength of the present invention and the convenience of its production and assembly.

[0012] The present invention is further configured such that wiring holes are provided at the ends of both the first stationary contact piece and the electrical contact piece.

[0013] In the above structure, the wiring hole facilitates the connection between the first stationary contact and the contact piece, thereby improving the reliability of this utility model.

[0014] The present invention is further configured such that a wire passage is provided inside the housing on one side of the second mounting groove, and a test resistor electrically connected to the first stationary contact piece is provided in the wire passage.

[0015] The above structure can improve the stability of the test circuit of this utility model.

[0016] The present invention is further configured such that a slot is provided on the side of the top of the slide groove facing the second cover, and an insert block adapted to the slot is provided on the second cover.

[0017] In the above structure, the stability of the test button can be improved by the cooperation of the insert and the bayonet, and the connection strength between the second cover and the housing can be improved.

[0018] The present invention is further configured such that the bottom end of the test button is provided with a limiting block that cooperates with the sliding port, and the two ends of the limiting block are provided with limiting feet located inside the moving contact piece on the side facing the first shell cover.

[0019] In the above structure, the limiting block prevents the test button from detaching from the top of the slide, thereby improving the reliability of this invention. The limiting foot limits the movement of the moving contact piece and facilitates its positioning and installation, improving the ease of assembly and reliability of this invention.

[0020] The present invention is further configured such that a first dividing ridge is provided in the arc extinguishing channel, and a second dividing ridge corresponding to the first dividing ridge is provided in the second shell cover.

[0021] By adopting the above structure, the arc guiding effect of the arc extinguishing channel can be improved, which in turn facilitates the arc extinguishing of the second arc extinguishing system and improves the arc extinguishing effect of this utility model.

[0022] The present invention is further configured such that a positioning port is provided at one end of the second arc extinguishing plate, and a limiting port that cooperates with the positioning port is provided in the positioning groove.

[0023] In the above structure, the stability of the second arc-extinguishing plate can be improved by clamping it with the positioning port and the limiting port, and it can be easily positioned and installed, thus improving the reliability of this utility model.

[0024] The present invention is further provided that both sides of the housing are provided with connection holes, and both the first and second housing covers are provided with mounting holes that are connected to the connection holes by screws. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0026] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0027] Figure 3This is a schematic diagram of the internal structure of the first mounting slot in this utility model.

[0028] Figure 4 This is a schematic diagram of the internal structure of the second mounting slot in this utility model. Figure 1 .

[0029] Figure 5 This is a schematic diagram of the internal structure of the second mounting slot in this utility model. Figure 2 .

[0030] Figure 6 This is a schematic diagram of the structure of the second shell cover, the second arc extinguishing plate, and the test device in this utility model.

[0031] Figure 7 This is a schematic diagram of the structure of the first shell cover, the shell, and the second shell cover in this utility model.

[0032] Figure 8 This is a schematic diagram of the experimental device in this utility model.

[0033] Figure 9 This is a schematic diagram of the structure of the second arc-extinguishing plate in this utility model.

[0034] The labels in the diagram have the following meanings: 1-Housing; 2-First housing cover; 3-Second housing cover; 4-Short circuit protection device; 5-Overload protection device; 6-Contact assembly; 7-Operating device; 61-Moving contact; 62-Stationary contact; 8-Test device; 9-Arc extinguishing device; 11-First mounting slot; 12-Second mounting slot; 81-Test button; 82-Moving contact piece; 83-Reset spring; 84-First stationary contact piece; 85-Second stationary contact piece; 86-Electrification assembly; 13-Slide groove; 14-First slot; 15-Second slot; 91-First arc extinguishing system; 92-Second arc extinguishing system; 911-Arc extinguishing cover; 912-First arc extinguishing piece; 921-Second arc extinguishing piece; 16-Arc extinguishing channel; 161-Positioning groove; 71-Operating handle; 72-Contact bracket; 73-Tap latch; 74-Lock; 75-Connecting rod; 721-Push rod; 17-Arc-shaped opening; 861-Electrifying torsion spring; 862-Electrifying plate; 8611-Moving end; 8612-Fixed end; 811-Positioning post; 01-Wiring hole; 18-Wire passage; 02-Test resistor; 131-Bayonet; 31-Plug; 812-Limiting block; 813-Limiting foot; 18-First dividing edge; 32-Second dividing edge; 9211-Positioning port; 1611-Limiting port; 19-Connecting hole; 03-Mounting hole. Detailed Implementation

[0035] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] like Figures 1 to 9 The residual current circuit breaker shown includes a housing 1, a first cover 2 and a second cover 3 located on both sides of the housing 1, a short-circuit protection device 4, an overload protection device 5, contact components 6, and an operating device 7. The contact components 6 include a moving contact 61 and a stationary contact 62. The operating device 7 is used to control the displacement of the moving contact 61 to realize opening or closing the circuit. It also includes a testing device 8 and an arc-extinguishing device 9. The housing 1 has a first mounting groove 11 that cooperates with the first cover 2 to form a first mounting cavity and a second mounting groove 12 that cooperates with the second cover 3 to form a second mounting cavity on both sides. The contact components 6 are provided in two sets and are respectively installed in the first mounting groove 11 and the second mounting groove 12. The test device 8 includes a test button 81 movably installed in the second mounting groove 12, a movable contact 82 connected to the bottom of the test button 81, a return spring 83 located below the test button 81, a first stationary contact 84 and a second stationary contact 85 located at both ends below the movable contact 82, and a power connection component 86 electrically connected to the first stationary contact 84 and the second stationary contact 85. The housing 1 has a sliding groove 13 that slides and engages with the test button 81. The return spring 83 is installed in the sliding groove 13 and abuts and engages with the test button 81. The housing 1 has a first slot 14 that engages with the first stationary contact 84 and a second slot 15 that engages with the second stationary contact 85. The arc extinguishing device 9 includes a first arc extinguishing system 91 located in a first mounting groove 11 and a second arc extinguishing system 92 located in a second mounting groove 12. The first arc extinguishing system 91 includes an arc extinguishing cover 911 and a plurality of first arc extinguishing plates 912 disposed in the arc extinguishing cover 911. The second arc extinguishing system 92 includes a plurality of second arc extinguishing plates 921. An arc extinguishing channel 16 is provided in the second mounting groove 12. The arc extinguishing channel 16 is provided with positioning grooves 161 arranged vertically and intermittently for installing a plurality of second arc extinguishing plates 921.

[0038] In the above structure, when the operating device 7 controls the moving contact 61 to close, the moving contact 61 abuts against the stationary contact 62, and the energizing component 86 is electrically connected to the second stationary contact piece 85. When the test button 81 is pressed, the moving contact piece 82 moves downward until its two ends abut against the first stationary contact piece 84 and the second stationary contact piece 85 respectively, thus achieving circuit conduction and testing the circuit breaker. When the circuit breaker is opened, the circuit of the energizing component 86 is in an open state. Thus, when the button is pressed, the test circuit is never energized, which is very safe and reliable, and is unrelated to whether the moving contact 61 is energized or not. The reset spring 83 facilitates the reset of the test button 81, thereby improving the ease of operation of the present invention. The slide groove 13 facilitates the displacement of the test button 81, thereby improving the stability of the displacement of the test button 81. By configuring the moving contact 82 to cooperate with the first stationary contact 84 and the second stationary contact 85 at both ends, conduction can be achieved only when the moving contact 82 contacts the first stationary contact 84 and the second stationary contact 85. When the moving contact 82 separates from the first stationary contact 84 and the second stationary contact 85, the distance between them can be increased exponentially, thereby expanding the creepage distance and improving the safety and reliability of this invention. The first slot 14 and the second slot 15 facilitate the installation of the first stationary contact 84 and the second stationary contact 85, improving their stability. The second arc-extinguishing system 92 can achieve arc extinguishing using several second arc-extinguishing pieces 921, thereby reducing usage costs, facilitating installation, and reducing the installation space required for the second arc-extinguishing system 92, thus reducing the overall size of the product. The positioning slot 161 facilitates the positioning and installation of the second arc-extinguishing pieces 921, thereby improving the ease of installation and enhancing the reliability of this invention. The first mounting groove 11 and the second mounting groove 12 on the housing 1 facilitate the installation of components and allow workers to open the first housing cover 2 or the second housing cover 3 to fully view the internal structure, which facilitates disassembly and maintenance and improves the reliability and ease of use of this utility model.

[0039] In this embodiment, the operating device 7 includes an operating handle 71 pivotally connected to the housing 1, a contact bracket 72 pivotally connected to the housing 1 and located below the operating handle 71, a jumper latch pivotally connected to the bracket, a latch 74 pivotally connected to the bracket and located on the side of the jumper latch facing the stationary contact 62, and a connecting rod 75 with its two ends respectively connected to the operating handle 71 and the jumper latch. The moving contacts 61 of the two sets of contact components 6 are respectively pivotally connected to both sides of the contact bracket 72. The contact bracket 72 is provided with a through-groove from the first mounting groove 11 to the second mounting groove 1. The push rod 721 is located inside the housing 1. The housing 1 has an arc-shaped opening 17 that is adapted to the push rod 721. The power connection assembly 86 includes a power connection torsion spring 861 installed in the second mounting groove 12 and a power connection piece 862 embedded in the housing 1. One end of the power connection torsion spring 861 abuts against the push rod 721 to form a movable end 8611, and the other end abuts against the bottom of the second stationary contact piece 85 to form a fixed end 8612. The movable end 8611 is linked with the push rod 721 to realize the separation and connection with the power connection piece 862.

[0040] In the above structure, when the circuit is closed by operating the handle 71, the push rod 721 pushes the movable end 8611 of the energizing torsion spring 861 to move, causing it to abut against the energizing piece 862, thus establishing the circuit between the second stationary contact 85 and the energizing piece 862. When the circuit is opened, the contact bracket 72 drives the moving contact 61 to reset, and the push rod 721 resets along with the contact bracket 72. The movable end 8611 of the energizing torsion spring 861 is reset by its torque. By setting the energizing torsion spring 861 to be linked with the contact bracket 72, the test circuit is not energized after the circuit is opened, improving the safety of the invention. The cooperation between the energizing torsion spring 861 and the energizing piece 862 reduces the installation space, thereby saving internal space in the second mounting slot 12, correspondingly reducing the overall size of the invention and lowering production costs.

[0041] In this embodiment, the test button 81 has a protruding positioning post 811 at the bottom, the movable contact piece 82 is sleeved on the positioning post 811, one end of the reset spring 83 is sleeved on the positioning post 811 and abuts against the movable contact piece 82, and the other end abuts against the bottom of the slide groove 13.

[0042] In the above structure, by setting the positioning post 811, the connection strength between the moving contact 82 and the test button 81 can be improved, and the connection strength between the reset spring 83 and the test button 81 can be improved. This facilitates the installation of the reset spring 83, thereby improving the structural strength of the present invention and the convenience of its production and assembly.

[0043] In this embodiment, both the first static contact piece 84 and the terminal piece 862 have wiring holes 01 at their ends.

[0044] In the above structure, by providing the wiring hole 01, it is easy to connect the first stationary contact 84 to the electrical contact 862, thereby improving the reliability of this utility model.

[0045] In this embodiment, a wire passage 18 is provided inside the housing 1 on one side of the second mounting groove 12, and a test resistor 02 electrically connected to the first stationary contact piece 84 is provided in the wire passage 18.

[0046] The above structure can improve the stability of the test circuit of this utility model.

[0047] In this embodiment, the top of the slide groove 13 is provided with a slot 131 on the side facing the second cover 3, and the second cover 3 is provided with an insert block 31 that is adapted to the slot 131.

[0048] In the above structure, the stability of the test button 81 can be improved by the cooperation of the insert 31 and the bayonet 131, and the connection strength between the second cover 3 and the housing 1 can be improved.

[0049] In this embodiment, the bottom of the test button 81 is provided with a limiting block 812 that is matched with the port of the slide groove 13. The two ends of the limiting block 812 are provided with limiting feet 813 located inside the moving contact piece 82 on the side facing the first shell cover 2.

[0050] In the above structure, the limiting block 812 prevents the test button 81 from detaching from the top of the slide groove 13, thereby improving the reliability of this invention. The limiting foot 813 limits the movement of the movable contact 82 and facilitates its positioning and installation, improving the ease of assembly and reliability of this invention.

[0051] In this embodiment, the arc extinguishing channel 16 is provided with a first dividing ridge 18 protruding inside, and the second shell cover 3 is provided with a second dividing ridge 32 corresponding to the first dividing ridge 18.

[0052] By adopting the above structure, the arc guiding effect of the arc extinguishing channel 16 can be improved, which in turn facilitates the arc extinguishing of the second arc extinguishing system 92, thereby improving the arc extinguishing effect of this utility model.

[0053] In this embodiment, the second arc extinguishing plate 921 has a positioning port 9211 at one end, and the positioning groove 161 has a limiting port 1611 that cooperates with the positioning port 9211.

[0054] In the above structure, the positioning port 9211 and the limiting port 1611 cooperate to clamp the second arc extinguishing plate 921, which can improve the stability of the second arc extinguishing plate 921 and facilitate its positioning and installation, thereby improving the reliability of this utility model.

[0055] In this embodiment, the housing 1 has connection holes 19 on both sides, and the first cover 2 and the second cover 3 are both provided with mounting holes 03 that are connected to the connection holes 19 by screws.

[0056] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A residual current circuit breaker, comprising a housing, a first housing cover and a second housing cover located on both sides of the housing, a short-circuit protection device, an overload protection device, a contact assembly, and an operating device, wherein the contact assembly includes a moving contact and a stationary contact, and the operating device is used to control the displacement of the moving contact to realize opening or closing the circuit breaker, characterized in that: It also includes a testing device and an arc-extinguishing device. The housing has a first mounting groove that mates with the first housing cover to form a first mounting cavity and a second mounting groove that mates with the second housing cover to form a second mounting cavity. The contact assembly has two sets, which are respectively installed in the first mounting groove and the second mounting groove. The testing device includes a test button that is movably installed in the second mounting groove, a movable contact piece connected to the bottom of the test button, a return spring located below the test button, a first stationary contact piece and a second stationary contact piece located at both ends below the movable contact piece, and a power connection assembly electrically connected to the first stationary contact piece and the second stationary contact piece. The housing has a sliding groove that slidably mates with the test button. The return spring is installed in the sliding groove and abuts against the test button. The housing has a first slot that mates with the first stationary contact piece and a second slot that mates with the second stationary contact piece. The arc extinguishing device includes a first arc extinguishing system located in a first mounting slot and a second arc extinguishing system located in a second mounting slot. The first arc extinguishing system includes an arc extinguishing cover and a plurality of first arc extinguishing plates disposed within the arc extinguishing cover. The second arc extinguishing system includes a plurality of second arc extinguishing plates. An arc extinguishing channel is provided in the second mounting slot, and positioning slots for mounting a plurality of second arc extinguishing plates are provided in the arc extinguishing channel at intervals.

2. The residual current circuit breaker according to claim 1, characterized in that: The operating device includes an operating handle pivotally connected to the housing, a contact bracket pivotally connected to the housing and located below the operating handle, a jumper pivotally connected to the bracket, a latch pivotally connected to the bracket and located on the side of the jumper facing the stationary contact, and connecting rods with their two ends respectively connected to the operating handle and the jumper. The moving contacts of the two sets of contact components are respectively pivotally connected to both sides of the contact bracket. The contact bracket is provided with a push rod that passes through the first mounting groove to the second mounting groove. The housing is provided with an arc-shaped opening adapted to the push rod. The electrical connection component includes an electrical connection torsion spring installed in the second mounting groove and an electrical connection piece embedded in the housing. One end of the electrical connection torsion spring abuts against the push rod to form a movable end, and the other end abuts against the bottom of the second stationary contact piece to form a fixed end. The movable end is linked with the push rod to realize the separation and connection with the electrical connection piece.

3. A residual current circuit breaker according to claim 2, characterized in that: The test button has a protruding positioning post at the bottom. The moving contact is sleeved on the positioning post. One end of the reset spring is sleeved on the positioning post and abuts against the moving contact, while the other end abuts against the bottom of the slide groove.

4. A residual current circuit breaker according to claim 2, characterized in that: Both the first stationary contact piece and the terminal piece have wiring holes at their ends.

5. A residual current circuit breaker according to claim 2, characterized in that: A wire passage is provided inside the housing on one side of the second mounting slot, and a test resistor electrically connected to the first stationary contact is provided in the wire passage.

6. A residual current circuit breaker according to claim 1, characterized in that: The top of the slide is provided with a slot on the side facing the second cover, and the second cover is provided with a plug that matches the slot.

7. A residual current circuit breaker according to claim 6, characterized in that: The bottom of the test button is provided with a limiting block that cooperates with the sliding port. The two ends of the limiting block are provided with limiting feet located inside the moving contact piece on the side facing the first shell cover.

8. A residual current circuit breaker according to claim 1, characterized in that: The arc-extinguishing channel has a raised first dividing ridge, and the second shell cover has a second dividing ridge corresponding to the first dividing ridge.

9. A residual current circuit breaker according to claim 8, characterized in that: The second arc-extinguishing plate has a positioning port at one end, and a limiting port that cooperates with the positioning port is provided in the positioning groove.

10. A residual current circuit breaker according to claim 1, characterized in that: Both sides of the housing are provided with connection holes, and the first and second housing covers are provided with mounting holes that are connected to the connection holes by screws.

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