A miniature residual current circuit breaker

Abstract

The application relates to a small leakage circuit breaker, belonging to the technical field of smart grids, comprising a main body, a protruding part fixed to the front side of the main body, a control handle rotatably installed on the front side of the protruding part, wiring ports arranged on the top surface and the bottom surface of the main body; detachably-installed protection shells with open backs and capable of protecting the wiring ports are arranged on the top surface and the bottom surface of the main body; a cover plate is detachably installed on the back of the protection shell, a limiting gap coinciding with the wiring port is arranged on the side edge of the protection shell facing the cover plate, an elastic limiting block capable of being clamped into the limiting gap is fixed to the cover plate, and the outer peripheral surface of an external cable penetrating through the limiting gap is abutted after the cover plate is completely installed; in the application, the protection shell and the cover plate form a double-protection structure, and the path through which impurities such as rainwater and dust penetrate into the wiring port and the inside of the main body through the gap is blocked.

Description

Technical Field

[0001] This application relates to the technical field of smart grids, and in particular to a miniature residual current circuit breaker. Background Technology

[0002] In the construction of smart grids and the upgrading of rural power distribution systems, miniature residual current circuit breakers (MRCBs) are one of the core components for ensuring electrical safety. Their main function is to monitor leakage current in the circuit in real time. When the current abnormally exceeds a set threshold, they can quickly disconnect the circuit, effectively preventing electric shock accidents and electrical fires. With the increasing electricity demand in rural areas, the application scenarios of miniature MRCBs are constantly expanding. They not only need to be adapted to standardized installation in indoor meter boxes but are also frequently used in outdoor temporary power supply scenarios such as courtyards and farm machinery sheds. The design of these circuit breakers must balance ease of installation and environmental adaptability to meet the safe electricity needs in different scenarios. Their performance stability is directly related to the user's electrical safety and the reliable operation of the power grid.

[0003] Currently, mainstream miniature residual current circuit breakers (RCCBs) have standardized structural designs. These circuit breakers typically consist of a main body with multiple wiring ports on the top and bottom for connecting external cables. An external manual operating handle is rotatably mounted on the front for easy manual closing or opening. The back side features a specially designed dovetail notch structure. During installation, workers first connect and secure the external cables through the wiring ports. Then, they align the dovetail notch on the back of the circuit breaker with the pre-installed dovetail slide rail inside the meter box and slide it in place to complete the installation.

[0004] In non-standard outdoor applications in rural areas, some rural users, in order to reduce installation costs or simplify construction processes, omit necessary protective devices such as distribution boxes and directly fix the circuit breaker under the eaves of their open yards. Although the eaves can block some sunlight and vertical rain, in rainy and windy weather, rainwater can easily splash onto the circuit breaker's terminals and cable connections, causing internal water ingress or dampness. This can lead to short circuits, leakage, and other faults, and in severe cases, trigger leakage protection failure, increasing the risk of electric shock for users. There is room for improvement in this area. Summary of the Invention

[0005] The purpose of this application is to provide a small residual current circuit breaker to solve the problem in the above-mentioned related technologies where rainwater can easily splash onto the circuit breaker's terminals and cable connections when the circuit breaker is directly fixed under the eaves, causing a malfunction.

[0006] The miniature residual current circuit breaker provided in this application adopts the following technical solution:

[0007] A miniature residual current circuit breaker includes a main body. A protrusion is fixedly provided on the front side of the main body, and a control handle is rotatably mounted on the front side of the protrusion. Wiring ports are provided on the top and bottom surfaces of the main body. Protective shells with open back sides that protect the wiring ports are detachably mounted on the top and bottom surfaces of the main body. A cover plate is detachably mounted on the back side of the protective shell. A limiting notch coinciding with the wiring port is provided on the side edge of the protective shell facing the cover plate. An elastic limiting block that can be engaged with the limiting notch is fixed on the cover plate. After the cover plate is installed, the elastic limiting block presses against the outer periphery of the external cable passing through the limiting notch.

[0008] By adopting the above technical solution, the protective shell and the cover plate form a double protection structure. First, the protective shell provides basic shielding for the wiring port to prevent rainwater from splashing directly. When the cover plate seals the opening on the back of the protective shell, the elastic limit block accurately engages with the limit notch and tightly presses against the outer circumference of the external cable, effectively filling the gap between the cable and the notch and blocking the path of rainwater, dust and other impurities to seep into the wiring port and the interior of the main body through the gap. This reduces the risk of short circuits, leakage and other faults from the source and is suitable for non-standard installation scenarios without distribution boxes under the eaves of rural outdoor houses.

[0009] Optionally, the protective shell has limiting strips fixed on opposite sides of the side facing the main body, and limiting grooves for the limiting strips to slide into are provided on the upper and lower parts of the left and right vertical sides of the main body; locking plates are fixed on opposite sides of the cover plate, and locking hooks are fixed on the sides of the two locking plates that are close to each other; locking grooves are provided on the outer periphery of the protective shell; the locking hooks are engaged in the locking grooves when the cover plate seals the opening on the back side of the protective shell.

[0010] By adopting the above technical solution, rapid positioning and installation of the protective shell and the main body are achieved; the locking hook and locking slot interlocking structure can firmly fix the cover plate and the protective shell, ensuring a sealing and protective effect. The overall assembly is convenient and the connection is reliable, which not only ensures the protective stability during outdoor use, but also facilitates later disassembly and maintenance.

[0011] Optionally, the left and right sides of the protrusion are provided with a first sliding groove along the vertical direction; one side edge of the cover plate is rotatably connected to the back edge of the main body, and a limit slot is provided on the left and right vertical sides of the main body; the protective shell can protect the control handle when the circuit breaker is transported, the limit strip is inserted into the first sliding groove at this time, the cover plate is rotated towards the main body to the horizontal state of the connection port protection, and the locking hook is inserted into the limit slot at this time.

[0012] By adopting the above technical solution, during transportation, the protective shell is engaged with the first sliding groove protective control handle by the limit strip. After the cover plate rotates, the locking hook engages with the limit slot to block the wiring port. This eliminates the need for additional protective parts, reduces the transportation volume, and provides double protection to prevent damage to components during transportation, thereby improving transportation safety and convenience.

[0013] Optionally, the limiting strip is provided with an elastic snap-fit ​​component, and the inner walls of the limiting slide groove and the first slide groove are provided with positioning grooves for the elastic snap-fit ​​component to snap into.

[0014] By adopting the above technical solution, the cooperation between the elastic snap-fit ​​component and the positioning groove can achieve stable positioning when the protective shell is protecting the connection port and when protecting the control handle, respectively, preventing accidental displacement. No additional locking components are required, switching is convenient and positioning is reliable, ensuring protective effectiveness in different scenarios while simplifying the operation process and improving ease of use.

[0015] Optionally, the elastic snap-fit ​​component includes a compression spring and an arc-shaped protrusion. The limiting strip has a placement groove for the compression spring and the arc-shaped protrusion to be inserted. The compression spring squeezes one side of the arc-shaped protrusion, causing a part of the arc-shaped protrusion to protrude from the opening of the placement groove. The outer surface of the protruding part of the arc-shaped protrusion is an arc surface, and the arc length corresponding to this arc surface is a minor arc.

[0016] By adopting the above technical solution, the compression spring provides continuous elastic force, allowing the arc-shaped protrusion to stably engage with the groove for positioning. The protrusion's arc surface design (minor arc) allows the protrusion to smoothly slide into / out of the groove when the protective shell switches states, without additional operation. The overall structure is simple, reliable, and has low wear, ensuring both stable positioning and improving the convenience of state switching and component durability.

[0017] Optionally, extension plates are rotatably connected to both the left and right sides of the cover plate. The extension plates have fixed through holes, and magnetic blocks are embedded on the side edges of the extension plates away from the cover plate. When the cover plate seals the opening on the back side of the protective shell, the extension plates can rotate to a state flush with the back side of the main body. At this time, the fixed through holes can be used to allow screws to pass through and be screwed into the wall. When the cover plate seals the wiring port, the extension plates can rotate to a horizontal state that abuts against the top surface of the cover plate. At this time, the two magnetic blocks abut against each other and attract each other.

[0018] By adopting the above technical solution, the circuit breaker can be rotated to be flush with the back of the main body during use, and the fixing through hole can be used with screws to complete the wall mounting of the circuit breaker without the need for additional mounting parts; during transportation, it can be rotated to be abutted against the top surface of the cover plate, and the magnetic block will attract and fix it, reducing the overall size. The rotating design of the extension plate takes into account both the convenience of installation and the optimization of transportation space. The magnetic fixation is stable and reliable, which not only improves the installation flexibility of the circuit breaker, but also reduces transportation costs, simplifies the structure, and enhances practicality.

[0019] Optionally, the upper and lower parts of the main body are provided with connecting rods and two elastic telescopic rods. One end of each elastic telescopic rod is rotatably connected to the left and right vertical sides of the main body, and both ends of the connecting rod are fixedly connected to the other ends of the two elastic telescopic rods. The elastic telescopic rods have an elastic force that allows them to actively extend. When the circuit breaker needs to be temporarily moved, the two elastic telescopic rods can rotate to a horizontal state in the direction towards the back of the main body, allowing the two connecting rods to be gripped by the operator. When the circuit breaker is in use, the two elastic telescopic rods can rotate to a vertical state in opposite directions, with the relatively close sides of the two connecting rods abutting against the mutually distant sides of the two protective shells. When the protective shells protect the control handle, the two elastic telescopic rods can rotate to a horizontal state in the direction towards the front of the main body, with the inner sides of the two connecting rods abutting against the front sides of the two protective shells.

[0020] By adopting the above technical solution, the flexible telescopic rod and the connecting rod are reused for multiple functions, serving the dual purpose of temporary handling and protective reinforcement: during temporary handling, the two flexible telescopic rods are rotated to a horizontal abutment state, and the connecting rod acts as a handle, making it convenient for workers to hold and carry without the need for additional tools; when the circuit breaker is used or the protective shell protects the control handle, the flexible telescopic rod can be rotated at different angles to make the connecting rod press against the outside or front of the protective shell respectively, forming a stable pressing effect with the active extension force of the flexible telescopic rod, preventing the protective shell from shifting during use or transportation, and ensuring the reliability of protection.

[0021] Optionally, a positioning block is fixed on the connecting rod, and a first slot is opened on the outer side of the protective shell. When the protective shell is protecting the connection port, the positioning block can be engaged into the first slot as the elastic telescopic rod rotates.

[0022] By adopting the above technical solution, the relative position of the connecting rod and the protective shell is further locked when the protective shell is used to protect the connection port. With the clamping force of the elastic telescopic rod and the limiting effect of the snap-fit ​​structure, the protective shell is doubly guaranteed to be stable and not loose, improving the reliability of protection in the usage scenario without increasing the complexity of operation.

[0023] Optionally, the positioning block can be engaged in the first slot as the elastic telescopic rod rotates when the protective shell protects the control handle.

[0024] By adopting the above technical solution, when the protective shell switches to the control handle protection state, the positioning block simultaneously engages with the first slot, forming a double fixation with the clamping force of the elastic telescopic rod. This not only prevents the protective shell from shifting or detaching during transportation or handling, ensuring continuous protection of the control handle, but also eliminates the need for additional operations, making switching convenient and improving structural stability in different scenarios.

[0025] Optionally, the two elastic telescopic rods can be rotated to a vertical position in opposite directions during the packaging and transportation of the circuit breaker, and the relatively close sides of the two connecting rods at this time abut against the mutually distant sides of the two extension plates; the extension plates are provided with a second slot on the mutually distant sides when the cover plate seals the connection port, and the positioning block can be inserted into the second slot when the connecting rod abuts against the extension plate.

[0026] By adopting the above technical solution, during transportation, the elastic telescopic rod rotates to a vertical position, causing the connecting rod to press against the extension plate, and the positioning block engages with the second slot, forming a double fixation. This not only prevents the cover plate from shifting during transportation, thus avoiding failure of the wiring port protection, but also eliminates the need for additional fasteners, ensuring reliable transportation protection. Furthermore, it simplifies operation and further optimizes the transportation experience.

[0027] In summary, this application includes the following beneficial technical effects:

[0028] In this application, the protective shell and the cover plate form a double protective structure. First, the protective shell provides basic shielding for the wiring port to prevent rainwater from splashing directly. When the cover plate seals the opening on the back of the protective shell, the elastic limiting block accurately engages with the limiting notch and tightly presses against the outer circumference of the external cable, effectively filling the gap between the cable and the notch and blocking the path of rainwater, dust and other impurities to seep into the wiring port and the interior of the main body through the gap. This reduces the risk of short circuits, leakage and other faults from the source and is suitable for non-standard installation scenarios without distribution boxes under the eaves of rural outdoor houses. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0030] Figure 2 This is a partial structural diagram illustrating the installation and fit of the protective shell in an embodiment of this application;

[0031] Figure 3 This is an exploded structural diagram illustrating the installation and distribution of the protective shell and cover plate in an embodiment of this application;

[0032] Figure 4 This application's embodiment illustrates a partial cross-sectional structural diagram showing the installation and fit of the protective shell and cover plate;

[0033] Figure 5 This is an exploded structural diagram illustrating the installation and distribution of the protective shell and locking plate in an embodiment of this application;

[0034] Figure 6 This is a schematic diagram illustrating the structure of the protective shell protecting the front side of the protrusion in an embodiment of this application;

[0035] Figure 7 This application's embodiments illustrate a partial cross-sectional view of the flexible snap-fit ​​installation and fit;

[0036] Figure 8yes Figure 7 An enlarged schematic diagram of part A in the middle;

[0037] Figure 9 This is a schematic diagram illustrating the installation and assembly of the extension plate in an embodiment of this application;

[0038] Figure 10 This is a schematic diagram illustrating the installation and assembly of the traction component in an embodiment of this application;

[0039] Figure 11 This is a schematic diagram illustrating the structure of the connecting rod when it is located in front of the protrusion, according to an embodiment of this application.

[0040] Figure 12 This is a schematic diagram illustrating the structure of the elastic telescopic rod in a vertical state according to an embodiment of this application.

[0041] In the diagram, 1. Main body; 11. Wiring port; 12. Limiting groove; 121. Positioning groove; 13. Limiting slot; 2. Protrusion; 21. Control handle; 22. First groove; 3. Protective shell; 31. Limiting notch; 32. Limiting strip; 321. Placement slot; 33. Elastic snap-fit ​​component; 331. Compression spring; 332. Arc-shaped protrusion; 34. Locking slot; 35. First slot; 4. Cover plate; 41. Elastic limiting block; 42. Locking plate; 421. Locking hook; 5. Extension plate; 51. Fixing through hole; 52. Magnetic block; 53. Second slot; 6. Traction assembly; 61. Connecting rod; 611. Positioning block; 62. Elastic telescopic rod. Detailed Implementation

[0042] The present application will be further described in detail below with reference to all the accompanying drawings.

[0043] Example:

[0044] Reference Figure 1 , Figure 2 and Figure 3 A small residual current circuit breaker includes a main body 1, a protrusion 2 fixedly provided on the front side of the main body 1, a control handle 21 rotatably mounted on the front side of the protrusion 2, and two wiring ports 11 opened on the top and bottom surfaces of the main body 1; a protective shell 3 with an opening on the back side and protecting the wiring ports 11 can be detachably installed on the top and bottom surfaces of the main body 1.

[0045] A cover plate 4 is detachably installed on the back side of the protective shell 3. A limiting notch 31 that coincides with the wiring port 11 is opened on the side edge of the protective shell 3 facing the cover plate 4. An elastic limiting block 41 that can be inserted into the limiting notch 31 is fixed on the cover plate 4. The elastic limiting block 41 is made of rubber.

[0046] After the protective shell 3 is used to protect the connection port 11 and the cover plate 4 is used to seal the opening on the back side of the protective shell 3, the elastic limiting block 41 is simultaneously inserted into the limiting notch 31 to press the outer periphery of the external cable that passes through the limiting notch 31, reduce the gap between the external cable and the limiting notch 31, and reduce the possibility of external impurities entering the main body 1 from the connection port 11.

[0047] Reference Figure 3 and Figure 4 On the sides of the protective shell 3 facing the main body 1, there are integrally formed limiting strips 32. The upper and lower parts of the left and right vertical sides of the main body 1 are provided with limiting grooves 12 for the limiting strips 32 to slide into. On the opposite sides of the cover plate 4, there are locking plates 42. On the sides of the two locking plates 42 that are close to each other, there are locking hooks 421. On the outer periphery of the protective shell 3, there are locking grooves 34. When the cover plate 4 seals the opening on the back side of the protective shell 3, the locking hooks 421 are simultaneously engaged in the locking grooves 34.

[0048] Reference Figure 4 , Figure 5 and Figure 6 The left and right sides of the protrusion 2 are provided with a first sliding groove 22 along the vertical direction; one side edge of the cover plate 4 is rotatably connected to the back edge of the main body 1, and a limit slot 13 is provided on the left and right vertical sides of the main body 1.

[0049] During the packaging and transportation of the circuit breaker, the protective shell 3 can protect the control handle 21, and the limit strip 32 is inserted into the first slide groove 22 at this time; and the cover plate 4 is rotated towards the main body 1 to a horizontal state to protect the wiring port 11, and the locking hook 421 is inserted into the limit slot 13 at this time; by adjusting the state of the protective shell 3 and the cover plate 4, the control handle 21 and the wiring port 11 can be protected, and the overall packaging and transportation volume can be reduced.

[0050] Reference Figure 7 and Figure 8 The limiting strip 32 is provided with an elastic locking member 33, and the inner walls of the limiting slide groove 12 and the first slide groove 22 are provided with positioning grooves 121 for the elastic locking member 33 to be inserted into. When the protective shell 3 protects the connection port 11, the elastic locking member 33 is inserted into the corresponding positioning groove 121. When the protective shell 3 protects the control handle 21, the elastic locking member 33 is inserted into the corresponding positioning groove 121.

[0051] The elastic snap-fit ​​component 33 includes a compression spring 331 and an arc-shaped protrusion 332. The limiting snap-fit ​​strip 32 has a placement groove 321 for the compression spring 331 and the arc-shaped protrusion 332 to be inserted. The compression spring 331 squeezes one side of the arc-shaped protrusion 332, causing a part of the arc-shaped protrusion 332 to protrude from the opening of the placement groove 321. The outer surface of the protruding part of the arc-shaped protrusion 332 is an arc surface, and the arc length corresponding to this arc surface is a minor arc.

[0052] Reference Figure 9 and Figure 10 An extension plate 5 is rotatably connected to both the left and right sides of the cover plate 4. The extension plate 5 has a fixing through hole 51. A magnetic block 52 is embedded on the side edge of the extension plate 5 away from the cover plate 4. The magnetic block 52 is a conventional magnet.

[0053] When the cover plate 4 seals the opening on the back of the protective shell 3, the extension plate 5 can rotate to be flush with the back of the main body 1. The fixing through hole 51 can then be used to screw the screw through and into the wall, which is convenient for the installation and fixing of the circuit breaker. When the cover plate 4 seals the wiring port 11 (that is, for packaging and transportation), the extension plate 5 can rotate to a horizontal state that abuts against the top surface of the cover plate 4. The two magnetic blocks 52 abut against each other (interference) and attract each other, reducing the overall volume.

[0054] Reference Figure 9 , Figure 10 and Figure 11 The main body 1 is provided with a traction component 6 on its exterior. The traction component 6 includes a connecting rod 61 and two elastic telescopic rods 62 disposed on the upper and lower parts of the main body 1. One end of the two elastic telescopic rods 62 is rotatably connected to the left and right vertical sides of the main body 1, respectively. The two ends of the connecting rod 61 are fixedly connected to the other ends of the two elastic telescopic rods 62, and the elastic telescopic rods 62 have an elastic force that allows them to actively extend.

[0055] When the circuit breaker needs to be temporarily moved, the two elastic telescopic rods 62 can be rotated to a horizontal state in the direction towards the back of the main body 1. In this state, the two connecting rods 61 can be held by the staff and act as "handles".

[0056] When the circuit breaker is in use, the two elastic telescopic rods 62 can rotate to a vertical position in opposite directions, and the relatively close sides of the two connecting rods 61 at this time abut against the mutually distant sides of the two protective shells 3; when the protective shells 3 protect the control handle 21, the two elastic telescopic rods 62 can rotate to a horizontal position in the direction towards the front of the main body 1, and the inner sides of the two connecting rods 61 at this time abut against the front sides of the two protective shells 3.

[0057] Reference Figure 9 , Figure 10 and Figure 11A positioning block 611 is fixed on the connecting rod 61, and a first slot 35 is provided on the outer side of the protective shell 3. When the protective shell 3 protects the connection port 11, the positioning block 611 can be locked into the first slot 35 as the elastic telescopic rod 62 rotates. When the protective shell 3 protects the control handle 21, the positioning block 611 can also be locked into the first slot 35 as the elastic telescopic rod 62 rotates.

[0058] Reference Figure 11 and Figure 12 The extension plate 5 has a second slot 53 on the side of the two cover plates 4 that are far apart when they are sealed to the connection port 11. When the circuit breaker is packaged and transported, the two elastic telescopic rods 62 can also rotate to a vertical position in opposite directions. At this time, the side of the two connecting rods 61 that are relatively close to each other abuts against the side of the two extension plates 5 that are far apart from each other, and at this time the positioning block 611 is simultaneously inserted into the second slot 53.

[0059] The implementation principle of this application embodiment is as follows:

[0060] Normal operating condition: The protective shell 3 slides into the limiting groove 12 of the main body 1 through the limiting clip 32, and the elastic snap-fit ​​33 is fixed in the corresponding positioning groove 121, protecting the connection port 11; the cover plate 4 covers the back side of the protective shell 3, the locking hook 421 is engaged in the locking groove 34, and the elastic limiting block 41 abuts against the external cable to prevent impurities. The extension plate 5 is rotated to be flush with the back side of the main body 1, and the screw is screwed into the wall through the fixing through hole 51 to fix the circuit breaker; the elastic telescopic rod 62 is rotated to be vertical, the connecting rod 61 abuts against the protective shell 3, and the positioning clip 611 is engaged in the first clip groove 35 on the protective shell 3.

[0061] Packaging and transportation status: The limiting strip 32 of the protective shell 3 slides into the first groove 22 on the protrusion 2, and the elastic snap-fit ​​33 snaps into the corresponding positioning groove 121 to protect the control handle 21; the cover plate 4 rotates to the horizontal position to block the wiring port 11, the locking hook 421 snaps into the limiting groove 13 on the main body 1, the extension plates 5 rotate in opposite directions, and the magnetic block 52 is attracted. The elastic telescopic rod 62 can be rotated to the horizontal position (the connecting rod 61 abuts against the front of the protective shell 3, and the positioning block 611 snaps into the first groove 35) or vertical position (the connecting rod 61 abuts against the extension plate 5, and the positioning block 611 snaps into the second groove 53 on the extension).

[0062] Temporary handling configuration: The elastic telescopic rod 62 rotates to the back of the main body 1 to a horizontal position and abuts against it. The two connecting rods 61 act as handles for gripping, making it convenient for staff to move the circuit breaker.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A miniature residual current circuit breaker, comprising a main body (1), wherein a protrusion (2) is fixedly provided on the front side of the main body (1), and a control handle (21) is rotatably mounted on the front side of the protrusion (2); and wiring ports (11) are provided on both the top and bottom surfaces of the main body (1); characterized in that, The top and bottom surfaces of the main body (1) are each detachably fitted with a protective shell (3) with an open back side and a protective connection port (11); a cover plate (4) is detachably fitted on the back side of the protective shell (3); a limiting notch (31) that coincides with the connection port (11) is provided on the side edge of the protective shell (3) facing the cover plate (4); an elastic limiting block (41) that can be inserted into the limiting notch (31) is fixed on the cover plate (4); after the cover plate (4) is installed, the elastic limiting block (41) will press against the outer periphery of the external cable that passes through the limiting notch (31); The protective shell (3) has limiting strips (32) fixed on the opposite sides of the side facing the main body (1). The upper and lower parts of the left and right vertical sides of the main body (1) have limiting grooves (12) for the limiting strips (32) to slide into. The cover plate (4) has locking plates (42) fixed on the opposite sides. The sides of the two locking plates (42) that are close to each other are fixed with locking hooks (421). The outer periphery of the protective shell (3) has locking grooves (34). The locking hooks (421) are engaged in the locking grooves (34) when the cover plate (4) blocks the opening on the back side of the protective shell (3). The protrusion (2) has a first sliding groove (22) on its left and right sides along the vertical direction; one side edge of the cover plate (4) is rotatably connected to the back edge of the main body (1); the main body (1) has a limit slot (13) on its left and right vertical sides; the protective shell (3) can protect the control handle (21) when the circuit breaker is transported; the limit strip (32) is inserted into the first sliding groove (22) at this time; the cover plate (4) is rotated towards the main body (1) to the horizontal state of the connection port (11); the locking hook (421) is inserted into the limit slot (13) at this time. The cover plate (4) is rotatably connected to the left and right sides of the cover plate (4). The extension plate (5) is provided with a fixing through hole (51). The side edge of the extension plate (5) away from the cover plate (4) is embedded with a magnetic block (52). When the cover plate (4) blocks the back opening of the protective shell (3), the extension plate (5) can rotate to a state flush with the back of the main body (1). The fixing through hole (51) can be used to allow screws to pass through and be screwed into the wall. When the cover plate (4) blocks the wiring port (11), the extension plate (5) can rotate to a horizontal state that abuts against the top surface of the cover plate (4). The two magnetic blocks (52) abut against each other and attract each other.

2. The miniature residual current circuit breaker according to claim 1, characterized in that, The limiting strip (32) is provided with an elastic snap-fit ​​member (33), and the inner walls of the limiting slide groove (12) and the first slide groove (22) are provided with positioning grooves (121) for the elastic snap-fit ​​member (33) to be snapped into.

3. A miniature residual current circuit breaker according to claim 2, characterized in that, The elastic snap-fit ​​component (33) includes a compression spring (331) and an arc-shaped protrusion (332). The limiting snap-fit ​​strip (32) has a placement groove (321) for the compression spring (331) and the arc-shaped protrusion (332) to be inserted. The compression spring (331) squeezes one side of the arc-shaped protrusion (332) so that a part of the arc-shaped protrusion (332) protrudes from the opening of the placement groove (321). The outer side of the protruding part of the arc-shaped protrusion (332) is an arc surface, and the arc length corresponding to the arc surface is a minor arc.

4. A miniature residual current circuit breaker according to claim 1, characterized in that, The main body (1) is provided with a connecting rod (61) and two elastic telescopic rods (62) at both the upper and lower parts. One end of each elastic telescopic rod (62) is rotatably connected to the left and right vertical sides of the main body (1), and the two ends of the connecting rod (61) are fixedly connected to the other ends of the two elastic telescopic rods (62). The elastic telescopic rods (62) have an elastic force that allows them to actively extend. When the circuit breaker needs to be temporarily moved, the two elastic telescopic rods (62) can rotate to a horizontal position in the direction facing the back of the main body (1). In this state, the two connecting rods (61) can be held by the staff; when the circuit breaker is used, the two elastic telescopic rods (62) can be rotated to a vertical state in opposite directions, and the relatively close sides of the two connecting rods (61) at this time abut against the mutually distant sides of the two protective shells (3); when the protective shells (3) protect the control handle (21), the two elastic telescopic rods (62) can be rotated to a horizontal state in the direction towards the front of the main body (1), and the inner sides of the two connecting rods (61) at this time abut against the front sides of the two protective shells (3).

5. A miniature residual current circuit breaker according to claim 4, characterized in that, The connecting rod (61) is fixed with a positioning block (611), and the outer side of the protective shell (3) is provided with a first slot (35). When the protective shell (3) is protecting the connection port (11), the positioning block (611) can be inserted into the first slot (35) as the elastic telescopic rod (62) rotates.

6. A miniature residual current circuit breaker according to claim 5, characterized in that, The positioning block (611) can be engaged in the first slot (35) as the elastic telescopic rod (62) rotates when the protective shell (3) protects the control handle (21).

7. A miniature residual current circuit breaker according to claim 5, characterized in that, The two elastic telescopic rods (62) can be rotated to a vertical position in opposite directions during the packaging and transportation of the circuit breaker, and the relatively close sides of the two connecting rods (61) at this time abut against the mutually distant sides of the two extension plates (5). The extension plate (5) has a second slot (53) on the side of the cover plate (4) that is far away from the connection port (11) when they are sealed. The positioning block (611) can be inserted into the second slot (53) when the connecting rod (61) abuts against the extension plate (5).

Images