Rapid overload cut-off device for low-voltage power distribution network

Abstract

The invention discloses a low-voltage power distribution network overload rapid cut-off device which comprises a device shell, a wire inlet wiring terminal hole is formed in the left end of the front side of the device shell, a wire outlet wiring terminal hole is formed in the right end of the front side of the device shell, and a state indicator light hole and a manual reset key hole are correspondingly formed in the front side of a panel of the device shell. The main control circuit board is embedded in the middle area of the interior of the device shell, and the overload detection chip is attached to the center area of the upper surface of the main control circuit board. Power is supplied by the power module, the overload detection chip collects line current in real time, a threshold value is preset in combination with a built-in potentiometer, and an electromagnetic triggering mechanism is rapidly triggered during overload; the double-breakpoint circuit breaker is pushed to cut off the circuit, delay protection and mistaken touch prevention are achieved, a state indicator lamp feeds back the state, a manual reset key is convenient to recover, rapid overload response and thorough cut-off are achieved, safety protection and easy maintenance are achieved, and stability of a low-voltage power distribution network is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of low-voltage distribution network safety protection equipment technology, specifically a low-voltage distribution network overload rapid disconnection device. Background Technology

[0002] Low-voltage distribution networks are a crucial link connecting the power system to user terminals, and their operational stability directly affects electricity safety. Existing low-voltage distribution network overload protection devices suffer from several technical defects: First, traditional devices mostly employ mechanical triggering structures, resulting in high overload detection and disconnection response delays (typically >50ms), failing to quickly interrupt overload current and easily leading to line insulation aging, short circuits, and fires; Second, the wiring terminals lack effective insulation protection, making them prone to leakage when exposed to dusty and humid environments for extended periods, and are inconvenient to disassemble and maintain; Third, the alignment accuracy between the electromagnetic triggering mechanism and the circuit breaker linkage rod is low, easily leading to trigger failure or false triggering, affecting protection reliability; Fourth, overload threshold adjustment requires disassembly... The device is cumbersome to operate and prone to damaging internal components; fifth, single-break circuit breakers are prone to residual arcing when cutting off the circuit, posing a risk of secondary discharge; sixth, the status indication is singular, making it impossible to intuitively distinguish between normal operation and overload cut-off conditions; seventh, the elastic coefficient of the reset spring is mismatched with the trigger thrust, resulting in insensitive triggering or incomplete reset; eighth, the core electronic module has a compact layout but lacks heat dissipation design, and long-term operation is prone to performance degradation due to overheating; ninth, the spacing between the built-in potentiometer and the detection chip is unreasonable, causing interference in signal transmission and affecting detection accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a low-voltage power distribution network overload rapid disconnection device to solve the problems mentioned in the background art, such as high response delay, easy leakage of wiring terminals, inaccurate trigger alignment, cumbersome threshold adjustment, incomplete disconnection, ambiguous status indication, unreliable reset, poor heat dissipation, and signal transmission interference.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage distribution network overload rapid disconnection device, comprising a device housing, wherein an inlet terminal hole is provided on the left front end and an outlet terminal hole is provided on the right front end of the device housing, and a status indicator hole and a manual reset button hole are respectively provided on the front side of the device housing panel, wherein a main control circuit board is embedded in the central area inside the device housing, an overload detection chip is mounted on the central area of ​​the upper surface of the main control circuit board, the sides of the overload detection chip are arranged adjacently and electrically connected to built-in potentiometers, a delay protection module and a power supply module are symmetrically arranged on the upper sides of the overload detection chip, and the copper foil lines on the main control circuit board form a bidirectional electrical connection with the overload detection chip, wherein the inlet terminal hole is covered by an inlet terminal cover, the inlet terminal cover corresponding to the inlet terminal. The hole is fixedly installed on the inner side of the left end of the device housing. The outgoing terminal in the hole is covered by an outgoing terminal cover. The outgoing terminal cover is fixedly installed on the inner side of the right end of the device housing, corresponding to the outgoing terminal hole. A double-break circuit breaker is installed in the center of the bottom of the device housing. A linkage rod is vertically protruding from the top of the double-break circuit breaker. An electromagnetic trigger mechanism is vertically fixed to the lower surface of the main control circuit board. The trigger end of the lower end of the electromagnetic trigger mechanism is directly opposite the linkage rod in the vertical direction. A status indicator light is interference-fitted into the status indicator light hole. A manual reset button is snapped into the manual reset button hole. A reset spring is embedded inside the manual reset button and electrically connected to the overload detection chip. Both the status indicator light hole and the manual reset button hole are electrically connected to the overload detection chip through wires. The double-break circuit breaker is connected in series between the incoming terminal and the outgoing terminal.

[0005] The entire device is powered by a power module. An overload detection chip collects the line current signal between the incoming and outgoing terminals in real time via the copper foil circuitry of the main control circuit board. A built-in potentiometer presets an overload threshold. When the current exceeds the threshold, the overload detection chip quickly sends a trigger signal to the electromagnetic trigger mechanism. Its trigger end pushes the linkage rod of the double-break circuit breaker vertically, causing the circuit breaker to quickly trip and disconnect the main circuit. A status indicator simultaneously reflects the overload tripping status. After the fault is cleared, a manual reset button triggers the reset spring, causing the circuit breaker to close and restore power. A time-delay protection module prevents false triggering caused by instantaneous current fluctuations. This design creates a complete closed loop of detection-trigger-tripping-indication-reset. The compact layout and precise alignment of each structure achieve overload response delay, solving the problems of slow response, loose structure, and limited functionality in traditional devices, while balancing rapid protection with ease of operation.

[0006] As a preferred embodiment of the present invention, both the inlet terminal cover and the outlet terminal cover are detachable semi-enclosed shell structures, and their inner walls are fitted with an insulating liner.

[0007] As a preferred embodiment of the present invention, the trigger end of the electromagnetic triggering mechanism is a cylindrical structure, and its central axis coincides with the central axis of the linkage rod of the double-break circuit breaker, and they are coaxially aligned. The direction of the axis is parallel to the direction of movement of the moving contact of the double-break circuit breaker.

[0008] As a preferred embodiment of the present invention, the overload detection chip forms a star-shaped electrical connection structure with the delay protection module, the power module, and the built-in potentiometer through the copper foil lines preset on the main control circuit board. The adjustment end of the built-in potentiometer is exposed through the long strip-shaped opening reserved on the side of the device housing, and its signal pin is directly connected to the signal input end of the overload detection chip through a short-distance wire.

[0009] As a preferred embodiment of the present invention, the input end of the double-break circuit breaker is electrically connected to the output end of the incoming terminal via a conductive copper busbar, and the output end is electrically connected to the input end of the outgoing terminal via a conductive copper busbar. The moving contact has symmetrical silver alloy breaks at both ends. The linkage rod is vertically fixed to the upper surface of the middle part of the moving contact, and the top end face of the linkage rod is parallel to and directly opposite the lower end face of the trigger end.

[0010] As a preferred embodiment of the present invention, the status indicator is a red-green dual-color light-emitting diode. The pin of the status indicator passes through the status indicator hole in the horizontal direction and is soldered and fixed to the pad near the front edge on the main control circuit board. The end face of the status indicator is flush with the outer surface of the front panel of the device housing. The manual reset button is a self-resetting push button switch. The terminal of the manual reset button is electrically connected to the reset control circuit of the double-break circuit breaker through two wires.

[0011] As a preferred embodiment of the present invention, the reset spring is a cylindrical compression spring, and the elastic coefficient of the reset spring is adapted to the electromagnetic triggering thrust of the electromagnetic triggering mechanism.

[0012] As a preferred embodiment of the present invention, the built-in potentiometer is fixed to the upper surface of the main control circuit board by surface mount technology and is arranged parallel to one side of the overload detection chip.

[0013] As a preferred embodiment of the present invention, the delay protection module and the power supply module are located diagonally above the left and right sides of the overload detection chip, respectively, and thermally conductive silicone heat dissipation pads are provided on the bonding and fixing surfaces of the delay protection module and the power supply module with the main control circuit board.

[0014] Compared with the prior art, the beneficial effects of the present invention are: After being powered by the power module, the overload detection chip collects the line current signal in real time through the copper foil circuit of the main control circuit board. The built-in potentiometer presets the overload threshold. When the current exceeds the threshold, the chip instantly sends a trigger signal to the electromagnetic trigger mechanism. Its cylindrical trigger end precisely pushes the linkage rod of the double-break circuit breaker along the coaxial direction, driving the circuit breaker to quickly trip. The overload response is delayed, and the double-break synchronously cuts off the main circuit, completely extinguishing the arc. This solves the problems of slow response and incomplete disconnection of traditional devices, and avoids line overheating, short circuit and fire. The incoming and outgoing terminal covers isolate the terminals from the external environment through insulating linings. The time-delay protection module filters instantaneous current fluctuations. The electromagnetic triggering mechanism and linkage rod are coaxially aligned to ensure triggering without deviation. The heat dissipation pads of the time-delay protection module and power module quickly conduct heat to avoid overheating attenuation, prevent leakage and oxidation of the terminals, prevent false triggering and equipment overheating damage, improve the triggering success rate, enhance the insulation safety and long-term operational stability of the device, and adapt to complex low-voltage power distribution network environments.

[0015] With its built-in potentiometer adjustment terminal exposed, the overload threshold can be adjusted without disassembling the device. The terminal cover is removable for easy wiring and maintenance. The dual-color status indicator light provides intuitive feedback on the operating and overload status. The manual reset button achieves precise reset via a reset spring, simplifying the threshold adjustment and maintenance process, reducing operational difficulty, and allowing users to quickly determine the equipment status and handle faults. It is suitable for the renovation and new installation needs of various low-voltage power distribution network scenarios in residential communities and industrial plants. Attached Figure Description

[0016] Figure 1 This is a top view of the internal structure of the present invention; Figure 2 This is a diagram showing the front structure of the present invention; Figure 3 This is a diagram illustrating the overall internal structure of the present invention; Figure 4 This is a structural diagram on the right side of the present invention; Figure 5 This is a structural diagram of the left side of the present invention; Figure 6 This is a front perspective view of the present invention.

[0017] In the diagram: 1. Device housing; 2. Main control circuit board; 3. Overload detection chip; 4. Built-in potentiometer; 5. Time delay protection module; 6. Power module; 7. Incoming wire terminal hole; 8. Outgoing wire terminal hole; 9. Incoming wire terminal cover; 10. Incoming wire terminal; 11. Outgoing wire terminal cover; 12. Outgoing wire terminal; 13. Double-break circuit breaker; 14. Linkage rod; 15. Electromagnetic triggering mechanism; 16. Trigger end; 17. Status indicator light hole; 18. Manual reset button hole; 19. Status indicator light; 20. Manual reset button; 21. Reset spring. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-6This invention provides a low-voltage power distribution network overload rapid disconnection device, including a device housing 1. An inlet terminal hole 7 is provided on the left front end of the device housing 1, and an outlet terminal hole 8 is provided on the right front end. A status indicator light hole 17 and a manual reset button hole 18 are respectively provided on the front panel of the device housing 1. A main control circuit board 2 is embedded in the central area inside the device housing 1. An overload detection chip 3 is mounted on the central area of ​​the upper surface of the main control circuit board 2. The sides of the overload detection chip 3 are arranged adjacently and electrically connected to built-in potentiometers 4. A delay protection module 5 and a power supply module are symmetrically arranged diagonally above and below the two sides of the overload detection chip 3. 6. The copper foil lines on the main control circuit board 2 form a bidirectional electrical connection with the overload detection chip 3. The incoming terminal 10 in the incoming terminal hole 7 is covered by the incoming terminal cover 9, which is fixed to the inner side of the left end of the device housing 1 corresponding to the incoming terminal hole 7. The outgoing terminal 12 in the outgoing terminal hole 8 is covered by the outgoing terminal cover 11, which is fixed to the inner side of the right end of the device housing 1 corresponding to the outgoing terminal hole 8. A double-break circuit breaker 13 is installed in the center of the bottom inside the device housing 1. A linkage rod 14 is vertically protruding from the top of the double-break circuit breaker 13. The lower surface of the main control circuit board 2 is vertically fixed to... An electromagnetic triggering mechanism 15 is provided. The trigger end 16 at the lower end of the electromagnetic triggering mechanism 15 is vertically aligned with the linkage rod 14. A status indicator light 19 is interference-fitted into a status indicator light hole 17. A manual reset button 20 is snapped into a manual reset button hole 18. A reset spring 21 is embedded inside the manual reset button 20 and electrically connected to the overload detection chip 3. Both the status indicator light hole 17 and the manual reset button hole 18 are electrically connected to the overload detection chip 3 via wires. A double-break circuit breaker 13 is connected in series between the incoming terminal 10 and the outgoing terminal 12. Specifically, the entire device is powered by a power module 6, and the overload detection chip 3 is connected via... The main control circuit board 2 uses copper foil lines to collect the line current signal between the incoming terminal 10 and the outgoing terminal 12 in real time. A built-in potentiometer 4 presets an overload threshold. When the current exceeds the threshold, the overload detection chip 3 quickly sends a trigger signal to the electromagnetic trigger mechanism 15. Its trigger end 16 pushes the linkage rod 14 of the double-break circuit breaker 13 vertically, causing the circuit breaker to quickly trip and disconnect the main circuit. The status indicator 19 synchronously reflects the overload tripping status. After the fault is cleared, the reset spring 21 is triggered by the manual reset button 20, causing the circuit breaker to close and restore power supply. The delay protection module 5 avoids false triggering caused by instantaneous current fluctuations. This creates a complete closed loop of detection-trigger-tripping-indication-reset. The structure is compact and precisely aligned, achieving overload response delay and solving the problems of slow response, loose structure, and single function in traditional devices, while balancing rapid protection and ease of operation.

[0020] Both the inlet terminal cover 9 and the outlet terminal cover 11 are detachable semi-enclosed shell structures with an insulating liner attached to their inner walls. Specifically, the inlet terminal cover 9 and the outlet terminal cover 11 are designed to detachably cover the wiring terminals, and the insulating liner on the inner wall isolates the live wiring terminals from the external environment, preventing dust and moisture from directly contacting the terminal joints. During maintenance, the terminal cover can be directly removed without disassembling the entire device.

[0021] The trigger end 16 of the electromagnetic trigger mechanism 15 is a cylindrical structure. Its central axis coincides with the central axis of the linkage rod 14 of the double-break circuit breaker 13, and they are coaxially opposite each other. The direction of the axis is parallel to the direction of movement of the moving contact of the double-break circuit breaker 13. Specifically, after the electromagnetic trigger mechanism 15 is energized, the cylindrical trigger end 16 extends along its own axis. Because it is coaxially opposite to the linkage rod 14 and the axis is parallel to the direction of movement of the circuit breaker's moving contact, the trigger end 16 can act precisely and without deviation on the linkage rod 14, pushing the moving contact to quickly open the circuit breaker.

[0022] The overload detection chip 3 forms a star electrical connection structure with the delay protection module 5, the power module 6, and the built-in potentiometer 4 through the copper foil lines preset on the main control circuit board 2. The adjustment terminal of the built-in potentiometer 4 is exposed through the long strip-shaped opening reserved on the side of the device housing 1, and its signal pin is directly connected to the signal input terminal of the overload detection chip 3 through a short-distance wire. Specifically, the star electrical connection structure minimizes the signal transmission path between the overload detection chip 3 and the delay protection module 5, the power module 6, and the built-in potentiometer 4, and the copper foil lines reduce signal loss. The adjustment terminal of the built-in potentiometer 4 is exposed, and the threshold can be directly adjusted through the external opening without disassembling the device.

[0023] The input terminal of the double-break circuit breaker 13 is electrically connected to the output terminal of the incoming terminal 10 via a conductive copper busbar, and the output terminal is electrically connected to the input terminal of the outgoing terminal 12 via a conductive copper busbar. The moving contact has symmetrical silver alloy breaks at both ends. The linkage rod 14 is vertically fixed to the upper surface of the middle of the moving contact, with the top end face of the linkage rod 14 parallel to and directly opposite the lower end face of the trigger terminal 16. Specifically, the conductive copper busbar has low resistance and high conductivity, ensuring stable current transmission between the incoming terminal 10 and the outgoing terminal 12. The double silver alloy breaks of the double-break circuit breaker 13 trip synchronously, quickly extinguishing the arc and preventing arc residue.

[0024] The status indicator light 19 is a red-green bicolor LED. The pins of the status indicator light 19 pass horizontally through the status indicator light hole 17 and are soldered to the pads near the front edge of the main control circuit board 2. The end face of the status indicator light 19 is flush with the outer surface of the front panel of the device housing 1. The manual reset button 20 is a self-resetting push button switch. The terminals of the manual reset button 20 are electrically connected to the reset control circuit of the double-break circuit breaker 13 through two wires. Specifically, the status indicator light 19 adopts a bicolor design: green light indicates normal operation, and red light indicates overload cutoff. The lamp body is flush with the panel to avoid collision damage. When the manual reset button 20 is pressed, it triggers the circuit breaker reset circuit through the wires. After being released, it self-resets, ensuring accurate reset action.

[0025] The reset spring 21 is a cylindrical compression spring, and the elastic coefficient of the reset spring 21 is adapted to the electromagnetic triggering thrust of the electromagnetic triggering mechanism 15. Specifically, the elastic coefficient of the cylindrical compression spring matches the triggering thrust of the electromagnetic triggering mechanism 15, so that the trigger end 16 and the linkage rod 14 maintain a reasonable gap in the natural state to avoid accidental triggering. After triggering, the elastic restoring force of the spring drives the trigger end 16 to quickly reset, preparing for the next triggering.

[0026] The built-in potentiometer 4 is fixed to the upper surface of the main control circuit board 2 by surface mount technology and is set parallel to one side of the overload detection chip 3. Specifically, the surface mount technology makes the built-in potentiometer 4 fit tightly to the main control circuit board 2 and is set parallel to the overload detection chip 3, which shortens the signal transmission distance between the two and reduces signal attenuation.

[0027] The delay protection module 5 and the power module 6 are located diagonally above the left and right sides of the overload detection chip 3, respectively. Both the delay protection module 5 and the power module 6 have thermally conductive silicone heat dissipation pads on their bonding surfaces with the main control circuit board 2. Specifically, the heat generated by the delay protection module 5 and the power module 6 during operation is quickly conducted to the main control circuit board 2 through the thermally conductive silicone heat dissipation pads, and then dissipated through the circuit board. The isolation groove prevents heat from being conducted between the two modules, thus preventing local overheating.

[0028] In this invention, the power supply module 6 supplies power to the entire device. The overload detection chip 3 collects the line current signal between the incoming terminal 10 and the outgoing terminal 12 in real time through the copper foil circuit of the main control circuit board 2. The built-in potentiometer 4 presets the overload threshold. When the current exceeds the threshold, the overload detection chip 3 quickly sends a trigger signal to the electromagnetic trigger mechanism 15. Its trigger end 16 pushes the linkage rod 14 of the double-break circuit breaker 13 in the vertical direction, causing the circuit breaker to quickly trip and disconnect the main circuit. The status indicator light 19 synchronously reflects the overload disconnection status. After the fault is cleared, the reset spring 21 is triggered by the manual reset button 20, causing the circuit breaker to close and restore power supply. The delay protection module 5 can avoid false triggering caused by instantaneous current fluctuations. This makes it possible to construct a complete closed loop of detection-trigger-disconnection-indication-reset. The layout of each structure is compact and the alignment is precise, realizing overload response delay and solving the problems of slow response, loose structure and single function of traditional devices, while taking into account both rapid protection and convenient operation.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-voltage power distribution network overload rapid disconnection device, comprising a device housing (1), characterized in that: The device housing (1) has an inlet terminal hole (7) on the left front end and an outlet terminal hole (8) on the right front end. The front panel of the device housing (1) has a status indicator hole (17) and a manual reset button hole (18) respectively. A main control circuit board (2) is embedded in the central area inside the device housing (1). An overload detection chip (3) is mounted on the center of the upper surface of the main control circuit board (2). The overload detection chip (3) is arranged adjacent to each other on its sides and electrically connected to a built-in potentiometer (4). The overload detection chip (3) is symmetrically arranged with a delay protection module (5) and a power supply module (6) on its two sides above the overload detection chip (3). The copper foil lines on the main control circuit board (2) form a bidirectional electrical connection with the overload detection chip (3). The inlet terminal (10) in the inlet terminal hole (7) is covered by an inlet terminal cover (9). The inlet terminal cover (9) is fixed to the inner side of the left end of the device housing (1) corresponding to the inlet terminal hole (7). The outlet terminal (12) in the outlet terminal hole (8) is connected to the inlet terminal hole (8) through the inlet terminal hole (8). A terminal cover (11) is installed, and the terminal cover (11) is fixed to the inner side of the right end of the device housing (1) corresponding to the terminal hole (8). A double-break circuit breaker (13) is installed in the center of the bottom of the device housing (1). A linkage rod (14) is vertically protruding from the top of the double-break circuit breaker (13). An electromagnetic trigger mechanism (15) is vertically fixed to the lower surface of the main control circuit board (2). The trigger end (16) at the lower end of the electromagnetic trigger mechanism (15) is directly opposite the linkage rod (14) in the vertical direction. The status indicator hole (17) is interference-fitted with a status indicator (19), and the manual reset button hole (18) is snapped with a manual reset button (20). The manual reset button (20) is internally fitted with a reset spring (21) and electrically connected to the overload detection chip (3). The status indicator hole (17) and the manual reset button hole (18) are both electrically connected to the overload detection chip (3) through wires. The double-break circuit breaker (13) is connected in series between the incoming terminal (10) and the outgoing terminal (12).

2. The low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: Both the inlet terminal cover (9) and the outlet terminal cover (11) are detachable semi-enclosed shell structures with an insulating liner attached to their inner walls.

3. The low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The trigger end (16) of the electromagnetic triggering mechanism (15) is a cylindrical structure. Its central axis coincides with the central axis of the linkage rod (14) of the double-break circuit breaker (13), and they are coaxially opposite each other. The direction of the axis is parallel to the direction of movement of the moving contact of the double-break circuit breaker (13).

4. The low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The overload detection chip (3) forms a star electrical connection structure with the delay protection module (5), the power module (6), and the built-in potentiometer (4) respectively through the copper foil line preset on the main control circuit board (2). The adjustment end of the built-in potentiometer (4) is exposed through the long strip-shaped opening reserved on the side of the device housing (1), and its signal pin is directly connected to the signal input end of the overload detection chip (3) through a short-distance wire.

5. A low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The input end of the double-break circuit breaker (13) is electrically connected to the output end of the incoming terminal (10) through a conductive copper busbar, and the output end is electrically connected to the input end of the outgoing terminal (12) through a conductive copper busbar. The left and right ends of its moving contact are symmetrically provided with silver alloy break points. The linkage rod (14) is vertically fixed to the upper surface of the middle part of the moving contact. The top end face of the linkage rod (14) and the lower end face of the trigger end (16) are parallel and directly opposite each other.

6. A low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The status indicator (19) is a red and green dual-color light-emitting diode. The pin of the status indicator (19) passes through the status indicator hole (17) in the horizontal direction and is soldered and fixed to the pad near the front edge on the main control circuit board (2). The lamp body end face of the status indicator (19) is flush with the outer surface of the front panel of the device housing (1). The manual reset button (20) is a self-resetting push button switch. The terminal of the manual reset button (20) is electrically connected to the reset control circuit of the double-break circuit breaker (13) through two wires.

7. A low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The reset spring (21) is a cylindrical compression spring, and the elastic coefficient of the reset spring (21) is adapted to the electromagnetic triggering thrust of the electromagnetic triggering mechanism (15).

8. A low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The built-in potentiometer (4) is fixed to the upper surface of the main control circuit board (2) by surface mount technology and is set parallel to one side of the overload detection chip (3).

9. A low-voltage distribution network overload rapid disconnection device according to claim 1, characterized in that: The delay protection module (5) and the power module (6) are located diagonally above the left and right sides of the overload detection chip (3), respectively. The delay protection module (5) and the power module (6) are respectively provided with thermally conductive silicone heat dissipation pads on the bonding and fixing surfaces of the main control circuit board (2).

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