An electromagnetic circuit breaker leakage tripping mechanism

Abstract

The application discloses an electromagnetic circuit breaker electric leakage tripping mechanism, comprising an N-pole tripper, a poking piece, an auxiliary locking piece and a main locking piece. The N-pole tripper comprises an extension rod; the poking piece is rotationally arranged on a bottom shell and comprises a rotation sleeve setting part, a pressure receiving part and a pressure receiving part; the auxiliary locking piece is rotationally sleeved on a connecting shaft of a contact support and comprises a contact receiving part, a limiting part and a mounting part, the limiting part is provided with a limiting groove; the main locking piece is rotationally sleeved on a center sleeve setting part of the contact support and is provided with an abutting part which abuts in the limiting groove. When the extension rod of the N-pole tripper extends, the pressure receiving part of the poking piece is pushed to drive the poking piece to rotate, the pressure receiving part abuts against the contact receiving part to drive the limiting part of the auxiliary locking piece to rotate away from the main locking piece, so that the abutting part is separated from the limiting groove, and electric leakage tripping is completed. The transmission chain of the application is short, transmission is reliable, the structure is compact, and the sensitivity and stability of electric leakage tripping are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of circuit breaker leakage protection mechanisms, specifically relating to an electromagnetic circuit breaker leakage tripping mechanism. Background Technology

[0002] In the safe operation system of low-voltage power distribution systems, leakage current protection is a core protective element, distinct from overload protection and short-circuit protection, and a key technical means to avoid personal safety accidents and electrical fires at low-voltage terminals. With the widespread adoption of building electrification, industrial automation, and intelligent electrical equipment in residential applications, the complexity of power distribution lines and the types of electrical equipment loads are continuously increasing. Safety hazards such as aging insulation, incorrect wiring, equipment leakage, and accidental contact with circuits are becoming increasingly frequent, placing higher demands on the detection sensitivity, operational reliability, environmental adaptability, and operational stability of low-voltage leakage current protection devices. Electromagnetic leakage current circuit breakers, as a core safety protection device mandated for low-voltage power distribution terminals, are fundamentally different from electronic leakage current circuit breakers. They rely on a purely electromagnetic structure to achieve residual current detection and tripping actuation, eliminating the need for electronic circuit boards, chip components, and external power supplies. This completely avoids the technical shortcomings of electronic products, such as susceptibility to high and low temperature environments, strong electromagnetic interference, voltage fluctuations, and low-voltage failure. Therefore, electromagnetic residual current circuit breakers, with their strong environmental adaptability, anti-interference performance and operational stability, are widely used in various high-risk and complex electrical environments such as residential building power distribution, industrial and commercial workshop power distribution, and humid working conditions.

[0003] Currently, the conventional electromagnetic circuit breaker leakage current tripping mechanism on the market has a fixed structural design, and its overall structure is outdated. In actual mass production and long-term use under complex operating conditions, many unavoidable technical defects have gradually been exposed. First, the magnetic circuit induction structure design of traditional leakage current tripping mechanisms is unreasonable, resulting in poor magnetic field aggregation and severe magnetic flux loss. It lacks sufficient sensitivity to detect the weak milliampere residual leakage current generated by electric shock, and the magnetic field conversion utilization rate is low. This easily leads to problems such as failure to detect critical leakage current conditions, delayed tripping action, or even failure to trip, failing to achieve precise leakage current protection and posing serious electrical safety hazards. Second, the N-pole trip unit and locking element of traditional leakage current tripping mechanisms typically use direct drive or complex linkage transmission. This results in a long transmission chain, numerous parts, cumbersome assembly processes, and a lack of reliable limiting and guiding structures between the various transmission components. After long-term operation, wear, jamming, or transmission misalignment easily occur, leading to poor stability of the tripping action. Secondly, the traditional residual current circuit breaker (RCCB) tripping mechanism lacks a reliable reset structure for the actuating element and extension rod after tripping, preventing the RCCB from repeating its operation and affecting the circuit breaker's service life and operational reliability. Furthermore, the locking coordination between the auxiliary and main locking elements in the traditional RCCB tripping mechanism is unreliable. During RCCB tripping, the auxiliary locking element struggles to accurately release its limit on the main locking element, resulting in an unclear tripping transmission chain and a tendency for locking failure or unreliable disconnection. Finally, the traditional RCCB tripping mechanism is prone to interference with short-circuit and overload tripping mechanisms, exhibiting poor synchronization and hindering the implementation of multi-functional zone protection. Moreover, its loose overall structure and large footprint fail to meet the modern trends of smaller size, multi-functionality, high sensitivity, high stability, long lifespan, and easy assembly in power distribution equipment, as well as the demands for miniaturized, modular, and densely wired terminal power distribution installations.

[0004] In summary, existing electromagnetic circuit breaker leakage current tripping mechanisms generally suffer from low magnetic field utilization, poor accuracy in detecting weak leakage current, weak mechanical transmission stability, unreliable tripping action, imperfect reset structure, and interference with short-circuit and overload tripping mechanisms. These issues make it difficult to meet the current high standards and production requirements of the low-voltage power distribution industry for leakage current circuit breakers, including high-sensitivity detection, high-precision tripping, high-stability operation, low maintenance costs, and long service life. Therefore, to address the multiple technical pain points in existing technologies, it is necessary to design an electromagnetic circuit breaker leakage current tripping mechanism with optimized structural layout, low magnetic circuit loss, high sensitivity to weak leakage current, stable and accurate tripping action, strong versatility, easy rapid assembly, and small size. This would overcome the shortcomings of existing technologies and adapt to the high-end application requirements of current low-voltage power distribution safety protection. Summary of the Invention

[0005] The purpose of this invention is to provide an electromagnetic circuit breaker leakage tripping mechanism to solve the technical problems in the prior art, such as low magnetic field utilization, poor accuracy of weak leakage induction, weak mechanical transmission stability, unreliable tripping action, imperfect reset structure, and mutual interference with short-circuit tripping mechanism and overload tripping mechanism.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An electromagnetic circuit breaker leakage current tripping mechanism includes: a contact bracket rotatably mounted on the bottom shell of the circuit breaker; an N-pole tripping device including an extension rod; a toggle member rotatably mounted on the bottom shell of the circuit breaker, the toggle member including a rotating sleeve portion, a pressure receiving portion located on one side of the rotating sleeve portion, and a pressing portion located on the other side of the rotating sleeve portion, the pressure receiving portion corresponding to the extension rod; and an auxiliary locking member rotatably mounted on the connecting shaft of the contact bracket, the auxiliary locking member including a pressing portion located at a lower position, a limiting portion located at an upper position, and a limiting portion located at a right side position. The mounting part has a corresponding pressing part and a contact part, and a limiting part has a limiting groove. The main locking part is rotatably sleeved on the central sleeve part of the contact bracket. The main locking part has a contact part that abuts against the limiting groove at the position corresponding to the limiting part, so as to realize the locking cooperation between the main locking part and the auxiliary locking part. When the extension rod of the N-pole trip unit extends, it pushes the pressing part of the actuating part to drive the actuating part to rotate, so that the pressing part abuts against the contact part and drives the limiting part of the auxiliary locking part to rotate away from the main locking part, so that the contact part disengages from the limiting groove and completes the leakage trip.

[0007] By adopting the above technical solution, the N-pole trip unit drives the extension rod to extend when a leakage fault occurs. The extension rod pushes the pressure part of the actuating component, causing the actuating component to rotate around the rotating sleeve part. The pressing part of the actuating component pushes the contact part of the auxiliary locking component, causing the auxiliary locking component to rotate. The limiting part of the auxiliary locking component moves away from the main locking component, and the contact part of the main locking component disengages from the limiting groove, completing the leakage trip. This structure converts the linear extension motion of the N-pole trip unit into the rotation of the actuating component, which then drives the rotation of the auxiliary locking component. The transmission chain is short and reliable, reducing the number of parts and improving space utilization. It solves the problems of unreasonable magnetic circuit induction structure, long transmission chain, and poor stability of tripping action in traditional leakage trip mechanisms.

[0008] Preferably, the mounting portion of the auxiliary locking member is provided with a mounting protrusion, the main locking member is provided with a positioning groove corresponding to the position of the mounting protrusion, and a reset elastic member is provided between the mounting protrusion and the positioning groove. The reset elastic member is used to rotate and reset the auxiliary locking member.

[0009] By adopting the above technical solution, the reset elastic element is located between the mounting protrusion on the auxiliary locking element's mounting part and the positioning groove on the main locking element. After the leakage current trips, the reset elastic element can rotate and reset the auxiliary locking element, causing the limiting groove of the auxiliary locking element to re-engage with the abutment part of the main locking element, ensuring the reliability of the next locking action, improving the stability of the repeated actions of the leakage current tripping mechanism, and solving the problem of the imperfect reset structure of the traditional leakage current tripping mechanism.

[0010] Preferably, the contact support includes a contact support cover, a contact support body, and a contact support base; the contact support cover is fastened to the contact support body, and the contact support base is fastened to the contact support body; the contact support body is provided with a central sleeve portion, and a rotating shaft passes through the central sleeve portion, and the contact support body is rotatably connected to the bottom shell through the rotating shaft.

[0011] By adopting the above technical solution, the contact bracket is composed of a contact bracket cover, a contact bracket body, and a contact bracket base, which are fastened together. This design facilitates easy assembly, has a compact structure, and allows for rapid assembly. The contact bracket body is rotatably connected to the base shell via a central sleeve and a rotating shaft, ensuring stable and reliable rotation. Both the auxiliary locking component and the main locking component are located on the contact bracket, integrating the locking mechanism with the contact bracket into a single unit. This reduces the overall size of the leakage current tripping mechanism, improves space utilization, and solves the problems of loose structure and large space occupation associated with traditional leakage current tripping mechanisms.

[0012] Preferably, the pressure-bearing part of the actuating member is provided with an abutting protrusion; a torsional elastic member is provided between the contact frame body and the contact frame base, one end of the torsional elastic member abuts against the contact frame body or the contact frame base, and the other end extends out of the contact support and abuts against the abutting protrusion. After the contact support is disconnected and reset, the torsional elastic member drives the abutting protrusion and the actuating member to rotate, thereby realizing the reset of the actuating member and the extension rod.

[0013] By adopting the above technical solution, a torsional elastic element is disposed between the contact frame body and the contact frame base, with its other end extending out of the contact support and abutting against the abutting protrusion on the pressure-bearing part. After the contact support is disconnected and reset, the torsional elastic element can drive the abutting protrusion and the actuating element to rotate, thereby resetting the actuating element and the extension rod, ensuring that the N-pole tripping mechanism can repeat its operation. This reset structure makes full use of the internal space of the contact support, has a compact structure, and provides reliable reset, solving the problem of unstable reset of the actuating element and extension rod in traditional leakage current tripping mechanisms.

[0014] Preferably, the main locking member is provided with a sleeve hole, and the main locking member is sleeved on the central sleeve part of the contact frame body through the sleeve hole.

[0015] By adopting the above technical solution, the main locking component is sleeved on the central sleeve part of the contact frame body through the sleeve hole. The installation structure is simple, the rotation is stable and reliable, and the main locking component is arranged coaxially with the contact frame body, which helps to reduce the space occupied by the locking mechanism and improve space utilization.

[0016] Preferably, a recessed groove is provided above the main body of the contact holder, the recessed groove having a downwardly extending vertical section and a horizontal section located on the right side above the vertical section; an operating component is rotatably provided on the bottom shell, and also includes an operating linkage, one end of the operating linkage being inserted into the operating component and the other end being inserted into the recessed groove; an abutting protrusion adapted to the recessed groove is provided on one side of the contact holder main body located in the recessed groove.

[0017] By adopting the above technical solution, one end of the operating linkage is inserted into the operating component, and the other end is inserted into the recessed groove of the contact holder body, realizing reliable linkage between the operating component and the contact holder. The vertical and horizontal sections of the recessed groove provide movement space for the operating linkage, and the abutment protrusion limits and guides the operating linkage, ensuring that when leakage current trips, the contact holder can drive the operating component to rotate to the disconnected position through the operating linkage, thus solving the problem of unreliable linkage between the operating component and the contact holder.

[0018] Preferably, the main locking member has an arc-shaped segment at the position corresponding to the abutting protrusion that matches the shape of the recessed groove, and the other end of the operating linkage is located between the abutting protrusion and the arc-shaped segment; the main locking member has a blocking protrusion at the top position of the arc-shaped segment, and the blocking protrusion is used to restrict the operating linkage from disengaging from the recessed groove.

[0019] By adopting the above technical solution, the other end of the operating linkage is located between the abutting protrusion and the arc-shaped section of the main locking component. The arc-shaped section matches the shape of the recessed groove, which can provide good guidance and limitation for the operating linkage. The blocking protrusion at the top of the arc-shaped section of the main locking component can prevent the operating linkage from disengaging from the recessed groove, prevent transmission failure, improve the reliability of the linkage between the operating component and the contact support, and solve the problem of weak mechanical transmission stability in traditional leakage tripping mechanisms.

[0020] Preferably, when the leakage current trips, the auxiliary locking component rotates to disengage the abutment part of the main locking component from the limit groove. After the main locking component is released from the limit, it rotates in the opening direction, and the contact bracket rotates in the opening direction simultaneously. The contact bracket drives the moving contact away from the stationary contact through the contact connecting rod, and at the same time, the contact bracket drives the operating component to rotate to the disconnect position through the operating connecting rod.

[0021] By adopting the above technical solution, when the leakage current trips, after the auxiliary locking component rotates to release its limit on the main locking component, the main locking component, after being released from its limit, rotates in the opening direction. Simultaneously, the contact bracket rotates in the opening direction. The contact bracket, through the contact connecting rod, drives the moving contact away from the stationary contact, and at the same time, through the operating connecting rod, drives the operating component to rotate to the disconnect position. This opening transmission chain is clear and reliable, enabling rapid disconnection in case of leakage current faults, ensuring the accuracy and reliability of the leakage current protection action, and solving the problems of unreliable tripping action and unclear opening transmission chain in traditional leakage current tripping mechanisms.

[0022] Preferably, the auxiliary locking element is rotatably sleeved on the connecting shaft, and the connecting shaft is connected between the first insertion hole on the contact frame body and the second insertion hole on the contact frame cover.

[0023] By adopting the above technical solution, the auxiliary locking component is stably installed between the contact frame body and the contact frame cover via a connecting shaft. The two ends of the connecting shaft are positioned by the first and second insertion holes respectively, ensuring reliable installation. The abutment portion below the auxiliary locking component receives the drive of the actuating component, the limiting groove on the upper limiting portion cooperates with the main locking component to achieve locking, and the mounting protrusion on the right mounting portion is used to install the reset elastic component. The rational layout of each functional part helps to reduce the overall size and improve transmission efficiency.

[0024] Preferably, the N-pole trip unit is a residual current electromagnetic trip unit, used to detect residual current in the circuit and drive the extension rod to extend.

[0025] By adopting the above technical solution, the N-pole trip unit uses a residual current electromagnetic trip unit, which can detect the residual current in the circuit and drive the extension rod to extend, thereby realizing the leakage current protection function. This N-pole trip unit adopts a pure electromagnetic structure, possessing strong environmental adaptability, anti-interference performance, and operational stability. The N-pole trip unit has a compact structure and sensitive response, and can cooperate with the toggle element, auxiliary locking element, and main locking element to achieve rapid tripping and disconnection in the event of a leakage current fault, improving the sensitivity and reliability of leakage current protection.

[0026] Compared with the prior art, the present invention has, but is not limited to, the following beneficial effects: 1. The extension rod of the N-pole trip unit drives the actuating element, which in turn drives the auxiliary locking element to rotate. The auxiliary locking element releases its limit on the main locking element, completing the leakage current trip. This structure converts the linear extension motion of the N-pole trip unit into the rotation of the actuating element, which then drives the auxiliary locking element to rotate. The transmission chain is short and reliable, reducing the number of parts and improving space utilization. It solves the problems of unreasonable magnetic circuit induction structure, long transmission chain, and poor tripping stability of traditional leakage current tripping mechanisms.

[0027] 2. The auxiliary locking component and the main locking component are locked together by the limiting groove and the limiting cooperation of the abutment part. When the leakage current trips, the rotation of the auxiliary locking component can release the limiting of the main locking component. The main locking component and the contact bracket rotate synchronously in the direction of opening. The contact bracket drives the moving contact away from the stationary contact through the contact connecting rod. At the same time, it drives the operating component to rotate to the disconnect position through the operating connecting rod. The reset elastic component and the torsional elastic component cooperate with each other to reliably reset the auxiliary locking component, the toggle component and the extension rod, ensuring that the leakage current tripping mechanism can repeat the action. This solves the problems of unreliable tripping action and imperfect reset structure of traditional leakage current tripping mechanisms.

[0028] 3. The N-pole trip unit adopts a residual current electromagnetic trip unit, which does not rely on electronic circuit boards, chip components and external power supply. It completely avoids the technical shortcomings of electronic products that are susceptible to high and low temperature environments, strong electromagnetic interference, voltage fluctuations and low voltage failure. It has extremely strong environmental adaptability, anti-interference performance and working stability. Moreover, the leakage current tripping mechanism is independent of the short-circuit instantaneous protection structure and overload time delay protection structure of the circuit breaker and does not interfere with each other, realizing multi-functional zone protection. It is conducive to the high integration, structural simplification and miniaturization of electromagnetic leakage current circuit breakers. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention in the open state according to a specific embodiment; Figure 2 This is a schematic diagram of the structure of a specific embodiment of the present invention in the closed state; Figure 3 This is a schematic diagram illustrating the structure of the bottom shell in a specific embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the structure of the contact support according to a specific embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the connection structure of the contactor frame cover, the contactor frame body, and the contactor frame base in a specific embodiment of the present invention. Figure 1 ; Figure 6 This is a schematic diagram illustrating the connection structure of the contactor frame cover, the contactor frame body, and the contactor frame base in a specific embodiment of the present invention. Figure 2 ; Figure 7 This is a schematic diagram illustrating the structure of the contact frame cover according to a specific embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the structure of the contactor frame body according to a specific embodiment of the present invention; Figure 9 This is a schematic diagram illustrating the structure of the contactor frame base according to a specific embodiment of the present invention; Figure 10 This is a schematic diagram illustrating the structure of a torsional elastic element according to a specific embodiment of the present invention; Figure 11 This is a schematic diagram illustrating the structure of the auxiliary locking component according to a specific embodiment of the present invention; Figure 12 This is a schematic diagram illustrating the structure of the main locking component in a specific embodiment of the present invention; Figure 13 This is a schematic diagram illustrating the structure of the operating element, contact support, and moving contact in the open position according to a specific embodiment of the present invention; Figure 14 This is a schematic diagram illustrating the structure of the operating element, contact support, and moving contact in the closed position according to a specific embodiment of the present invention; Figure 15This is a schematic diagram illustrating the structure of the auxiliary locking member after rotation and the cancellation of the limiting effect on the main locking member in a specific embodiment of the present invention; Figure 16 This is a schematic diagram illustrating the cooperative structure between the N-pole trip unit and the actuating element in a specific embodiment of the present invention; Figure 17 This is a schematic diagram illustrating the structure of the actuating component in a specific embodiment of the present invention.

[0030] In the diagram: 101, bottom shell; 110, operating component; 111, operating linkage; 200, contact bracket; 201, contact bracket cover; 202, contact bracket body; 203, contact bracket base; 204, central sleeve part; 205, rotating shaft; 207, recessed groove; 208, vertical section; 209, horizontal section; 210, abutting protrusion; 211, first insertion hole; 212, second insertion hole; 213, torsional elastic element; 300, moving contact; 301, contact linkage; 307, stationary contact; 40 1. Main locking component; 402. Auxiliary locking component; 403. Arc-shaped segment; 404. Blocking protrusion; 405. Connecting shaft; 406. Contact part; 407. Limiting part; 408. Mounting part; 409. Mounting protrusion; 410. Limiting groove; 411. Abutting part; 412. Positioning groove; 413. Reset elastic component; 501. N-pole trip unit; 502. Actuating component; 503. Extending rod; 504. Rotating sleeve part; 505. Pressing part; 506. Pressing part; 507. Abutting protrusion. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] The following is combined Figure 1-17 The technical solution of the present invention will be described in further detail below.

[0033] This embodiment provides a leakage current tripping mechanism for an electromagnetic circuit breaker, comprising a contact support 200, a neutral (N) trip unit 501, a toggle member 502, an auxiliary locking member 402, and a main locking member 401. The contact support 200 is rotatably mounted on the bottom housing 101 of the circuit breaker. The N trip unit 501 includes an extension rod 503. The toggle member 502 is rotatably mounted on the bottom housing 101 of the circuit breaker. The auxiliary locking member 402 is rotatably sleeved on the connecting shaft 405 of the contact support 200. The main locking member 401 is rotatably sleeved on the central sleeve portion 204 of the contact support 200.

[0034] N-pole trip unit 501 The N-pole trip unit 501 is a residual current electromagnetic trip unit used to detect residual current in the circuit and drive the extension rod 503 to extend. When residual current is generated in the circuit, the extension rod 503 of the N-pole trip unit 501 extends, pushing the pressure part 505 of the actuating member 502.

[0035] Toggle 502 The actuating member 502 is rotatably mounted on the bottom shell 101 of the circuit breaker. The actuating member 502 includes a rotating sleeve portion 504, a pressure receiving portion 505 located on one side of the rotating sleeve portion 504, and a pressing portion 506 located on the other side of the rotating sleeve portion 504. The pressure receiving portion 505 is correspondingly provided with the extension rod 503, and the pressing portion 506 is correspondingly provided with the contact portion 406 of the auxiliary locking member 402. An abutting protrusion 507 is provided on the pressure receiving portion 505 of the actuating member 502. A torsional elastic member 213 is provided between the contact frame body 202 and the contact frame base 203. One end of the torsional elastic member 213 abuts against the contact frame body 202 or the contact frame base 203, and the other end extends out of the contact support 200 and abuts against the abutting protrusion 507.

[0036] When the extension rod 503 of the N-pole trip unit 501 extends, the extension rod 503 pushes the pressure part 505 of the actuating member 502, the actuating member 502 rotates around the rotating sleeve part 504, and the pressing part 506 of the actuating member 502 pushes the contact part 406 of the auxiliary locking member 402, causing the auxiliary locking member 402 to rotate.

[0037] Auxiliary locking component 402 The auxiliary locking member 402 is rotatably sleeved on the connecting shaft 405 of the contact bracket 200. The connecting shaft 405 connects between the first insertion hole 211 on the contact bracket body 202 and the second insertion hole 212 on the contact bracket cover 201. The auxiliary locking member 402 includes a contacting part 406 located at the lower position, a limiting part 407 located at the upper position, and a mounting part 408 located at the right side position. The pressing part 506 is provided corresponding to the contacting part 406, and the limiting part 407 is provided with a limiting groove 410. The mounting part 408 of the auxiliary locking member 402 is provided with a mounting protrusion 409. The abutment part 406 below the auxiliary locking member 402 is used to receive the drive of the toggle member 502, the limiting groove 410 on the upper limiting part 407 is used to cooperate with the main locking member 401 to achieve locking, and the mounting protrusion 409 on the right mounting part 408 is used to install the reset elastic member 413. The layout of each functional part is reasonable, which is conducive to reducing the overall size and improving the transmission efficiency.

[0038] Main locking component 401 The main locking member 401 is rotatably sleeved on the central sleeve portion 204 of the contact support 200. The main locking member 401 has a sleeve hole through which it is sleeved onto the central sleeve portion 204 of the contact support body 202. The main locking member 401 has an abutment portion 411 corresponding to the limiting portion 407, which abuts against the limiting groove 410, achieving a locking engagement between the main locking member 401 and the auxiliary locking member 402. The main locking member 401 has a positioning groove 412 corresponding to the mounting protrusion 409, and a reset elastic member 413 is provided between the mounting protrusion 409 and the positioning groove 412. The reset elastic member 413 is used to rotate and reset the auxiliary locking member 402.

[0039] Contact support 200 The contact support 200 includes a contact support cover 201, a contact support body 202, and a contact support base 203. The contact support cover 201 is fastened to the contact support body 202, and the contact support base 203 is fastened to the contact support body 202. The contact support body 202 has a central sleeve portion 204, through which a rotating shaft 205 passes, and the contact support body 202 is rotatably connected to the bottom shell 101 via the rotating shaft 205. A recessed groove 207 is provided at the top of the contact support body 202, and the recessed groove 207 has a downwardly extending vertical section 208 and a horizontal section 209 located on the right side above the vertical section 208. An operating member 110 is rotatably mounted on the bottom shell 101. One end of the operating linkage 111 is inserted into the operating member 110, and the other end is inserted into the recessed groove 207. The contact holder body 202 has an abutment protrusion 210 adapted to the recess 207 on one side. The main locking member 401 has an arc-shaped segment 403 adapted to the shape of the recess 207, corresponding to the abutment protrusion 210. The other end of the operating linkage 111 is located between the abutment protrusion 210 and the arc-shaped segment 403. The main locking member 401 has a blocking protrusion 404 at the top of the arc-shaped segment 403, which prevents the operating linkage 111 from disengaging from the recess 207.

[0040] Leakage tripping process When a leakage fault occurs in the circuit, the extension rod 503 of the N-pole trip unit 501 extends, pushing the pressure portion 505 of the actuating member 502, causing the actuating member 502 to rotate around the rotating sleeve portion 504. The pressing portion 506 of the actuating member 502 pushes the contact portion 406 of the auxiliary locking member 402, causing the auxiliary locking member 402 to rotate. The limiting portion 407 of the auxiliary locking member 402 moves away from the main locking member 401, and the contact portion 411 of the main locking member 401 disengages from the limiting groove 410. After the main locking member 401 is released from its limit, it rotates in the opening direction, and the contact bracket 200 rotates synchronously in the opening direction. The contact bracket 200, through the contact connecting rod 301, drives the moving contact 300 away from the stationary contact 307, and simultaneously, the contact bracket 200, through the operating connecting rod 111, drives the operating member 110 to rotate to the disconnect position, completing the leakage trip.

[0041] Reset process After the contact bracket 200 is disconnected and reset, the torsion elastic element 213 drives the abutment protrusion 507 and the actuating element 502 to rotate, thereby resetting the actuating element 502 and the extension rod 503. The reset elastic element 413 rotates and resets the auxiliary locking element 402, causing the limiting groove 410 of the auxiliary locking element 402 to re-engage with the abutment part 411 of the main locking element 401, ensuring reliable locking action in the next operation. The various reset mechanisms cooperate with each other to ensure that the leakage current tripping mechanism can operate repeatedly.

[0042] It should be understood that the above embodiments are merely illustrative examples and are not intended to limit the invention. Based on the above embodiments, those skilled in the art can make appropriate adjustments and modifications to the specific structure of the N-pole trip unit 501, the specific shape of the actuating member 502, the specific mating relationship between the auxiliary locking member 402 and the main locking member 401, the specifications and elastic parameters of each elastic member, and the specific structure of the contact support 200, according to actual application requirements. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of the claims of this invention should be included within the scope of protection of this invention.

Claims

1. A leakage current tripping mechanism for an electromagnetic circuit breaker, characterized in that, include: The contact bracket (200) is rotatably mounted on the bottom shell (101) of the circuit breaker; N-pole trip unit (501), including an extension rod (503); A toggle member (502) is rotatably mounted on the bottom shell (101) of the circuit breaker. The toggle member (502) includes a rotating sleeve part (504), a pressure receiving part (505) located on one side of the rotating sleeve part (504), and a pressing part (506) located on the other side of the rotating sleeve part (504). The pressure receiving part (505) is correspondingly provided with the extension rod (503). An auxiliary locking member (402) is rotatably sleeved on the connecting shaft (405) of the contact bracket (200). The auxiliary locking member (402) includes a contact part (406) located at the lower position, a limiting part (407) located at the upper position, and a mounting part (408) located at the right side position. The pressing part (506) is provided corresponding to the contact part (406), and the limiting part (407) is provided with a limiting groove (410). The main locking member (401) is rotatably sleeved on the central sleeve portion (204) of the contact bracket (200). The main locking member (401) is provided with an abutting portion (411) in the limiting groove (410) at the position corresponding to the limiting portion (407), so as to realize the locking cooperation between the main locking member (401) and the auxiliary locking member (402). When the extension rod (503) of the N-pole trip unit (501) extends, it pushes the pressure part (505) of the actuating member (502) to rotate, so that the pressing part (506) abuts against the contact part (406) and drives the limiting part (407) of the auxiliary locking member (402) to rotate away from the main locking member (401), so that the contact part (411) disengages from the limiting groove (410) and completes the leakage trip.

2. The electromagnetic circuit breaker leakage tripping mechanism according to claim 1, characterized in that, The mounting part (408) of the auxiliary locking member (402) is provided with a mounting protrusion (409), and the main locking member (401) is provided with a positioning groove (412) corresponding to the position of the mounting protrusion (409). A reset elastic member (413) is provided between the mounting protrusion (409) and the positioning groove (412), and the reset elastic member (413) is used to rotate and reset the auxiliary locking member (402).

3. The electromagnetic circuit breaker leakage tripping mechanism according to claim 1 or 2, characterized in that, The contact support (200) includes a contact support cover (201), a contact support body (202), and a contact support base (203); the contact support cover (201) is fastened to the contact support body (202), and the contact support base (203) is fastened to the contact support body (202); the contact support body (202) is provided with a central sleeve part (204), and a rotating shaft (205) passes through the central sleeve part (204), and the contact support body (202) is rotatably connected to the bottom shell (101) through the rotating shaft (205).

4. The electromagnetic circuit breaker leakage tripping mechanism according to claim 3, characterized in that, The pressing part (505) of the actuating member (502) is provided with an abutment protrusion (507); a torsional elastic member (213) is provided between the contact frame body (202) and the contact frame base (203). One end of the torsional elastic member (213) abuts against the contact frame body (202) or the contact frame base (203), and the other end extends out of the contact support (200) and abuts against the abutment protrusion (507). After the contact support (200) is disconnected and reset, the torsional elastic member (213) drives the abutment protrusion (507) and the actuating member (502) to rotate, and realizes the reset of the actuating member (502) and the extension rod (503).

5. The electromagnetic circuit breaker leakage tripping mechanism according to claim 4, characterized in that, The main locking member (401) is provided with a sleeve hole, and the main locking member (401) is sleeved on the central sleeve part (204) of the contact frame body (202) through the sleeve hole.

6. The electromagnetic circuit breaker leakage tripping mechanism according to claim 5, characterized in that, A recessed groove (207) is provided above the contact frame body (202). The recessed groove (207) has a downwardly extending vertical section (208) and a horizontal section (209) located on the right side above the vertical section (208). An operating component (110) is rotatably provided on the bottom shell (101), and an operating linkage (111) is also included. One end of the operating linkage (111) is inserted into the operating component (110), and the other end is inserted into the recessed groove (207). An abutting protrusion (210) adapted to the recessed groove (207) is provided on one side of the contact frame body (202).

7. The electromagnetic circuit breaker leakage tripping mechanism according to claim 6, characterized in that, The main locking member (401) has an arc-shaped segment (403) that matches the shape of the recessed groove (207) at the position corresponding to the abutting protrusion (210). The other end of the operating linkage (111) is located between the abutting protrusion (210) and the arc-shaped segment (403). The main locking member (401) has a blocking protrusion (404) at the top of the arc-shaped segment (403). The blocking protrusion (404) is used to restrict the operating linkage (111) from disengaging from the recessed groove (207).

8. The electromagnetic circuit breaker leakage tripping mechanism according to claim 7, characterized in that, When the leakage trip occurs, the auxiliary locking part (402) rotates to disengage the abutting part (411) of the main locking part (401) from the limit groove (410). After the main locking part (401) is released from the limit, it rotates in the opening direction, and the contact bracket (200) rotates in the opening direction simultaneously. The contact bracket (200) drives the moving contact (300) away from the stationary contact (307) through the contact connecting rod (301). At the same time, the contact bracket (200) drives the operating part (110) to rotate to the disconnect position through the operating connecting rod (111).

9. The electromagnetic circuit breaker leakage tripping mechanism according to claim 3, characterized in that, The auxiliary locking element (402) is rotatably sleeved on the connecting shaft (405), which is connected between the first insertion hole (211) on the contact frame body (202) and the second insertion hole (212) on the contact frame cover (201).

10. The electromagnetic circuit breaker leakage tripping mechanism according to claim 1, characterized in that, The N-pole trip unit (501) is a residual current electromagnetic trip unit used to detect residual current in the circuit and drive the extension rod (503) to extend.

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