A circuit breaker with leakage protection function

Abstract

The application relates to a circuit breaker with a leakage protection function, and relates to the technical field of circuit breakers, which comprises a shell, a main switch mechanism, a leakage detection unit, a mechanical tripping mechanism, a speed discrimination mechanism, a state indicating mechanism and an electrical state monitoring unit. The leakage detection unit comprises a zero sequence current transformer and a moving magnetic yoke, the speed discrimination mechanism is composed of a motion amplification assembly, a swing arm, a damper and a pre-compressed trigger elastic piece, can judge whether to trigger tripping according to the different driving conditions of the moving magnetic yoke; the motion amplification assembly comprises a rack and a sector gear; the damper is a hydraulic damper; and the trigger elastic piece is a trigger spring. The state indicating mechanism has an indicating piece coaxial with the swing arm and an observation window, and the electrical state monitoring unit has a single-phase current transformer and a display. The application can accurately distinguish between continuous leakage and transient interference, reliably trigger tripping, and can realize the technical effects of real-time monitoring of an electrical state and intuitive display of a working state.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to a circuit breaker with leakage protection function. Background Technology

[0002] In power systems, leakage current protection is crucial for ensuring personnel safety and the normal operation of equipment. With the continuous development of power technology, leakage current protection technology is also constantly improving. Leakage current protection devices can promptly cut off the power supply when a leakage fault occurs in the circuit, preventing electric shock accidents and electrical fires. They are widely used in various fields such as industrial, commercial, and residential electricity use, playing a key role in improving the safety and reliability of electricity use.

[0003] In related technologies, various methods are commonly used to solve the problem of leakage current detection and protection. The most common is electronic leakage current protection, which mainly uses electronic circuits to detect and analyze leakage current. Electronic components amplify and process the detected weak leakage current signal, and then determine whether to trigger a tripping action based on a preset threshold. Another common method is traditional electromagnetic leakage current protection, which is based on the principle of electromagnetic induction. When the magnetic field generated by the leakage current reaches a certain strength, it drives the tripping mechanism. Additionally, some leakage current protection devices use simple current transformers to detect leakage current; when the detected current exceeds a set value, the corresponding protection action is triggered.

[0004] However, electronic leakage current protection is susceptible to electromagnetic interference, power grid harmonics, lightning surges, and other electrical factors, leading to malfunctions and reduced power supply continuity. Traditional electromagnetic leakage current protection may not be sensitive enough to some minute leakage signals, failing to detect leakage faults accurately and in a timely manner. Protection methods using simple current transformers have relatively low detection accuracy and reliability, making them unsuitable for leakage protection requirements in complex electrical environments. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a residual current circuit breaker.

[0006] A residual current circuit breaker includes a housing, a main switching mechanism, a residual current detection unit, and a mechanical tripping mechanism. The residual current detection unit includes a zero-sequence current transformer and a moving magnetic yoke that can be driven linearly by its magnetic field. It also includes a speed determination mechanism, which includes: The motion amplification component, connected to the moving magnetic yoke drive, is used to amplify the linear motion of the moving magnetic yoke; The swing arm is hinged to the motion amplification component and can rotate around its fixed axis under the action of the motion amplification component. The damper has a fixed cylinder body and its push rod is connected to the swing arm drive. The damper is configured to provide a damping torque that is positively correlated with the angular velocity for the rotation of the swing arm. The pre-compressed trigger elastic element acts on the swing arm at one end and on the trigger part of the mechanical release mechanism at the other end. When the moving magnetic yoke is continuously driven by leakage current, the amplified motion drives the swing arm to rotate slowly against the damping torque, and the deformation of the trigger elastic element accumulates to a critical value, thereby triggering the trip; when the moving magnetic yoke is driven by instantaneous disturbance, the high damping torque generated by the damper suppresses the rapid rotation of the swing arm and prevents the deformation of the trigger elastic element from reaching the critical value.

[0007] By adopting the above technical solution, a purely mechanical logic chain of "motion amplification → speed discrimination (damper) → energy accumulation (elastic element) → triggering" is constructed, enabling the circuit breaker to distinguish the nature of signals at the physical level. This eliminates the possibility of malfunction caused by any form of instantaneous electrical interference from the operating principle, achieving fundamentally high reliability. At the same time, it provides a leakage current protection technology solution that is completely independent of electronic and traditional electromagnetic types, providing an alternative technology option for high-reliability application scenarios and broadening the technical boundaries of the industry.

[0008] Optionally, the motion amplification assembly includes a meshing rack and a sector gear; the rack is fixedly connected to the moving magnetic yoke; the sector gear is coaxially fixed to the first rotating shaft; the radius of the input part of the sector gear is smaller than the radius of its output part; and the swing arm is hinged to the output part of the sector gear.

[0009] By adopting the above technical solution, the structure is compact and the torque transmission is efficient. It achieves a large amplification factor in a limited space and effectively converts linear force into rotational torque, making the drive arm more efficient and reliable.

[0010] Optionally, the moving magnetic yoke is slidably disposed within the slide rail of the first bracket and connected to the first bracket via a return spring; the rack is fixed to the side of the moving magnetic yoke.

[0011] By adopting the above technical solutions, the slide ensures the linearity of the moving magnetic yoke's trajectory, making the air gap between it and the zero-sequence current transformer's magnetic field change uniform, resulting in more stable magnetic characteristics and improved detection linearity. The reset spring ensures that the moving magnetic yoke can automatically and accurately return to the initial zero position after each action, providing a highly repeatable reference point for the next leakage current detection and ensuring the stability of the product during long-term use.

[0012] Optionally, the damper is a hydraulic damper; the damper's push rod is connected to the connecting groove in the swing arm via a ball joint, and the ball joint can slide along the connecting groove.

[0013] By adopting the above technical solutions, the hydraulic damper can provide an extremely stable and linear damping force-velocity relationship, making the mechanical discrimination threshold between high speed and low speed clear, and the anti-interference filtering effect precise and consistent; the ball joint connecting rod and the connecting groove cooperate to form a universal joint connection, which can automatically compensate for the angle change between the swing arm and the damper push rod and the slight assembly alignment error when the swing arm rotates, eliminate harmful lateral forces, protect the damper from damage, and significantly improve the life and reliability of the mechanism.

[0014] Optionally, the triggering elastic element is a triggering spring, which is housed in a triggering groove fixed on the second bracket; one end of the triggering spring abuts against the swing arm, and the other end is connected to a triggering rod that can slide in the triggering groove; the end of the triggering rod abuts against the triggering part of the mechanical release mechanism.

[0015] By adopting the above technical solution, the triggering elastic element is concretized as a triggering spring housed in the triggering groove and its connection relationship is defined. The triggering groove limits the space and direction of the spring deformation, so that the critical deformation corresponds to a clear and measurable mechanical position. The triggering threshold is physically visible, easy to detect and calibrate. The triggering spring abuts against the swing arm, and the triggering rod abuts against the triggering arm, forming a direct thrust transmission, minimizing the loss and dispersion of energy during the transmission process, and ensuring that the accumulated spring potential energy can be efficiently used for triggering the trip.

[0016] Optionally, the triggering part of the mechanical tripping mechanism is the triggering arm on the tripping half shaft; the triggering elastic element is in a pre-compressed state in the initial state, and its pre-compression force and stiffness coefficient are matched with the damping coefficient of the damper, which together determine the rated leakage current value of the circuit breaker.

[0017] By adopting the above technical solution, the pre-compression force and stiffness coefficient of the trigger elastic element are matched with the damping coefficient of the damper, realizing mechanical parametric design and electronic calibration-free operation. This results in a high degree of design freedom, allowing engineers to precisely "design" any desired operating current value by adjusting the spring selection, damper selection, and pre-compression setting. It also frees production and maintenance from dependence on the accuracy of electronic component parameters, software algorithms, and complex calibration procedures. No power supply or special calibration equipment is required; performance settings can be completed simply by replacing standard mechanical parts or adjusting the pre-tightening screws, reducing production costs, simplifying processes, and improving yield.

[0018] Optionally, a status indication mechanism is also included; the status indication mechanism includes an indicator coaxially arranged with the swing arm and an observation window located at a corresponding position on the housing; the indicator is provided with different markings corresponding to the initial position, warning position and tripping position of the swing arm respectively.

[0019] By adopting the above technical solution, the residual current circuit breaker adds a mechanical status indication mechanism coaxial with the swing arm, which can provide intuitive, reliable, and power-free status feedback. The status feedback is real and can realize preventive safety warnings, solving the problem of possible failure or false alarms of electronic sensors. It allows users to perceive the risk of line insulation deterioration in advance, realizing a safety upgrade from "passive protection" to "active warning".

[0020] Optionally, it also includes an electrical condition monitoring unit, which includes a single-phase current transformer sleeved on each phase conductor and a display electrically connected to each single-phase current transformer; the display is located on the surface of the housing.

[0021] By employing an electrical condition monitoring unit, including a single-phase current transformer mounted on each phase conductor and a display electrically connected to it and located on the surface of the housing, the real-time digital display function of the load current of each phase can be added, enabling the product to simultaneously possess protection, early warning, and monitoring functions, thereby improving the integration of the distribution cabinet and the user experience. When a trip occurs, by combining the historical current data on the display and the status of the mechanical indicator window, it is possible to quickly determine whether the trip was caused by overload, short circuit, or leakage, greatly simplifying the fault diagnosis process.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Construct a pure mechanical logic chain of "motion amplification → speed discrimination (damper) → energy accumulation (elastic element) → triggering" to eliminate the possibility of malfunction caused by any form of instantaneous electrical interference, achieve fundamental high reliability, and solve the problem that electronic leakage protection is susceptible to malfunction due to electrical factors. 2. By using a rack and pinion system as the motion amplification component, the tiny linear displacement of the moving magnetic yoke can be linearly and without slippage amplified into a larger angular displacement of the sector gear output section, ensuring the accuracy and consistency of signal transmission and solving the problem that traditional electromagnetic leakage protection methods are not sensitive enough to tiny leakage signals. 3. The integrated electrical condition monitoring unit adds a real-time digital display function for the load current of each phase, enabling a single product to have three functions: protection, early warning, and monitoring. This solves the problem of relatively low detection accuracy and reliability of protection methods using simple current transformers. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a structural schematic diagram of the present application, mainly illustrating a unidirectional current transformer; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4This is a schematic diagram of the exploded structure of this application, mainly showing the velocity discrimination mechanism.

[0024] Figure Descriptions: 1. Housing; 2. Unidirectional current transformer; 3. Display; 4. Current guiding assembly; 5. Zero-sequence current transformer; 6. First bracket; 7. Slide rail; 8. Slider; 9. Moving magnetic yoke; 10. Return spring; 11. Second bracket; 12. First rotating shaft; 13. Sector gear; 1301. Input section; 1302. Output section; 14. Rack; 15. Second rotating shaft; 16. Swing arm; 17. Linkage rod; 18. Hydraulic damper; 19. Ball linkage; 20. Connecting groove; 21. Trigger groove; 22. Trigger spring; 23. Trigger rod; 24. Tripping half shaft; 25. Limit block; 26. Observation window; 27. Indicator code disk; 28. Indicator rod. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0026] A circuit breaker with leakage protection function, as described in the following figure Figure 1 The circuit breaker includes a housing 1, a main switching mechanism disposed within the housing 1, a leakage current detection unit, a mechanical tripping mechanism, an electrical status monitoring unit, a status indication mechanism, and a speed discrimination mechanism. The leakage current detection unit senses leakage current and triggers the mechanical tripping mechanism; the speed discrimination mechanism automatically determines the nature of the mechanical tripping motion based on the leakage current generated by the leakage current detection unit and makes a decision on whether to trip; the electrical status monitoring unit monitors the internal circuit current status in real time; and the status indication mechanism displays whether the circuit breaker is leaking current and the extent of the leakage. This invention reduces the impact of electrical factors such as electromagnetic interference, power grid harmonics, and lightning surges, effectively solving the problem of malfunction and greatly improving power supply continuity.

[0027] Reference Figure 1 , Figure 2 The electrical condition monitoring unit includes multiple single-phase current transformers and a display 3. The single-phase current transformers are inserted inside the housing 1 and connected to the receiving end of the display 3 via wires. The display 3 is fixedly connected to the outer surface of the housing 1. Additionally, the main switching mechanism includes a current-conducting assembly 4 connected to an external circuit. The current-conducting assembly 4 contains multiple phase lines and one neutral line, and each phase line and neutral line is connected to a wire of the corresponding phase in the external circuit according to its own phase polarity. Simultaneously, a unidirectional current transformer 2 is fitted outside each phase line and neutral line to monitor the operation of each current-conducting assembly 4 and transmit the received signals to the display 3.

[0028] The leakage current detection unit includes a zero-sequence current transformer 5, which is fixedly connected inside the housing 1 and connected to the display 3 via wires. The zero-sequence current transformer 5 has through-holes through which both the phase and neutral wires pass. When the circuit breaker is in normal operation, the sum of all outgoing currents through the phase and neutral wires of the zero-sequence current transformer 5 equals the sum of all returning currents; therefore, their vector sum is zero. When a leakage current occurs, some current does not return through the predetermined path, causing the vector sum to be non-zero. At this time, an induced current is generated within the zero-sequence current transformer 5 and transmitted to the display 3 via the wires.

[0029] Reference Figure 2 , Figure 3 , Figure 4 A first bracket 6 is fixedly connected inside the housing 1. A slide rail 7 is formed inside the first bracket 6 facing the zero-sequence current transformer 5. A slider 8 is slidably connected to the slide rail 7, and a moving magnetic yoke 9 is fixed to the slider 8 by epoxy resin. The moving magnetic yoke 9 is made of soft magnetic material and is cylindrical. The planar end face of the moving magnetic yoke 9 facing away from the slider 8 points towards the air gap end face of the toroidal core in the zero-sequence current transformer 5. This improves the magnetization efficiency of the zero-sequence current transformer 5 on the moving magnetic yoke 9.

[0030] A return spring 10 is fixedly connected to the side of the slider 8 away from the moving yoke 9, and the other end of the return spring 10 is fixedly connected to the first bracket 6. This allows the induced current and magnetic field generated in the zero-sequence current transformer 5 to magnetize the soft magnetic material of the moving yoke 9. The moving yoke 9 and the zero-sequence current transformer 5 are magnetically attracted, causing the moving yoke 9 to slide closer to the zero-sequence current transformer 5 against the tension of the return spring 10, thereby stretching the return spring 10. When the induced current in the zero-sequence current transformer 5 is exhausted, the induced magnetic field at the zero-sequence current transformer 5 disappears, and the moving yoke 9 loses its magnetism, allowing the return spring 10 to slide the moving yoke 9 away from the zero-sequence current transformer 5.

[0031] The speed discrimination mechanism includes a second bracket 11 fixedly connected to the housing 1 on one side of the first bracket 6. The second bracket 11 is rotatably connected to a sector gear 13 via a first rotating shaft 12. The sector gear 13 includes an input section 1301 and an output section 1302. The centers of the output section 1302 and the input section 1301 are on the same straight line as the center of the first rotating shaft 12. The radius of the input section 1301 is smaller than the radius of the output section 1302. Simultaneously, a rack 14 is fixedly connected to the arc-shaped side of the moving magnetic yoke 9, meshing with the input section 1301. When the moving magnetic yoke 9 slides, the rack 14 drives the input section 1301 to rotate along the first rotating shaft 12, causing the output section 1302 to rotate synchronously, thereby amplifying the minute movements of the moving magnetic yoke 9.

[0032] The second support 11 is rotatably connected to the second rotating shaft 15, and the second rotating shaft 15 is fixedly connected to an L-shaped metal swing arm 16. A sliding groove is provided at the end of the short arm of the metal swing arm 16, and a linkage rod 17 is slidably disposed within it. The linkage rod 17 is integrally formed with a spherical block, and the linkage rod 17 is slidably connected to the end of the short arm of the swing arm 16 through the spherical block. Its other end is fixedly connected to the surface of the output part 1302 of the sector gear 13. This allows the moving magnetic yoke 9 to slide and drive the metal swing arm 16 to rotate along the first rotating shaft 12 via the sector gear 13.

[0033] A hydraulic damper 18 is fixedly connected to the second bracket 11 via clamps, and the push rod of the hydraulic damper 18 is fixedly connected to a ball joint connecting rod. Meanwhile, a connecting groove 20 is provided on the short arm of the swing arm 16, passing through the side of the short arm of the swing arm 16, and the ball joint connecting rod extends into the connecting groove 20. Furthermore, the inner wall of the connecting groove 20 has an inwardly concave arc-shaped surface, allowing the ball joint connecting rod to slide along the inner wall of the connecting groove 20 after it extends into the groove and engages with the ball head.

[0034] The second bracket 11 has a trigger groove 21, and a trigger spring 22 is installed in the trigger groove 21. The inner wall of the trigger groove 21 can limit the deformation direction of the trigger spring 22. A pressure plate is fixedly connected to the end of the long arm of the swing arm 16. The pressure plate extends into the trigger groove 21 and abuts against the trigger spring 22. A trigger rod 23 is fixedly connected to the other end of the trigger spring 22. The trigger rod 23 is slidably installed in the trigger groove 21.

[0035] The mechanical tripping mechanism includes a tripping half-shaft 24, whose trigger arm abuts against a trigger rod 23. Simultaneously, a limit block 25 is fixedly connected to the second bracket 11, abutting against the swing arm 16 when the swing arm 16 is in its initial state. When the swing arm 16 is in its initial state, its long arm compresses the trigger spring 22, placing it in a pre-compressed state. Furthermore, the pre-compression force and stiffness of the trigger spring 22 are matched in synergy with the damping coefficient of the damper. By designing a specific relationship between these three parameters, the desired operating current value can be set. Changing any one of these parameters adjusts the sensitivity of the operating current without altering electronic components or the program. This matching relationship ensures stable accumulation of deformation until triggering in the face of continuous leakage current, while effectively suppressing rapid movement and preventing false triggering in the face of transient interference due to the positive correlation between damping force and speed.

[0036] Reference Figure 1 , Figure 4The status indication mechanism includes an observation window 26 on the housing 1, and an indicator code disk 27 is fitted over the second rotating shaft 15. The indicator code disk 27 is fixedly connected to the second bracket 11 via a support rod. Simultaneously, an indicator rod 28 is fixedly connected to the arc-shaped surface of the second rotating shaft 15, allowing the swing arm 16 to control the rotation of the indicator rod 28 along the indicator code disk 27 via the second rotating shaft 15. Furthermore, the indicator code disk 27 is provided with indication areas for "normal," "warning" (leakage current but not reaching the activation value), and "tripped."

[0037] The implementation principle of this application embodiment is as follows: When the circuit breaker is operating normally, the vector sum of the phase current and neutral current in the zero-sequence current transformer 5 is zero, and it does not generate an induced magnetic field, so the moving yoke 9 is not magnetized. Under the action of the reset spring 10, the moving yoke 9 and the slider 8 and rack 14 fixed thereto remain in the initial position away from the zero-sequence current transformer 5. At this time, the sector gear 13 has no input, and the swing arm 16 abuts against the limit block 25 under the pre-pressure of the trigger spring 22, and is in the initial angular position. The damper push rod is in a half-extended state. Although the trigger spring 22 is pre-compressed, the force it exerts on the trigger arm of the trip half shaft 24 through the trigger rod 23 is less than the trip threshold. The "normal" area on the indicator code 27 is aligned with the observation window 26.

[0038] When a continuous leakage fault occurs in the circuit, the zero-sequence current transformer 5 induces a continuous magnetic field, magnetizing the moving yoke 9 and attracting it to move slowly and smoothly towards the zero-sequence current transformer 5, overcoming the tension of the reset spring 10. The moving yoke 9 drives the rack 14 to move linearly, driving the input part 1301 of the sector gear 13 meshing with it to rotate slowly. Since the radius of the output part 1302 of the sector gear 13 is larger than the radius of the input part 1301, according to the lever principle, this motion is amplified into a larger rotation angle (or torque) of the output part 1302, and transmitted to the short arm of the swing arm 16, driving the swing arm 16 to overcome the small damping torque of the damper and rotate slowly and continuously around its second axis 15. When the swing arm 16 rotates, its long arm further compresses the pre-compressed trigger spring 22 through the pressure plate, converting mechanical energy into the elastic potential energy of the spring for storage. During this process, the rotation of the swing arm 16 synchronously drives the indicator code disk 27 to rotate, and the observation window 26 displays a transition from the "normal" to the "warning" area. When leakage persists, the swing arm 16 rotates to a certain angle, causing the accumulated compression of the trigger spring 22 to reach its preset critical deformation. The force exerted by the trigger spring 22 on the trigger arm of the trip half-shaft 24 via the trigger rod 23 reaches the critical value, pushing the trigger arm and causing the trip half-shaft 24 to rotate, releasing the latch of the main switch mechanism. Under the action of the tripping spring, the main switch quickly disconnects the circuit, achieving leakage protection. At the moment of tripping, the indicator code 27 stabilizes in the "tripped" indication area.

[0039] When the line encounters a transient strong interference (such as a lightning surge), the zero-sequence current transformer 5 instantly induces an extremely strong magnetic field, driving the moving yoke 9 and rack 14 to move at high speed, and then attempting to drive the sector gear 13 and swing arm 16 to rotate at high speed. At this time, the hydraulic damper 18 connected to the swing arm 16, due to its physical characteristic that the damping torque is positively correlated with the angular velocity of motion, immediately generates a huge damping torque, acting like a "mechanical brake," strongly suppressing the rapid rotation of the swing arm 16. Most of the kinetic energy of the interference is rapidly absorbed and dissipated by the damper in the form of heat. The swing arm 16 only produces extremely small angular displacement jitter, and the compression of the trigger spring 22 hardly changes cumulatively. After the interference pulse ends, under the combined action of the tension of the reset spring 10, the return force of the damper itself, and the preload of the trigger spring 22, all components return to their initial state. Since the deformation of the trigger spring 22 is far from reaching the critical value, the tripping mechanism will not operate, thus effectively avoiding false tripping caused by transient interference. The indicator code 27 may experience slight vibrations before quickly returning to its original position and displaying "Normal".

[0040] In summary, this invention enhances the sensitivity of small signal detection through the "rack 14-sector gear 13" motion amplification mechanism, achieves the discrimination and filtering of mechanical motion speed through the "damper-swing arm 16" speed-sensitive mechanism, realizes the slow accumulation of energy and precise threshold triggering through the "pre-compression trigger spring 22" mechanism, and visualizes the internal state through mechanical linkage. The synergistic effect of this series of purely mechanical structures intelligently distinguishes between harmful continuous leakage current and harmless instantaneous interference, fundamentally solving the industry problem of leakage current protection malfunction. It also provides operation monitoring and status indication functions, significantly improving the reliability and safety of the power supply system.

[0041] 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 residual current circuit breaker, comprising a housing (1), a main switching mechanism, a residual current detection unit, and a mechanical tripping mechanism, characterized in that, The leakage current detection unit includes a zero-sequence current transformer (5) and a moving magnetic yoke (9) that can be driven by its magnetic field to move linearly. It also includes a speed determination mechanism, which includes: A motion amplification component is connected to the moving magnetic yoke (9) for amplifying the linear motion of the moving magnetic yoke (9); The swing arm (16) is hinged to the motion amplification component and can rotate around its fixed axis under the action of the motion amplification component; A damper, whose cylinder is fixedly mounted, has a push rod that is kinetically connected to the swing arm (16), and the damper is configured to provide a damping torque that is positively correlated with the angular velocity for the rotation of the swing arm (16); The pre-compressed trigger elastic element acts on the swing arm (16) at one end and on the trigger part of the mechanical release mechanism at the other end; When the moving magnetic yoke (9) is continuously driven by leakage current, the amplified motion drives the swing arm (16) to rotate slowly against the damping torque, and the deformation of the trigger elastic element accumulates to a critical value, thereby triggering the tripping; when the moving magnetic yoke (9) is driven by instantaneous interference, the high damping torque generated by the damper suppresses the rapid rotation of the swing arm (16) and prevents the deformation of the trigger elastic element from reaching the critical value.

2. The residual current circuit breaker according to claim 1, characterized in that, The motion amplification assembly includes a meshing rack (14) and a sector gear (13); the rack (14) is fixedly connected to the moving magnetic yoke (9); the sector gear (13) is coaxially fixed to the first rotating shaft (12); the radius of the input part (1301) of the sector gear (13) is smaller than the radius of its output part (1302); the swing arm (16) is hinged to the output part (1302) of the sector gear (13).

3. The residual current circuit breaker according to claim 2, characterized in that, The moving magnetic yoke (9) is slidably disposed in the slide rail (7) of the first bracket (6) and connected to the first bracket (6) by a return spring (10); the rack (14) is fixed to the side of the moving magnetic yoke (9).

4. The residual current circuit breaker according to claim 1, characterized in that, The damper is a hydraulic damper (18); the push rod of the damper is connected to the connecting groove (20) opened in the swing arm (16) through a ball joint connecting rod, and the ball joint connecting rod can slide along the connecting groove (20).

5. The residual current circuit breaker according to claim 1, characterized in that, The triggering elastic element is a triggering spring (22), which is housed in a triggering groove (21) fixed on the second bracket (11); one end of the triggering spring (22) abuts against the swing arm (16), and the other end is connected to a triggering rod (23) that can slide in the triggering groove (21); the end of the triggering rod (23) abuts against the triggering part of the mechanical release mechanism.

6. The residual current circuit breaker according to claim 5, characterized in that, The triggering part of the mechanical tripping mechanism is the triggering arm on the tripping half shaft (24); the triggering elastic element is in a pre-compression state in the initial state, and its pre-compression force and stiffness coefficient are matched with the damping coefficient of the damper, which together determine the rated leakage current value of the circuit breaker.

7. The residual current circuit breaker according to claim 1, characterized in that, It also includes a status indication mechanism; The status indication mechanism includes an indicator coaxially arranged with the swing arm (16) and an observation window (26) located at a corresponding position on the housing (1); The indicator is provided with different markings corresponding to the initial position, warning position and tripping position of the swing arm (16).

8. The residual current circuit breaker according to claim 1, characterized in that, It also includes an electrical condition monitoring unit, which includes a single-phase current transformer sleeved on each phase conductor and a display (3) electrically connected to each single-phase current transformer; the display (3) is disposed on the surface of the housing (1).

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