A residual current circuit breaker

Abstract

The application relates to the technical field of circuit breakers, and discloses a residual current protection circuit breaker which comprises a shell, movable contacts and static contacts arranged in the shell, and a tripping mechanism arranged in the shell, the tripping mechanism comprising an electromagnetic tripping coil and a transmission assembly, the movable contacts and the static contacts are arranged in multiple groups, the movable contacts comprise connecting portions and conductive portions arranged at the two ends of the connecting portions, the connecting portions are rotationally arranged in the shell, the conductive portions are used for electrically connecting with the static contacts, one static contact is arranged at the two ends of each movable contact, a rotating column is arranged on each connecting portion, a connecting rod is commonly arranged on the rotating columns, a driving arm is rotationally arranged on the connecting rod, and the transmission assembly can drive the driving arm to rotate. The force transmission path is shorter and more direct, mechanical loss is small, the response speed of the tripping mechanism and the synchronization precision of action are effectively improved, and the breaking speed of the circuit breaker is accelerated.

Description

Technical Field

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

[0002] A residual current circuit breaker (RCCB) is an electrical safety protection device specifically designed to detect residual current in a circuit and automatically disconnect the power supply in case of danger. Also known as a leakage current switch or residual current device (RCD), its core function is to prevent electric shock and electrical fires. By comparing the current flowing into and out of the circuit, it can disconnect the circuit in a very short time when an unbalanced current exceeds a preset threshold, thereby protecting other electrical components in the power system and improving electrical safety.

[0003] In related technologies, residual current circuit breakers include a housing, moving and stationary contacts housed within the housing, and a tripping mechanism housed within the housing. The tripping mechanism typically includes an electromagnetic trip coil and a transmission assembly connected to the moving and stationary contacts. When a circuit fault occurs, the magnetic force generated by the electromagnetic trip coil drives the transmission assembly to actuate, thereby disconnecting the moving and stationary contacts and protecting the power system.

[0004] However, the transmission components in the aforementioned residual current circuit breakers have slow response speeds and low stability, resulting in slow circuit breaker breaking speeds. The transmission components also have complex structures and are prone to jamming during long-term use, affecting the protection effect of the circuit breaker. Therefore, improvements are needed. Summary of the Invention

[0005] In order to improve the response speed of the transmission components in the circuit breaker and accelerate the breaking speed of the circuit breaker, this application provides a residual current protection circuit breaker.

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

[0007] A residual current circuit breaker includes a housing, a moving contact and a stationary contact disposed within the housing, and a tripping mechanism disposed within the housing. The tripping mechanism includes an electromagnetic tripping coil and a transmission assembly. Multiple sets of moving and stationary contacts are provided. Each moving contact includes a connecting portion and conductive portions disposed at both ends of the connecting portion. The connecting portion is rotatably disposed within the housing. The conductive portions are used for electrical connection with the stationary contacts. Each stationary contact is provided at one end of the moving contact. Each connecting portion is provided with a rotating column. A connecting rod is commonly provided on each rotating column. A driving arm is rotatably disposed on the connecting rod. The transmission assembly is capable of driving the driving arm to rotate.

[0008] By adopting the above technical solution, when the transmission component drives the drive arm to rotate, the rotational motion of the drive arm can be synchronously and directly transmitted to the rotating columns of all moving contacts through the connecting rod, thereby driving all moving contacts to rotate synchronously around the rotation center of their connecting parts, thus achieving rapid and consistent breaking or closing of all contacts. Compared with the chain-type or indirect transmission that may be used in some existing technologies, this rigid mechanical linkage method has a shorter and more direct force transmission path, less mechanical loss, effectively improves the response speed and synchronization accuracy of the tripping mechanism, and speeds up the breaking speed of the circuit breaker.

[0009] Optionally, multiple connecting rods are evenly arranged around the rotating column, and a fixing plate is provided on each connecting rod. The driving arm is rotatably mounted on one of the connecting rods.

[0010] By adopting the above technical solution, firstly, multiple connecting rods are evenly distributed around the circumference of the rotating column, making the connection between the rotating columns more stable. This allows the driving force transmitted from the drive arm to the connecting rods to act on the rotating parts of the rotating column and the moving contact in a multi-point, uniform manner, avoiding stress concentration, uneven rotation, or component deformation that may be caused by localized stress at a single point. This ensures the long-term stability and mechanical reliability of the moving contact under frequent operation. Secondly, the fixing plate commonly set on each connecting rod strengthens and stabilizes the linkage structure composed of the connecting rods and the rotating column. It connects multiple connecting rods into a more rigid, integrated structure, further improving the overall strength and rigidity of each connecting rod and the rotating column. The driving force transmitted from the drive arm to the connecting rod can be transmitted to another connecting rod through the fixing plate, thus creating a multi-point, uniform force distribution on the rotating column. This prevents the connecting rods from shifting or deforming due to long-term vibration or impact, thereby ensuring the accuracy and consistency of the transmission action and improving the service life and operational reliability of the circuit breaker.

[0011] Optionally, the drive arm has a mounting rod at the end away from the connecting rod, and a triangular plate is provided on the mounting rod. A trigger plate and a handle bracket are rotatably arranged in the housing. The handle bracket is used to drive the handle to rotate in the direction of closing or opening. The trigger plate is rotatably arranged on the side of the handle bracket near the mounting rod. The trigger plate abuts against the handle bracket. One end of the triangular plate is rotatably connected to the trigger plate. The hinge point of the handle bracket is located on the side of the mounting rod away from the trigger plate. A closing spring is provided on the mounting rod. One end of the closing spring is connected to the handle bracket. The closing spring is used to drive the handle bracket to rotate in the direction of opening. The transmission assembly can limit the trigger plate to the closed position.

[0012] By adopting the above technical solution, when the operator manually pushes the handle to close the circuit, the handle will drive the handle bracket to rotate in the closing direction. This, in turn, drives the trigger plate to rotate in the closing direction, causing the triangular plate to rotate in the closing direction. The triangular plate, through the mounting rod, drives the drive arm to move in the closing direction, causing the moving contact to rotate to the position where both ends contact the stationary contacts. During the rotation of the handle bracket in the closing direction, the drive arm moves away from the trigger plate and handle bracket, causing the moving contact to rotate in the closing direction. Therefore, the mounting rod moves away from the handle bracket, stretching the opening spring and maintaining a preload force that drives the handle bracket to rotate in the opening direction. Once the electromagnetic trip coil generates magnetic force to drive the transmission component, the transmission component releases the limit on the trigger plate. The handle bracket and trigger plate can then rotate in the opening direction under the force of the opening spring. This causes the trigger plate, through the triangular plate and mounting rod, to drive the drive arm in the opening direction, ultimately keeping the moving contact stably in the opening position.

[0013] By positioning the hinge point of the handle bracket on the side of the mounting rod furthest from the trigger plate, this lever layout optimizes force transmission efficiency, making the lever arm for manual closing longer than that of the trip spring, thus reducing the effort required for manual closing. Simultaneously, the trip spring acts directly on this lever system, storing elastic potential energy. When the transmission component releases its restraint on the trigger plate, the energy stored in the trip spring is rapidly released through this lever system, driving the handle bracket and the entire linked contact system to rotate quickly in the tripping direction, achieving rapid tripping. This highly integrated and optimized energy release path for manual operation, status holding, and automatic tripping significantly improves the speed and reliability of the entire closing-holding-tripping cycle.

[0014] Optionally, the transmission assembly includes a limiting block rotatably disposed in the housing, a reset plate rotatably disposed in the housing, and a drive rod disposed on the electromagnetic trip coil. The reset plate is used to limit the trigger plate to the closed position. A reset torsion spring is provided on the rotating shaft of the reset plate. The reset torsion spring has a tendency to drive the reset plate away from the trigger plate. The limiting block is disposed on the side of the reset plate away from the trigger plate. The limiting block can prevent the reset plate from rotating in the direction away from the trigger plate. The drive rod can drive the limiting block to rotate. A limiting torsion spring is provided on the rotating shaft of the limiting block. The limiting torsion spring is used to fix the limiting block at the position that limits the reset plate.

[0015] By adopting the above technical solution, under normal closing conditions, the reset plate remains in the closed position due to the obstruction of the limit block, thereby limiting the trigger plate to the closed position. When a fault occurs and the electromagnetic trip coil actuates, the drive rod is pushed, directly driving the limit block to rotate against the force of the limit torsion spring. Once the limit block rotates and releases the obstruction on the reset plate, the reset plate will quickly rotate away from the trigger plate under the action of its own reset torsion spring, thereby releasing the limit on the trigger plate. At this time, the mechanism driven by the opening spring, such as the handle bracket, is no longer constrained and immediately performs the opening action. The action logic is clear, the link from the electromagnetic trip coil actuation to the release of the mechanical limit is too short, the response is extremely fast, and the use of the torsion spring for reset allows the relevant components to automatically or through simple operation reset to the ready-to-trigger state after the fault is cleared. The structure of the limit block and the reset plate is relatively simple, with few moving parts, and it is not prone to jamming during long-term use, effectively solving the problem of complex transmission component structure and easy jamming during long-term use.

[0016] Optionally, the reset plate is disposed on one side of the trigger plate. The reset plate includes a limiting part and an abutting part. The limiting part is rotatably disposed in the housing. The abutting part abuts against the limiting block. A limiting groove is formed on the limiting part. A stop block is provided on the trigger plate. When the trigger plate is in the closed position, the stop block extends into the limiting groove. The groove wall of the limiting groove can prevent the stop block from moving.

[0017] By adopting the above technical solution, when the circuit breaker closes, the stop block on the trigger plate precisely inserts into the limit groove of the reset plate, providing a very direct and robust method for locking the closing position. Specifically, the groove wall of the limit groove and the side of the stop block engage to form a surface contact mechanical constraint, effectively resisting the force of the opening spring attempting to pull the trigger plate and handle bracket to rotate. This ensures that the closed state is extremely stable under fault-free conditions, preventing accidental tripping. Simultaneously, this combination of the limit groove and the stop block allows the stop block to disengage from the limit groove without obstruction when the reset plate rotates and moves away from it. The action is crisp and clean, without the risk of friction or snagging, further ensuring the speed and reliability of the tripping action.

[0018] Optionally, the limiting block includes a rotating part, a stop part disposed on the rotating part, and a transmission part connected to the drive rod. The rotating part is rotatably disposed in the housing. The stop part is provided with a limiting inclined surface and a guiding arc surface. When the reset plate is in the closed position, the limiting inclined surface abuts against the reset plate, and the guiding arc surface is used to guide the reset plate to rotate towards the trigger plate.

[0019] By adopting the above technical solution, firstly, the contact between the limiting inclined surface and the reset plate in the closed state provides a stable self-locking angle, enhancing the closing holding force. Secondly, during the circuit breaker closing operation, the reset plate needs to move towards the trigger plate to complete the locking. The guiding arc surface provides a smooth guide for this movement of the reset plate, allowing it to smoothly slide over the protruding part of the limiting block, ultimately causing the limiting inclined surface to contact the reset plate, thereby locking the reset plate. This optimizes the closing feel, avoids jamming during the closing process or situations requiring a strong impact to lock, making the operation smoother, reducing impact wear between components, and improving the lifespan of the mechanism and its reliability under long-term use.

[0020] Optionally, the transmission part is connected to the rotating part, and the transmission part has a connecting hole, with one end of the drive rod extending into the connecting hole.

[0021] By adopting the above technical solution, the connection between the connecting hole and the end of the drive rod is a pivotal connection with a certain clearance. This connection method allows the drive rod to swing or move within a certain range, while effectively converting the linear motion or small-angle oscillation generated by the electromagnetic trip coil into the torque required to drive the limit block to rotate, ensuring the sensitivity of the tripping mechanism. The connection structure is simple and easy to process and assemble, making the connection point between the drive rod and the transmission part less prone to loosening or excessive wear due to long-term operation, ensuring the reliability and durability of the electromagnetic trip signal transmission to the mechanical actuator.

[0022] Optionally, an indicator block is rotatably disposed within the housing. The indicator block is provided with a closing indicator and a closing indicator. The rotation direction of the indicator block is consistent with the rotation direction of the handle bracket. The closing indicator and the closing indicator are arranged along the rotation direction of the indicator block. An observation window is provided on the housing, and the indicator block is disposed at the observation window. An active plate and a passive plate are slidably disposed within the housing. The active plate is disposed on the connecting rod. One end of the passive plate abuts against the active plate, and the other end abuts against the indicator block. When the moving contact is activated, the passive plate can push the indicator block to rotate.

[0023] By adopting the above technical solution, the indicator block is mechanically connected to the active plate, driven plate, and connecting rod. Therefore, the rotation state of the indicator block is strictly synchronized and corresponds to the opening and closing state of the moving contact in real time. When the moving contact moves, the connecting rod drives the active plate to slide, which in turn pushes the driven plate to slide, thereby driving the indicator block to rotate. This causes the corresponding closing or opening indicator to appear in the observation window, allowing operators to observe the opening and closing status inside the circuit breaker. This mechanically direct connection indication method is 100% accurate compared to indirect judgment based on handle position or electronic indication. It is unaffected by human error or electronic malfunction and eliminates the need for additional electronic components for the indication function, saving on circuit breaker production costs. It provides users or maintenance personnel with clear and accurate information on the true state of the circuit breaker's internal contacts, greatly improving equipment safety and maintainability, reducing the risk of live operation due to misjudgment of the circuit breaker's state, and providing an intuitive and reliable opening and closing status indication function.

[0024] Optionally, the active plate has a sliding hole, and the connecting rod extends into the sliding hole, wherein the diameter of the sliding hole is larger than the diameter of the connecting rod.

[0025] By adopting the above technical solution, the connecting rod extends into the sliding hole, allowing the driving arm to drive the active plate to slide, thereby driving the driven plate and the indicator block to move. This ensures a good driving effect of the connecting rod on the active plate, thus guaranteeing the indicating function of the indicator block. The diameter of the sliding hole is larger than the diameter of the connecting rod, allowing the connecting rod to move within the sliding hole. This enables the arc-shaped movement path of the connecting rod to drive the active plate to slide in a straight line, allowing the active plate to accurately drive the driven plate and the indicator block to move. Furthermore, when the active plate is damaged after long-term use, it can be removed from the connecting rod for replacement. This allows the active plate to be replaced individually without replacing the entire circuit breaker, reducing maintenance costs and extending the service life of the circuit breaker.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Through a rigid synchronous linkage mechanism consisting of connecting rods and rotating columns, the movement of the drive arm is directly and synchronously transmitted to all moving contacts. The force transmission path is short and efficient, ensuring that the multi-pole contacts can break almost simultaneously and instantaneously in the event of a fault, significantly shortening the total breaking time and improving the breaking speed.

[0028] 2. The use of a circumferentially evenly arranged multi-connecting rod and fixed plate structure improves the overall rigidity and strength of the rotating column and connecting rod structure, resulting in uniform stress distribution. The guide arc surface on the limit block ensures smooth closing operation and reduces impact and wear.

[0029] 3. By mechanically connecting the indicator block to the connecting rod, absolute synchronization between the indicated status and the actual position of the moving contact is ensured, providing users with clear and reliable visual feedback on the opening and closing status, greatly enhancing the safety of equipment operation and maintenance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the structure used to display the indicator block after the hidden part of the shell is shown in the embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the structure used to display the moving contact after the rotating column is hidden in the embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the structure of the reset plate shown after the electromagnetic trip coil is hidden in the embodiment of this application.

[0034] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0035] Figure 6 This is a structural schematic diagram of the circuit breaker in the embodiment of this application, showing the closed state of the circuit breaker after hiding part of the housing.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Housing; 11. Observation window; 12. Active plate; 121. Sliding hole; 13. Driven plate; 14. Moving contact; 141. Connecting part; 142. Conductive part; 143. Rotating column; 144. Connecting rod; 145. Fixing plate; 146. Drive arm; 147. Mounting rod; 148. Triangular plate; 149. Opening spring; 15. Stationary contact; 16. Trigger plate; 161. Stop block; 17. Handle bracket; 2. Indicator block 21. Closing indicator; 22. Opening indicator; 3. Tripping mechanism; 31. Electromagnetic tripping coil; 32. Transmission assembly; 321. Limit block; 322. Reset plate; 323. Drive rod; 324. Limiting part; 325. Abutting part; 326. Limiting groove; 327. Reset torsion spring; 33. Rotating part; 331. Stopping part; 332. Transmission part; 333. Limiting inclined surface; 334. Guide arc surface; 335. Connecting hole. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0039] This application discloses a residual current protection circuit breaker.

[0040] Reference Figure 1 and Figure 2 A residual current protection circuit breaker includes a housing 1, an indicator block 2 is rotatably disposed in the housing 1, the indicator block 2 is provided with a closing indicator 21 and a opening indicator 22, the closing indicator 21 and the opening indicator 22 are arranged along the rotation direction of the indicator block 2, and an observation window 11 is opened on the housing 1, the indicator block 2 is disposed at the observation window 11.

[0041] Reference Figure 2 The outer casing 1 also has an active plate 12 and a driven plate 13 slidably disposed therein. The active plate 12 has a sliding hole 121. One end of the driven plate 13 abuts against the active plate 12 and the other end abuts against the indicator block 2. When the moving contact 14 is activated, the driven plate 13 can push the indicator block 2 to rotate.

[0042] Reference Figure 2 The housing 1 also includes a moving contact 14, a stationary contact 15, and a tripping mechanism 3. The tripping mechanism 3 includes an electromagnetic tripping coil 31 and a transmission assembly 32. When the moving contact 14 actuates, the driven plate 13 can push the indicator block 2 to rotate. Multiple sets of moving contacts 14 and stationary contacts 15 are provided, which can increase the circuit breaking capacity and improve the protection performance of the circuit breaker.

[0043] Reference Figure 3 The moving contact 14 includes a connecting portion 141 and conductive portions 142 disposed at both ends of the connecting portion 141. The connecting portion 141 is rotatably disposed in the housing 1. When it is necessary to disconnect or connect the circuit, the connecting portion 141 can rotate flexibly in the housing 1, and the conductive portions 142 are used to electrically connect with the stationary contact 15 to realize the conduction of the circuit.

[0044] Reference Figure 2 and Figure 3 Each stationary contact 15 is located at one end of the moving contact 14, ensuring that the conductive part 142 can accurately contact or separate from the stationary contact 15 during the rotation of the moving contact 14. Each connecting part 141 is provided with a rotating post 143, and each rotating post 143 is provided with a connecting rod 144. Multiple connecting rods 144 are evenly arranged around the rotating post 143, and the active plate 12 is arranged on the connecting rod 144.

[0045] Reference Figure 2 , Figure 3 and Figure 4 Each connecting rod 144 is provided with a fixing plate 145, and a driving arm 146 is rotatably mounted on one of the connecting rods 144. The transmission assembly 32 can drive the driving arm 146 to rotate, and the rotation of the driving arm 146 drives the connecting rod 144 and the rotating column 143 to move, thereby causing the moving contact 14 to rotate, realizing the separation and engagement of the moving contact 14 and the stationary contact 15.

[0046] Reference Figure 2 The connecting rod 144 extends into the sliding hole 121 of the active plate 12, and the diameter of the sliding hole 121 is larger than the diameter of the connecting rod 144. This design creates a certain gap between the active plate 12 and the connecting rod 144, allowing the active plate 12 to adapt to the movement of the connecting rod 144 under different working conditions, thus ensuring the stability and reliability of the entire indicating system.

[0047] Reference Figure 1 and Figure 2 When the connecting rod 144 moves in the direction of opening, the driving plate 12 moves accordingly, and then the driven plate 13 is pushed, which in turn pushes the indicator block 2 to rotate. When the moving contact 14 closes, the movement of the connecting rod 144 causes the driving plate 12 to move downward, and the driven plate 13 moves downward under its own gravity. Since the axis of rotation of the indicator block 2 is not at the center of gravity, when the driven plate 13 does not push the indicator block 2 to rotate, the indicator block 2 will also rotate in the direction of closing under its own gravity, so that the closing indicator 21 is aligned with the observation window 11, showing the closing status.

[0048] Reference Figure 2 , Figure 3 and Figure 4 The drive arm 146 has a mounting rod 147 at the end away from the connecting rod 144. A triangular plate 148 is fixedly mounted on the mounting rod 147. A trigger plate 16 and a handle bracket 17 are rotatably mounted in the housing 1. The rotation direction of the handle bracket 17 is the same as the rotation direction of the indicator block 2. The handle bracket 17 is used to drive the handle to rotate in the direction of closing or opening. The trigger plate 16 is rotatably mounted on the side of the handle bracket 17 close to the mounting rod 147. The trigger plate 16 abuts against the handle bracket 17.

[0049] Reference Figure 3 and Figure 4 One end of the triangular plate 148 is rotatably connected to the trigger plate 16. The hinge point of the handle bracket 17 is located on the side of the mounting rod 147 away from the trigger plate 16. The mounting rod 147 is provided with a tripping spring 149. The end of the tripping spring 149 away from the mounting rod 147 is connected to the handle bracket 17. The tripping spring 149 is used to drive the handle bracket 17 to rotate in the direction of tripping. The transmission assembly 32 can limit the trigger plate 16 to the closed position.

[0050] Reference Figure 4The mounting rod 147 can be cylindrical and is fixed to the drive arm 146 via a threaded connection or other means to ensure a secure connection. The triangular plate 148 can be an equilateral triangle, with its apex fixedly connected to the mounting rod 147, another angle rotatably connected to the trigger plate 16, and the third angle being a free end. The trigger plate 16 is rotatably connected to the housing 1 via a shaft, allowing it to rotate freely around the shaft. The handle bracket 17 is also rotatably connected to the housing 1 via a shaft and is connected to the handle via integral molding or other means.

[0051] Reference Figure 3 and Figure 4 When the transmission assembly 32 limits the trigger plate 16 to the closed position, the opening spring 149 is in a stretched state, storing elastic potential energy. When the transmission assembly 32 releases the limit on the trigger plate 16, the opening spring 149 releases its elastic potential energy, causing the handle bracket 17 to rotate in the opening direction. At the same time, the drive arm 146 rotates through the triangular plate 148 and the mounting rod 147, thereby causing the moving contact 14 to separate from the stationary contact 15, realizing the opening action, making the opening action faster and more reliable.

[0052] Reference Figure 2 and Figure 4 The transmission assembly 32 includes a limiting block 321 rotatably disposed in the housing 1, a reset plate 322 rotatably disposed in the housing 1, and a drive rod 323 disposed on the electromagnetic trip coil 31. The reset plate 322 is used to limit the trigger plate 16 to the closed position. The reset plate 322 is disposed on one side of the trigger plate 16. The reset plate 322 includes a limiting part 324 and an abutting part 325. The limiting part 324 is rotatably disposed in the housing 1, and the abutting part 325 abuts against the limiting block 321.

[0053] Reference Figure 4 and Figure 5 The limiting part 324 has a limiting groove 326, and the trigger plate 16 has a stop block 161. When the trigger plate 16 is in the closed position, the stop block 161 on the trigger plate 16 extends into the limiting groove 326, and the groove wall of the limiting groove 326 can prevent the stop block 161 from moving. The reset plate 322 has a reset torsion spring 327 on its rotating shaft, and the reset torsion spring 327 has a tendency to drive the reset plate 322 away from the trigger plate 16.

[0054] Reference Figure 3 , Figure 4 and Figure 5 The limiting block 321 is located on the side of the reset plate 322 away from the trigger plate 16. The limiting block 321 can prevent the reset plate 322 from rotating away from the trigger plate 16. The drive rod 323 can drive the limiting block 321 to rotate. A limiting torsion spring (not shown in the figure) is provided on the rotating shaft of the limiting block 321. The limiting torsion spring is used to fix the limiting block 321 at the position that limits the reset plate 322.

[0055] Reference Figure 3 , Figure 4 and Figure 5 The limiting block 321 includes a rotating part 33, a stop part 331 disposed on the rotating part 33, and a transmission part 332 connected to the drive rod 323. The rotating part 33 is rotatably disposed in the housing 1. The stop part 331 is provided with a limiting inclined surface 333 and a guiding arc surface 334. When the reset plate 322 is in the closed position, the limiting inclined surface 333 abuts against the abutting part 325 of the reset plate 322, and the guiding arc surface 334 is used to guide the reset plate 322 to rotate towards the trigger plate 16. The transmission part 332 is connected to the rotating part 33, and a connecting hole 335 is provided on the transmission part 332, and one end of the drive rod 323 extends into the connecting hole 335.

[0056] Reference Figure 5 and Figure 6 The limiting part 324 is typically a plate-shaped structure with a shaft hole in the middle, rotatably connected to the outer casing 1 via a shaft. The abutment part 325 can also be a plate-shaped structure, integrally formed with the limiting part 324, and is used to contact the limiting block 321. When the trigger plate 16 rotates to the closed position, the stop block 161 on the trigger plate 16 extends into the limiting groove 326 of the limiting part 324. The groove wall of the limiting groove 326 prevents the stop block 161 from moving, thereby fixing the trigger plate 16 in the closed position. When the reset plate 322 rotates under the action of the reset torsion spring 327, the limiting groove 326 separates from the stop block 161, the trigger plate 16 loses its limiting position, and the opening action is realized.

[0057] Reference Figure 5 and Figure 6 The rotating part 33 is typically cylindrical with a central shaft hole, and is rotatably connected to the outer casing 1 via a shaft. The stopping part 331 can be a block structure, integrally formed with the rotating part 33. The limiting inclined surface 333 and the guiding arc surface 334 are special shapes on the surface of the stopping part 331, used to mate with the abutment part 325. The limiting inclined surface 333 contacts the side of the reset plate 322, serving a limiting function.

[0058] Reference Figure 3 and Figure 4 The drive rod 323 can be a rod-shaped structure connected to the iron core of the electromagnetic trip coil 31. When the electromagnetic trip coil 31 is energized and generates magnetic force, the drive rod 323 will move together with the iron core. The limit torsion spring is set on the rotating shaft of the limit block 321 to keep the limit block 321 in the closed position and limit the reset plate 322.

[0059] The implementation principle of a residual current protection circuit breaker according to an embodiment of this application is as follows: By adopting a design with multiple sets of moving contacts 14 and stationary contacts 15, the circuit breaking capacity is increased, and the protection performance of the circuit breaker is improved. When a circuit fault occurs, the electromagnetic trip coil 31 is energized, and the drive rod 323 drives the limit block 321 to rotate, releasing the limit on the reset plate 322. Under the action of the reset torsion spring 327, the reset plate 322 moves away from the trigger plate 16, and the trigger plate 16 loses its limit. Under the action of the opening spring 149, the handle bracket 17 rotates in the opening direction, causing the moving contact 14 to separate from the stationary contact 15. This improves the breaking speed and stability of the circuit breaker, reduces the problem of jamming of the transmission component 32, and enhances the protection effect and reliability of the circuit breaker.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A residual current protection circuit breaker, comprising a housing (1), a moving contact (14) and a stationary contact (15) disposed in the housing (1), and a tripping mechanism (3) disposed in the housing (1), wherein the tripping mechanism (3) comprises an electromagnetic tripping coil (31) and a transmission assembly (32), characterized in that: Multiple sets of moving contacts (14) and stationary contacts (15) are provided. The moving contact (14) includes a connecting part (141) and conductive parts (142) provided at both ends of the connecting part (141). The connecting part (141) is rotatably disposed in the housing (1). The conductive parts (142) are used to electrically connect with the stationary contacts (15). The stationary contacts (15) are provided at both ends of the moving contact (14). Each connecting part (141) is provided with a rotating column (143). Each rotating column (143) is provided with a connecting rod (144). A driving arm (146) is rotatably disposed on the connecting rod (144). The transmission assembly (32) can drive the driving arm (146) to rotate. The drive arm (146) has a mounting rod (147) at one end away from the connecting rod (144). A triangular plate (148) is mounted on the mounting rod (147). A trigger plate (16) and a handle bracket (17) are rotatably disposed within the housing (1). The handle bracket (17) is used to drive the handle to rotate in the direction of closing or opening the circuit breaker. The trigger plate (16) is rotatably disposed on the side of the handle bracket (17) near the mounting rod (147). The trigger plate (16) abuts against the handle bracket (17). One end of the triangular plate (148) is rotatably connected to the trigger plate (16). The hinge point of the handle bracket (17) is located on the side of the mounting rod (147) away from the trigger plate (16). The mounting rod (147) is provided with a tripping spring (149). One end of the tripping spring (149) is connected to the handle bracket (17). The tripping spring (149) is used to drive the handle bracket (17) to rotate in the direction of tripping. The transmission assembly (32) can limit the trigger plate (16) to the closed position.

2. A residual current protection circuit breaker according to claim 1, characterized in that: Multiple connecting rods (144) are evenly arranged around the rotating column (143), and a fixing plate (145) is provided on each connecting rod (144). The driving arm (146) is rotatably mounted on one of the connecting rods (144).

3. A residual current protection circuit breaker according to claim 1, characterized in that: The transmission assembly (32) includes a limiting block (321) rotatably disposed in the housing (1), a reset plate (322) rotatably disposed in the housing (1), and a drive rod (323) disposed on the electromagnetic trip coil (31). The reset plate (322) is used to limit the trigger plate (16) to the closed position. A reset torsion spring (327) is provided on the rotating shaft of the reset plate (322). The reset torsion spring (327) has the function of driving the reset plate (322) away from the trigger plate (16). The trend of 16) is such that the limiting block (321) is located on the side of the reset plate (322) away from the trigger plate (16). The limiting block (321) can prevent the reset plate (322) from rotating away from the trigger plate (16). The driving rod (323) can drive the limiting block (321) to rotate. The limiting block (321) is provided with a limiting torsion spring on its rotating shaft. The limiting torsion spring is used to fix the limiting block (321) at the position that limits the reset plate (322).

4. A residual current protection circuit breaker according to claim 3, characterized in that: The reset plate (322) is disposed on one side of the trigger plate (16). The reset plate (322) includes a limiting part (324) and an abutting part (325). The limiting part (324) is rotatably disposed in the outer shell (1). The abutting part (325) abuts against the limiting block (321). A limiting groove (326) is provided on the limiting part (324). A stop block (161) is provided on the trigger plate (16). When the trigger plate (16) is in the closed position, the stop block (161) extends into the limiting groove (326). The groove wall of the limiting groove (326) can prevent the stop block (161) from moving.

5. A residual current protection circuit breaker according to claim 3, characterized in that: The limiting block (321) includes a rotating part (33), a stop part (331) disposed on the rotating part (33), and a transmission part (332) connected to the drive rod (323). The rotating part (33) is rotatably disposed in the outer shell (1). The stop part (331) is provided with a limiting inclined surface (333) and a guiding arc surface (334). When the reset plate (322) is in the closed position, the limiting inclined surface (333) abuts against the reset plate (322), and the guiding arc surface (334) is used to guide the reset plate (322) to rotate towards the trigger plate (16).

6. A residual current protection circuit breaker according to claim 5, characterized in that: The transmission part (332) is connected to the rotating part (33), and the transmission part (332) has a connecting hole (335), one end of the drive rod (323) extends into the connecting hole (335).

7. A residual current protection circuit breaker according to claim 1, characterized in that: An indicator block (2) is rotatably disposed in the outer casing (1). The indicator block (2) is provided with a closing indicator (21) and a closing indicator (22). The rotation direction of the indicator block (2) is consistent with the rotation direction of the handle bracket (17). The closing indicator (21) and the closing indicator (22) are arranged along the rotation direction of the indicator block (2). An observation window (11) is provided on the outer casing (1). The indicator block (2) is disposed at the observation window (11). An active plate (12) and a driven plate (13) are slidably disposed in the outer casing (1). The active plate (12) is disposed on the connecting rod (144). One end of the driven plate (13) abuts against the active plate (12) and the other end abuts against the indicator block (2). When the moving contact (14) is activated, the driven plate (13) can push the indicator block (2) to rotate.

8. A residual current protection circuit breaker according to claim 7, characterized in that: The active plate (12) has a sliding hole (121) and the connecting rod (144) extends into the sliding hole (121). The diameter of the sliding hole (121) is larger than the diameter of the connecting rod (144).

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