A mechanical interlock device for preventing mis-tripping of a circuit breaker

Abstract

The application discloses a mechanical interlocking device for preventing mis-tripping of a circuit breaker, which comprises a shell, a trigger component arranged on the shell, a lock rod, one end of which is connected with the trigger component and the other end of which is movably connected with an interlocking plate, an adjusting screw rod arranged in a nut, the nut being fixed on the outside of the shell, a circuit breaker auxiliary switch connecting plate in gap cooperation with one end of the adjusting screw rod close to the lock rod, a tripping electromagnet arranged in a circuit breaker tripping control circuit in the shell and cooperating with the interlocking plate, a sliding groove guide plate fixed in the shell, the interlocking plate being slidably connected in the sliding groove guide plate, a micro switch arranged in the shell and located above the sliding groove guide plate and movably connected with the interlocking plate, and a reset unit, one end of which is connected with the top of the shell and the other end of which is connected with the interlocking plate. Mechanical locking is realized by cooperation of the interlocking plate and the tripping electromagnet, and the mechanical path of accidental tripping of the circuit breaker is blocked. On the other hand, the movable connection of the interlocking plate and the micro switch constitutes electrical locking, so that the synergistic effect of double locking is realized.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment technology, and specifically relates to a mechanical interlocking device to prevent circuit breakers from tripping erroneously. Background Technology

[0002] In the power distribution process of power systems, gas-insulated switchgear is widely used in various industrial sites and power distribution networks due to its advantages such as small size, high safety and strong adaptability to harsh environments. In the current mainstream structural layout of gas-insulated switchgear, the circuit breaker outgoing side is usually not equipped with an independent grounding switch, which has become the common structural design form for this type of equipment. Based on the above structural characteristics, in order to ensure reliable grounding on the line side and guarantee maintenance safety during the maintenance of gas-insulated switchgear, the existing technology generally adopts the operation method of "grounding the three-position isolating switch at the upper end of the circuit breaker before closing the circuit breaker". This method is the main technical means to achieve line-side grounding protection for gas-insulated switchgear without a grounding switch on the outgoing line side, and it is widely used, especially in gas-insulated switchgear equipment equipped with ZN92 circuit breakers. However, the existing technical solution of "grounding the line side by closing the circuit breaker" has significant drawbacks: when the circuit breaker is in the closed grounded state, there is a lack of an effective mechanism to prevent accidental tripping, leading to the risk of accidental tripping. Once the circuit breaker trips unexpectedly, it will directly cause the grounding circuit to break, which will not only interrupt the normal progress of maintenance work and seriously affect the maintenance efficiency of the power system, but also cause maintenance personnel and equipment to lose grounding protection, which can easily lead to serious safety accidents such as electric shock and equipment damage, posing a great threat to the personal safety of maintenance personnel and the stable operation of power equipment. Summary of the Invention This invention provides a mechanical interlocking device to prevent circuit breaker misoperation, which addresses the following shortcomings in the prior art: firstly, it cannot effectively prevent accidental tripping of the circuit breaker when the line side is grounded after being grounded by the upper three-position isolating switch; secondly, it lacks a technical solution that can balance safety and practicality, making it difficult to achieve protection against accidental tripping while ensuring that the circuit breaker's opening and closing operations are not affected after the interlock is released.

[0003] To achieve the above objectives, the present invention employs the following technical solution: A mechanical interlocking device for preventing circuit breaker from tripping accidentally includes: The housing has a triggering component on it; The locking rod is connected at one end to the triggering component and at the other end to the interlocking plate. An adjusting screw is located in a nut, and the nut is fixed to the outside of the housing; The circuit breaker auxiliary switch connecting plate is clearance-fitted with the end of the adjusting screw near the locking rod; The tripping electromagnet is installed in the circuit breaker tripping control circuit inside the housing and works in conjunction with the interlocking plate. A sliding guide plate is fixedly installed in the housing, and the interlocking plate is slidably connected in the sliding guide plate; The micro switch is located inside the housing and above the slide guide plate, and is movably connected to the interlock plate; The reset unit is connected to the top of the housing at one end and to the interlocking plate at the other end.

[0004] Furthermore, the triggering component is connected to the locking rod via a locking cylinder mechanism; The triggering component is a key.

[0005] Furthermore, the locking rod has a cylindrical structure.

[0006] Furthermore, the adjusting screw is located on one side of the circuit breaker auxiliary switch plate.

[0007] Furthermore, the circuit breaker auxiliary switch connecting plate is a sheet-like structure located above the interlocking plate; The circuit breaker auxiliary switch connecting plate is connected to the circuit breaker opening and closing mechanism at one end near the adjusting screw via a fixed shaft, and the fixed shaft is rotatably connected to the housing. Under the drive of the circuit breaker opening and closing mechanism, the circuit breaker auxiliary switch connecting plate blocks or releases the interlocking plate.

[0008] Furthermore, the interlocking plate includes a pressing end, a locking end, and a reset end. The pressing end is movably connected to a micro switch, the locking end is movably connected to a tripping electromagnet, and the reset end is movably connected to a reset unit.

[0009] Furthermore, the reset unit is a reset spring.

[0010] Furthermore, the guide plate has a groove, and the interlocking plate is slidably connected in the groove.

[0011] Furthermore, the micro switch is connected in series with a trip coil electrical circuit.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. Mechanical locking is achieved through the cooperation of the interlocking plate and the tripping electromagnet, directly restricting the action of the tripping electromagnet at the physical level and blocking the mechanical path of accidental tripping of the circuit breaker. On the other hand, the movable connection between the interlocking plate and the micro switch constitutes electrical locking. When the interlocking is activated, the micro switch disconnects the circuit breaker tripping coil circuit, cutting off the transmission of the tripping command at the electrical control level, thereby achieving the synergistic effect of dual locking. This completely solves the core defect of the existing technology of "solely relying on the circuit breaker closing to achieve grounding, without protection against accidental tripping", minimizing the risk of safety accidents such as electric shock and equipment damage caused by grounding circuit breakage, and providing double insurance for the personal safety of maintenance personnel and the stability of power equipment.

[0013] 2. The key, as a dedicated triggering component, forms a unique matching relationship with the lock cylinder mechanism and the lock bar. This ensures that only authorized personnel with the corresponding key can turn the key to drive the lock cylinder mechanism and move the lock bar, thereby activating or deactivating the interlocking device. This completely eliminates the risk of interlocking failure or malfunction caused by unauthorized personnel accidentally touching or operating the device. Compared to designs without access control, this significantly improves the security and controllability of the device operation.

[0014] 3. The cylindrical structure has a uniform surface curvature. When the locking bar is driven by the lock cylinder mechanism to perform axial pushing and pulling action, it has line contact or point contact with the contacting parts. Compared with non-cylindrical structures such as square and polygonal structures, the contact area is smaller and the frictional resistance is significantly reduced.

[0015] 4. The lateral alignment of the adjusting screw and the circuit breaker auxiliary switch connecting plate enables them to form a direct action connection.

[0016] 5. The circuit breaker auxiliary switch connecting plate adopts a sheet structure, which has significant advantages of light weight and low inertia. When the circuit breaker opening and closing mechanism drives the connecting plate to rotate through the fixed shaft, the sheet structure can quickly respond to the driving action, effectively reducing the action delay caused by its own excessive weight, and ensuring that the triggering action of the adjusting screw or the blocking or releasing action of the interlocking plate is accurately synchronized with the opening and closing state of the circuit breaker.

[0017] 6. The three-section functional division of the interlocking plate enables a single component to simultaneously carry out the three core functions of electrical locking triggering, mechanical locking execution, and automatic reset connection, and the functions do not interfere with each other and work together. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A front view of a mechanical interlocking device for preventing circuit breaker erroneous tripping provided by the present invention; Figure 2 A side view of a mechanical interlocking device for preventing circuit breaker erroneous tripping provided by the present invention; The components are: 1. Key; 2. Locking rod; 3. Adjusting screw; 4. Nut; 5. Circuit breaker auxiliary switch connecting plate; 6. Tripping electromagnet; 7. Slide guide plate; 8. Interlocking plate; 9. Micro switch; 10. Return spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: See Figures 1-2 This invention provides a mechanical interlocking device to prevent circuit breaker erroneous tripping, comprising a housing with a triggering component thereon; a locking rod 2, one end of which is connected to the triggering component and the other end of which is movably connected to an interlocking plate 8; an adjusting screw 3, which is disposed in a nut 4, and the nut 4 is fixed to the outside of the housing; a circuit breaker auxiliary switch connecting plate 5, which is clearance-fitted with the end of the adjusting screw 3 near the locking rod 2; a tripping electromagnet 6, which is disposed in the circuit breaker tripping control circuit inside the housing and cooperates with the interlocking plate 8; a sliding guide plate 7, which is fixed in the housing, and the interlocking plate 8 is slidably connected to the sliding guide plate 7; a micro switch 9, which is disposed inside the housing and located above the sliding guide plate 7, and is movably connected to the interlocking plate 8; and a reset unit, one end of which is connected to the top of the housing and the other end of which is connected to the interlocking plate 8.

[0027] In the above structure, on the one hand, mechanical locking is achieved through the cooperation of the interlocking plate 8 and the tripping electromagnet 6, directly restricting the action of the tripping electromagnet 6 from the physical level and blocking the mechanical path of accidental tripping of the circuit breaker; on the other hand, the movable connection between the interlocking plate 8 and the micro switch 9 constitutes electrical locking. When the interlock is activated, the micro switch 9 disconnects the circuit breaker tripping coil circuit, cutting off the transmission of the tripping command from the electrical control level, thereby achieving the synergistic effect of dual locking. This completely solves the core defect of the existing technology of "single reliance on circuit breaker closing to achieve grounding, without protection against accidental tripping", minimizing the risk of safety accidents such as electric shock and equipment damage caused by grounding circuit breakage, and providing double insurance for the personal safety of maintenance personnel and the stability of power equipment.

[0028] The reset unit is designed so that when the interlock is released, the reset unit drives the interlock plate 8 to slide and reset along the guide plate 7 using its own elasticity. This simultaneously releases the mechanical lock on the trip electromagnet 6 and the trigger state of the micro switch 9, allowing the circuit breaker trip control circuit to automatically return to normal. The entire process requires no additional manual operation, which not only simplifies the process but also avoids circuit breaker malfunctions caused by untimely or incomplete reset. This significantly improves the stability and ease of maintenance of the device, ensuring the reliability of the equipment when switching between protection and normal operating conditions. Furthermore, the triggering component is connected to the locking rod 2 via the lock cylinder mechanism. The triggering component is key 1, which serves as a dedicated triggering component. Through the lock cylinder mechanism, key 1 forms a unique matching relationship with the locking rod 2, ensuring that only authorized personnel holding the corresponding key 1 can drive the lock cylinder mechanism to move the locking rod 2 by turning key 1, thereby activating or deactivating the interlocking device. This access control design completely eliminates the risk of interlocking failure or malfunction due to unauthorized personnel accidentally touching or operating the device. Compared to designs without access control, it improves the safety and controllability of device operation, and is particularly suitable for maintenance scenarios involving multiple personnel working together in power systems. In practice, the locking rod 2 has a cylindrical structure. On the one hand, the cylindrical structure has a uniform surface curvature. When the locking rod 2 is driven by the lock cylinder mechanism to perform axial pushing and pulling movements, it forms line contact or point contact with other components. Compared with non-cylindrical structures such as square and polygonal structures, the cylindrical structure has a smaller contact area and significantly reduced frictional resistance. This makes it easier and smoother for authorized personnel to operate the locking rod 2 by turning the lock cylinder mechanism with the key 1, effectively avoiding the problem of operation jamming caused by excessive frictional resistance. At the same time, the low-friction transmission characteristics reduce power loss and ensure that the driving force of the lock cylinder mechanism can be efficiently transmitted to the interlocking plate 8, ensuring rapid response of interlocking start and release actions, and improving the operating efficiency and reliability of the device.

[0029] Furthermore, the adjusting screw 3 is located on one side of the circuit breaker auxiliary switch connecting plate 5, which is a sheet structure located above the interlocking plate 8; the end of the circuit breaker auxiliary switch connecting plate 5 near the adjusting screw 3 is connected to the circuit breaker opening and closing mechanism via a fixed shaft, which is rotatably connected to the housing. Driven by the circuit breaker's opening and closing mechanism, the circuit breaker's auxiliary switch connecting plate 5 blocks or releases the interlocking plate 8.

[0030] Because the circuit breaker auxiliary switch plate 5 adopts a sheet structure, it has significant advantages in terms of light weight and low inertia. When the circuit breaker opening and closing mechanism drives the circuit breaker auxiliary switch plate 5 to rotate through the fixed shaft, the circuit breaker auxiliary switch plate 5 can quickly respond to the driving action, ensuring that the triggering action of the adjusting screw 3 or the blocking / releasing action of the interlocking plate 8 is precisely synchronized with the opening and closing state of the circuit breaker.

[0031] In addition, the circuit breaker auxiliary switch plate 5 is placed above the interlocking plate 8, making full use of the vertical space inside the housing. It forms a layered layout with the interlocking plate 8, micro switch 9 and slide guide plate 7 below, effectively avoiding spatial conflicts between the components during operation. This makes the internal structure of the entire device more compact and the layout more reasonable, adapting to the narrow installation space inside the gas-filled cabinet.

[0032] The interlocking plate 8 includes a pressing end, a locking end, and a reset end. The pressing end is movably connected to the micro switch 9, the locking end is movably connected to the trip electromagnet 6, and the reset end is movably connected to the reset unit; specifically, the reset unit is a reset spring 10.

[0033] In the above structure, the three-section functional division of the interlocking plate 8 allows a single component to simultaneously bear the three core functions of electrical locking triggering, mechanical locking execution, and automatic reset connection, with each function operating independently and in synergy. The cooperation between the pressing end and the micro switch 9 enables precise pressing to control the on / off state of the electrical circuit of the trip coil. The engagement and disengagement of the locking end and the trip electromagnet 6 complete the mechanical trip restriction. The force transmission between the reset end and the reset unit ensures reliable reset after the interlock is released, improving the coordination and accuracy of the overall device operation and meeting the core protection requirement of "dual locking". In this scheme, the guide plate 7 has a groove, the interlocking plate 8 is slidably connected in the groove, and the micro switch 9 has a trip coil electrical circuit connected in series.

[0034] The mechanical interlocking device for preventing accidental tripping can be implemented in three stages: initial state, interlocking activation state, and interlocking deactivation state. In the initial state, the circuit breaker is in the open position. The circuit breaker auxiliary switch plate 5 rotates above the interlocking plate 8 with the tripping action, forming a physical block and restricting the upward sliding of the interlocking plate 8. At this time, the micro switch 9 is not pressed, the trigger spring is in the initial state, and the electrical circuit of the tripping coil remains conductive, which does not affect the subsequent closing operation of the circuit breaker. At the same time, the tripping electromagnet 6 button is not locked and can be pressed normally. The key 1 cannot be removed, avoiding accidental activation of the interlocking in the open state and ensuring that the device is in a standby state that does not interfere with normal closing.

[0035] When the interlocking is activated, the prerequisites are first confirmed. The circuit breaker is then operated to close the circuit. The circuit breaker auxiliary switch connecting plate 5 rotates with the closing action, releasing the obstruction to the interlocking plate 8 (the gap between the adjusting screw 3 and the nut 4 has been pre-adjusted to ensure that the circuit breaker auxiliary switch connecting plate 5 can be completely moved without obstruction when the circuit is closed only). Then, the key 1 is turned, which drives the locking rod 2 to extend horizontally through the lock cylinder mechanism. The locking rod 2 pushes the interlocking plate 8 to slide upward along the inner groove of the slide guide plate 7. The slide guide plate 7 restricts the sliding direction of the interlocking plate 8 to prevent it from deviating.

[0036] When the interlock plate 8 moves up to the designated position, its lower end is inserted into the bottom of the button of the trip electromagnet 6, pressing the button so that it cannot be pressed, cutting off the mechanical trip circuit, and directly preventing the circuit breaker from tripping by mechanical operation; during the upward movement of the interlock plate 8, the trigger spring of the micro switch 9 is pressed simultaneously, the state of the micro switch 9 is switched, cutting off the electrical circuit of the trip coil, so even if an electrical trip signal is received, the circuit breaker cannot perform the tripping action.

[0037] Once the interlock is in place, key 1 can be removed. At this time, the device remains in a double-locked state, and the circuit breaker is reliably fixed in the closed position, ensuring the stability of the line-side grounding circuit and meeting the maintenance safety requirements.

[0038] In the disengaged state, key 1 is reinserted into the lock cylinder and rotated in the opposite direction, causing the locking rod 2 to retract horizontally, releasing the thrust on the interlocking plate 8. The reset spring 10 releases its elastic potential energy, pulling the interlocking plate 8 down along the guide plate 7 and disengaging it from the bottom of the button on the tripping electromagnet 6. Simultaneously, the interlocking plate 8 separates from the trigger spring of the micro switch 9, the trigger spring of the micro switch 9 automatically resets, the electrical circuit of the tripping coil is reconnected, and the electrical tripping function is restored. The button on the tripping electromagnet 6 can be pressed normally, and the mechanical tripping circuit is restored.

[0039] When the circuit breaker is operated to complete the tripping action, the auxiliary switch plate 5 of the circuit breaker rotates with the tripping action and returns to the top of the interlock plate 8 to form a block, restricting the upward movement of the interlock plate 8. The key 1 cannot be removed, and the device returns to the initial standby state, waiting for the next interlocking activation.

[0040] It is worth noting that when the circuit breaker is closed and the interlocking is activated, the interlocking plate 8 moves upward along the guide plate 7. On the one hand, it directly inserts into the bottom of the trip electromagnet 6 button, locking the trip button mechanically and cutting off the "mechanical trip circuit". On the other hand, during the upward movement of the interlocking plate 8, the micro switch 9 is pressed simultaneously to switch its state and cut off the "trip coil electrical circuit". This design covers the two core paths of circuit breaker tripping (mechanical operation and electrical drive), forming double protection, completely avoiding accidental tripping, ensuring the continuous conduction of the line-side grounding circuit, and fundamentally eliminating the safety hazards of maintenance work.

[0041] In addition, the circuit breaker auxiliary switch connecting plate 5 is rigidly linked to the circuit breaker's opening and closing states; when the circuit breaker is open, the circuit breaker auxiliary switch connecting plate 5 is in the blocking position, directly restricting the interlocking plate 8 from moving upward, ensuring that the interlocking is not activated and does not affect the normal closing of the circuit breaker.

[0042] When the circuit breaker closes, the auxiliary switch connecting plate 5 of the circuit breaker is released from obstruction in conjunction with the circuit breaker status. Simultaneously, the adjusting screw 3 can be precisely adjusted with the nut 4 to precisely adjust the gap between itself and the auxiliary switch connecting plate 5, further ensuring that the interlocking plate 8 can only smoothly move upwards to activate the interlock when the circuit breaker is fully closed. This achieves precise binding between the interlock and the circuit breaker status, preventing accidental activation of the interlock during opening and ensuring reliable interlock effectiveness during closing, without interfering with the normal operating logic of the circuit breaker. Furthermore, the sliding guide plate 7 forms a precise fit with the interlocking plate 8 through its inner groove, providing a track-like guide for the up-and-down movement of the interlocking plate 8. This effectively prevents the interlocking plate 8 from shifting left or right, getting stuck, or tilting during movement, ensuring that the interlocking plate 8 can accurately insert into the bottom of the opening electromagnet 6 button and precisely press the microswitch 9. This avoids interlock failures due to deviations in action, such as mechanical failure to lock or electrical failure to disconnect, significantly improving the operational reliability of the device.

[0043] When the key 1 is rotated in the reverse direction to release the interlock, the reset spring 10 pulls the interlock plate 8 downward along the guide plate 7 by the pre-stored elastic force. On the one hand, it releases the lock on the trip electromagnet 6 and restores the mechanical trip circuit; on the other hand, it drives the micro switch 9 to reset and restore the electrical circuit of the trip coil. The entire reset process does not require additional manual operation and the reset force is stable, ensuring that the circuit breaker can immediately restore the normal trip function after the interlock is released, avoiding component jamming that affects subsequent power operation.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mechanical interlocking device for preventing circuit breaker from tripping erroneously, characterized in that, include: The housing has a triggering component on it; The locking rod is connected at one end to the triggering component and at the other end to the interlocking plate. An adjusting screw is located in a nut, and the nut is fixed to the outside of the housing; The circuit breaker auxiliary switch connecting plate is clearance-fitted with the end of the adjusting screw near the locking rod; the circuit breaker auxiliary switch connecting plate is a sheet structure located above the interlocking plate; the end of the circuit breaker auxiliary switch connecting plate near the adjusting screw is connected to the circuit breaker opening and closing mechanism via a fixed shaft, and the fixed shaft is rotatably connected to the housing; Among them, under the drive of the circuit breaker opening and closing mechanism, the circuit breaker auxiliary switch connecting plate blocks or releases the interlocking plate. The tripping electromagnet is installed in the circuit breaker tripping control circuit inside the housing and works in conjunction with the interlocking plate. A sliding guide plate is fixed in the housing, and a groove is formed on the sliding guide plate. The interlocking plate is slidably connected in the groove of the sliding guide plate. The interlocking plate includes a pressing end, a locking end, and a reset end. The pressing end is movably connected to a micro switch, the locking end is movably connected to a trip electromagnet, and the reset end is movably connected to a reset unit. The micro switch is located inside the housing and above the slide guide plate, and is movably connected to the interlock plate; The reset unit is connected to the top of the housing at one end and to the reset end of the interlocking plate at the other end.

2. The mechanical interlocking device for preventing circuit breaker misoperation according to claim 1, characterized in that, The triggering component is connected to the locking rod via a locking cylinder mechanism; The triggering component is a key.

3. The mechanical interlocking device for preventing circuit breaker misoperation according to claim 2, characterized in that, The locking rod has a cylindrical structure.

4. The mechanical interlocking device for preventing circuit breaker misoperation according to claim 1, characterized in that, The adjusting screw is located on one side of the circuit breaker auxiliary switch plate.

5. A mechanical interlocking device for preventing circuit breaker misoperation according to claim 1, characterized in that, The reset unit is a reset spring.

6. The mechanical interlocking device for preventing circuit breaker misoperation according to claim 1, characterized in that, The micro switch has a trip coil electrical circuit connected in series.

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