CN209947769U - Over-voltage and under-voltage protection mechanism with holding function - Google Patents

Abstract

The utility model relates to a cross undervoltage protection mechanism with retention function, including casing, execution unit, power pack and the control unit, the control unit receives external signal, and the power pack includes base, electromagnetic component and spacing subassembly, and spacing subassembly includes setting element, driving piece and rotating member, sets up work high level and work low level on the setting element, and electromagnetic component makes the driving piece move, and driving piece drive rotating member rotates in the setting element and stops at work high level or work low level and fixes a position; the rotating piece is positioned at a working high position, and the execution unit limits the closing of the breaker; the rotating piece is located at a working low position, and the closing of the circuit breaker is not limited. By adopting the protection mechanism, the mechanical structure is adopted for limiting under the condition of limiting the switching-on working state of the circuit breaker, the electromagnetic assembly is not electrified, and the electromagnetic assembly is electrified to work only under the transition state that the working state is converted into the non-working state and the non-working state is converted into the working state, so that the stability of the working state of the mechanism is improved.

Description

Over-voltage and under-voltage protection mechanism with holding function

Technical Field

The utility model relates to a protective equipment in the low pressure power consumption field especially relates to an under-voltage protection mechanism crosses with retention function.

Background

A circuit breaker is a switching device for making or breaking an electric circuit, and plays a role in protection and control in an electric power system; when a power system has a fault, the circuit breaker can execute a disconnection operation, and meanwhile, a protection mechanism is needed to ensure that the circuit breaker cannot perform a closing operation when the power system has the fault; at present, this kind of protection machanism adopts the electro-magnet to control more, accomplishes the restriction that protection machanism operating condition's transformation realized closing to the circuit breaker through circular telegram or outage, and in the in-service use process, to this operating condition of restriction closing, it keeps to need the electro-magnet to last circular telegram, and the voltage input that the electro-magnet received is very unstable simultaneously, causes the harm to the electro-magnet very easily, can reduce electro-magnet life like this, and operating condition will receive the influence of electro-magnet, takes place the incident very easily.

Disclosure of Invention

The utility model aims to solve the technical problem that a too undervoltage protection mechanism that has a retention function that reduces the influence of electro-magnet and also can restrict switching-on operation simultaneously when not circular telegram is provided.

The utility model provides a technical scheme that its technical problem adopted is: an overvoltage and undervoltage protection mechanism with a holding function is installed on a circuit breaker and comprises a shell, an execution unit arranged in the shell, a power unit driving the execution unit to move and a control unit used for controlling the power unit, wherein the control unit receives an external signal; when the rotating piece is positioned at the working high position, the execution unit limits the circuit breaker to be switched on; when the rotating piece is located at a working low position, the closing of the circuit breaker is not limited.

More specifically, the positioning element is fixed on the base, the positioning element is provided with at least one working high position and at least one working low position, and a fixed inclined plane for driving the rotating element to rotate is arranged between the working high position and the working low position; and a limiting groove is arranged at the working low position.

Further specifically, the driving piece comprises a driving body, spline teeth arranged at the top of the driving body and limiting blocks positioned on two sides of the driving body, wherein the limiting blocks are arranged in limiting grooves.

Further specifically, the rotating member includes a rotating body, a rotating portion disposed at a lower portion of the rotating body and extending downward, and a working portion disposed at an upper portion of the rotating body, wherein a bottom of the rotating portion is inclined to form a rotating inclined surface.

More specifically, when the rotating member is located at the working low position, the limiting block and the rotating part are both located in the limiting groove, the rotating inclined plane is in contact with the spline teeth and is located at the upper half part of the spline teeth, and the rotating part is located at the working low position; when the rotating piece moves to the working high position, the limiting block moves upwards in the limiting groove, the spline teeth push the rotating part to move upwards, the spline teeth are connected with the fixed inclined plane, and the rotating inclined plane enters the working high position along the fixed inclined plane.

More specifically, an elastic piece is arranged between the rotating piece and the base, and the elastic piece enables the rotating piece to be close to the positioning piece.

Further specifically, the electromagnetic assembly comprises a magnetic core, a coil arranged on the magnetic core, and a magnetic ejector rod arranged in the magnetic core, wherein the top of the magnetic ejector rod is used for jacking the driving piece.

More specifically, the execution unit includes a first rotation shaft, a second rotation shaft, a first lever disposed on the first rotation shaft, and a second lever disposed on the second rotation shaft, and both the first rotation shaft and the second rotation shaft are fixed in the housing; the two ends of the first lever are respectively an end part a and an end part b, the two ends of the second lever are respectively an end part c and an end part d, the end part a is connected with the breaker, the end part b abuts against the end part c, and the end part d is connected with the electromagnetic assembly; the electromagnetic assembly drives the end part d to rotate the second lever, so that the end part c drives the first lever to rotate, and the end part a controls the working state of the circuit breaker.

Further specifically, the control unit comprises a PCB assembly fixed inside the shell and an external plug connected with the PCB assembly, the external plug is connected with an external control computer, and the PCB assembly is connected with the electromagnetic assembly and used for controlling the electrification or the outage of the electromagnetic assembly.

Further specifically, the housing includes an inner cavity, a housing body with an opening on one side, a cover plate disposed at the opening, and a buckle assembly disposed between the housing body and the cover plate.

The utility model has the advantages that: through adopting above-mentioned protection mechanism, under restriction circuit breaker combined floodgate operating condition, the mechanical structure of adoption carries on spacingly, and the electromagnetism subassembly does not switch on, and the electromagnetism subassembly only switches on work state and the non-operating state switches on work state under the transient state that the non-operating state changes operating condition into, has improved this protection mechanism operating condition's stability to manufacturing cost has been reduced, the life of extension electromagnetism subassembly, thereby the emergence of incident in the reduction circuit system.

Drawings

FIG. 1 is a schematic structural view of the present invention (without a cover plate);

FIG. 2 is a schematic structural diagram of an execution unit of the present invention;

FIG. 3 is a schematic structural diagram of the power unit of the present invention;

FIG. 4 is a schematic cross-sectional view of the power unit of the present invention;

FIG. 5 is a schematic view of the structure of the base and the positioning member of the present invention;

FIG. 6 is a schematic cross-sectional view of the base and the positioning member of the present invention;

FIG. 7 is an enlarged schematic view of portion A of FIG. 6;

fig. 8 is a schematic structural view of the driving member of the present invention;

fig. 9 is a schematic structural view of the rotating member of the present invention;

fig. 10 is a schematic structural view of the housing of the present invention;

fig. 11 is an enlarged schematic view of a portion B in fig. 10.

In the figure: 1. a housing; 2. an execution unit; 3. a power unit; 4. a control unit; 11. a housing body; 12. a cover plate; 13. a limiting rod; 14. a second card slot; 15. a third rotating shaft; 16. a second clamping falcon; 21. a first rotating shaft; 22. a second rotating shaft; 23. a first lever; 24. a second lever; 31. a base; 32. an electromagnetic assembly; 33. a limiting component; 311. a rectangular frame body; 312. a pipe body; 321. a magnetic core; 322. a magnetic ejector rod; 331. a positioning member; 332. a drive member; 333. a rotating member; 3111. a positioning bar; 3112. a limiting strip; 3311. positioning a groove; 3312. a limiting groove; 3313. a first fixed ramp; 3314. a second fixed ramp; 3315. a baffle plate; 3321. a drive body; 3322. a limiting block; 3323. flower teeth; 3331. rotating the body; 3332. a rotating part; 3333. rotating the inclined plane; 3334. a working part; 3335. an annular groove.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, an overvoltage and undervoltage protection mechanism with a holding function is installed on a circuit breaker, and can limit the circuit breaker to be switched on when an electric power system is in overvoltage or undervoltage, the protection mechanism includes a housing 1, an execution unit 2 disposed in the housing 1, a power unit 3 driving the execution unit 2 to move, and a control unit 4 for controlling the power unit 3, the control unit 4 receives an external signal, the power unit 3 shown in fig. 3 and 4 includes a base 31 fixed in the housing 1, an electromagnetic assembly 32 disposed on the base 31, and a limiting assembly 33 disposed on the base 31 and driven by the electromagnetic assembly 32, the limiting assembly 33 includes a positioning member 331, a driving member 332, and a rotating member 333, the positioning member 331 is disposed with a working high position and a working low position, and the electromagnetic assembly 32 enables the driving member 332 to move up and down, the driving element 332 drives the rotating element 333 to rotate in the positioning element 331 and stay at the working high position or the working low position for positioning; when the rotating piece 333 is located at the working high position, the execution unit 2 limits the circuit breaker to be switched on; when the rotating piece 333 is located at the working low position, the closing of the circuit breaker is not limited.

When the power system is in overvoltage or undervoltage, the control unit 2 receives an external signal and converts the signal into a stable voltage signal to be transmitted to the electromagnetic assembly 32, the electromagnetic assembly 32 acts to enable the driving member 332 to move upwards, the driving member 332 pushes the rotating member 333 to move upwards, the rotating member 333 is in contact with the positioning member 331 to enable the rotating member 333 to rotate, the rotating member 333 stops at a working high position or a working low position in the rotating process, the rotating member 333 drives the execution unit 2 to act in a working state when at the working high position, and the execution unit 2 limits the closing of the circuit breaker; and when the rotating piece 333 is in a low working position, the execution unit 2 falls back to be in a non-working state, and the breaker can be freely switched on.

As shown in fig. 2, the actuating unit 2 includes a first rotating shaft 21, a second rotating shaft 22, a first lever 23 disposed on the first rotating shaft 21, and a second lever 24 disposed on the second rotating shaft 22, wherein the first rotating shaft 21 and the second rotating shaft 22 are fixed in the housing 1; the two ends of the first lever 23 are respectively an end a and an end b, the two ends of the second lever 24 are respectively an end c and an end d, the end a is connected with the circuit breaker, the end b is abutted against the end c, and the end d is connected with the electromagnetic assembly 32; the power unit 3 is divided into two states, corresponding to the working state and the non-working state of the protection mechanism; in the first operating state, the control unit 4 energizes the electromagnetic assembly 32, the electromagnetic assembly 32 moves to make the rotating member 333 located at the operating high position, the rotating member 333 abuts against the end d to make the end d move upwards so as to drive the second lever 24 to rotate, the end c moves downwards, the end c drives the end b to move downwards so as to drive the first lever 23 to rotate, the end a moves upwards to the operating position, and the circuit breaker cannot be switched on; the second is a non-working state, the control unit 4 energizes the electromagnetic assembly 32, the electromagnetic assembly 32 moves to enable the rotating member 333 to be located at a working low position, the rotating member 333 is separated from the end portion d, at this time, the circuit breaker can be switched on, and the first lever 23 and the second lever 24 are enabled to return to the initial positions in the switching-on process; the restoration of the initial position of the first lever 23 and the second lever 24 can also be achieved by providing a torsion spring on the first lever 23.

As shown in fig. 5, 6 and 7, the base 31 includes a rectangular frame 311 for positioning the electromagnetic assembly 32, and a tube 312 located at the top of the rectangular frame 311 is a cover body sleeved on the top of the tube 312, a through hole is formed in the middle of the cover body, a first clamping tenon is arranged on the outer wall of the tube 312, a first clamping groove is arranged in the corresponding cover body, the first clamping groove is matched with the first clamping tenon, and a positioning bar 3111 and a limiting bar 3112 are arranged on the inner wall of the rectangular frame 311, so that the electromagnetic assembly 32 can be accurately and quickly positioned and installed; the positioning member 331 is fixed on the inner wall of the tube body 312, meanwhile, a through hole is formed in the middle of the positioning member 331, the positioning member 331 and the tube body 312 can be integrally formed, the positioning member 331 is provided with 4 limiting grooves 3312, the limiting grooves 3312 are uniformly arranged on the positioning member 331, a positioning groove 3311 is arranged between every two adjacent limiting grooves 3312, so that the number of the positioning grooves 3311 is 4, the lowest point of each positioning groove 3311 is higher than the working point of the corresponding limiting groove 3312, a working high position is arranged in each positioning groove 3311, and a working low position is arranged in each limiting groove 3312; a fixing inclined plane is arranged between the positioning groove 3311 and the limiting groove 3312, the fixing inclined plane has 4 groups, each group has 2 positioning inclined planes, which are respectively a first fixing inclined plane 3313 from a low position to a high position and a second fixing inclined plane 3314 from the high position to the low position; the bottom of the position-limiting groove 3312 is a stop plate 3315, which can limit the positions of the driving member 332 and the rotating member 333 from falling out of the position-limiting groove 3312.

As shown in fig. 8, the driving member 332 includes a driving body 3321, a spline 3323 disposed on the top of the driving body 3321, and two limiting blocks 3322 disposed on two sides of the driving body 3321, wherein the limiting blocks 3322 are disposed in the limiting grooves 3312 of the positioning member 331, and the number of the corresponding limiting blocks 3322 is 4, the electromagnetic assembly 32 enables the driving body 3321 to move up and down, the limiting blocks 3322 move up and down in the limiting grooves 3312, the driving member 332 can only move up and down due to the action of the limiting grooves 3312, the outer diameter of the driving body 3321 is smaller than the inner diameter of the positioning member 331, and the limiting blocks 332 are engaged in the limiting grooves 3312, so as to enable the driving member 332 to move up and; the spline 3323 is composed of a plurality of symmetrical inclined planes, the spline 3323 has 8 tooth forms, the 8 tooth forms are arranged corresponding to the 4 positioning slots 3311 and the 4 limiting slots 3312 one by one, the upper half part of each tooth form is overlapped with the corresponding positioning slot 3311 or limiting slot 3312, and the lower half part is overlapped with the first fixing inclined plane 3313 or the second fixing inclined plane 3314. To reduce weight, the interior of the driving body 3321 is a cavity, the upper portion of which is open.

As shown in fig. 9, the rotary member 333 includes a rotary body 3331, a rotary part 3332 disposed at a lower portion of the rotary body 3331 and extending downward, and a working part 3334 disposed at an upper portion of the rotary body 3331, wherein a bottom of the rotary part 3332 is inclined to a rotary inclined surface 3333; the portion 3332 that rotates is provided with 4, the external diameter that 4 rotation portions 3332 are constituteed is greater than the internal diameter of setting element 331 through-hole and is less than the internal diameter of body 312, the size of rotation portion 3332 can insert in the spacing groove 3312, the rotation inclined plane 3333 of rotation portion 3332 bottom can also need contact with fixed inclined plane simultaneously with the flower tooth 3323 contact on radial direction, it is inside and outside to rotate inclined plane 3333 to divide into on radial direction promptly, the outside contacts with fixed inclined plane in the course of the work, inside contacts with flower tooth 3323 in the course of the work. An elastic body is arranged between the rotating body 3331 and the cover body, the elastic body can enable the rotating body 3331 to approach the positioning piece 331, and the elastic body is a compression spring. The working part 3334 is a mandril which passes through a through hole in the middle of the cover body, the compression spring is sleeved on the mandril, a circle of annular groove 3335 is arranged on the rotating body 3331, the mandril is arranged in the middle of the annular groove 3335, one end of the compression spring is clamped in the annular groove 3335, the other end of the compression spring abuts against the cover body, and the compression spring is limited.

As shown in fig. 4, the electromagnetic assembly 2 includes a magnetic core 331, a coil disposed on the magnetic core 331, and a magnetic ejector rod 322 disposed in the magnetic core 321, wherein a top of the magnetic ejector rod 322 is used for ejecting the driving member 332, and a primary upward movement of the magnetic ejector rod 332 is realized by energizing the coil once.

The power unit 3 includes an operating state, a non-operating state and two transition states, the operating state is an open operating state at a high operating position, the non-operating state is a close operating state at a low operating position, the two transition states are respectively a close transition state from the high operating position to the low operating position and an open transition state from the low operating position to the high operating position, and the open operating state, the close transition state, the close operating state and the open transition state are described in sequence below.

The opening working state is a static working state, at this time, the rotating part 3332 is positioned in the positioning groove 3311, and the ejector rod forces the electric operating mechanism to be in the opening state, so that the breaker cannot be switched on; the limit block 3322 of the driving member 332 is located in the limit slot 3312, and due to the action of the baffle 3315 at the bottom of the limit slot 3312, the driving member 332 is located at the lowest end of the limit slot 3312, and the driving member 332 is not in contact with the rotating member 333; the solenoid assembly 32 is not energized.

The closing transition state is a dynamic process, the electromagnetic assembly 32 is electrified to trigger, a coil in the electromagnetic assembly 32 is electrified to form a magnetic field, the magnetic ejector rod 322 moves upwards, the magnetic ejector rod 322 is in contact with the driving body 3321 and pushes the driving body 3321 to move upwards, and the driving body 3321 can only move along the axial direction due to the action of the limiting block 3322 and the limiting groove 3312 on the driving body 3321; when the driving member 332 contacts the rotating member 333, i.e. the spline teeth 3323 contact the inclined rotating surface 3333 of the rotating part 3332, the driving member 332 pushes the rotating member 333 to move upwards, when the rotating member 333 disengages from the positioning slot 3312, the tooth profile of the spline teeth 3323 connects with the second inclined fixed surface 3314 to form a communicating inclined surface, because the inclined rotating surface 3333 contacts only the upper half of the tooth profile of the spline teeth 3323 and is not limited by the positioning slot 3312, the inclined rotating surface 3333 continues to slide towards the lower half of the tooth profile of the spline teeth 3323, and when the inclined rotating surface 3333 enters the lower half of the tooth profile of the spline teeth 3323, the inclined rotating surface 3333 enters the second inclined fixed surface 3314; at this time, the electromagnetic assembly 32 is powered off, the magnetic ejector rod 322 returns to the initial position due to gravity and no longer provides power to the driving member 332, the driving member 332 moves downward due to gravity and falls back into the position-limiting groove 3312, the rotating inclined surface 3333 no longer contacts with the spline teeth 3323 and only contacts with the second fixed inclined surface 3314, the rotating portion 3332 moves obliquely downward along the second fixed inclined surface 3314 and enters the position-limiting groove 3312, and when the rotating inclined surface 3333 contacts with the spline teeth 3323 in the position-limiting groove 3312, the operating position is low.

The closing working state is a static working state, at this time, the limit block 3322 and the rotating part 3332 are positioned in the limit groove 3312, the rotating inclined plane 3333 is contacted with the upper half part of the tooth form of the flower tooth 3323, the ejector rod is separated from the contact of the electric operating mechanism, and the breaker can be switched on at any time; the solenoid assembly 32 is not energized.

The opening transition state is a dynamic process, the electromagnetic component 32 is powered on, so that the magnetic top rod 322 moves upwards, the magnetic top rod 322 pushes the driving component 332 and the rotating component 333 to move upwards along the axial direction, when the driving component 332 and the rotating component 333 move to the highest point, the tooth form of the spline 3323 and the first inclined surface 3313 form a communicated inclined surface, the rotating component 3332 is not blocked by the limiting groove 3312, the rotating inclined surface 3333 enters the first fixed inclined surface 3313 along the tooth form of the spline 3323, at this time, the electromagnetic component 32 is powered off, the magnetic top rod 322 falls back, the driving component 332 falls back, and the rotating inclined surface 3333 enters the positioning groove 3311 along the first fixed inclined surface 3313 and enters the working high position.

As shown in fig. 1, the control unit 4 includes a PCB assembly 41 fixed inside the housing 1 and an external plug 42 connected to the PCB assembly 41, the external plug 42 is connected to an external control computer, the PCB assembly 41 is connected to the electromagnetic assembly 32 and is used for controlling the electromagnetic assembly 32 to be powered on or powered off; after receiving the overvoltage or undervoltage signal in the power system, the external control computer transmits the signal to the PCB assembly 41, and transmits the constant voltage signal to the electromagnetic assembly 32 after being processed by the PCB assembly 41, thereby controlling the movement of the electromagnetic assembly 32.

As shown in fig. 10 and 11, the housing 1 includes a housing 11 having an inner cavity and an opening, a cover plate 12 disposed at an open position, and a locking assembly disposed between the housing 11 and the cover plate 12, a limiting rod 13 is disposed at a plurality of positions in the housing 11, the cover plate 12 is locked by the limiting rod 13, the locking assembly includes a second locking tenon 16 disposed at the housing 11 and a second locking groove 14 disposed at the cover plate 12, a third rotating shaft 15 is disposed at the housing 11, the second locking tenon 16 is disposed at the third rotating shaft 15 and can rotate around the third rotating shaft 15, and the second locking tenon 16 can rotate to achieve quick connection and disconnection between the housing 11 and the cover plate 12.

In conclusion, after the overvoltage and undervoltage protection mechanism is adopted, two working states are mainly respectively working state and non-working state, the working high position and the working low position of the power monocular corresponding to the two working states are realized through interaction between the mechanical structures, the working state or the non-working state is not maintained by electrifying the electromagnetic assembly 32 in the using process, and the electromagnetic assembly 32 is only electrified and used in the triggering process, so that the stability of the mechanism is greatly improved, the production cost is reduced, and meanwhile, the occurrence of safety accidents is reduced.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and any simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides an cross undervoltage protection mechanism with retention function, installs on the circuit breaker, includes casing (1), the execution unit (2) of setting in casing (1), power pack (3) of drive execution unit (2) motion and be used for controlling the control unit (4) of power pack (3), control unit (4) receive external signal, characterized in that, power pack (3) including fix base (31) in casing (1), set up electromagnetic component (32) on base (31) and set up on base (31) and spacing subassembly (33) through electromagnetic component (32) drive, spacing subassembly (33) include setting element (331), driving piece (332) and rotating member (333), setting element (331) on set up work high level and work low level, electromagnetic component (32) make driving piece (332) move from top to bottom, the driving piece (332) drives the rotating piece (333) to rotate in the positioning piece (331) and stay at a working high position or a working low position for positioning; when the rotating piece (333) is located at a working high position, the execution unit (2) limits the closing of the circuit breaker; when the rotating piece (333) is located at a low working position, the closing of the circuit breaker is not limited.

2. The under-voltage protection mechanism with holding function as claimed in claim 1, wherein the positioning member (331) is fixed on the base (31), the positioning member (331) has at least one working high position and at least one working low position, and a fixing slope for driving the rotation member (333) to rotate is arranged between the working high position and the working low position; and a limit groove (3312) is arranged at the working low position.

3. The under-voltage protection mechanism with holding function as claimed in claim 2, wherein the driving member (332) comprises a driving body (3321), a spline (3323) disposed on the top of the driving body (3321), and a limiting block (3322) disposed on both sides of the driving body (3321), wherein the limiting block (3322) is disposed in the limiting groove (3312).

4. The under-voltage protection mechanism with holding function as claimed in claim 3, wherein the rotary member (333) comprises a rotary body (3331), a rotary part (3332) disposed at a lower portion of the rotary body (3331) and extending downward, and a working part (3334) disposed at an upper portion of the rotary body (3331), wherein a bottom of the rotary part (3332) is inclined to form a rotary inclined surface (3333).

5. The under-voltage protection mechanism with holding function according to claim 4, wherein when the rotating member (333) is located at the working low position, the stopper (3322) and the rotating part (3332) are both located in the stopper slot (3312), the inclined rotating surface (3333) is in contact with the spline (3323) and is located at the upper half of the spline (3323), and the rotating part (3332) is located at the working low position; when the rotating piece (333) moves to the working high position, the limiting block (3322) moves upwards in the limiting groove (3312), the spline teeth (3323) push the rotating part (3332) to move upwards, the spline teeth (3323) are connected with the fixed inclined surface, and the rotating inclined surface (3333) enters the working high position along the fixed inclined surface.

6. The under-voltage protection mechanism with holding function according to claim 1, wherein an elastic member is disposed between the rotating member (333) and the base (31), and the elastic member makes the rotating member (333) close to the positioning member (331).

7. The overvoltage and undervoltage protection mechanism with the holding function according to claim 1, wherein the electromagnetic assembly (32) comprises a magnetic core (321), a coil disposed on the magnetic core (321), and a magnetic ejector rod (322) disposed in the magnetic core (321), and a top of the magnetic ejector rod (322) is used for ejecting the driving member (332).

8. The under-voltage protection mechanism with holding function according to claim 1, wherein the actuating unit (2) comprises a first rotating shaft (21), a second rotating shaft (22), a first lever (23) disposed on the first rotating shaft (21), and a second lever (24) disposed on the second rotating shaft (22), the first rotating shaft (21) and the second rotating shaft (22) are fixed in the casing (1); the two ends of the first lever (23) are respectively an end part a and an end part b, the two ends of the second lever (24) are respectively an end part c and an end part d, the end part a is connected with the breaker, the end part b is abutted against the end part c, and the end part d is connected with the electromagnetic assembly (32); the electromagnetic assembly (32) drives the end part d to rotate the second lever (24), so that the end part c drives the first lever (23) to rotate, and the end part a controls the working state of the circuit breaker.

9. The overvoltage and undervoltage protection mechanism with the holding function according to claim 1, wherein the control unit (4) comprises a PCB assembly (41) fixed inside the housing (1) and an external plug (42) connected to the PCB assembly (41), the external plug (42) is connected to an external control computer, and the PCB assembly (41) is connected to the electromagnetic assembly (32) and is used for controlling the electromagnetic assembly (32) to be powered on or powered off.

10. The under-voltage protection mechanism with holding function according to claim 1, wherein the housing (1) comprises an inner cavity and a housing body (11) with an opening, a cover plate (12) disposed at the opening position, and a snap-fit assembly disposed between the housing body (11) and the cover plate (12).

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