Instantaneous tripping circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and discloses an instantaneous tripping circuit breaker which comprises a bottom plate, a handle convenient to toggle is arranged above the bottom plate, the handle is located on the inner side of the bottom plate and connected with a pull rod, the front face of the bottom plate is hinged to a moving contact assembly through a fixing shaft, and the bottom plate is hinged to a jump pin through the outer side of the fixing shaft. The outer side of the fixed shaft is movably connected with a moving contact assembly which is in contact with the static contact assembly for electrification, the moving contact assembly is hinged with a lock catch through a movable shaft, the surface of the lock catch is provided with a fixed hole, the end part, far away from the handle, of the pull rod extends into the inner side of the fixed hole, and the side surface, close to the jump pin, of the lock catch is clamped with the side surface of the jump pin. Instantaneous characteristics of various specifications are met by utilizing the types of the torsional springs, the number of turns of the coils and different assembly positions of the torsional springs, and compared with a traditional product, the process is simple, the number of parts is reduced, and the process consistency is easy to control.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to an instantaneous tripping circuit breaker. Background Art

[0002] The main function of the circuit breaker is that when the current in the circuit exceeds the rated value of the circuit breaker, the circuit breaker will automatically disconnect the circuit to prevent equipment overheating and burning due to excessive current. When a short circuit occurs in the circuit, the current will increase instantly. At this time, the circuit breaker can quickly cut off the circuit to prevent the short circuit current from causing serious damage to the circuit and equipment. The circuit breaker also has a leakage protection function. When leakage occurs in the circuit, the circuit breaker can automatically disconnect the circuit to prevent electric shock to personnel and damage to equipment, thereby improving electricity safety.

[0003] The circuit breaker of the prior art has a slow power-off speed, which affects the safety of electricity use. A circuit breaker that can instantly cut off the power is needed to improve the safety of electricity use. During the opening and closing process of the moving and static contacts, the hole opened on the surface of the moving contact is always pulled by the tension spring to rotate, and the local area where the end of the tension spring contacts the inner wall of the hole is small, the force is large, and the local wear of the inner wall of the hole is large. After long-term use, it will be deformed due to the pulling of the tension spring, which affects the effectiveness of the tension spring in resetting the moving contact and reduces its service life. Utility Model Content

[0004] The present application proposes an instantaneous trip circuit breaker, which has the advantages of high tripping efficiency and the hole connecting the moving contact and the tension spring is not easy to deform, so as to solve the problems of slow instantaneous power off and local wear and deformation of the hole connecting the tension spring proposed in the above background technology.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an instantaneous trip circuit breaker, comprising a base plate, a handle for easy toggle is provided on the top of the base plate, the handle is located on the inner side of the base plate and is connected to a pull rod, a moving contact assembly is hinged on the front side of the base plate through a fixed shaft, and a jump buckle is hinged on the outer side of the base plate through the fixed shaft, a moving contact assembly that contacts and energizes the static contact assembly is movably connected to the outer side of the fixed shaft, the moving contact assembly is hinged on the movable shaft with a lock buckle, and a fixing hole is opened on the surface of the lock buckle, and the end of the pull rod away from the handle is The part extends into the inner side of the fixing hole, the side of the lock buckle close to the jump buckle is clamped with the side of the jump buckle, the surface of the moving contact assembly is connected with a tension spring through the opened movable hole, and the other end of the tension spring away from the moving contact assembly is connected with the inside of the base plate, an iron core assembly is provided on the inner side of the base plate, and a coil is wound on the outer side of the iron core assembly, an arc extinguishing grid for extinguishing arc is provided on the inner side of the base plate, the inner side of the base plate is connected with a bimetallic strip through an adjustment bracket and a soft connection, and the bimetallic strip is located on the counterclockwise side of the moving contact assembly, and a torsion spring is provided at the tail end of the iron core assembly.

[0006] Furthermore, the bimetallic strip is a bimetallic strip. When an overcurrent flows, the bimetallic strip heats up and bends to push the trip button, so that the trip button is separated from the lock button. Under the action of the tension spring and the pull rod, the static contact assembly and the moving contact assembly are separated, cutting off the circuit.

[0007] Furthermore, when a large short-circuit current flows, the magnetic force of the coil on the core assembly causes the core assembly to move rapidly in the direction of the tripping buckle, pushing the tripping buckle to separate the tripping buckle from the lock buckle. Under the action of the tension spring and the pull rod, the static contact assembly and the moving contact assembly separate, cutting off the circuit.

[0008] Furthermore, when the power is normally supplied, the bimetallic strip does not generate heat and does not bend, the magnetic force generated by the coil on the core assembly is small and continuously energized, and the static contact assembly and the moving contact assembly remain in a closed state.

[0009] Furthermore, a driving component is connected to the outer side of the fixed shaft, and the driving component includes a fixed ring circumferentially located on the outer side of the fixed shaft, and a butt plate is hinged on the outer side of the fixed ring close to the movable hole, and a return spring is connected to the inner side of the butt plate facing in the clockwise direction, and the end of the return spring away from the butt plate is connected to the outer side of the fixed ring, and a passive component is adjusted on the inner side of the movable hole, and the passive component includes a movable ring circumferentially arranged along the inner side of the movable hole, and the outer side of the movable ring is circumferentially equiangularly connected with helical teeth in the shape of a right-angled triangle, and one right-angled side of the helical teeth is tangential to the outer side of the movable ring, and the other right-angled side faces in the clockwise direction.

[0010] Furthermore, an airbag assembly is connected to the inner side of the tension spring, and the airbag assembly includes a telescopic airbag, and the telescopic airbag is in a non-contracted state when the tension spring is in a stretched state, one end of the telescopic airbag is connected to an outlet pipe for one-way gas discharge, and the other end of the telescopic airbag is connected to an inlet pipe for one-way gas input, the outer side of the base plate is connected to a cylinder assembly filled with compressed gas, and the inlet pipe is connected to the inner side of the cylinder assembly, and a valve body assembly is provided on the inner side of the base plate located on the counterclockwise side of the moving contact assembly, and the on and off of the inlet pipe and the outlet pipe are controlled by the valve body assembly.

[0011] Furthermore, when the moving contact assembly is disconnected from the stationary contact assembly, the moving contact assembly will rotate counterclockwise and push the valve body assembly to move to open the air inlet pipe and close the air outlet pipe. When the moving contact assembly rotates clockwise and is about to close with the stationary contact assembly, the moving contact assembly will rotate clockwise and release the valve body assembly to move to close the air inlet pipe and open the air outlet pipe again.

[0012] The beneficial effects of the utility model are that the instantaneous characteristics of various specifications are met by utilizing the type of torsion spring, the number of turns of the coil and the different assembly positions of the torsion spring. Compared with traditional products, the process is simpler, the number of parts is reduced and the process consistency is better controlled.

[0013] The multi-link mechanism, which consists of a handle, a pull rod, a lock, a moving contact assembly, and related connections and movable shafts, optimizes redundant transition parts. The action speed is faster and more sensitive. The lock is made of wear-resistant metal parts, and the buckle position with the fixing hole adopts R angle technology. While the action is reliable, it greatly improves the life of the mechanism.

[0014] The tripping design is integrated into one piece, integrating instantaneous tripping, delayed tripping, and external active and passive tripping. The integrated design of the adjustment bracket not only satisfies the function of adjusting the gap between the bimetallic strip and the tripping, but also has the function of driving the disconnected arc to the arc extinguishing grid, simplifying the process. The high-current limiting arc extinguishing grid uses the electromagnetic drive principle to drive the arc, and then uses the fine gap insulation wall to generate arc extinguishing gas to tangle the arc column, greatly improving the current limiting characteristics. The high-temperature gas generated in the arc extinguishing grid is rapidly cooled and discharged through the filtering device composed of the arc extinguishing grid and the outer shell. In this way, the arc is attracted, becomes longer, thinner, and cooled, and the arc extinguishing function is achieved quickly.

[0015] By setting the driving component and the passive component, the contact surface between the end of the telescopic airbag and the tension spring is always rotating and changing, so that the effective area of ​​the inner wall of the telescopic airbag that can be used for wear is large, that is, the wear amount of a single local area is small, so that the inner wall of the telescopic airbag wears synchronously, the wear rate of the telescopic airbag is slowed down, and the service life of the telescopic airbag is increased. Furthermore, through the protection of the movable hole by the telescopic airbag, the deformation speed of the movable hole is slowed down, and the efficiency of the tension spring pulling the moving contact assembly to rotate through the movable hole is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0017] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0018] Figure 1 It is a schematic diagram of the closed state of the movable contact assembly structure and the stationary contact assembly structure of the utility model;

[0019] Figure 2 It is a partial schematic diagram of the structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the drive wheel structure of the utility model;

[0021] Figure 4 It is a cutaway schematic diagram of the movable ring structure of the utility model.

[0022] In the figure: 1. bottom plate; 2. handle; 3. pull rod; 4. fixed shaft; 5. jump buckle; 6. moving contact assembly; 7. movable shaft; 8. lock buckle; 9. fixing hole; 10. tension spring; 11. movable hole; 12. core assembly; 13. coil; 14. arc extinguishing grid; 15. static contact assembly; 16. adjustment bracket; 17. soft connection; 18. bimetallic strip; 19. drive assembly; 191. fixed ring; 192. abutment plate; 193. reset spring; 20. passive assembly; 201. movable ring; 202. oblique teeth; 21. airbag assembly; 211. telescopic airbag; 212. outlet pipe; 213. inlet pipe; 22. cylinder assembly; 23. valve body assembly; 24. torsion spring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Embodiment 1

[0024] See also Figure 1 , an instantaneous trip circuit breaker, including a base plate 1, a handle 2 for easy toggle is provided above the base plate 1, the handle 2 is located on the inner side of the base plate 1 and is connected with a pull rod 3, a moving contact assembly 6 is hinged on the front of the base plate 1 through a fixed shaft 4, and a jump buckle 5 is hinged on the outer side of the fixed shaft 4 of the base plate 1, a moving contact assembly 6 that contacts and energizes with a static contact assembly 15 is movably connected to the outer side of the fixed shaft 4, the moving contact assembly 6 is hinged with a lock buckle 8 through a movable shaft 7, and a fixing hole 9 is opened on the surface of the lock buckle 8, the end of the pull rod 3 away from the handle 2 extends into the inner side of the fixing hole 9, the side of the lock buckle 8 close to the jump buckle 5 is clamped with the side of the jump buckle 5, and the surface of the moving contact assembly 6 is connected to the fixed contact assembly 15 through the movable hole 11 opened A tension spring 10 is connected, and the other end of the tension spring 10 away from the moving contact assembly 6 is connected to the inside of the base plate 1, an iron core assembly 12 is provided on the inner side of the base plate 1, and a coil 13 is wound on the outer side of the iron core assembly 12, an arc extinguishing grid 14 for extinguishing the arc is provided on the inner side of the base plate 1, a bimetallic strip 18 is connected to the inner side of the base plate 1 through an adjustment bracket 16 and a soft connection 17, and the bimetallic strip 18 is located on the counterclockwise side of the moving contact assembly 6, a torsion spring 24 is provided at the tail end of the iron core assembly 12, and various specifications of instantaneous characteristics are met by utilizing the type of torsion spring 24, the number of turns of the coil 13 and the different assembly positions of the torsion spring 24, which has a simpler process than traditional products, a reduced number of parts and good control of process consistency.

[0025] See also Figure 1 and Figure 2The bimetallic strip 18 is a bimetallic strip. When an overcurrent flows, the bimetallic strip 18 heats up and bends to push the trip buckle 5, so that the trip buckle 5 is separated from the lock buckle 8. Under the action of the tension spring 10 and the pull rod 3, the static contact assembly 15 and the moving contact assembly 6 are separated to cut off the circuit. When a short-circuit current flows, the magnetic force of the coil 13 on the iron core assembly 12 causes the iron core assembly 12 to move rapidly toward the trip buckle 5, pushing the trip buckle 5, so that the trip buckle 5 is separated from the lock buckle 8. Under the action of the tension spring 10 and the pull rod 3, the static contact assembly 15 and the moving contact assembly 6 are separated to cut off the circuit. When the power is normally on, the bimetallic strip 18 has no heat and does not bend. The magnetic force generated by the coil 13 on the iron core assembly 12 is small and continuously energized. The static contact assembly 15 and the moving contact assembly 6 remain in a closed state, clarifying the working process when the overcurrent flows, and the tension spring 10 is always in a stretched state. Embodiment 2

[0026] Embodiment 2 is based on Embodiment 1. Please refer to Figure 2 and Figure 3 The outer side of the fixed shaft 4 is connected with a driving assembly 19, which includes a fixed ring 191 circumferentially located outside the fixed shaft 4, and a side of the outer side of the fixed ring 191 close to the movable hole 11 is hinged with a plate 192, and the inner side of the plate 192 facing the clockwise direction is connected with a return spring 193, and the end of the return spring 193 away from the plate 192 is connected to the outer side of the fixed ring 191, and the inner side of the movable hole 11 is adjusted with a passive assembly 20, and the passive assembly 20 includes a movable ring 201 arranged along the inner side of the movable hole 11, and the outer side of the movable ring 201 is circumferentially arranged. The movable ring 201 is connected to the movable ring 201 at equal angles with bevel teeth 202 in the shape of a right triangle, and one right-angled side of the bevel teeth 202 is tangential to the outside of the movable ring 201, and the other right-angled side is in the clockwise direction. The movable ring 201 is connected to the side of the inner wall of the movable hole 11 close to a unidirectional elastic retaining structure, and the unidirectional elastic retaining structure on the inner side of the movable ring 201 cooperates with the ratchet connected to the inner wall of the movable hole 11, so that the movable ring 201 can be rotated in the circumferential direction of the movable hole 11, which is convenient for the contact local rotation between the inner wall of the movable ring 201 and the tension spring 10, so that the wear of the inner wall of the movable ring 201 is more uniform.

[0027] See also Figure 2The inner side of the tension spring 10 is connected with an airbag assembly 21, and the airbag assembly 21 includes a telescopic airbag 211, and the telescopic airbag 211 is in a non-contracted state when the tension spring 10 is in a stretched state, that is, the telescopic airbag 211 does not affect the stretching process of the tension spring 10, ensuring the stretching effectiveness of the tension spring 10, one end of the telescopic airbag 211 is connected with an outlet pipe 212 for unidirectional exhaust of gas, and the other end of the telescopic airbag 211 is connected with an inlet pipe 213 for unidirectional input of gas, the outer side of the bottom plate 1 is connected with a cylinder assembly 22 filled with compressed gas, and the inlet pipe 213 is connected to the inner side of the cylinder assembly 22 A valve body assembly 23 is provided on the inner side of the bottom plate 1, which is located on the counterclockwise side of the moving contact assembly 6. The on and off of the air inlet pipe 213 and the air outlet pipe 212 are controlled by the valve body assembly 23. The cylinder assembly 22 is a piston-type gas booster device. The external gas is sucked into the inner side by manually stretching the internal piston rod, and the sucked gas is pressurized by pushing the piston. After pressurization, the piston is fixed relative to the inner side of the piston cylinder by snap connection to ensure the subsequent access of the air inlet pipe 213. After an abnormal power failure due to a current, the gas inside the cylinder assembly 22 can be pressurized manually to ensure the continued effectiveness of use.

[0028] See also Figure 1 and Figure 2 When the moving contact assembly 6 is disconnected from the stationary contact assembly 15, the moving contact assembly 6 will rotate counterclockwise and push the valve body assembly 23 to move to open the air inlet pipe 213 and close the air outlet pipe 212. When the moving contact assembly 6 rotates clockwise and is about to close with the stationary contact assembly 15, the moving contact assembly 6 will rotate clockwise and release the valve body assembly 23 to move to close the air inlet pipe 213 and open the air outlet pipe 212 again. During the disconnection process between the stationary contact assembly 15 and the moving contact assembly 6, the tension spring 10 will contract, and the moving contact assembly 6 will drive the moving The hole 11 rotates relative to the driving component 19 on the outside of the fixed shaft 4, that is, the driving component 19 will push the passive component 20 to rotate as a whole relative to the movable hole 11, so that the inner wall portion of the movable ring 201 that contacts the tension spring 10 changes, and the portion of the inner side of the movable ring 201 that contacts the tension spring 10 always changes during the relative movement of the static contact component 15 and the moving contact component 6, so that the inner side of the movable ring 201 is evenly worn in the circumferential direction, avoiding deformation of the inner side of the movable ring 201 when it acts on the tension spring 10, thereby increasing the service life of the telescopic airbag 211.

[0029] The usage method (working principle) of the utility model is as follows:

[0030] When the power is normally on, the bimetallic strip 18 does not generate heat and does not bend, and the magnetic force generated by the coil 13 on the core assembly 12 is very small. Neither of them can push the trip button 5. The power is continuously on, and the static contact assembly 15 and the moving contact assembly 6 remain in the closed state.

[0031] When an overcurrent flows, the bimetallic strip 18 heats up, bends, and moves, pushing the trip latch 5 to separate the trip latch 5 from the lock latch 8. Under the action of the tension spring 10 and the pull rod 3, the static contact assembly 15 and the moving contact assembly 6 separate to cut off the circuit.

[0032] When a large short-circuit current flows, the coil 13 exerts a magnetic force on the core assembly 12, causing the core assembly 12 to move rapidly toward the trip latch 5, pushing the trip latch 5 to separate from the lock latch 8. Under the action of the tension spring 10 and the pull rod 3, the static contact assembly 15 and the moving contact assembly 6 separate, cutting off the circuit.

[0033] When the static contact assembly 15 and the moving contact assembly 6 are closed, the tension spring 10 is in the maximum stretched state, and the telescopic airbag 211 inside the tension spring 10 discharges the inner gas through the outlet pipe 212. The pressure difference between the telescopic airbag 211 and the outside is small, and the tension spring 10 contracts to pull the moving contact assembly 6 to rotate and break the circuit. After the static contact assembly 15 and the moving contact assembly 6 break the circuit, the moving contact assembly 6 pushes the valve body assembly 23 at the end of the rotation after the circuit is broken, so that the outlet pipe 212 is closed and the inlet pipe 213 is connected, so that the inlet pipe 213 passes the gas with a certain air pressure on the inside of the cylinder assembly 22 into the telescopic airbag 211. The air pressure increases when the gas is passed in instantly, so that the telescopic airbag 211 uses the air pressure to instantly expand circumferentially on the inner side of the tension spring 10 to stabilize the tension spring 10, reduce the shaking of the tension spring 10, stabilize the two ends of the tension spring 10, and reduce the movement of the tension spring 10 relative to the movable hole 11 due to contraction.

[0034] During the disconnection process of the static contact assembly 15 and the moving contact assembly 6, the tension spring 10 will shrink, and the moving contact assembly 6 will drive the movable hole 11 to rotate relative to the driving assembly 19 on the outside of the fixed shaft 4, that is, the driving assembly 19 will act to push the passive assembly 20 to rotate relative to the movable hole 11 as a whole, so that the inner wall portion of the movable ring 201 in contact with the tension spring 10 changes, so that the part of the inner side of the movable ring 201 in contact with the tension spring 10 always changes during the relative movement of the static contact assembly 15 and the moving contact assembly 6, so that the inner side of the movable ring 201 is evenly worn in the circumferential direction, avoiding deformation of the inner side of the movable ring 201 when it acts on the tension spring 10, ensuring the efficiency and effect of the tension spring 10 contracting and pulling the moving contact assembly 6, and when the static contact assembly 15 and the moving contact assembly 6 are closed again, the abutment plate 192 compresses the reset spring 193 in the direction of the fixed shaft 4 to rotate until the end of 102 contacts the outer side of the next helical tooth 202, waiting for the next relative movement between the static contact assembly 15 and the moving contact assembly 6.

Claims

1. An instantaneous trip circuit breaker, comprising a base plate (1), characterized in that: A handle (2) is provided above the base plate (1) for easy manipulation. The handle (2) is located on the inner side of the base plate (1) and is connected to a pull rod (3). A moving contact assembly (6) is hinged on the front side of the base plate (1) via a fixed shaft (4). A trip buckle (5) is hinged on the outer side of the fixed shaft (4). A moving contact assembly (6) that contacts and energizes the stationary contact assembly (15) is movably connected to the outer side of the fixed shaft (4). The moving contact assembly (6) is hinged to a lock buckle (8) via a movable shaft (7). A fixing hole (9) is provided on the surface of the lock buckle (8). The end of the pull rod (3) away from the handle (2) extends into the inner side of the fixing hole (9). The lock buckle (8) is close to the trip buckle (5). The side surface is snap-fitted with the side surface of the jumper (5); the surface of the moving contact assembly (6) is connected to a tension spring (10) through an opening (11); and the other end of the tension spring (10) away from the moving contact assembly (6) is connected to the inside of the base plate (1); an iron core assembly (12) is provided on the inner side of the base plate (1), and a coil (13) is wound around the outer side of the iron core assembly (12); an arc extinguishing grid (14) for extinguishing an arc is provided on the inner side of the base plate (1); a bimetallic strip (18) is connected to the inner side of the base plate (1) through an adjustment bracket (16) and a soft connection (17), and the bimetallic strip (18) is located on the counterclockwise side of the moving contact assembly (6); and a torsion spring (24) is provided at the tail end of the iron core assembly (12).

2. An instantaneous trip circuit breaker according to claim 1, characterized in that: The bimetallic strip (18) is a bimetallic strip. When an overcurrent flows, the bimetallic strip (18) heats up and bends to push the trip buckle (5), so that the trip buckle (5) is separated from the lock buckle (8). Under the action of the tension spring (10) and the pull rod (3), the static contact assembly (15) and the moving contact assembly (6) are separated, thereby cutting off the circuit.

3. The instantaneous trip circuit breaker according to claim 1, characterized in that: When a short-circuit current flows, the magnetic force of the coil (13) on the iron core assembly (12) causes the iron core assembly (12) to move rapidly in the direction of the trip buckle (5), pushing the trip buckle (5) so that the trip buckle (5) is separated from the lock buckle (8). Under the action of the tension spring (10) and the pull rod (3), the stationary contact assembly (15) and the moving contact assembly (6) are separated, thereby cutting off the circuit.

4. The instantaneous trip circuit breaker according to claim 1, characterized in that: When normally energized, the bimetallic strip (18) does not generate heat and does not bend, the magnetic force generated by the coil (13) on the iron core assembly (12) is small but continuously energized, and the static contact assembly (15) and the moving contact assembly (6) remain in a closed state.

5. The instantaneous trip circuit breaker according to claim 1, characterized in that: The outside of the fixed shaft (4) is connected to a driving assembly (19), the driving assembly (19) comprising a fixing ring (191) circumferentially located outside the fixed shaft (4), and a side of the outside of the fixing ring (191) close to the movable hole (11) is hingedly connected to a backing plate (192), the backing plate (192) is connected to the inner side facing in the clockwise direction with a return spring (193), and one end of the return spring (193) away from the backing plate (192) is connected to the outer side of the fixing ring (191), the inner side of the movable hole (11) is adjusted with a passive assembly (20), the passive assembly (20) comprising a movable ring (201) circumferentially arranged along the inner side of the movable hole (11), the outer side of the movable ring (201) is circumferentially connected with bevel teeth (202) in the shape of a right triangle at equal angles, and one right-angled side of the bevel teeth (202) is tangential to the outer side of the movable ring (201), and the other right-angled side faces in the clockwise direction.

6. An instantaneous trip circuit breaker according to claim 5, characterized in that: The inner side of the tension spring (10) is connected to an airbag assembly (21), the airbag assembly (21) comprising a telescopic airbag (211), and when the tension spring (10) is in a stretched state, the telescopic airbag (211) is in a non-contracted state; one end of the telescopic airbag (211) is connected to an outlet pipe (212) for unidirectionally discharging gas, and the other end of the telescopic airbag (211) is connected to an inlet pipe (213) for unidirectionally inputting gas; the outer side of the bottom plate (1) is connected to a cylinder assembly (22) filled with compressed gas, and the inlet pipe (213) is in communication with the inner side of the cylinder assembly (22); the inner side of the bottom plate (1) is provided with a valve body assembly (23) located on the counterclockwise side of the moving contact assembly (6); the on and off of the inlet pipe (213) and the outlet pipe (212) are both controlled by the valve body assembly (23).

7. An instantaneous trip circuit breaker according to claim 6, characterized in that: When the moving contact assembly (6) is disconnected from the stationary contact assembly (15), the moving contact assembly (6) rotates counterclockwise and pushes the valve body assembly (23) to move and open the air inlet pipe (213) and close the air outlet pipe (212). When the moving contact assembly (6) rotates clockwise and is about to close with the stationary contact assembly (15), the moving contact assembly (6) rotates clockwise and releases the valve body assembly (23) to move and close the air inlet pipe (213) and open the air outlet pipe (212) again.

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