A pneumatic protection device for a plastic circuit breaker

Abstract

The present invention relates to the technical field of circuit breaker protection, and discloses a pneumatic protection device for a plastic circuit breaker, which includes a plastic housing. A rotary switch is fixedly connected to the inner wall of the plastic housing. A fixed seat is fixedly connected to the top of the plastic housing. A connector is fixedly connected to the inner wall of the plastic housing. A first fixing block is fixedly connected to the inner wall of the plastic housing. A cylinder is fixedly connected to the inner wall of the first fixing block. A protection mechanism for ventilation is arranged on the inner wall of the plastic housing. The present invention can avoid damage to electrical equipment caused by excessive current when the current exceeds the rated value of the equipment. The disconnection between the test wire and the connector can prevent equipment damage and avoid the risk of fire. Excessive current will cause the electrical equipment and the surrounding materials to heat up. If the current is not cut off in time, it may cause an electrical fire. It can ensure the safety of personnel, avoid the occurrence of electric shock accidents, and prevent the harm of electric arcs.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker protection, and particularly to a pneumatic protection device for a plastic circuit breaker. Background Art

[0002] A plastic circuit breaker, also known as a molded case circuit breaker, is a circuit breaker that houses its contacts, arc extinguishing chamber, tripping device, and operating mechanism within a plastic housing. After long-term use of existing circuit breakers, the internal components may age or be damaged. If not replaced in a timely manner, it will also affect their normal operation.

[0003] The patent with publication number CN109727826B discloses a miniature circuit breaker, which includes a circuit breaker housing, a button mechanism, and an indicating device. The circuit breaker housing includes an indicating hole provided on one side thereof. The button mechanism is slidably engaged with the circuit breaker housing, and the indicating device is drivingly engaged with the button mechanism. When the button mechanism is pressed to close the miniature circuit breaker, the button mechanism drives the indicating device to block the indicating hole. For the miniature circuit breaker of this patent, its indicating device can indicate the closing state of the circuit breaker when the circuit breaker is closed, improving the safety of power use.

[0004] However, during production testing of the above device, generally a voltage higher than the rated voltage is used to conduct power-on detection on it, and this device is difficult to automatically disconnect the power supply, resulting in damage to the internal components of the circuit breaker and affecting the subsequent use of the circuit breaker. Therefore, a pneumatic protection device for a plastic circuit breaker is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pneumatic protection device for a plastic circuit breaker in view of the deficiencies in the above-mentioned prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a pneumatic protection device for a plastic circuit breaker, including a plastic housing, wherein a rotary switch is fixedly connected to the inner wall of the plastic housing, a fixed seat is fixedly connected to the top of the plastic housing, a connector is fixedly connected to the inner wall of the plastic housing, a first fixing block is fixedly connected to the inner wall of the plastic housing, a cylinder is fixedly connected to the inner wall of the first fixing block, a protection mechanism for ventilation is arranged on the inner wall of the plastic housing, a stabilizing mechanism for fixing the circuit is arranged on the inner wall of the fixed seat, a test wire is fixedly connected to the top of the connector, the output end of the cylinder is fixedly connected to a moving block, an L-shaped plate is fixedly connected to the front part of the moving block, a current sensor is fixedly connected to the left side of the connector, the test wire contacts the fixed seat, the moving block is fixedly connected to the surface of the test wire, the L-shaped plate contacts the rotary switch, and the test wire contacts the plastic housing. It can prevent electrical equipment from being damaged by excessive current when the current exceeds the rated value of the equipment. The disconnection of the test wire from the connector can prevent equipment damage and avoid the risk of fire. Excessive current can cause the electrical equipment and the surrounding materials to heat up. If the current is not cut off in time, it may cause an electrical fire, which can ensure the safety of personnel, avoid the occurrence of electric shock accidents, and prevent the harm of electric arcs.

[0007] Preferably, the protection mechanism includes a connecting rod and a closing plate. The connecting rod is fixedly connected to the bottom of the L-shaped plate, and the closing plate is fixedly connected to the bottom of the connecting rod. The protection mechanism further includes a second fixing block, a push rod, a groove block, a first elastic telescopic rod, a push plate, a third fixing block, a protective cover, and a rotating column. The second fixing block is fixedly connected to the front part of the L-shaped plate. The push rod is rotatably connected to the inner wall of the second fixing block. The groove block is fixedly connected to the inner wall of the plastic housing. The rotating column is slidably connected to the inner wall of the groove block. The push rod is rotatably connected to the circumferential surface of the rotating column. The first elastic telescopic rod is fixedly connected to the front part of the plastic housing. The push plate is fixedly connected to the telescopic end of the first elastic telescopic rod. The third fixing block is fixedly connected to the front part of the plastic housing. The protective cover is rotatably connected to the inner wall of the third fixing block. The push rod contacts the groove block. The push plate contacts the protective cover. The closing plate contacts the plastic housing. It can reduce the temperature inside the plastic housing. During the test process, heat is generated when the current passes through. If the heat cannot be dissipated in time, it will cause the temperature of the equipment to rise. High temperature may cause the deformation, aging, and even damage of the housing, affecting the appearance and mechanical performance of the circuit breaker. It ensures that the protective cover cannot be fully opened during the test to avoid direct contact between the operator and the toggle switch. At the same time, when the device is being detected, the protective cover can be rotated to isolate the rotary switch, avoiding electric shock accidents. Closing the protective cover can prevent the operator from accidentally touching the live part during the test process, thus preventing the occurrence of electric shock accidents and improving the safety of the device during use.

[0008] Preferably, the stabilizing mechanism includes a semi-circular fixing block, a connecting block, a moving column, and a push-pull plate. The semi-circular fixing block is fixedly connected to the inner wall of the fixing seat, the connecting block is fixedly connected to the inner wall of the fixing seat, the moving column is slidably connected to the inner wall of the connecting block, the push-pull plate is fixedly connected to the circumferential surface of the moving column. The stabilizing mechanism further includes an elastic telescopic rod II, a pressing plate, an inclined rod, and an inclined groove column. The elastic telescopic rod II is fixedly connected to the inner wall of the fixing seat, the pressing plate is fixedly connected to the telescopic end of the elastic telescopic rod II, the inclined rod is fixedly connected to the bottom of the pressing plate, the inclined groove column is fixedly connected to the inner wall of the push-pull plate. The semi-circular fixing block contacts the test wire, the inclined groove column is slidably connected to the inner wall of the fixing seat, and the inclined groove column contacts the inclined rod, which can prevent the test wire from being deflected by external factors, resulting in the disconnection of the connection between the test wire and the connector of the device, affecting the normal use of the device, improving the stability of the device, enabling the test wire to be further fixed, ensuring the stable connection of the circuit during the test of the device, and improving the safety of the device.

[0009] The present invention adopts the above technical solutions and can bring the following beneficial effects:

[0010] 1. For the pneumatic protection device of the plastic circuit breaker, through the mutual cooperation and movement among the plastic shell, the rotary switch, the fixing seat, the connector, the first fixing block, the cylinder, the test wire, the moving block, the L-shaped plate, and the current sensor, it can prevent electrical equipment from being damaged by excessive current when the current exceeds the rated value of the equipment. The disconnection of the connection between the test wire and the connector can prevent equipment damage and avoid the risk of fire. Excessive current will cause the electrical equipment and the surrounding materials to heat up. If the current is not cut off in time, it may trigger an electrical fire, which can ensure personnel safety, avoid the occurrence of electric shock accidents, and prevent the harm of electric arcs.

[0011] 2. For the pneumatic protection device of the plastic circuit breaker, through the mutual cooperation and movement among the connecting rod, the closing plate, the second fixing block, the push rod, the groove block, the first elastic telescopic rod, the push plate, the third fixing block, the protective cover, and the rotating column, it can reduce the temperature inside the plastic shell. During the test process, heat is generated when the current passes through. If the heat cannot be dissipated in time, it will cause the temperature of the equipment to rise. High temperature may cause the shell to deform, age, or even be damaged, affecting the appearance and mechanical performance of the circuit breaker. It can ensure that the protective cover cannot be completely opened during the test of the device, avoiding direct contact between the operator and the toggle switch. At the same time, when the device is being detected, the protective cover can be rotated to isolate the toggle switch, avoiding electric shock accidents. Closing the protective cover can prevent the operator from accidentally touching the live part during the test process, thus preventing the occurrence of electric shock accidents and improving the safety of the device during use.

[0012] 3. The pneumatic protection device for plastic circuit breaker prevents external factors from moving the test line, causing the connection port of the test line and the connector to be disconnected, affecting the normal use of the device, by coordinating the movements among the semi-arc fixed block, the connecting block, the movable column, the push-pull plate, the elastic telescopic rod 2, the pressure plate, the inclined rod, and the inclined slot column, thereby improving the stability of the device, further fixing the test line, ensuring the stability of the line connection when the device is tested, and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 A half-section view of the plastic housing structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the L-plate structure of the present invention;

[0016] Figure 4 It is a schematic diagram of the structure of the mobile block of the present invention;

[0017] Figure 5 It is a schematic diagram of the protection mechanism of the present invention;

[0018] Figure 6 For the present invention Figure 5 A magnified view of the structure at center;

[0019] Figure 7 This is a schematic diagram of the structure of the semi-arc fixing block of the present invention;

[0020] Figure 8 It is a schematic diagram of the oblique rod structure of the present invention.

[0021] In the figure: 1. plastic shell; 2. rotary switch; 3. fixing seat; 4. connector; 5. fixing block 1; 6. cylinder; 7. protection mechanism; 8. stabilizing mechanism; 9. test line; 10. moving block; 11. L plate; 12. current sensor; 701. connecting rod; 702. closing plate; 703. fixing block 2; 704. pushing rod; 705. slot block; 706. elastic telescopic rod 1; 707. pushing plate; 708. fixing block 3; 709. protective cover; 710. rotating column; 801. semi-arc fixing block; 802. connecting block; 803. moving column; 804. push-pull plate; 805. elastic telescopic rod 2; 806. pressing plate; 807. oblique rod; 808. oblique slot column. DETAILED DESCRIPTION

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-8 , an embodiment of the present invention is: a pneumatic protection device for a plastic circuit breaker, including a plastic housing 1, a rotary switch 2 fixedly connected to the inner wall of the plastic housing 1, a fixed seat 3 fixedly connected to the top of the plastic housing 1, a connector 4 fixedly connected to the inner wall of the plastic housing 1, a first fixing block 5 fixedly connected to the inner wall of the plastic housing 1, a cylinder 6 fixedly connected to the inner wall of the first fixing block 5, a protection mechanism 7 for ventilation provided on the inner wall of the plastic housing 1, a stabilizing mechanism 8 for fixing the circuit provided on the inner wall of the fixed seat 3, a test wire 9 fixedly connected to the top of the connector 4, a moving block 10 fixedly connected to the output end of the cylinder 6, an L-shaped plate 11 fixedly connected to the front of the moving block 10, a current sensor 12 fixedly connected to the left side of the connector 4, the test wire 9 contacting the fixed seat 3, the moving block 10 being fixedly connected to the surface of the test wire 9. When the device is tested, after an operator or a manipulator connects the energized circuit to the device, the device is tested by continuously increasing the current. When the current value reaches the limit, the current sensor 12 at this time will transmit a signal to the console, and then the cylinder 6 will be activated. The output end of the cylinder 6 will drive the moving block 10 to move. After the moving block 10 moves, the moving block 10 will drive the test wire 9 to move. At this time, the test wire 9 is no longer connected to the connector 4, avoiding damage to the electrical equipment caused by excessive current when the current exceeds the rated value of the equipment. The disconnection of the test wire 9 from the connector 4 can prevent equipment damage and avoid the risk of fire. Excessive current will cause the electrical equipment and the surrounding materials to heat up. If the current is not cut off in time, it may trigger an electrical fire. The L-shaped plate 11 contacts the rotary switch 2, and the test wire 9 contacts the plastic housing 1. At the same time, during the movement of the moving block 10, the moving block 10 will drive the L-shaped plate 11 to move. When the L-shaped plate 11 moves, it will squeeze and push the switch button of the rotary switch 2 to close, which can ensure the safety of personnel, avoid the occurrence of electric shock accidents, and prevent the harm of electric arcs.

[0024] The protection mechanism 7 includes a connecting rod 701 and a closing plate 702. The connecting rod 701 is fixedly connected to the bottom of the L-shaped plate 11, and the closing plate 702 is fixedly connected to the bottom of the connecting rod 701. When the device is being tested, the upward movement of the L-shaped plate 11 will drive the movement of the connecting rod 701. While the connecting rod 701 is moving, it will drive the movement of the closing plate 702. During the movement of the closing plate 702, the opening on the surface of the plastic housing 1 will be opened. At this time, the heat inside the plastic housing 1 comes into contact with the outside air, which can reduce the temperature inside the plastic housing 1. During the test, heat is generated when the current passes through. If the heat cannot be dissipated in time, it will cause the temperature of the device to rise. High temperature may cause the deformation, aging, and even damage of the housing, affecting the appearance and mechanical properties of the circuit breaker. The protection mechanism 7 includes a second fixed block 703, a push rod 704, a groove block 705, a first elastic telescopic rod 706, a push plate 707, a third fixed block 708, a protective cover 709, and a rotating column 710. The second fixed block 703 is fixedly connected to the front of the L-shaped plate 11. The push rod 704 is rotatably connected to the inner wall of the second fixed block 703. The groove block 705 is fixedly connected to the inner wall of the plastic housing 1. The rotating column 710 is slidably connected to the inner wall of the groove block 705. The push rod 704 is rotatably connected to the circumferential surface of the rotating column 710. The first elastic telescopic rod 706 is fixedly connected to the front of the plastic housing 1. The push plate 707 is fixedly connected to the telescopic end of the first elastic telescopic rod 706. The third fixed block 708 is fixedly connected to the front of the plastic housing 1. The protective cover 709 is rotatably connected to the inner wall of the third fixed block 708. The push rod 704 contacts the groove block 705, the push plate 707 contacts the protective cover 709, and the closing plate 702 contacts the plastic housing 1. The movement of the closing plate 702 can protect the electronic components inside the device and prevent overheating damage to the device. At the same time, during the upward movement of the L-shaped plate 11, the L-shaped plate 11 will drive the movement of the second fixed block 703. The movement of the second fixed block 703 will drive the movement of the push rod 704. The push rod 704 will drive the movement of the rotating column 710. At this time, the rotating column 710 will slide on the inner wall of the groove block 705. The rotating column 710 will contact and squeeze the push plate 707 to drive the movement of the push plate 707. After the push plate 707 moves, the push plate 707 will somewhat obstruct the rotation and opening of the protective cover 709, ensuring that the protective cover 709 cannot be fully opened when the device is being tested, avoiding direct contact between the operator and the rotating switch 2. At the same time, when the device is being tested, the protective cover 709 can be rotated to isolate the rotating switch 2, avoiding electric shock accidents. Closing the protective cover 709 can prevent the operator from accidentally touching the live part during the test, thus preventing the occurrence of electric shock accidents and improving the safety of the device during use.

[0025] Working principle: When the device is being tested, after the operator or the manipulator connects the energized circuit to the device and makes it conductive, the device is tested by continuously increasing the current. When the current reaches its limit value, the current sensor 12 at this time will transmit a signal to the console, and then the cylinder 6 will be activated. The output end of the cylinder 6 will drive the moving block 10 to move. After the moving block 10 moves, the moving block 10 will drive the test wire 9 to move. At this time, the test wire 9 is no longer connected to the connector 4, preventing damage to the electrical equipment caused by excessive current when the current exceeds the rated value of the equipment. The disconnection of the test wire 9 from the connector 4 can prevent equipment damage and avoid the risk of fire. Excessive current can cause the electrical equipment and the surrounding materials to heat up. If the current is not cut off in time, it may trigger an electrical fire. At the same time, during the movement of the moving block 10, the moving block 10 will drive the L-shaped plate 11 to move. When the L-shaped plate 11 moves, it will squeeze and push the switch button of the rotary switch 2 to close, which can ensure personnel safety, avoid electric shock accidents, and prevent the harm of electric arcs.

[0026] When the device is being tested, the upward movement of the L-shaped plate 11 will drive the connecting rod 701 to move. While the connecting rod 701 is moving, it will drive the closing plate 702 to move. During the movement of the closing plate 702, it will open the opening on the surface of the plastic housing 1, allowing the heat inside the plastic housing 1 to come into contact with the outside air, which can reduce the temperature inside the plastic housing 1. During the test, heat is generated when the current passes through. If the heat cannot be dissipated in time, it will cause the temperature of the device to rise. High temperature may cause the housing to deform, age, or even be damaged, affecting the appearance and mechanical performance of the circuit breaker. The movement of the closing plate 702 can protect the electronic components inside the device and prevent overheating damage to the device. At the same time, during the upward movement of the L-shaped plate 11, the L-shaped plate 11 will drive the second fixed block 703 to move. The movement of the second fixed block 703 will drive the push rod 704 to move. The push rod 704 will drive the rotating column 710 to move. At this time, the rotating column 710 will slide on the inner wall of the groove block 705. The rotating column 710 will contact and squeeze the push plate 707 to drive the push plate 707 to move. After the push plate 707 moves, the push plate 707 will somewhat obstruct the rotation and opening of the protective cover 709, ensuring that the protective cover 709 cannot be fully opened when the device is being tested, preventing direct contact between the operator and the rotary switch 2. At the same time, when the device is being tested, the protective cover 709 can be rotated to isolate the rotary switch 2, avoiding electric shock accidents. Closing the protective cover 709 can prevent the operator from accidentally touching the energized part during the test, thus preventing the occurrence of electric shock accidents and improving the safety of the device during use.

[0027] Please refer to Figures 1-8On the basis of the above embodiment, in another embodiment of the present invention, the stabilizing mechanism 8 includes a semi-arc fixing block 801, a connecting block 802, a moving column 803, and a push-pull plate 804. The semi-arc fixing block 801 is fixedly connected to the inner wall of the fixing seat 3, the connecting block 802 is fixedly connected to the inner wall of the fixing seat 3, the moving column 803 is slidably connected to the inner wall of the connecting block 802, and the push-pull plate 804 is fixedly connected to the circumferential surface of the moving column 803. Before the device is used, the operator connects the test line 9 to the connector 4. At this time, the operator pushes the push-pull plate 804 to move, and the movement of the push-pull plate 804 will drive the moving column 803 to move. At this time, the moving column 803 will push the test line 9 to move through its own arc plate. At this time, the test line 9 will be fixed between the semi-arc fixing block 801 and the moving column 803, so as to avoid external factors from moving the test line 9, resulting in the disconnection of the connection port between the test line 9 and the connector 4, affecting the normal use of the device, and improving the stability of the device. 8 also includes an elastic telescopic rod 805, a pressure plate 806, an inclined rod 807, and an inclined slot column 808. The elastic telescopic rod 805 is fixedly connected to the inner wall of the fixing seat 3, the pressure plate 806 is fixedly connected to the telescopic end of the elastic telescopic rod 805, the inclined rod 807 is fixedly connected to the bottom of the pressure plate 806, the inclined slot column 808 is fixedly connected to the inner wall of the push-pull plate 804, the semi-arc fixed block 801 contacts the test line 9, the inclined slot column 808 is slidably connected to the inner wall of the fixing seat 3, and the inclined slot column 80 8 contacts with the inclined rod 807. When the operator pushes the push-pull plate 804, the push-pull plate 804 will drive the inclined slot column 808 to move, and the inclined slot column 808 will slide on the inner wall of the fixing seat 3. After the inclined slot column 808 moves a certain distance, the inclined rod 807 will enter the groove of the inclined slot column 808 through the inclined surface. At this time, the inclined slot column 808 cannot be pushed or pulled, which can further fix the test line 9, ensure the stability of the line connection when the device is tested, and improve the safety of the device.

[0028] Working principle: before the device is used, the operator connects the test line 9 to the connector 4. At this time, the operator pushes the push-pull plate 804 to move. The movement of the push-pull plate 804 will drive the moving column 803 to move. At this time, the moving column 803 will push the test line 9 to move through its own arc plate. At this time, the test line 9 will be fixed between the semi-arc fixed block 801 and the moving column 803 to avoid external factors from moving the test line 9, resulting in the disconnection of the connection port between the test line 9 and the connector 4, affecting the normal use of the device and improving the stability of the device. When the operator pushes the push-pull plate 804, the push-pull plate 804 will drive the inclined groove column 808 to move, and the inclined groove column 808 will slide on the inner wall of the fixed seat 3. After the inclined groove column 808 moves a certain distance, the inclined rod 807 will enter the groove of the inclined groove column 808 through the inclined surface. At this time, the inclined groove column 808 cannot be pushed or pulled, which can further fix the test line 9, ensure the stability of the line connection when the device is tested, and improve the safety of the device.

[0029] The present invention provides a pneumatic protection device for a plastic circuit breaker. There are many methods and ways to specifically implement this technical solution. The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented by the prior art.

Claims

1. A pneumatic protection device for a plastic circuit breaker, comprising a plastic housing (1), characterized in that: The inner wall of the plastic housing (1) is fixedly connected with a rotary switch (2), the top of the plastic housing (1) is fixedly connected with a fixed seat (3), the inner wall of the plastic housing (1) is fixedly connected with a connector (4), the inner wall of the plastic housing (1) is fixedly connected with a first fixing block (5), the inner wall of the first fixing block (5) is fixedly connected with a cylinder (6), a protection mechanism (7) for ventilation is arranged on the inner wall of the plastic housing (1), a stability mechanism (8) for fixing a circuit is arranged on the inner wall of the fixed seat (3), a test wire (9) is fixedly connected to the top of the connector (4), the output end of the cylinder (6) is fixedly connected with a moving block (10), an L-shaped plate (11) is fixedly connected to the front part of the moving block (10), and a current sensor (12) is fixedly connected to the left side of the connector (4); The test wire (9) is in contact with the fixed seat (3), the moving block (10) is fixedly connected to the surface of the test wire (9), the L-shaped plate (11) is in contact with the rotary switch (2), and the test wire (9) is in contact with the plastic housing (1); The protection mechanism (7) includes a connecting rod (701) and a closing plate (702), the connecting rod (701) is fixedly connected to the bottom of the L-shaped plate (11), and the closing plate (702) is fixedly connected to the bottom of the connecting rod (701); The protection mechanism (7) includes a second fixing block (703), a push rod (704), a groove block (705), a first elastic telescopic rod (706), a push plate (707), a third fixing block (708), a protective cover (709), and a rotating column (710). The second fixing block (703) is fixedly connected to the front part of the L-shaped plate (11), the push rod (704) is rotatably connected to the inner wall of the second fixing block (703), the groove block (705) is fixedly connected to the inner wall of the plastic housing (1), the rotating column (710) is slidably connected to the inner wall of the groove block (705), the push rod (704) is rotatably connected to the circumferential surface of the rotating column (710), the first elastic telescopic rod (706) is fixedly connected to the front part of the plastic housing (1), the push plate (707) is fixedly connected to the telescopic end of the first elastic telescopic rod (706), the third fixing block (708) is fixedly connected to the front part of the plastic housing (1), and the protective cover (709) is rotatably connected to the inner wall of the third fixing block (708); The push rod (704) is in contact with the groove block (705), the push plate (707) is in contact with the protective cover (709), and the closing plate (702) is in contact with the plastic housing (1).

2. The pneumatic protection device for a plastic circuit breaker according to claim 1, wherein: The stability mechanism (8) includes a semi-circular fixing block (801), a connecting block (802), a moving column (803), and a push-pull plate (804). The semi-circular fixing block (801) is fixedly connected to the inner wall of the fixed seat (3), the connecting block (802) is fixedly connected to the inner wall of the fixed seat (3), the moving column (803) is slidably connected to the inner wall of the connecting block (802), and the push-pull plate (804) is fixedly connected to the circumferential surface of the moving column (803).

3. The pneumatic protection device for a plastic circuit breaker according to claim 2, characterized in that: The stabilizing mechanism (8) further includes an elastic telescopic rod II (805), a pressing plate (806), an inclined rod (807), and an inclined groove column (808). The elastic telescopic rod II (805) is fixedly connected to the inner wall of the fixed seat (3). The pressing plate (806) is fixedly connected to the telescopic end of the elastic telescopic rod II (805). The inclined rod (807) is fixedly connected to the bottom of the pressing plate (806). The inclined groove column (808) is fixedly connected to the inner wall of the push-pull plate (804).

4. The pneumatic protection device for a plastic circuit breaker according to claim 3, wherein: The semi-circular fixing block (801) contacts the test wire (9). The inclined groove column (808) is slidably connected to the inner wall of the fixed seat (3). The inclined groove column (808) contacts the inclined rod (807).

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