Circuit breaker with anti-misoperation closing function

Abstract

The utility model relates to a circuit breaker with mistaken closing prevention function belongs to low pressure technical field, including handle, drive handle to carry out the switching operation of circuit breaker, characterized by: the circuit breaker still includes a limiting device, and the limiting device includes an electromagnet and a limiting piece driven by the electromagnet, when the limiting piece is located at the first position, the limiting piece is located on the movement track of the handle, and the handle is stopped to the closing position movement, when the electromagnet drives the limiting piece to act to the second position, the limiting piece is located outside the movement track of the handle, and the handle is allowed to move to the closing position. Advantage: the circuit breaker only receives the closing signal, and allows the closing operation to the handle, realizes the closing of the circuit breaker, and reaches the purpose of accurate closing operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-voltage electrical apparatus, and particularly relates to a circuit breaker with anti-misoperation closing function. BACKGROUND

[0002] Moulded case circuit breakers are widely used in low-voltage power supply and distribution systems due to their excellent protection characteristics. The moulded case circuit breaker comprises a housing, in which are arranged operating mechanisms, contact assemblies, arc extinguishing systems and other components of the circuit breaker. The circuit breaker also has a handle, which has an operating knob part exposed outside the housing and a driving part connected with the operating mechanism in the housing. The handle is exposed outside the housing through an operating hole formed in the housing, thereby facilitating operation.

[0003] The opening and closing actions of the moulded case circuit breaker are performed by pulling the handle. The opening and closing actions of the circuit breaker can be performed by an electric operating system or manually. When manually operated, the operator can pull the operating knob part of the handle to drive the operating mechanism in the circuit breaker, thereby realizing the opening operation, closing operation and reclosing operation after automatic tripping of the circuit breaker.

[0004] Under a complex power grid topology, the circuit breaker must receive a closing instruction to be closed. To meet this requirement, a circuit breaker with anti-misoperation closing function is designed to avoid misoperation.

[0005] In view of the above prior art, it is necessary to reasonably improve the structure of the existing circuit breaker. Therefore, the technical solution to be introduced below is produced in this background. SUMMARY

[0006] The present application aims to provide a circuit breaker with anti-misoperation closing function, which allows the closing operation of the handle only when a closing signal is received, realizes the closing of the circuit breaker, and achieves the purpose of accurate closing operation.

[0007] The present application is accomplished in the following manner. A circuit breaker with anti-misoperation closing function comprises a handle for driving the opening and closing operations of the circuit breaker. The circuit breaker further comprises a limiting device, which comprises an electromagnet and a limiting member driven by the electromagnet. When the limiting member is located at a first position, the limiting member is located on the movement track of the handle and stops the handle from moving to the closing position. When the electromagnet drives the limiting member to move to a second position, the limiting member is located outside the movement track of the handle and allows the handle to move to the closing position.

[0008] In a specific embodiment of the present application, a driving rod is arranged between the limiting member and the electromagnet. One end of the driving rod is matched with the electromagnet, and the other end is connected with the limiting member.

[0009] In one specific embodiment of the present application, the driving rod and the limiting member are connected through shaft and groove matching.

[0010] In one specific embodiment of the present application, the limiting device is an internal accessory of the circuit breaker, the limiting member is composed of a limiting plate slidingly arranged in the housing of the circuit breaker, the electromagnet is fixed in the housing, the driving rod is rotatably arranged in the housing, the elastic member is arranged between the driving rod and the housing, the housing is provided with a stopper one, the driving rod keeps the limiting member in a tendency of moving towards the stopper one under the action of the elastic member, and the limiting member is in the first position abutting against the stopper one or abutting against the handle.

[0011] In one specific embodiment of the present application, the limiting device is an external accessory of the circuit breaker, the limiting device further comprises a housing fixed outside the circuit breaker and located at one side of the handle, the limiting member is composed of a limiting rod, the housing is provided with a through hole for the reciprocating movement of the limiting member, the electromagnet is fixed in the housing, the driving rod is rotatably arranged in the housing, the elastic member is arranged between the driving rod and the housing, the housing is provided with a stopper two, the driving rod keeps the limiting member in a tendency of moving out of the housing under the action of the elastic member, the limiting member is in the first position when the driving rod is under the action of the elastic member and the stopper two, at this time, the limiting member extends out of the housing; when the electromagnet acts on the driving rod, the limiting member is in the second position, at this time, the limiting member is retracted into the housing.

[0012] In one specific embodiment of the present application, the handle follower plate is arranged between the stopper two and the housing, the handle follower plate can follow the movement of the handle, and the handle follower plate blocks the movement of the limiting member to the first position under the action of the elastic member when the handle is away from the opening position.

[0013] In one specific embodiment of the present application, the housing is further provided with a movement hole along the movement track of the handle, and the handle follower is hinged to the handle through a follower shaft, the follower shaft can move in the movement hole following the handle.

[0014] In one specific embodiment of the present application, the elastic member is a torsion spring, the middle part of the torsion spring is sleeved on the rotating shaft of the driving rod, and the two spring legs of the elastic member abut against the driving rod and the housing respectively.

[0015] In one specific embodiment of the present application, the elastic member is a torsion spring, the middle part of the torsion spring is sleeved on the rotating shaft of the driving rod, and the two spring legs of the elastic member abut against the driving rod and the housing respectively.

[0016] The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0018] Figure 2 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0019] Figure 3 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0020] Figure 4 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured. Figure 3

[0021] Figure 5 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0022] Figure 6 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0023] Figure 7 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0024] Figure 8 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0025] Figure 9 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured.

[0026] Figure 10 The application has the beneficial effects that: first, the limiting piece in the technical solution is located on the movement path of the handle when being in the first position, and the handle is stopped from moving to the closed position; the limiting piece is located outside the movement track of the handle when being in the second position, and the handle is allowed to move to the closed position, so that the handle is allowed to be closed only when the closing signal is received, and the circuit breaker is closed to achieve the purpose of accurate closing operation; second, the structure is sensitive to the closing signal and avoids the generation of misoperation, and the safety of the circuit breaker is ensured. Figure 9 ​​

[0027] Figure 11 Figure 3 is a schematic view of the external structure of the cover when the limiting member is in the second position according to another embodiment of the circuit breaker.

[0028] Figure 12 Figure 4 is a C-C sectional view of the circuit breaker. Figure 11

[0029] Figure 1: 1. housing, 11. operation hole, 12. stopper one, 13. sliding rail, 14. rotating shaft, 15. limiting wall; 100. base, 200. cover, 201. small cover; 2. handle; 3. limiting member, 31. connecting shaft, 32. flange; 4. driving rod, 41. elastic member, 411. spring foot one, 412. spring foot two, 42. long slot; 5. electromagnet, 51. moving core, 511. top rod, 52. static core, 53. spring, 54. coil; 300. cover, 301. movement hole, 302. through hole, 303. stopper two; 6. handle follow-up plate, 61. follow-up shaft. DETAILED DESCRIPTION

[0030] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings, but the description of the embodiments by the applicant is not a limitation on the technical solutions, and any formal but not substantial changes made according to the concept of the present application should be considered as the protection scope of the present application.

[0031] In the following description, any directional or positional concepts such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and therefore should not be understood as a special limitation on the technical solutions provided by the present application.

[0032] Please refer to Figure 1 , Figure 2 The present application relates to a circuit breaker with a misoperation prevention function, comprising a housing 1, which is usually composed of a base 100 and a cover 200, and the cover 200 is placed on the base 100. The housing 1 is internally provided with operating mechanisms, contact assemblies, arc extinguishing systems and other components of the circuit breaker. The circuit breaker also has a handle 2, which has an operating handle part exposed outside the housing 1 and a driving part connected with the operating mechanism inside the housing 1, and the handle 2 is exposed to the housing 1 through the operation hole 11 formed on the cover 200.

[0033] As Figure 1 , Figure 2 ​As shown, the operator can drive the internal operating mechanism of the circuit breaker by operating the handle part of the handle 2, realizing the circuit breaker's opening, closing, and re-clamping operations after automatic tripping. Corresponding to the circuit breaker's opening and closing states, the handle 2 also has an opening position and a closing position relative to the housing 1. In addition, the handle 2 also has a tripping position and a re-clamping position relative to the housing 1. The tripping position refers to the position where, when a line fault occurs, the circuit breaker automatically trips, causing the handle to reach the tripping position. The re-clamping position refers to the position where, after the circuit breaker has tripped, if closing is required, the circuit breaker needs to be re-clamped. This position is unstable, close to the opening position; after the re-clamping action is completed, the handle will stabilize in the opening position. Therefore, the operating hole 11 is a rectangular slot to accommodate the movement of the handle 2 between the re-clamping action, the opening position, the tripping position, and the closing position.

[0034] like Figures 2 to 6 As shown, to prevent the handle 2 from erroneously performing the closing action and causing a safety accident, this patent proposes a limiting device, including a limiting member 3 and an electromagnet 5. The limiting member 3 is driven by the electromagnet 5. When the limiting member 3 is in the first position, it is located on the movement trajectory of the handle 2, stopping the handle 2 from moving towards the closing position. When the electromagnet 5 actuates and drives the limiting member 3 to the second position, the limiting member 3 is located outside the movement trajectory of the handle 2, allowing the handle 2 to move towards the closing position. Furthermore, a driving rod 4 can be provided between the limiting member 3 and the electromagnet 5, with one end cooperating with the electromagnet 5 and the other end connected to the limiting member 3. When the electromagnet 5 actuates, it drives the driving rod 4, which in turn moves the limiting member 3 from the first position to the second position, i.e., outside the movement trajectory of the handle 2. Furthermore, the drive rod 4 and the limiting member 3 are connected by a shaft and groove. Specifically, one end of the drive rod 4 is provided with a long groove 42, and the limiting member 3 is provided with a connecting shaft 31, which is accommodated in the long groove 42.

[0035] The following embodiments provide a detailed description of the structure of the circuit breaker's anti-misoperation handle 2.

[0036] Example 1

[0037] In this embodiment, the limiting device is an internal accessory of the circuit breaker, meaning that all components that prevent accidental closing are located inside the circuit breaker. A small cover 201 can be separately installed on the upper part of the cover 200 to seal the aforementioned components; alternatively, the small cover 201 can be integrally formed with the cover 200. In this embodiment, the limiting member 3 is composed of a limiting plate that slides within the cover 200.

[0038] like Figure 3 , Figure 4As shown, the inner surface of the small cover 201 in the embodiment is provided with a sliding rail 13 for guiding the movement of the limiting member 3. In the embodiment, the sliding direction of the limiting member 3 in the sliding groove formed by the sliding rail 13 is perpendicular to the movement direction of the handle 2 in the operation hole 11.

[0039] As shown in Figures 3 to 6 , the driving rod 4 has a counterclockwise rotating tendency under the action of the elastic member 41. When the handle 2 is in the open position, the driving rod 4 moves counterclockwise under the action of the elastic member 41, thereby driving the limiting member 3 connected thereto to move left, and the limiting member 3 is limited by the stopper one 12 provided on the cover 200. In order to ensure effective stopping, the left end of the limiting member 3 is provided with a flange 32, as shown in Figure 3 and Figure 5 , the flange 32 is used to cooperate with the stopper one 12. At this time, the limiting member 3 is located at the first position, i.e. stopped in front of the handle 2 in the closing direction, blocking the movement of the handle 2 in the closing position direction, preventing the closing operation.

[0040] As shown in Figure 4 , the elastic member 41 in the embodiment is a torsion spring, the middle part of which is sleeved on the rotating shaft 14 of the driving rod 4, and a limiting wall 15 is fixed in the small cover 201 close to the rotating shaft 14. The two spring legs of the elastic member 41 are spring leg one 411 abutting against the driving rod 4 and spring leg two 412 abutting against the limiting wall 15, respectively.

[0041] As shown in Figure 3 , Figure 5 , Figure 6 , the electromagnet 5 inside the circuit breaker is fixed on the limiting wall 15, which is not limited to the above fixing mode, as long as it is fixed in the small cover 201 and can act on the driving rod 4. The electromagnet 5 includes a moving iron core 51, a static iron core 52, a coil 54, and a spring 53 arranged between the moving iron core 51 and the static iron core 52, as shown in Figure 6 , the left end of the moving iron core 51 is provided with a top rod 511 for acting on the driving rod 4.

[0042] Please continue to refer to Figures 1 to 6 , the working process of the circuit breaker with anti-misoperation closing function in the embodiment is as follows:

[0043] As shown in Figure 3 , under the action of the elastic member 41, the driving rod 4 acts on the connecting shaft 31 of the limiting member 3, and the flange 32 of the limiting member 3 abuts against the stopper one 12. At this time, the limiting member 3 is located at the first position, and the limiting member 3 is located on the movement track of the handle 2, stopping the handle 2 from moving to the closing position.

[0044] When the fault collection system judges that the line is normal and sends a closing signal, the coil 54 of the electromagnet 5 is energized, the moving iron core 51 is attracted to the static iron core 52 against the action of the spring 53, the top rod 511 pushes the driving rod 4 against the action of the elastic member 41, the driving rod 4 rotates clockwise, and the limiting member 3 is moved to the right, exits the operation hole 11, and reaches the second position. The limiting member 3 is located outside the movement track of the handle 2, allowing the handle 2 to move to the closing position, and the user can operate the handle 2 to close. During the movement of the handle 2 to the closing position, when the handle 2 is located in the operation hole 11 after leaving the opening position, the handle 2 blocks the movement of the limiting member 3 to the first position under the action of the elastic member 41. Even if the closing signal disappears and the pushing force of the electromagnet 5 is eliminated, the limiting member 3 will not be extended below the operation hole 11 under the action of the elastic member 41 and the driving rod 4, but will be in abutment with the handle 2. Therefore, the handle 2 has left the opening position, and the handle 2 can freely move between other positions except the opening position due to the counter-stop of the handle 2 to the limiting member 3, realizing normal operation of the circuit breaker. When the handle 2 is operated to the opening position, the limiting member 3 loses the counter-stop of the handle 2, and under the action of the elastic member 41 on the driving rod 4, the limiting member 3 automatically returns to the first position, i.e., is located in the movement track of the handle 2 moving to the closing position.

[0045] According to the structure of Embodiment 1, the action of the electromagnet 5 on the limiting member 3 is not limited to the above-mentioned transmission action through the driving rod 4. The stability of the limiting member 3 in the first position is not limited to the above-mentioned way of the stopper 12, but can also be achieved by setting a stopper block on the cover 200 to act on the driving rod 4. The setting position of the electromagnet 5 is not limited to the above-mentioned cover 200, but can be on the base 100 or other positions of the shell 1.

[0046] Embodiment 2

[0047] The limiting device of this embodiment is an external accessory of the circuit breaker. The limiting device has a shell 300, and all components for realizing the anti-closing function are arranged inside the shell 300, while the shell 300 is fixed outside the circuit breaker, specifically on the cover 200 and on one side of the handle 2. Figure 7 、 Figure 8 、 Figure 10 、 Figure 12As shown, the limiting member 3 is composed of a limiting rod, the shell 300 is provided with a through hole 302 for the reciprocating movement of the limiting member 3, and a movement hole 301 is provided along the movement track of the handle 2. The electromagnet 5 is fixed in the shell 300, the driving rod 4 is rotationally arranged in the shell 300, and the elastic member 41 is arranged between the driving rod 4 and the shell 300. The connection mode of the electromagnet 5 and the driving rod 4 is the same as that of the first embodiment. The elastic member 41 of the present embodiment is also a torsion spring, the middle part of which is sleeved on the rotating shaft 14 of the driving rod 4, and the limiting wall 15 is fixed at a position close to the rotating shaft 14 in the shell 300. The two spring legs of the elastic member 41 abut against the driving rod 4 and the limiting wall 15 respectively. The shell 300 is provided with a second stop member 303, and the handle follower plate 6 is arranged between the second stop member 303 and the shell 300. The handle follower plate 6 is hinged to the handle 2 through the follower shaft 61, and the follower shaft 61 can move in the movement hole 301 following the handle 2. The driving rod 4 keeps the limiting member 3 in the movement trend of extending out of the shell 300 under the action of the elastic member 41. When the driving rod 4 is under the action of the elastic member 41 and the second stop member 303, the limiting member 3 is in the first position, and at this time, the limiting member 3 extends out of the shell 300. When the electromagnet 5 acts on the driving rod 4, the limiting member 3 retracts into the shell 300, and the limiting member 3 is in the second position. The remaining components and the connection structure between them of the present embodiment are the same as those of the first embodiment.

[0048] Please continue to refer to Figures 7 to 12 The working process of the circuit breaker with the anti-false closing function of the present embodiment is as follows:

[0049] As shown in Figure 9 , Figure 10 , under the action of the elastic member 41, the end of the driving rod 4 connected with the limiting member 3 abuts against the second stop member 303, at this time, the limiting member 3 is in the first position, the limiting member 3 extends out of the shell 300, and the limiting member 3 is located on the movement track of the handle 2. The handle 2 moves to the closing position, at this time, the handle follower plate 6 is located at the left position shown in Figure 10 .

[0050] When the fault collection system judges that the line is normal and issues a closing signal, the coil 54 of the electromagnet 5 is energized, the moving iron core 51 overcomes the action of the spring 53 and is attracted to the static iron core 52, the top rod 511 pushes the driving rod 4 to overcome the action of the elastic member 41, and the driving rod 4 rotates counterclockwise at the position shown in Figure 10 , driving the limiting member 3 to move downward and retract into the shell 300. The limiting member 3 reaches the second position, as shown in Figure 12 , the limiting member 3 is located outside the movement track of the handle 2, allowing the handle 2 to move to the closing position. The user can operate the handle 2 to close. In the process of moving the handle 2 to the closing position or when the handle 2 reaches the closing position, ifFigure 11 , Figure 12 As shown in Fig. 6, when the handle 2 is in the closed position, the handle follower plate 6 is in the left position, and the limiting member 3 is in the second position. When the handle 2 is in the open position, the handle follower plate 6 is in the right position, and the limiting member 3 is in the first position. When the handle 2 is in the closed position, the handle follower plate 6 is in the left position, and the limiting member 3 is in the second position. When the handle 2 is in the open position, the handle follower plate 6 is in the right position, and the limiting member 3 is in the first position.

Claims

1. A circuit breaker with anti-pumping function, comprising a handle (2), a drive handle (2) to drive the opening and closing operation of the circuit breaker, characterized in that: The circuit breaker further comprises a limiting device, the limiting device comprises an electromagnet (5) and a limiting member (3) driven by the electromagnet, when the limiting member (3) is in the first position, the limiting member (3) is located on the movement track of the handle (2) and stops the handle (2) from moving to the closed position; when the electromagnet (5) drives the limiting member (3) to the second position, the limiting member (3) is located outside the movement track of the handle (2) and allows the handle (2) to move to the closed position; a driving rod (4) is arranged between the limiting member (3) and the electromagnet (5), one end of the driving rod (4) is matched with the electromagnet (5) and the other end is connected with the limiting member (3); the limiting device is an internal accessory of the circuit breaker, the limiting member (3) is composed of a limiting plate which is slidably arranged in the shell (1) of the circuit breaker, the electromagnet (5) is fixed in the shell (1), the driving rod (4) is rotatably arranged in the shell (1), an elastic member (41) is arranged between the driving rod (4) and the shell (1), a stopper one (12) is arranged on the shell (1), the driving rod (4) makes the limiting member (3) keep the tendency of moving to the stopper one (12) under the action of the elastic member (41) and makes the limiting member (3) be in the first position or abut against the handle (2); or the limiting device is an external accessory of the circuit breaker, the limiting device further comprises a shell cover (300) which is fixed outside the circuit breaker and located on one side of the handle (2), the limiting member (3) is composed of a limiting rod, a through hole (302) for the reciprocating movement of the limiting member (3) is arranged on the shell cover (300), the electromagnet (5) is fixed in the shell cover (300), the driving rod (4) is rotatably arranged in the shell cover (300), an elastic member (41) is arranged between the driving rod (4) and the shell cover (300), a stopper two (303) is arranged on the shell cover (300), the driving rod (4) makes the limiting member (3) keep the tendency of extending out of the shell cover (300) under the action of the elastic member (41), when the driving rod (4) is under the action of the elastic member (41) and the stopper two (303), the limiting member (3) is in the first position, at this time, the limiting member (3) extends out of the shell cover (300); when the electromagnet (5) acts on the driving rod (4), at this time, the limiting member (3) is retracted into the shell cover (300), the limiting member (3) is in the second position.

2. The circuit breaker with anti-pumping function according to claim 1, characterized in that The driving rod (4) and the limiting member (3) are connected through the shaft and groove matching.

3. The circuit breaker with anti-pumping function according to claim 1, characterized in that A handle follow-up plate (6) is arranged between the stopper two (303) and the shell cover (300), the handle follow-up plate (6) can follow the movement of the handle (2), when the handle (2) is away from the open position, the handle follow-up plate (6) blocks the movement of the limiting member (3) to the first position under the action of the elastic member (41).

4. The circuit breaker with anti-pumping function according to claim 3, characterized in that A movement hole (301) is further arranged on the shell cover (300) along the movement track of the handle (2), the handle follow-up plate (6) is located in the movement hole (301) The plate (6) is hinged with the handle (2) through a follow-up shaft (61), which can follow the handle (2) to move in the movement hole (301).

5. The circuit breaker with anti-pumping function according to claim 1, characterized in that The elastic member (41) is a torsion spring, the middle part of which is sleeved on the rotating shaft (14) of the driving rod (4), and two spring legs of the elastic member (41) are respectively abutted on the driving rod (4) and the shell (1).

6. The circuit breaker with anti-pumping function according to claim 1, characterized in that The elastic member (41) is a torsion spring, the middle part of which is sleeved on the rotating shaft (14) of the driving rod (4), and two spring legs of the elastic member (41) are respectively abutted on the driving rod (4) and the shell (1).

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