Circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and discloses a circuit breaker. The circuit breaker comprises a base. The operating mechanism is pivoted to the base, and the two moving contacts are both installed on the operating mechanism and are arranged in a spaced mode in the first direction; two static contacts, wherein each static contact corresponds to one moving contact and is arranged opposite to the moving contact; the current protection device can trigger the operation mechanism to act so as to separate the moving contact from the static contact; and the partition plate is connected with the base, and the two moving contacts are located on the two sides of the partition plate respectively. The circuit breaker is simple in structure, short in interelectrode distance, large in creepage distance between the two-phase moving contacts, and good in safety.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a circuit breaker. Background Art

[0002] In low-voltage electrical systems, circuit breakers are widely used as switching devices to protect power supply safety. Circuit breakers are generally composed of a contact system, an arc extinguishing system, an operating mechanism, and an overcurrent protection device. Under normal working conditions, the operating mechanism uses a lever and other transmission mechanisms to keep the contact system closed or open to connect and disconnect the power line. When an overcurrent fault occurs, the overcurrent protection device operates to trip the operating mechanism and quickly cut off the overcurrent.

[0003] In the prior art, some circuit breakers use an operating mechanism to drive the moving contacts of two-phase circuits. This arrangement not only simplifies the circuit breaker structure, but also shortens the inter-pole width of the circuit breaker. However, in this structure, the creepage distance between the two-phase moving contacts is small, and the safety is poor.

[0004] Therefore, a circuit breaker is urgently needed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a circuit breaker which has not only a simple structure and a short pole distance, but also a large creepage distance between two-phase moving contacts and good safety.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Circuit breakers, including:

[0008] Base;

[0009] An operating mechanism is pivotally connected to the base.

[0010] Two moving contacts, both mounted on the operating mechanism, the two moving contacts being spaced apart along a first direction;

[0011] Two stationary contacts, each of which is arranged opposite to one of the moving contacts;

[0012] A current protection device capable of triggering the operating mechanism to separate the moving contact from the stationary contact;

[0013] A partition is connected to the base, and the two moving contacts are respectively located on both sides of the partition.

[0014] Optionally, convex ribs are respectively provided on both sides of the partition, and the convex ribs can limit the moving contact on the corresponding side.

[0015] Optionally, along the first direction, a size of the circuit breaker is 20 mm to 30 mm.

[0016] Optionally, the operating mechanism includes:

[0017] A main lever, pivotally connected to the base;

[0018] A return spring, one end of which is in contact with the main lever, and the other end of which is in contact with the base;

[0019] Two contact support members are arranged opposite to each other along a first direction and are respectively pivotally connected to the main lever, the two contact support members are at least partially located on both sides of the partition, and each of the moving contacts is correspondingly connected to one of the contact support members;

[0020] Two torsion springs, two ends of each torsion spring respectively abut against one of the contact support members and the main lever and provide contact pressure for the corresponding moving contact;

[0021] A jump button, pivotally connected to the main lever;

[0022] A lock catch assembly is pivotally connected to the main lever, a first end of the lock catch assembly is overlapped with the jump catch, and a second end of the lock catch assembly is used to be triggered by the current protection device;

[0023] A reset member has one end connected to the first end of the locking assembly and the other end elastically abuts against the base.

[0024] Optionally, the current protection device includes:

[0025] Two electromagnetic tripping mechanisms are respectively arranged on both sides of the partition, each of the electromagnetic tripping mechanisms is electrically connected to a corresponding static contact, and the top rod of the electromagnetic tripping mechanism can push the lock assembly and the tripping buckle to release, so that the moving contact is separated from the corresponding static contact;

[0026] Bimetallic strips are respectively arranged on both sides of the partition, each of which is electrically connected to a corresponding moving contact, and the bimetallic strips can pull the locking assembly and the tripping buckle to disengage, so that the moving contact is separated from the corresponding static contact.

[0027] Optionally, a first limiting groove and a second limiting groove are formed on both sides of the partition, the first limiting groove is used to limit the electromagnetic tripping mechanism on the corresponding side, and the second limiting groove is used to limit the static contact on the corresponding side.

[0028] Optionally, the locking assembly comprises:

[0029] The first lock catch and the second lock catch are both pivotally connected to the main lever and are spaced apart on both sides of the partition along the first direction. The top rods of the two electromagnetic release mechanisms are respectively opposite to the first lock catch and the second lock catch.

[0030] Optionally, the second lock buckle is connected to the first lock buckle along the first direction, and the first lock buckle is provided with an overlapping portion, which constitutes the first end of the lock buckle assembly and can overlap with the jump buckle.

[0031] Optionally, one of the sides of the first lock buckle and the second lock buckle facing each other is provided with a protrusion, and the other is provided with a socket, and the protrusion is plug-fitted with the socket.

[0032] Optionally, the lock assembly further includes a connecting member, one end of which is connected to the first lock and / or the second lock, and the other end of which is respectively connected to the two bimetallic strips.

[0033] The beneficial effects of the utility model are:

[0034] In the circuit breaker of the utility model, the two moving contacts are both connected to a set of operating mechanisms, so that the operating mechanisms can simultaneously drive the moving contacts in the two-phase circuits, which greatly reduces the width of the two poles and further reduces the overall thickness of the circuit breaker; at the same time, the two moving contacts are located on both sides of the partition, thereby increasing the creepage distance of the two-phase circuit, avoiding the risk of phase-to-phase short circuit, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a circuit breaker provided by a specific implementation method of the utility model;

[0036] Figure 2 It is a structural schematic diagram of a circuit breaker provided by a specific embodiment of the utility model after the cover plate is removed;

[0037] Figure 3 yes Figure 2 A schematic diagram of the structure in another perspective;

[0038] Figure 4 It is a structural schematic diagram of the circuit breaker provided by the specific embodiment of the utility model, with the housing removed and facing the base side;

[0039] Figure 5 It is a top view of a circuit breaker provided by a specific embodiment of the utility model;

[0040] Figure 6 It is a structural schematic diagram of a partition provided by an embodiment of the utility model;

[0041] Figure 7It is a structural schematic diagram of the operating mechanism, bimetallic strip, moving contact and terminal provided by the specific implementation mode of the utility model;

[0042] Figure 8 It is a structural schematic diagram of an integrated module provided by a specific implementation method of the utility model.

[0043] In the figure:

[0044] 10. Shell; 11. Base; 12. Cover;

[0045] 20. partition; 21. first limiting groove; 22. second limiting groove; 23. third limiting groove; 24. plate body; 25. convex rib portion;

[0046] 30. Moving contact;

[0047] 40. Stationary contact;

[0048] 50. operating mechanism; 51. main lever; 52. reset spring; 53. contact support; 54. torsion spring; 55. trip buckle; 56. lock assembly; 561. first lock; 5611. first boss portion; 5612. overlap portion; 5613. jack; 562. second lock; 5621. second boss portion; 563. connector; 57. reset member; 58. operating handle; 501. integrated module;

[0049] 60. Electromagnetic tripping mechanism; 61. Ejector rod;

[0050] 70. Bimetallic strip;

[0051] 80. Arc extinguishing mechanism;

[0052] 90. Wire. DETAILED DESCRIPTION

[0053] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0054] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0056] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0057] This embodiment provides a circuit breaker, which can divide the current when the circuit is overloaded or short-circuited after being connected to the circuit. In this embodiment, the circuit breaker is a two-pole circuit breaker, which can be connected to two-phase circuits respectively and divide the current when any phase circuit is overloaded or short-circuited.

[0058] like Figure 1-Figure 4 As shown, the circuit breaker includes a housing 10 and an operating mechanism 50, two stationary contacts 40, two moving contacts 30, a circuit protection device and two groups of connecting terminals, which are respectively installed in or on the housing 10. Each group of connecting terminals includes two and is used to connect to a phase circuit. The operating mechanism 50 is pivotally connected to the housing 10 and partially extends to the outside of the housing 10 for easy operation by the user. The two moving contacts 30 are both installed on the same operating mechanism 50 and are arranged along a first direction ( Figure 2 The two static contacts 40 are arranged in an interval manner with respect to the two moving contacts 30. The corresponding static contacts 40 and moving contacts 30 are electrically connected to the two wiring terminals of the same group. Two groups of current protection devices are provided, and each group of current protection devices is connected to a phase circuit, so as to perform overcurrent protection on the circuit of the corresponding phase.

[0059] When the circuit breaker is in use, the user can operate the operating mechanism 50 to make the moving contact 30 contact or disconnect with the stationary contact 40, so as to connect or disconnect the circuit of the corresponding phase. Each set of circuit protection devices can trigger the operating mechanism 50 to operate when the circuit of the corresponding phase is overloaded or short-circuited, so as to separate the moving contact 30 from the stationary contact 40, thereby segmenting the current and playing a protective role.

[0060] In this embodiment, the circuit breaker further includes two arc extinguishing mechanisms 80 , and each static contact 40 is correspondingly located in one arc extinguishing mechanism 80 . The arc extinguishing mechanism 80 can extinguish the arc generated when the current is disconnected to avoid damage to the moving contact 30 and the static contact 40 .

[0061] like Figure 3 and Figure 4 As shown, both sets of current protection devices include an electromagnetic tripping mechanism 60 and a bimetallic strip 70. Optionally, in this embodiment, the electromagnetic tripping mechanism 60 is electrically connected between the static contact 40 and the corresponding wiring terminal, and the bimetallic strip 70 is electrically connected between the moving contact 30 and the corresponding wiring terminal. Therefore, the wiring terminal, the bimetallic strip 70, the moving contact 30, the static contact 40, the electromagnetic tripping mechanism 60, and another wiring terminal can be connected in sequence to make the phase circuit conductive. It should be noted that the moving contact 30 and the corresponding bimetallic strip 70 can be electrically connected through a wire 90. When an overload current occurs in the circuit of the corresponding phase, the electromagnetic tripping mechanism 60 acts and triggers the operating mechanism 50 to act, thereby separating the moving contact 30 from the corresponding static contact 40. When a short circuit occurs in the circuit of the corresponding phase, the bimetallic strip 70 acts and triggers the operating mechanism 50 to act, thereby separating the moving contact 30 from the corresponding static contact 40. It should be noted that the electromagnetic tripping mechanism 60 and the bimetallic strip 70 are both existing technologies, and their respective detailed structures and working principles are not described in detail here.

[0062] The circuit breaker of this embodiment can simultaneously drive the moving contacts 30 in two-phase circuits through one operating mechanism 50, thereby greatly reducing the width of the two poles, that is, reducing the thickness of the circuit breaker as a whole. Figure 5 As shown, along the arrangement direction of the two poles (i.e., the first direction), the size of the circuit breaker is B, 20mm≤B≤30mm. In this embodiment, the size of the circuit breaker in the first direction is 24mm, which is 1 / 3 smaller than the 36mm size of the existing assembled circuit breaker operating mechanism. In other embodiments, the size of the circuit breaker can also be 20mm, 21mm, 22mm, 26mm, 28mm, 30mm, etc., which is not specifically limited here.

[0063] like Figure 1 As shown, the housing 10 includes a base 11 and a cover plate 12. The cover plate 12 and the base 11 can be interlocked to enclose a certain accommodating space, and the arc extinguishing mechanism 80, the current protection device, the moving contact 30, the static contact 40 and part of the operating mechanism 50 are all arranged in the accommodating space.

[0064] like Figure 2 and Figure 4As shown, the circuit breaker also includes a partition 20, which is arranged between the base 11 and the cover 12. The two moving contacts 30 are located on both sides of the partition 20. The partition 20 is arranged to increase the creepage distance between the two-phase circuits, avoid the risk of phase-to-phase short circuit, and have higher safety. Optionally, the partition 20 and the housing 10 are both made of insulating materials. The partition 20 can be connected to the base 11 or the cover 12 by fasteners such as screws, and can also be connected to the base 11 or the cover 12 by bonding or other methods, which is not limited here. The side where the operating mechanism 50 extends out of the housing 10 is defined as the upper side. In this embodiment, the partition 20 extends from bottom to top and stops below the operating mechanism 50. The operating mechanism 50 is partially located on the top of the partition 20 and partially located on both sides of the partition 20, so that the moving contacts 30 located on both sides of the partition 20 can be connected to the operating mechanism 50 respectively.

[0065] like Figure 3 and Figure 4 As shown, convex ribs 25 are respectively provided on both sides of the partition 20, and the convex ribs 25 can limit the movable contact 30 on the corresponding side. The provision of the convex ribs 25 can not only limit the corresponding movable contact 30, but also further increase the creepage distance between the two-phase circuits, thereby improving the safety of the circuit breaker. Optionally, the convex ribs 25 are set to a shape that matches the shape of the corresponding position of the movable contact 30, so as to ensure that the convex ribs 25 exert a uniform force on the movable contact 30 when limiting the movable contact 30.

[0066] In this embodiment, two sets of current protection devices are respectively arranged on both sides of the partition 20. Two static contacts 40 are respectively arranged on both sides of the partition 20, and two bimetallic strips 70 are also arranged on both sides of the partition, thereby further ensuring a large creepage distance between the two-phase circuits, avoiding the risk of interphase short circuit, and improving safety.

[0067] Alternatively, if Figure 6 As shown, the first limiting groove 21, the second limiting groove 22 and the third limiting groove 23 are provided on the side of the partition 20 facing the cover plate 12. Among them, the first limiting groove 21 is used to clamp the electromagnetic tripping mechanism 60 on the corresponding side of the limit, and support the electromagnetic tripping mechanism 60. The second limiting groove 22 is used to limit the static contact 40 on the corresponding side, and support the static contact 40. The third limiting groove 23 is used to clamp the arc extinguishing mechanism 80 and support the arc extinguishing mechanism 80. In this embodiment, the partition 20 includes a plate body 24 and ribs protruding from both sides of the plate body 24, and the first limiting groove 21, the second limiting groove 22 and the third limiting groove 23 are formed by the ribs. It should be noted that Figure 6Only the structure of the partition plate 20 facing the cover plate 12 is shown, while the cover plate 12 is also provided with a first limiting groove 21, a second limiting groove 22 and a third limiting groove 23 on the side facing the base 11, so as to limit the electromagnetic tripping mechanism 60, the static contact 40 and the arc extinguishing mechanism 80 on the corresponding side.

[0068] like Figure 2-Figure 4 , Figure 7 As shown, the operating mechanism 50 includes an operating handle 58, a main lever 51, a return spring 52, two contact support members 53 and two torsion springs 54. The operating handle 58 is movably connected to the housing 10 and is in transmission connection with the main lever 51. The main lever 51 is pivoted to the base 11, and the pivot axis between the main lever 51 and the base 11 extends along the first direction. One end of the return spring 52 abuts against the main lever 51, and the other end abuts against the base 11. The two contact support members 53 are arranged opposite to each other along the first direction. One end of the two contact support members 53 is pivoted to both sides of the main lever 51, and the other end of the two contact support members 53 is located on both sides of the partition 20, so that the two moving contacts 30 are connected to the corresponding contact support members 53. Each torsion spring 54 is correspondingly sleeved at the pivot axis of a contact support member 53, and the two free ends of the torsion spring 54 abut against the corresponding contact support member 53 and the main lever 51, thereby providing contact pressure for the corresponding moving contact 30. When the user rotates the operating handle 58, the main lever 51 drives the two contact support members 53 to rotate around the pivot axis of the main lever 51, thereby driving the two moving contacts 30 to abut against the corresponding static contacts 40 to achieve closing. The reset spring 52 is used to provide closing resistance or reset force for the operating mechanism 50 when opening.

[0069] Furthermore, the operating mechanism 50 also includes a jumper 55, a lock assembly 56 and a reset member 57. Among them, the jumper 55 is pivoted to the main lever 51, and the pivot axis of the jumper 55 also extends along the first direction. The operating handle 58 is transmission-connected to the jumper 55, and when the operating handle 58 is operated, the force is transmitted to the main lever 51 through the jumper 55. The lock assembly 56 is pivoted to the main lever 51, and the pivot axis of the lock assembly 56 also extends along the first direction. The first end of the lock assembly 56 overlaps with the jumper 55, and the second end of the lock assembly 56 is used to be triggered by the current protection device. One end of the reset member 57 is connected to the lock assembly 56, and the other end is elastically abutted against the base 11.

[0070] When the circuit breaker is working and both phases are normal, the lock assembly 56 and the trip 55 maintain an overlapping relationship. When any phase circuit is overloaded or short-circuited, the current protection device applies a force to the second end of the lock assembly 56, and the lock assembly 56 rotates around its pivot axis, so that the first end of the lock assembly 56 is disengaged from the trip 55. At this time, the trip 55 loses the constraint of the lock assembly 56, and thus rotates around its own pivot axis, and drives the operating handle 58 and the main lever 51 to move synchronously, thereby driving the moving contact 30 to separate from the corresponding static contact 40, thereby achieving the interruption of abnormal current. The lock assembly 56 is reset under the force provided by the reset member 57, so that when the user subsequently operates the operating handle 58, the trip 55 can achieve the overlap with the first end of the lock assembly 56. Optionally, the reset member 57 can be a component with a certain deformation ability such as a spring or a plastic part.

[0071] In this embodiment, the lock assembly 56 includes a first lock 561 and a second lock 562, both of which are pivotally connected to the main lever 51 and are spaced apart on both sides of the partition 20 along the first direction. The top rods 61 of the two electromagnetic tripping mechanisms 60 are respectively opposite to the first lock 561 and the second lock 562, so that both electromagnetic tripping mechanisms 60 can trigger the operation mechanism 50 to operate. Specifically, when the top rod 61 is extended, it can push the first lock 561 or the second lock 562 to rotate around its pivot axis, thereby causing the lock assembly 56 to be released from the jump buckle 55. In this embodiment, the first lock 561 and the second lock 562 are pivotally connected to the main lever 51 through a pivot axis.

[0072] like Figure 3 As shown, the second lock buckle 562 is connected to the first lock buckle 561 along the first direction, so the first lock buckle 561 and the second lock buckle 562 can act synchronously, no matter whether the first lock buckle 561 is subjected to the force of the current protection device or the second lock buckle 562 is subjected to the force of the current protection device, it can trigger the lock buckle assembly 56 and the jump buckle 55 to achieve tripping, thereby realizing the disconnection of the moving contact 30 and the static contact 40. In this embodiment, a lap joint 5612 is provided on the first lock buckle 561, and the lap joint 5612 constitutes the first end of the lock buckle assembly 56 and can overlap with the jump buckle 55. This arrangement simplifies the structure of the second lock buckle 562 and can also make the overall structure of the circuit breaker more compact. In other embodiments, the lap joint 5612 can also be provided on the second lock buckle 562, as long as it can cooperate with the jump buckle 55.

[0073] Alternatively, if Figure 8As shown, one of the sides of the first lock buckle 561 and the second lock buckle 562 facing each other is provided with a protrusion, and the other is provided with a plug hole 5613, and the protrusion is plugged into the plug hole 5613, so as to realize the connection between the first lock buckle 561 and the second lock buckle 562 in the first direction, and the structure is simple and compact. In other embodiments, the first lock buckle 561 and the second lock buckle 562 can also be connected by fasteners, bonding, or other methods.

[0074] like Figure 7 As shown, the lock assembly 56 also includes a connector 563, one end of which is connected to the first lock 561, and the other end of the connector 563 is respectively connected to the two bimetallic strips 70. Therefore, when an overload current occurs in any phase circuit, the bimetallic strip 70 of the corresponding phase can be deformed and drive the lock assembly 56 and the tripping buckle 55 to be tripped through the connector 563, thereby achieving the disconnection of the moving contact 30 and the static contact 40. In this embodiment, the connector 563 includes three connecting ends, and the three connecting ends are respectively connected to the two bimetallic strips 70 and the first lock 561. In other embodiments, the three connecting ends can also be respectively connected to the two bimetallic strips 70 and the second lock 562, which is not specifically limited here. It should be noted that the specific shape of the connector 563 is not limited.

[0075] like Figure 3 and Figure 4 As shown, a first boss portion 5611 is provided at one end of the first lock buckle 561 close to the corresponding electromagnetic tripping mechanism 60, and the first boss portion 5611 extends along the first direction. By providing the first boss portion 5611, it is ensured that the corresponding electromagnetic tripping mechanism 60 can be reliably pushed to the lock buckle assembly 56. Similarly, a second boss portion 5621 is provided at one end of the second lock buckle 562 close to the corresponding electromagnetic tripping mechanism 60, and the second boss portion 5621 extends along the second direction. By providing the second boss portion 5621, it is ensured that the corresponding electromagnetic tripping mechanism 60 can be reliably pushed to the lock buckle assembly 56.

[0076] When assembling the circuit breaker, Figure 8 As shown, the reset spring 52, the contact support 53 facing the side of the base 11, and the first lock 561 can be installed on the main lever 51 first, and then the reset member 57 can be installed on the first lock 561; then the moving contact 30 is installed on the contact support 53, and the moving contact 30 is connected to the bimetallic strip 70 through the wire 90, and the bimetallic strip 70 is connected to the corresponding terminal. At this time, an integrated module 501 is formed, and then the integrated module 501 is installed as a whole on the base 11. The integrated module 501 as a whole can be assembled in the space outside the circuit breaker, which is convenient for assembly and can improve the assembly efficiency of the circuit breaker.

[0077] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the field, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scopes, and the content of this specification should not be understood as limiting the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A circuit breaker, characterized in that include: Base (11); The operating mechanism (50) is pivotally connected to the base (11). Two moving contacts (30) are both mounted on the operating mechanism (50), and the two moving contacts (30) are spaced apart along a first direction; Two stationary contacts (40), each of the stationary contacts (40) being arranged opposite to one of the moving contacts (30); A current protection device capable of triggering the operating mechanism (50) to operate so as to separate the moving contact (30) from the stationary contact (40); The partition (20) is connected to the base (11), and the two moving contacts (30) are respectively located on both sides of the partition (20).

2. The circuit breaker according to claim 1, characterized in that The two sides of the partition plate (20) are respectively provided with convex ribs (25), and the convex ribs (25) can limit the movable contact (30) on the corresponding side.

3. The circuit breaker according to claim 1, characterized in that: Along the first direction, the size of the circuit breaker is 20 mm to 30 mm.

4. The circuit breaker according to any one of claims 1 to 3, characterized in that: The operating mechanism (50) comprises: A main lever (51) is pivotally connected to the base (11); A return spring (52), one end of which abuts against the main lever (51) and the other end of which abuts against the base (11); Two contact support members (53) are arranged opposite to each other along a first direction and are respectively pivotally connected to the main lever (51); the two contact support members (53) are at least partially located on both sides of the partition (20); and each of the moving contacts (30) is correspondingly connected to one of the contact support members (53); two torsion springs (54), two ends of each torsion spring (54) respectively abutting against a contact support member (53) and the main lever (51) and providing contact pressure for the corresponding moving contact (30); A jump button (55) is pivotally connected to the main lever (51); A lock catch assembly (56) is pivotally connected to the main lever (51), a first end of the lock catch assembly (56) is overlapped with the trip catch (55), and a second end of the lock catch assembly (56) is used to be triggered by the current protection device; A reset member (57) has one end connected to the locking assembly (56) and the other end elastically abuts against the base (11).

5. The circuit breaker according to claim 4, characterized in that The current protection device comprises: Two electromagnetic tripping mechanisms (60) are respectively arranged on both sides of the partition (20), each of the electromagnetic tripping mechanisms (60) is electrically connected to a corresponding static contact (40), and the top rod (61) of the electromagnetic tripping mechanism (60) can push the lock assembly (56) to trip the jumper (55), so as to separate the moving contact (30) from the corresponding static contact (40); Bimetallic strips (70) are respectively arranged on both sides of the partition (20), and each of the bimetallic strips (70) is electrically connected to a corresponding moving contact (30). The bimetallic strips (70) can pull the locking assembly (56) and the tripping latch (55) to disengage, so that the moving contact (30) is separated from the corresponding stationary contact (40).

6. The circuit breaker according to claim 5, characterized in that A first limiting groove (21) and a second limiting groove (22) are formed on both sides of the partition plate (20), the first limiting groove (21) being used to limit the electromagnetic tripping mechanism (60) on the corresponding side, and the second limiting groove (22) being used to limit the static contact (40) on the corresponding side.

7. The circuit breaker according to claim 5, characterized in that The locking assembly (56) comprises: The first lock catch (561) and the second lock catch (562) are both pivotally connected to the main lever (51) and are spaced apart on both sides of the partition (20) along the first direction. The top rods (61) of the two electromagnetic release mechanisms (60) are respectively opposite to the first lock catch (561) and the second lock catch (562).

8. The circuit breaker according to claim 7, characterized in that The second lock buckle (562) is connected to the first lock buckle (561) along the first direction, and the first lock buckle (561) is provided with an overlapping portion (5612), and the overlapping portion (5612) constitutes the first end of the lock buckle assembly (56) and can overlap with the jump buckle (55).

9. The circuit breaker according to claim 8, characterized in that On one side of the first lock buckle (561) and the second lock buckle (562) facing each other, a protrusion is provided on one of them, and a plug hole (5613) is provided on the other, and the protrusion is plug-fitted with the plug hole (5613).

10. The circuit breaker according to claim 7, characterized in that The lock assembly (56) further comprises a connecting member (563), one end of the connecting member (563) being connected to the first lock (561) and / or the second lock (562), and the other end of the connecting member (563) being connected to the two bimetallic strips (70) respectively.

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