A circuit breaker

Abstract

The utility model provides a circuit breaker relates to electrical equipment technical field. Circuit breaker includes base, arc extinguishing chamber, dynamic contact subassembly and static contact subassembly, and arc extinguishing chamber is provided with arc extinguishing chamber, dynamic contact subassembly includes first dynamic contact head and second dynamic contact head, and one end of first dynamic contact head is set up in base movably, and other end is provided with first dynamic contact point and is inserted into arc extinguishing chamber, and second dynamic contact head is located outside arc extinguishing chamber, static contact subassembly includes static guide plate and first static contact head and second static contact head all with static guide plate is connected, and first static contact head includes first section and second section of bended structure, and one end of first section is connected with static guide plate, and other end is connected with second section, and second section is provided with first static contact point, and this structure is advantageous to the quick guidance and extinguishing of arc, and has promoted the breaking capacity and operating reliability of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to a circuit breaker. Background Technology

[0002] Circuit breakers, as key devices in power systems used to protect circuits, primarily function to connect and disconnect circuits under normal or fault conditions, thereby ensuring the safe operation of electrical equipment and lines. Among these components, the contact system, as one of the core components of a circuit breaker, directly affects the circuit breaker's breaking performance, electrical life, and operational reliability through its structural design.

[0003] In existing technologies, many circuit breakers employ a combination structure of "short contacts + long contacts," where the short contacts carry the operating current and the long contacts are used to initiate the arc. This structure improves current carrying capacity and initial arc guiding effect to some extent. However, due to unreasonable contact structure design or obstructed arc extinguishing paths in existing systems, the arc is difficult to be quickly introduced into the arc extinguishing chamber, and phenomena such as arc retention and reignition may occur, affecting the circuit breaker's breaking speed and stability. In severe cases, this can even lead to equipment damage or safety accidents. Utility Model Content

[0004] This utility model provides a circuit breaker with a reasonable structural design, which is conducive to the rapid guidance and extinguishing of electric arc, thereby improving the breaking performance and operational reliability of the circuit breaker.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a circuit breaker, comprising:

[0007] Base;

[0008] An arc-extinguishing chamber is disposed on the base and has an arc-extinguishing cavity.

[0009] The moving contact assembly includes a first moving contact and a second moving contact. One end of the first moving contact is movably disposed on the base, and the other end is provided with a first moving contact point and extends into the arc extinguishing cavity. One end of the second moving contact is movably disposed on the base, and the other end is provided with a second moving contact point. The second moving contact is located outside the arc extinguishing cavity.

[0010] A stationary contact assembly includes a stationary guide plate and a first stationary contact and a second stationary contact, both connected to the stationary guide plate. The first stationary contact includes a first segment and a second segment with a bent structure. One end of the first segment is connected to the stationary guide plate, and the other end extends away from the stationary guide plate and is connected to the second segment. The other end of the second segment extends towards the stationary guide plate and is provided with a first stationary contact point at its end. The first moving contact point is used to contact or separate from the first stationary contact point. One end of the second stationary contact is connected to the stationary guide plate, and the other end extends away from the stationary guide plate and is provided with a second stationary contact point at its end for contacting or separating from the second moving contact point.

[0011] When the first stationary contact is in contact with the first moving contact, the current flow direction of the second segment is opposite to that of the first segment.

[0012] In an optional embodiment, the circuit breaker further includes a partition assembly detachably disposed on the base, the partition assembly forming an isolation channel communicating with the arc-extinguishing cavity, the first moving contact being movably disposed in the isolation channel and the arc-extinguishing cavity, the partition assembly isolating the first moving contact and the second moving contact, and isolating the first stationary contact and the second stationary contact.

[0013] In an optional embodiment, the partition assembly includes two partitions, which are spaced apart and form the isolation channel, and the two partitions are inserted into the base.

[0014] In an optional embodiment, the two partitions are also inserted into the arc-extinguishing chamber.

[0015] In an optional embodiment, the partition assembly includes two baffles, which are respectively connected to the two partitions and are spaced apart from the arc-extinguishing chamber.

[0016] In an optional embodiment, the partition assembly further includes a connector, the two ends of which are respectively connected to the two partitions.

[0017] In an optional embodiment, the circuit breaker further includes a first insulating member, which is sleeved on the first stationary contact and located on the side of the first stationary contact facing the second stationary contact.

[0018] In an optional embodiment, the circuit breaker further includes an arc-starting element and an insulating mounting element. The insulating mounting element is disposed on the stationary guide plate, one end of the arc-starting element is connected to the first stationary contact, and the other end is disposed on the insulating mounting element.

[0019] In an optional embodiment, the second moving contact is located on both sides of the first moving contact, and the second stationary contact is located on both sides of the first stationary contact.

[0020] In an optional embodiment, the arc-extinguishing chamber includes two spaced-apart second insulating members, which together form the arc-extinguishing cavity;

[0021] The two partitions are respectively inserted into the two second insulating components, and the two partitions form an isolation channel communicating with the arc-extinguishing cavity. The first moving contact is movably disposed in the isolation channel and the arc-extinguishing cavity.

[0022] In an optional embodiment, the circuit breaker further includes a middle cover, which is mounted on the base and has a fixing part that is fixedly engaged with the two partitions.

[0023] In an optional embodiment, the circuit breaker further includes a middle cover, which is mounted on the base and has a fixing part that is fixedly engaged with the two partitions and / or the two baffles.

[0024] In an optional embodiment, the circuit breaker further includes a partition assembly comprising two partitions, the partition assembly being integrally formed with the base.

[0025] The beneficial effects of the circuit breaker provided by this utility model embodiment include: by designing a bent structure for the first stationary contact, when the first stationary contact is in contact with the first moving contact, the current flow direction of the second section is opposite to that of the first section. This effectively guides the arc towards the arc-extinguishing chamber during the circuit breaker's breaking process, accelerating the arc's detachment from the contact area and entry into the arc-extinguishing chamber, thereby improving arc-extinguishing efficiency. Furthermore, this structure helps prevent the arc from lingering or spreading to non-arc-extinguishing areas, reducing the risk of arc reignition and improving the stability and safety of the circuit breaker's breaking process. In addition, the first and second moving contacts correspond to the auxiliary circuit and the main circuit respectively, achieving functional zone control and further enhancing electrical isolation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the first embodiment of the circuit breaker provided by this utility model;

[0028] Figure 2 This is one of the partial structural schematic diagrams of the circuit breaker provided in the first embodiment of the present utility model;

[0029] Figure 3 This is the second schematic diagram of a partial structure of the circuit breaker provided in the first embodiment of the present utility model.

[0030] Figure 4 A first-view structural schematic diagram of the static contact assembly and the arc-inducing assembly provided in the embodiments of this utility model;

[0031] Figure 5 A second-view structural schematic diagram of the static contact component and the arc-inducing component provided in the embodiments of this utility model;

[0032] Figure 6 A third-view structural diagram of the static contact assembly and the arc-inducing assembly provided in the embodiments of this utility model;

[0033] Figure 7 A schematic diagram of the first embodiment of the partition assembly provided in this utility model;

[0034] Figure 8 A schematic diagram of the second embodiment of the circuit breaker provided in this utility model;

[0035] Figure 9 A schematic diagram of the second embodiment of the partition assembly provided in this utility model;

[0036] Figure 10 Exploded view of the arc-extinguishing chamber provided for an embodiment of this utility model;

[0037] Figure 11 This is a schematic diagram of the insulating mounting component structure provided in an embodiment of the present utility model;

[0038] Figure 12 A schematic diagram of the moving contact component, the stationary contact component, and the arc-inducing component provided in the embodiments of this utility model.

[0039] Icons: 10-Circuit breaker; 100-Arc extinguishing chamber; 110-Arc extinguishing cavity; 120-Second insulator; 130-Grid assembly; 200-Moving contact assembly; 210-First moving contact; 211-First moving contact; 220-Second moving contact; 221-Second moving contact; 300-Stationary contact assembly; 310-Stationary guide plate; 320-First stationary contact; 321-First section; 322-Second section; 323-First stationary contact; 330-Second stationary contact; 331-Second stationary contact; 400-Baffle assembly; 410-Baffle; 411-Isolation channel; 420-Baffle; 430-Connector; 500-First insulator; 600-Arc ignition assembly; 610-Arc ignition component; 620-Insulation mounting component; 700-Base. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0046] Circuit breakers, as key devices in power systems used to protect circuits, primarily function to connect and disconnect circuits under normal or fault conditions, thereby ensuring the safe operation of electrical equipment and lines. Among these components, the contact system, as one of the core components of a circuit breaker, directly affects the circuit breaker's breaking performance, electrical life, and operational reliability through its structural design.

[0047] In existing technologies, many circuit breakers employ a combination structure of "short contacts + long contacts." The short contacts enable rapid switching of the main circuit, while the long contacts carry the operating current and assist in arc control. This structure improves current carrying capacity and initial arc guiding effect to some extent. However, due to unreasonable contact structure design or obstructed arc extinguishing paths in existing systems, the arc is difficult to be quickly introduced into the arc extinguishing chamber, and phenomena such as arc retention and reignition may occur, affecting the circuit breaker's breaking speed and stability. In severe cases, this can even cause equipment damage or safety accidents.

[0048] Based on the problems existing in the current technology, please refer to Figures 1 to 12 This utility model provides a circuit breaker 10 with a reasonable structural design, which is conducive to the rapid guidance and extinguishing of electric arc, improves the overall performance and safety of the circuit breaker 10, and meets the requirements of modern power systems for high-reliability protection equipment.

[0049] In detail, the circuit breaker 10 includes a base 700, an arc-extinguishing chamber 100, a moving contact assembly 200, and a stationary contact assembly 300.

[0050] The arc-extinguishing chamber 100 is located on the base 700, and the arc-extinguishing chamber 100 is provided with an arc-extinguishing cavity 110.

[0051] The moving contact assembly 200 includes a first moving contact 210 and a second moving contact 220. One end of the first moving contact 210 is movably disposed on the base 700, and the other end is provided with a first moving contact point 211 and extends into the arc-extinguishing chamber 110. One end of the second moving contact 220 is movably disposed on the base 700, and the other end is provided with a second moving contact point 221. The second moving contact 220 is located outside the arc-extinguishing chamber 100.

[0052] The stationary contact assembly 300 includes a stationary guide plate 310 and a first stationary contact 320 and a second stationary contact 330, both connected to the stationary guide plate 310. The first stationary contact 320 includes a first segment 321 and a second segment 322 with a bent structure. One end of the first segment 321 is connected to the stationary guide plate 310, and the other end extends away from the stationary guide plate 310 and is connected to the second segment 322. The other end of the second segment 322 extends towards the stationary guide plate 310, and a first stationary contact 323 is provided at the end. A first moving contact 211 is used to contact or separate from the first stationary contact 323. One end of the second stationary contact 330 is connected to the stationary guide plate 310, and the other end extends away from the stationary guide plate 310, and a second stationary contact 331 is provided at the end for contacting or separating from the second moving contact 221.

[0053] In this embodiment, by designing a bent structure for the first stationary contact 320, when the first stationary contact 323 is in contact with the first moving contact 211, the current flow direction of the second segment 322 is opposite to that of the first segment 321. This effectively guides the arc towards the arc-extinguishing chamber 110 during the circuit breaker 10's breaking process, accelerating the arc's detachment from the contact area and entry into the arc-extinguishing chamber 100, thereby improving arc-extinguishing efficiency. Furthermore, this structure helps prevent the arc from lingering or spreading to non-arc-extinguishing areas, reducing the risk of arc reignition and improving the stability and safety of the circuit breaker 10's breaking process. In addition, the first moving contact 210 and the second moving contact 220 correspond to the auxiliary circuit and the main circuit, respectively, achieving functional zone control and further enhancing electrical isolation.

[0054] It should be noted that the first stationary contact 323 is located below the arc-extinguishing chamber 100 and is at least partially located within the projection range of the arc-extinguishing cavity 110 in the height direction.

[0055] It is also worth mentioning that the second moving contact 220 is located on both sides of the first moving contact 210, and the second stationary contact 330 is located on both sides of the first stationary contact 320. That is, at least one second moving contact 220 is provided on both sides of the first moving contact 210, and correspondingly, two second stationary contacts 330 are provided on both sides of the first stationary contact 320. One or more second stationary contacts 331 are provided on the second stationary contact 330. The second moving contact 221 on one or more second moving contacts 220 located on the same side is in contact with or separates from one second stationary contact 331, or is in contact with or separates from multiple second stationary contacts 331 respectively.

[0056] Of course, it is also feasible to have the second stationary contact 330 located on one side of the first stationary contact 320 and the second moving contact 220 located on one side of the first moving contact 210.

[0057] When the moving contact assembly 200 contacts the stationary contact assembly 300, the first moving contact 210 and the first stationary contact 320 contact the second moving contact 220 and the second stationary contact 330 before the second moving contact 220 and the second stationary contact 330. When the moving contact assembly 200 separates from the stationary contact assembly 300, the first moving contact 210 and the first stationary contact 320 separate after the second moving contact 220 and the second stationary contact 330.

[0058] Furthermore, the circuit breaker 10 also includes a partition assembly 400, which is detachably disposed on the base 700. The partition assembly 400 forms an isolation channel 411 communicating with the arc-extinguishing cavity 110. The first moving contact 210 is movably disposed in the isolation channel 411 and the arc-extinguishing cavity 110.

[0059] In this embodiment, the partition assembly 400 isolates the first moving contact 210 and the second moving contact 220, thereby effectively blocking the arc and preventing the arc generated during the breaking process between the first moving contact 211 and the first stationary contact 323 from spreading to the second moving contact 221 and the second stationary contact 331. This enhances the electrical isolation performance of the circuit breaker 10 and improves its stability and safety.

[0060] In detail, the partition assembly 400 includes two partitions 410, which are spaced apart and form an isolation channel 411. The two partitions 410 are inserted into the base 700, thereby ensuring that the two partitions 410 are securely installed on the base 700, thus improving the stability of its installation structure. It is understood that the two partitions 410 can also be connected to the base 700 in an integral molding manner, which is not specifically limited here.

[0061] It is worth mentioning that the partition assembly 400 isolates the first moving contact 210 and the second moving contact 221, and isolates the first stationary contact 320 and the second stationary contact 331. That is, the second moving contact 221 and the second stationary contact 331 are located within the projection range of the parallel plane of the partition 410, while the first moving contact 210 is at least partially located within the arc extinguishing cavity 110. Therefore, the partition assembly 400 can effectively isolate the electric arc.

[0062] It should also be noted that the arc-extinguishing chamber 100 includes two spaced-apart second insulating members 120, which together form an arc-extinguishing cavity 110.

[0063] Two partitions 410 are respectively inserted into two second insulating components 120, and the two partitions 410 form an isolation channel 411 that communicates with the arc-extinguishing cavity 110. The first moving contact 210 is movably disposed in the isolation channel 411 and the arc-extinguishing cavity 110.

[0064] In other words, a closed second insulating member 120 is provided on both sides of the first moving contact 211 of the first moving contact 210. The second insulating member 120 and the two partitions 410 extend from the arc extinguishing cavity 110 toward the second moving contact 220 and pass through the second moving contact 221 of the second moving contact 220, thereby separating the first moving contact 211 and the second moving contact 221. This prevents the high-temperature ionized gas generated when the first moving contact 211 on the longer first moving contact 210 separates from the first stationary contact 323 from overflowing, which would cause an arc to be generated between the adjacent second moving contact 221 and the second stationary contact 331. Therefore, it effectively avoids the failure to interrupt the current.

[0065] Optionally, the second insulating element 120 may be made of a gas-generating material.

[0066] It is worth mentioning that in some embodiments of this utility model, such as Figure 8 and Figure 9 As shown, the partition assembly 400 includes only two partitions 410.

[0067] It should be noted that the two partitions 410 are inserted into the arc-extinguishing chamber 100. For example, the arc-extinguishing chamber 100 is provided with a groove structure or a protrusion structure. The partitions 410 can be nested and inserted into the groove structure or inserted into the protrusion structure, thereby reducing the gap between the partitions 410 and the arc-extinguishing chamber 100, and thus preventing the arc from transferring from the gap to the contact point of the second moving contact 220 and the second stationary contact 330.

[0068] Of course, in some other embodiments of this utility model, the two partitions 410 may also have a small gap between them and the arc-extinguishing chamber 100, which is not enough to cause the second moving contact 221 and the first moving contact 210 to fail to isolate.

[0069] In addition, the circuit breaker 10 also includes a middle cover (not shown), which is mounted on the base 700. The middle cover has a fixing part that is fixedly engaged with two partitions 410. Therefore, in this embodiment, while the middle cover is being installed on the base 700, the partitions 410 can also be fixedly engaged with the fixing part on the middle cover, further improving the installation stability of the partitions 410. Optionally, the structure of the fixing part can be a groove structure, a through groove structure, or other structures, as long as the partitions 410 can be embedded into the fixing part to improve installation stability; no specific limitation is made here.

[0070] In other embodiments of this utility model, such as Figures 2 to 6 As shown, in order to further enhance the electrical isolation effect of the partition assembly 400, the partition assembly 400 also includes two baffles 420, which are respectively connected to two partitions 410 and are spaced apart from the arc extinguishing chamber 100.

[0071] The partition 410 and the baffle 420 are connected in a roughly Π shape, so the L-shaped area formed by the partition 410 and the baffle 420 surrounds the second moving contact 220, thus effectively preventing the arc from transferring to the second moving contact 221.

[0072] Because of the isolation function of the baffle 420, and in order to facilitate the installation of the baffle assembly 400, in this embodiment, the baffle 410 and the baffle 420 do not need to contact the arc-extinguishing chamber 100, that is, the baffle 420 and the arc-extinguishing chamber 100 can be arranged at an interval.

[0073] It is understood that in this embodiment, the fixing part of the middle cover can also be fixedly engaged with at least one of the two partitions 410 and the two baffles 420 to further improve the installation stability of the partition assembly 400.

[0074] It should also be noted that the two baffles 410 are respectively disposed on both sides of the first stationary contact 320 and located between the first stationary contact 320 and the second stationary contact 330, with the bottom of the baffle 420 overlapping the second stationary contact 330. Of course, in some other embodiments of this utility model, the bottom of the baffle 420 may also have a small gap with the second stationary contact 330, which is insufficient to cause the second moving contact 221 and the first moving contact 210 to fail to isolate each other.

[0075] Furthermore, the partition assembly 400 also includes a connector 430, the two ends of which are connected to the two partitions 410 respectively. In other words, the two baffles 420, the two partitions 410 and the connector 430 can be manufactured using an integral molding process, which can not only improve the installation stability of the partition assembly 400, but also facilitate assembly and improve installation efficiency.

[0076] Furthermore, the circuit breaker 10 also includes a first insulating member 500, which is sleeved on the first stationary contact 320 and is located on the side of the first stationary contact 323 facing the second stationary contact 331.

[0077] It should be noted that the connection between the first segment 321 and the second segment 322 is a bent structure. The first insulating component 500 is adjacent to the first stationary contact 323 and is sleeved at the bend between the first segment 321 and the second segment 322. This prevents the electric arc generated during the breaking process of the first moving contact 211 and the first stationary contact 323 from transferring along the bend of the first segment 321 and breaking through this point, thus effectively protecting the first stationary contact 320 and extending its service life.

[0078] Furthermore, the circuit breaker 10 also includes an arc-starting assembly 600, which includes an arc-starting element 610 and an insulating mounting element 620. The insulating mounting element 620 is disposed on the stationary guide plate 310, serving to position the arc-starting element 610 and the stationary guide plate 310, and to seal the gap between the first stationary contact 320 and the second stationary contact 330, preventing the arc gas from moving downwards. One end of the arc-starting element 610 is connected to the first stationary contact 323, and the other end is disposed on the insulating mounting element 620. Therefore, during the breaking process of the first moving contact 211 and the first stationary contact 323, the arc-starting element 610 can guide the arc in the direction toward the arc-extinguishing chamber 100, further improving the arc-extinguishing effect.

[0079] Furthermore, such as Figure 10 As shown, the arc-extinguishing chamber 100 also includes a grid plate assembly 130, which comprises an array of multiple grid plates, each grid plate having a belly and legs on both sides of the belly. The legs on both sides are respectively located within two spaced-apart second insulating members 120.

[0080] In summary, this utility model embodiment provides a circuit breaker 10. By designing a bent structure for the first stationary contact 320, when the first stationary contact 323 is in contact with the first moving contact 211, the current flow direction of the second segment 322 is opposite to that of the first segment 321. This effectively guides the arc towards the arc-extinguishing chamber 110 during the circuit breaker 10's breaking process, accelerating the arc's detachment from the contact area and entry into the arc-extinguishing chamber 100, thereby improving arc-extinguishing efficiency. Furthermore, this structure helps prevent the arc from lingering or spreading to non-arc-extinguishing areas, reducing the risk of arc reignition and improving the stability and safety of the circuit breaker 10's breaking process. In addition, the first moving contact 210 and the second moving contact 220 correspond to the auxiliary circuit and the main circuit, respectively, achieving functional zone control and further enhancing electrical isolation.

[0081] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A circuit breaker characterized by, include: Base (700); An arc-extinguishing chamber (100) is disposed on the base (700), and the arc-extinguishing chamber (100) is provided with an arc-extinguishing cavity (110). The moving contact assembly (200) includes a first moving contact (210) and a second moving contact (220). One end of the first moving contact (210) is movably disposed on the base (700), and the other end is provided with a first moving contact point (211) and extends into the arc-extinguishing chamber (110). One end of the second moving contact (220) is movably disposed on the base (700), and the other end is provided with a second moving contact point (221). The second moving contact (220) is located outside the arc-extinguishing chamber (100). A stationary contact assembly (300) includes a stationary guide plate (310) and a first stationary contact (320) and a second stationary contact (330) both connected to the stationary guide plate (310). The first stationary contact (320) includes a first segment (321) and a second segment (322) with a bent structure. One end of the first segment (321) is connected to the stationary guide plate (310), and the other end extends away from the stationary guide plate (310) and is connected to the second segment (322). The other end of the second segment (322) extends toward the stationary guide plate (310) and is provided with a first stationary contact (323) at the end. The first moving contact (211) is used to contact or separate from the first stationary contact (323). One end of the second stationary contact (330) is connected to the stationary guide plate (310), and the other end extends away from the stationary guide plate (310) and is provided with a second stationary contact (331) at the end for contacting or separating from the second moving contact (221). When the first stationary contact (323) is in contact with the first moving contact (211), the current flow direction of the second segment (322) is opposite to the current flow direction of the first segment (321).

2. The circuit breaker of claim 1, wherein, The circuit breaker further includes a partition assembly (400), which is detachably disposed on the base (700). The partition assembly (400) forms an isolation channel (411) communicating with the arc-extinguishing cavity (110). The first moving contact (210) is movably disposed in the isolation channel (411) and the arc-extinguishing cavity (110). The partition assembly (400) isolates the first moving contact (210) and the second moving contact (221), and isolates the first stationary contact (320) and the second stationary contact (331).

3. The circuit breaker of claim 2, wherein, The partition assembly (400) includes two partitions (410), which are spaced apart and form the isolation channel (411), and the two partitions (410) are inserted into the base (700).

4. The circuit breaker of claim 3, wherein, The two partitions (410) are also inserted into the arc-extinguishing chamber (100).

5. The circuit breaker of claim 3, wherein, The partition assembly (400) includes two baffles (420), which are respectively connected to the two partitions (410) and are spaced apart from the arc-extinguishing chamber (100).

6. The circuit breaker of any of claims 3-5, wherein, The partition assembly (400) further includes a connector (430), the two ends of which are respectively connected to the two partitions (410).

7. The circuit breaker of claim 1, wherein, The circuit breaker further includes a first insulating element (500), which is sleeved on the first stationary contact (320) and is located on the side of the first stationary contact (323) facing the second stationary contact (331).

8. The circuit breaker of claim 1, wherein, The circuit breaker also includes an arc-starting component (610) and an insulating mounting component (620). The insulating mounting component (620) is disposed on the stationary guide plate (310). One end of the arc-starting component (610) is connected to the first stationary contact (323), and the other end is disposed on the insulating mounting component (620).

9. The circuit breaker of claim 1, wherein, The second moving contact (220) is located on both sides of the first moving contact (210), and the second stationary contact (330) is located on both sides of the first stationary contact (320).

10. The circuit breaker of claim 3, wherein, The arc-extinguishing chamber (100) includes two spaced-apart second insulating members (120), which together form the arc-extinguishing cavity (110). The two partitions (410) are respectively inserted into the two second insulating members (120), and the two partitions (410) form an isolation channel (411) communicating with the arc extinguishing cavity (110). The first moving contact (210) is movably disposed in the isolation channel (411) and the arc extinguishing cavity (110).

11. The circuit breaker of claim 3, wherein, The circuit breaker also includes a middle cover, which is installed on the base (700). The middle cover is provided with a fixing part, which is fixedly engaged with the two partitions (410).

12. The circuit breaker of claim 5, wherein, The circuit breaker also includes a middle cover, which is installed on the base (700). The middle cover is provided with a fixing part, which is fixedly engaged with the two partitions (410) and / or the two baffles (420).

13. The circuit breaker of claim 1, wherein, The circuit breaker also includes a partition assembly (400), which includes two partitions (410) and is integrally formed with the base (700).

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