A circuit breaker
Patent Information
- Application Number
- CN202521649489.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-08-04
AI Technical Summary
[0003]由于电弧在阴极的转移速度较阳极为慢，且阴极侧不易发生电弧跳跃行为，即电弧难以直接从阴极跳转至灭弧栅片或引弧角，导致电弧在动触头端的转移路径受限，需先跳跃至引弧角后再进行转移，显著降低了电弧的转移效率
[0014]本申请实施例的有益效果包括：
Smart Images
Figure CN224652338U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a circuit breaker. Background Technology
[0002] In existing arc-extinguishing structure designs for switching devices, a moving contact and a stationary contact are typically used in combination, with an arc-guiding plate and an arc-extinguishing grid used to guide and break the arc. However, in existing technology, the moving contact is connected to the cathode, while the stationary contact is connected to the anode. In this case, the arc exhibits cathode characteristics at the moving contact end.
[0003] Because the arc transfers more slowly at the cathode than at the anode, and arc jumping is less likely to occur at the cathode (meaning the arc cannot directly jump from the cathode to the arc-extinguishing grid or the arc-ignition angle), the arc's transfer path at the moving contact end is limited. It must first jump to the arc-ignition angle before transferring, significantly reducing the arc transfer efficiency. Furthermore, although a large number of grids are configured at the moving end of the moving contact to enhance arc extinguishing capability, the arc's inability to effectively reach this area results in low grid utilization, failing to fully realize its intended arc-extinguishing function. Utility Model Content
[0004] The purpose of this application is to provide a circuit breaker that improves the efficiency of arc transfer on the moving contact by optimizing the structure of the first set of arc-extinguishing grids, thereby effectively enhancing the utilization rate of the arc-extinguishing grids.
[0005] The embodiments of this application are implemented as follows: This application provides a circuit breaker, including a protective housing, an arc-extinguishing assembly, a moving contact for connecting to the anode, and a stationary contact for connecting to the cathode; an arc-extinguishing chamber is formed within the protective housing, and the arc-extinguishing chamber is divided into a first region and a second region; the first region is near the open position of the moving contact, and the second region is near the stationary contact; the arc-extinguishing assembly includes a first set of arc-extinguishing grids arranged in the first region and a second set of arc-extinguishing grids arranged in the second region; the number of the first set of arc-extinguishing grids is less than the number of the second set of arc-extinguishing grids; in the open position, the arc at the moving contact is transferred to the first set of arc-extinguishing grids. As an optional implementation, it also includes an operating handle and an operating mechanism; the protective housing is provided with a first rotating shaft and a second rotating shaft that are parallel and spaced apart; the operating handle has a rotating part sleeved on the first rotating shaft, and the operating handle is driven to drive the operating mechanism to move, so that the moving contact moves around the second rotating shaft to open and close the circuit; the projections of the center of the first rotating shaft and the center of the second rotating shaft on the moving contact's movement plane form a line; the first region and the second region are respectively located on both sides of the line.
[0006] As an optional implementation, during the tripping operation, the rotating part of the operating handle moves counterclockwise around the first rotating axis, and the moving contact moves clockwise around the second rotating axis; and the handle operating part on the operating handle and the moving contact are located on the same side of the connecting line.
[0007] As an optional implementation, the arc extinguishing component includes a movable arc-starting element; the movable arc-starting element includes a first extension portion and a second extension portion integrally bent and spaced in parallel; the first extension portion coincides with the first side edge of the first region, and the extension direction of the second extension portion coincides with the second side edge of the first region.
[0008] As an optional implementation, the moving arc trigger further includes an intermediate connecting portion connecting the first extension and the second extension; after the circuit is opened, the second extension has an abutting portion that contacts the moving contact; the intermediate connecting portion and the first extension both extend in a direction away from the abutting portion.
[0009] As an optional implementation, the arc extinguishing assembly includes a stationary arc-inducing component; the stationary arc-inducing component includes an inclined connecting section and a bent section; a first end of the inclined connecting section is connected to the stationary contact, and a second end is connected to the bent section; the extension direction of the bent section coincides with the first side edge of the second region, and the first end coincides with the second side edge of the second region; the first side and the second side of the second region are arranged opposite to each other.
[0010] As an optional implementation, the arc-extinguishing chamber is divided into a third region; the third region is located between the first region and the second region; and a third set of arc-extinguishing grids are arranged in the third region on the moving plane of the moving contact.
[0011] As an optional implementation, the first group of arc-extinguishing grid plates, the second group of arc-extinguishing grid plates, and the third group of arc-extinguishing grid plates each include a plurality of arc-extinguishing grid plates arranged in parallel and spaced apart along the length direction of the protective housing; the connecting line is consistent with the extension direction of the arc-extinguishing grid plates.
[0012] As an optional implementation, the length of the third group of arc-extinguishing grids is greater than that of the first group of arc-extinguishing grids; and / or, the length of the third group of arc-extinguishing grids is greater than that of the second group of arc-extinguishing grids.
[0013] As an optional implementation, it also includes an electromagnetic trip unit, which is connected to the operating mechanism and drives the operating mechanism to move, causing the moving contact to perform a tripping action.
[0014] The beneficial effects of the embodiments of this application include: This application connects the moving contact to the anode, making it easier for the arc to jump from the moving contact end to the nearby arc-extinguishing grid during the breaking process. Due to the higher electron emission capability and stronger arc jumping tendency of the anode side, compared to the traditional structure where the moving contact, acting as the cathode, must first jump to the arc-ignition angle before transferring to the arc-extinguishing assembly, this solution significantly shortens the arc transfer path and improves the arc-guided response speed. This more efficient arc transfer mechanism allows the arc energy to be absorbed and dispersed by the arc-extinguishing assembly more quickly, thereby effectively shortening the arc-extinguishing time and improving the overall breaking speed and performance of the switchgear. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the circuit breaker tripping structure according to an embodiment of this application; Figure 2 This is a schematic diagram of the circuit breaker closing structure according to an embodiment of this application.
[0017] Icons: 100-Protective housing; 101-Arc extinguishing assembly; 102-Moving contact; 103-Stationary contact; 104-First region; 105-Second region; 106-First set of arc extinguishing grids; 107-Second set of arc extinguishing grids; 108-Operating handle; 109-Operating mechanism; 110-First rotating shaft; 111-Second rotating shaft; 112-Connecting wire; 113-Moving arc igniter; 114-First extension; 115-Second extension; 116-Stationary arc igniter; 117-Inclined connecting section; 118-Bending section; 119-Third region; 120-Third set of arc extinguishing grids; 121-Electromagnetic trip unit. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0020] It should be noted that similar reference numerals 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. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0021] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0022] In existing arc-extinguishing structure designs for switching devices, a moving contact 102 and a stationary contact 103 are typically used in conjunction, with the arc-guiding plate and arc-extinguishing grid used to guide and break the arc. However, in the prior art, the moving contact 102 is connected to the cathode, while the stationary contact 103 is connected to the anode. In this case, the arc at the moving contact 102 end exhibits cathode characteristics.
[0023] Because the arc transfer speed at the cathode is slower than at the anode, and arc jumping is less likely to occur at the cathode, meaning the arc cannot directly jump from the cathode to the arc-extinguishing grid or the arc-ignition angle, the arc transfer path at the moving contact 102 is limited. It must first jump to the arc-ignition angle before transferring, significantly reducing the arc transfer efficiency. Furthermore, although a large number of grids are configured at the moving end of the moving contact 102 to enhance arc extinguishing capability, the arc cannot effectively reach this area, resulting in low grid utilization and failing to fully realize its intended arc-extinguishing function.
[0024] To address the aforementioned technical problems, this application provides a circuit breaker.
[0025] Reference Figure 1 , Figure 2As shown, the circuit breaker provided in this application embodiment includes a protective housing 100, an arc-extinguishing assembly 101, a moving contact 102 for connecting the anode, and a stationary contact 103 for connecting the cathode. An arc-extinguishing chamber is formed within the protective housing 100, and the arc-extinguishing chamber is divided into a first region 104 and a second region 105. The first region 104 is close to the open position of the moving contact 102, and the second region 105 is close to the stationary contact 103. The arc-extinguishing assembly 101 includes a first set of arc-extinguishing grid plates 106 arranged in the first region 104 and a second set of arc-extinguishing grid plates 107 arranged in the second region 105. The number of the first set of arc-extinguishing grid plates 106 is less than the number of the second set of arc-extinguishing grid plates 107. When in the open position, the arc at the moving contact 102 is transferred to the first set of arc-extinguishing grid plates 106.
[0026] The ratio of the number of arc-extinguishing grid plates 106 in the first group to the number of the number of arc-extinguishing grid plates 107 in the second group can be set by those skilled in the art as needed. For example, the first group has 6 arc-extinguishing grid plates, and the second group has 11. For example, the first group has 5 arc-extinguishing grid plates, and the second group has 10. For example, the first group has 7 arc-extinguishing grid plates, and the second group has 12.
[0027] It should be noted that in traditional designs, the moving contact 102 is usually connected to the cathode, which causes the arc to exhibit cathode characteristics at the moving contact 102 end, while the arc transfer speed on the cathode side is slow and it is not easy to jump to the arc extinguishing grid.
[0028] In this embodiment, the moving contact 102 is connected to the anode, so that the end of the moving contact 102 exhibits anode characteristics. By utilizing the characteristics of the anode arc being easier to jump and faster to transfer, the arc guiding efficiency is improved.
[0029] In this embodiment of the application, the arc-extinguishing chamber space is structurally divided into at least two functional areas: The first region 104 is located near the position after the moving contact 102 is opened; the second region 105 is located on one side of the stationary contact 103.
[0030] This division in the embodiments of this application helps to achieve partitioned control of the arc path and optimize the transfer process of the arc from the moving contact 102 and the stationary contact 103 to the arc extinguishing component 101.
[0031] It should be noted that, since the moving contact 102 is connected to the anode, the arc is more likely to jump from the anode to the nearby arc-extinguishing grid. Therefore, although the first group of arc-extinguishing grids 106 is fewer in number, it is located at the position where the arc is most likely to jump, thus its utilization rate is high and it can effectively participate in arc extinguishing. Although the second group of arc-extinguishing grids 107 is more numerous, it is close to the stationary contact 103, which is the cathode, and is mainly used for further segmentation and cooling of the subsequent arc path. The embodiments of this application break away from the traditional design concept of "multiple grids on the moving end". The embodiments of this application emphasize the optimization of the structural distribution of the arc-extinguishing grids according to the arc transfer path and electrode characteristics.
[0032] The technical effects that the embodiments of this application can produce are as follows: This application connects the moving contact 102 to the anode, making it easier for the arc to jump from the moving contact 102 to the nearby arc-extinguishing grid during the breaking process. Because the anode side has a higher electron emission capability and a stronger arc jumping tendency, compared to the traditional structure where the moving contact 102, as the cathode, must first jump to the arc-ignition angle before transferring to the arc-extinguishing assembly 101, this solution significantly shortens the arc transfer path and improves the arc-guided response speed. This more efficient arc transfer mechanism allows the arc energy to be absorbed and dispersed by the arc-extinguishing assembly 101 more quickly, thereby effectively shortening the arc-extinguishing time and improving the overall breaking speed and performance of the switchgear.
[0033] In traditional designs, although a large number of arc-extinguishing grids are configured on the moving end corresponding to the moving contact 102, the arc is difficult to directly jump to this area because the moving contact 102 is usually connected to the cathode, resulting in a large number of grids not being fully utilized. This application, however, rationally adjusts the grid distribution, placing the critical first set of arc-extinguishing grids 106 in the first region 104 (close to the opening position of the moving contact 102), where the arc is most easily reached. Although their number is smaller, their hit rate is high and their participation is strong. Simultaneously, a larger number of second set of arc-extinguishing grids 107 are set in the second region 105 (close to the stationary contact 103) for further arc segmentation and cooling. This zoning configuration strategy achieves efficient utilization of grid resources and enhances the overall effectiveness of the arc-extinguishing assembly 101.
[0034] This application embodiment optimizes the spatial layout of the arc-extinguishing assembly 101, which not only improves arc transfer efficiency and arc-extinguishing capability but also effectively reduces the risk of concentrated arc erosion of the contacts and local areas of the arc-extinguishing assembly 101. A reasonable distribution of arc-extinguishing grid plates and a zoned control mechanism help to evenly disperse arc energy, slow down component aging, and extend equipment lifespan.
[0035] Reference Figure 1 , Figure 2As shown, as an optional implementation, it also includes an operating handle 108 and an operating mechanism 109; the protective housing 100 is provided with a first rotating shaft 110 and a second rotating shaft 111 that are parallel and spaced apart; the operating handle 108 has a rotating part sleeved on the first rotating shaft 110, and the operating handle 108 is driven to drive the operating mechanism 109 to move, so that the moving contact 102 moves around the second rotating shaft 111 to open and close the circuit; the projections of the center of the first rotating shaft 110 and the center of the second rotating shaft 111 on the moving plane of the moving contact 102 form a connecting line 112; the first region 104 and the second region 105 are respectively provided on both sides of the connecting line 112.
[0036] This embodiment of the application sets up an operating handle 108 and an operating mechanism 109, and arranges a first rotating shaft 110 and a second rotating shaft 111 that are parallel and spaced apart in the protective housing 100, so that the rotating part of the operating handle 108 is sleeved on the first rotating shaft 110. When the operating handle 108 is driven, it can drive the operating mechanism 109 to move, thereby causing the moving contact 102 to perform opening and closing operations around the second rotating shaft 111.
[0037] It should be noted that the projections of the centers of the first rotating shaft 110 and the second rotating shaft 111 onto the moving plane of the moving contact 102 form a connecting line 112, and the first region 104 and the second region 105 of the arc-extinguishing chamber are respectively arranged on both sides of this connecting line 112. This design in the embodiment of this application not only optimizes the operating path of the moving contact 102, ensuring that the arc is quickly and directly transferred from the end of the moving contact 102 to the first set of arc-extinguishing grid plates 106, but also maximizes the use of the function of the arc-extinguishing grid plates through a reasonable spatial layout, improving the arc transfer efficiency and arc extinguishing effect. In addition, this structure enhances the operational stability and reliability of the equipment, and helps to achieve a more efficient and safer current breaking process.
[0038] As an optional implementation, during the opening operation, the rotating part of the operating handle 108 moves counterclockwise around the first rotating shaft 110, and the moving contact 102 moves clockwise around the second rotating shaft 111; and the handle operating part on the operating handle 108 and the moving contact 102 are located on the same side of the connecting line 112.
[0039] It should be noted that the handle operation part on the operating handle 108 and the moving contact 102 are located on the same side of the line 112 formed by the center projection of the first rotating shaft 110 and the second rotating shaft 111.
[0040] The layout of this embodiment ensures the directness and efficiency of the operating force transmission, making the tripping action smoother, faster, and more precise. Furthermore, since the moving contact 102 is the anode, its clockwise movement facilitates the rapid transfer of the arc to the first set of arc-extinguishing grid plates 106 arranged on that side, further improving the arc transfer efficiency and the utilization rate of the arc-extinguishing assembly 101, thereby enhancing the breaking capacity and reliability of the entire circuit breaker. This design not only improves the ease of operation and response speed of the equipment but also effectively optimizes the arc-extinguishing process, extends the service life of the equipment, and improves safety.
[0041] Reference Figure 1 , Figure 2 As shown, in one optional implementation, the arc extinguishing assembly 101 includes a movable arc ignition member 113; the movable arc ignition member 113 includes a first extension 114 and a second extension 115 integrally bent and spaced in parallel; the first extension 114 coincides with the first side edge of the first region 104, and the extension direction of the second extension 115 coincides with the second side edge of the first region 104.
[0042] It should be noted that the embodiments of this application enable the moving arc igniter 113 to precisely match the movement trajectory of the arc in the arc extinguishing chamber, thus providing excellent guidance. By placing the moving arc igniter 113 in the first region 104 near the opening position of the moving contact 102 and matching its extension direction with the arc transfer path, it helps to accelerate the jump and transfer of the arc from the anode (moving contact 102) to the arc extinguishing grid, thereby improving arc extinguishing efficiency. Simultaneously, the integrally bent structure not only enhances the overall strength and stability of the arc igniter but also simplifies the assembly process, improving product reliability and production efficiency.
[0043] Reference Figure 1 , Figure 2 As shown, in an optional embodiment, the moving arc trigger 113 further includes an intermediate connecting portion connecting the first extension 114 and the second extension 115; after the circuit is opened, the second extension 115 has an abutting portion that contacts the moving contact 102; the intermediate connecting portion and the first extension 114 both extend in a direction away from the abutting portion.
[0044] The second extension 115 and the bend of the intermediate connecting part form an arc-starting angle. The arc-starting angle is close to the outermost arc-extinguishing grid plate in the first group of arc-extinguishing grid plates 106, and the tip of the arc-starting angle points to one end of the outermost arc-extinguishing grid plate, which facilitates the transfer of the arc driven arc-starting member 113 to the arc-extinguishing grid plate.
[0045] It should be noted that after the circuit breaker trips, the second extension 115 is provided with an abutment portion that contacts the moving contact 102 to stabilize the arc path. The intermediate connecting portion and the first extension 114 both extend away from this abutment portion, thus creating a spatially conducive channel for arc transfer. In this embodiment, the bend between the second extension 115 and the intermediate connecting portion forms an arc-initiating angle, which serves as the starting point for arc jumping and effectively guides the arc from the moving contact 102 to the arc-extinguishing grid area. This structural design not only enhances the arc-initiating capability but also significantly improves the arc transfer efficiency to the arc-extinguishing assembly 101, shortens the arc-extinguishing time, and improves the breaking reliability and safety of the circuit breaker under high voltage and high current conditions. Simultaneously, the integrated structure of the moving arc-initiating element 113 has good mechanical strength and thermal stability, contributing to improved overall performance and service life of the arc-extinguishing assembly 101.
[0046] Reference Figure 1 , Figure 2 As shown, in one optional implementation, the arc extinguishing assembly 101 includes a stationary arc-inducing component 116; the stationary arc-inducing component 116 includes an inclined connecting section 117 and a bent section 118; the first end of the inclined connecting section 117 is connected to the stationary contact 103, and the second end is connected to the bent section 118; the extension direction of the bent section 118 coincides with the first side edge of the second region 105, and the first end coincides with the second side edge of the second region 105; the first side and the second side of the second region 105 are arranged opposite to each other.
[0047] It should be noted that the first side and the second side are two oppositely set boundaries. Through this design, the stationary arc-guiding element 116 can effectively cooperate with the movement path of the arc on the cathode side (at the stationary contact 103 end) to form a good arc guiding channel.
[0048] Reference Figure 1 As an optional implementation, a third region 119 is divided in the arc-extinguishing chamber; the third region 119 is located between the first region 104 and the second region 105; on the motion plane of the moving contact 102, the third region 119 is provided with a third set of arc-extinguishing grid plates 120.
[0049] The first group of arc-extinguishing grid plates 106, the second group of arc-extinguishing grid plates 107 and the third group of arc-extinguishing grid plates 120 each include multiple arc-extinguishing grid plates arranged in parallel and spaced along the length of the protective housing 100; the connecting line 112 is consistent with the extension direction of the arc-extinguishing grid plates.
[0050] The above-described configuration in this embodiment ensures a high degree of matching between the entire arc extinguishing path and the arc movement path, thereby effectively improving the arc guiding efficiency and breaking capacity. By setting the third region 119 and its corresponding third set of arc extinguishing grids 120, not only is the continuous guiding effect on the arc during its transfer from the anode side to the cathode side enhanced, but the arc extinguishing assembly 101's ability to absorb arc energy and its cooling efficiency are further improved, significantly enhancing the circuit breaker's breaking reliability and safety under high voltage or high current conditions.
[0051] As an optional implementation, the third set of arc-extinguishing grid plates 120 is longer than the first set of arc-extinguishing grid plates 106; the third set of arc-extinguishing grid plates 120 is longer than the second set of arc-extinguishing grid plates 107. The longer third set of arc-extinguishing grid plates 120 has a larger surface area, which helps to absorb and disperse more arc energy, thereby accelerating the arc extinguishing speed and improving the overall arc extinguishing efficiency.
[0052] Reference Figure 1 , Figure 2 As shown, as an optional implementation, it also includes an electromagnetic trip unit 121. The electromagnetic trip unit 121 is connected to the operating mechanism 109. The electromagnetic trip unit 121 drives the operating mechanism 109 to move, causing the moving contact 102 to perform a tripping action. When an abnormal situation such as overcurrent or short circuit occurs in the circuit, the electromagnetic trip unit 121 can respond quickly and drive the operating mechanism 109 to move, thereby triggering the moving contact 102 to perform a tripping action, realizing the automatic disconnection of the circuit.
[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A circuit breaker, characterized in that, The device includes a protective housing (100), an arc-extinguishing assembly (101), a moving contact (102) for connecting the anode, and a stationary contact (103) for connecting the cathode. An arc-extinguishing chamber is formed within the protective housing (100), and the arc-extinguishing chamber is divided into a first region (104) and a second region (105). The first region (104) is near the open position of the moving contact (102), and the second region (105) is near the stationary contact (103). The arc-extinguishing assembly (101) includes a first set of arc-extinguishing grid plates (106) arranged in the first region (104) and a second set of arc-extinguishing grid plates (107) arranged in the second region (105). The number of the first set of arc-extinguishing grid plates (106) is less than the number of the second set of arc-extinguishing grid plates (107). When the device is in the open position, the arc at the moving contact (102) is transferred to the first set of arc-extinguishing grid plates (106).
2. The circuit breaker according to claim 1, characterized in that, It also includes an operating handle (108) and an operating mechanism (109); the protective housing (100) is provided with a first rotating shaft (110) and a second rotating shaft (111) that are parallel and spaced apart; the operating handle (108) has a rotating part sleeved on the first rotating shaft (110), and the operating handle (108) is driven to drive the operating mechanism (109) to move, so that the moving contact (102) moves around the second rotating shaft (111) to open and close the circuit; the center of the first rotating shaft (110) and the center of the second rotating shaft (111) are projected onto the moving plane of the moving contact (102) to form a line (112); the first region (104) and the second region (105) are respectively located on both sides of the line (112).
3. The circuit breaker according to claim 2, characterized in that, During the tripping action, the rotating part of the operating handle (108) moves counterclockwise around the first rotating shaft (110), and the moving contact (102) moves clockwise around the second rotating shaft (111); and the handle operating part on the operating handle (108) and the moving contact (102) are located on the same side of the connecting line (112).
4. The circuit breaker according to any one of claims 1-3, characterized in that, The arc extinguishing assembly (101) includes a movable arc-starting component (113); the movable arc-starting component (113) includes a first extension (114) integrally bent and spaced in parallel and a second extension (115); the first extension (114) coincides with the first side edge of the first region (104), and the extension direction of the second extension (115) coincides with the second side edge of the first region (104).
5. The circuit breaker according to claim 4, characterized in that, The moving arc-starting component (113) also includes an intermediate connecting portion connecting the first extension portion (114) and the second extension portion (115); after the circuit is opened, the second extension portion (115) has an abutting portion that contacts the moving contact (102); the intermediate connecting portion and the first extension portion (114) both extend in a direction away from the abutting portion.
6. The circuit breaker according to any one of claims 1-3, characterized in that, The arc extinguishing assembly (101) includes a stationary arc-inducing component (116); the stationary arc-inducing component (116) includes an inclined connecting section (117) and a bending section (118); the first end of the inclined connecting section (117) is connected to the stationary contact (103), and the second end is connected to the bending section (118); the bending section (118) extends in a direction that coincides with the first side edge of the second region (105), and the first end coincides with the second side edge of the second region (105); the first side and the second side of the second region (105) are arranged opposite to each other.
7. The circuit breaker according to claim 2 or 3, characterized in that, The arc-extinguishing chamber is divided into a third region (119); the third region (119) is located between the first region (104) and the second region (105); on the motion plane of the moving contact (102), the third region (119) is provided with a third set of arc-extinguishing grid plates (120).
8. The circuit breaker according to claim 7, characterized in that, The first group of arc-extinguishing grid plates (106), the second group of arc-extinguishing grid plates (107) and the third group of arc-extinguishing grid plates (120) each include multiple arc-extinguishing grid plates arranged parallel to each other along the length direction of the protective housing (100); the connecting line (112) is consistent with the extension direction of the arc-extinguishing grid plates.
9. The circuit breaker according to claim 7, characterized in that, The length of the third group of arc-extinguishing grid plates (120) is greater than that of the first group of arc-extinguishing grid plates (106); and / or, the length of the third group of arc-extinguishing grid plates (120) is greater than that of the second group of arc-extinguishing grid plates (107).
10. The circuit breaker according to claim 2 or 3, characterized in that, It also includes an electromagnetic trip unit (121), which is connected to the operating mechanism (109). The electromagnetic trip unit (121) drives the operating mechanism (109) to move, so that the moving contact (102) performs a tripping action.