Arc extinguishing structure for circuit breaker and circuit breaker
By designing an arc extinguishing structure in the circuit breaker, using the non-constant gap width and the airflow channel of the inclined static contacts, effective control of the arc is achieved, solving the problem of arc control in high-voltage DC circuit breakers, and improving the performance and safety of the circuit breaker.
Patent Information
- Application Number
- CN202422241858.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-12
AI Technical Summary
In high-voltage DC applications, arc control technology is difficult to effectively control, resulting in contact material erosion, affecting service life and reliability, and at the same time, cost and volume requirements are high.
The arc extinguishing structure design is adopted, including the arc extinguishing chamber, cover plate and side plate, and the return gap and inclined static contacts with non-constant gap width are designed. Combined with the air flow channel and the return channel, forming a closed accommodating chamber and bidirectional inward circulation airflow, controlling the arc to reduce the temperature in the arc extinguishing chamber.
Effectively control arc, reduce contact ablation, improve the performance and safety of circuit breakers, reduce arcing time, and is suitable for high-voltage DC circuit breakers.
Smart Images
Figure CN223181062U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to an arc extinguishing structure for a circuit breaker and a circuit breaker having the arc extinguishing structure. Background Art
[0002] Circuit breakers are an integral component of power systems and are widely used in residential and commercial buildings, industrial production lines, power systems, transportation, and renewable energy generation. In these applications, the primary function of a circuit breaker is to quickly interrupt current flow in the event of a fault such as an overload or short circuit, protecting the circuit and equipment.
[0003] Arcing can occur between the moving and stationary contacts of a circuit breaker during disconnection. This arcing can cause erosion of the contact material, impacting the lifespan and reliability of the circuit breaker. Therefore, controlling this arc is crucial to the performance and safety of the circuit breaker. Arc control technology is even more crucial in high-voltage DC circuit breaker applications.
[0004] Currently, the industry has increasingly higher requirements for circuit breakers, especially high-voltage DC circuit breakers, in terms of cost, size, arcing, etc. Utility Model Content
[0005] In response to the above-mentioned problems and needs, the present disclosure proposes a method that solves the above-mentioned problems and brings other technical effects by adopting the following technical features.
[0006] On the one hand, the present disclosure proposes an arc extinguishing structure for a circuit breaker, wherein the circuit breaker has a static contact, and the arc extinguishing structure includes an arc extinguishing chamber and a first cover plate and a second cover plate. The arc extinguishing chamber includes a plurality of arc extinguishing plates spaced apart from each other, and a first arc extinguishing chamber side plate and a second arc extinguishing chamber side plate respectively located on both sides of the plurality of arc extinguishing plates. An airflow channel for introducing airflow into the arc extinguishing chamber is formed between the first cover plate and the second cover plate. A first return gap for airflow to flow back to the arc extinguishing chamber is provided between the first arc extinguishing chamber side plate and the first cover plate, and a second return gap for airflow to flow back to the arc extinguishing chamber is provided between the second arc extinguishing chamber side plate and the second cover plate, and wherein, for at least one of the first return gap and the second return gap, the gap width is a non-constant value, and the gap width in the area away from the static contact is greater than or equal to the gap width in the area close to the static contact.
[0007] According to a preferred solution, for at least one of the first return gap and the second return gap, the gap width gradually increases in a direction away from the static contact.
[0008] According to a preferred embodiment, at least one of the first return gap and the second return gap includes a first region close to the static contact, a second region far from the static contact, and an intermediate region located between the first region and the second region, wherein the first gap width in the first region is smaller than the second gap width in the second region.
[0009] According to a preferred embodiment, the gap width of the intermediate region gradually changes from the first gap width to the second gap width.
[0010] According to a preferred embodiment, the downstream edge of the first cover plate has a first cover plate protrusion, and the first return gap is formed between the upstream edge of the first arc extinguishing chamber side plate and the first cover plate protrusion; and / or the downstream edge of the second cover plate has a second cover plate protrusion, and the second return gap is formed between the upstream edge of the second arc extinguishing chamber side plate and the second cover plate protrusion.
[0011] According to a preferred embodiment, the first cover plate protrusion has a varying protrusion height; and / or
[0012] The second cover plate protrusion has a varying protrusion height.
[0013] According to a preferred embodiment, the rear end of the arc extinguishing chamber, the first arc extinguishing chamber side plate, and the second arc extinguishing chamber side plate are all spaced apart from the inner wall of the housing, and at the rear end of the arc extinguishing chamber, the housing does not have an air flow outlet, so that the air flow ejected from the rear end of the arc extinguishing chamber travels to the first channel between the first arc extinguishing chamber side plate and the inner wall of the housing and the second channel between the second arc extinguishing chamber side plate and the inner wall of the housing, wherein the first channel and the second channel are respectively communicated with the first return gap and the second return gap.
[0014] According to a preferred embodiment, the arc extinguishing structure includes a static contact, and the static contact includes a main body portion and a silver point portion connected to the silver point area, and the silver point portion is inclined at an angle with respect to the main body portion.
[0015] According to a preferred embodiment, the angle is an angle greater than 0° and less than 10°.
[0016] The present disclosure also provides a circuit breaker, which includes the arc extinguishing structure as described in any one of the foregoing.
[0017] In the following, the optimal embodiments for implementing the present disclosure will be described in more detail with reference to the accompanying drawings, so as to easily understand the features and advantages of the present disclosure. Description of the Drawings
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments of the present disclosure will be briefly introduced below. Among them, the drawings are only used to show some embodiments of the present disclosure, rather than limiting all embodiments of the present disclosure thereto.
[0019] Figure 1 Shows a partial view of a circuit breaker, which is equipped with an arc extinguishing structure according to a preferred embodiment of the present disclosure;
[0020] Figure 2 Shows a perspective view of the arc extinguishing chamber of the arc extinguishing structure;
[0021] Figure 3 Shows a perspective view of the first cover plate;
[0022] Figure 4 Shows a cross-sectional view of the arc extinguishing structure of the present disclosure;
[0023] Figure 5 Shows Figure 4 Partial enlarged view of.
[0024] List of reference numerals
[0025] 10 Arc extinguishing chamber
[0026] 11 Arc extinguishing piece
[0027] 12 First arc extinguishing chamber side plate
[0028] 13 Second arc extinguishing chamber side plate
[0029] 14 First cover plate
[0030] 141 First cover plate protrusion
[0031] 1411 First section
[0032] 1412 Intermediate section
[0033] 1413 Second section
[0034] 15 Second cover plate
[0035] 151 Second cover plate protrusion
[0036] 20 Housing
[0037] 26 First side wall
[0038] 27 Second side wall
[0039] 28 First channel
[0040] 29 Second channel
[0041] 30 First region
[0042] 31 Intermediate region
[0043] 32 Second region
[0044] 33 First return gap
[0045] 34 Second reflux gap
[0046] 40 Static contact
[0047] 41 Main body part
[0048] 42 Silver point part
[0049] 50 Moving contact Detailed implementation manners
[0050] In order to make the objectives, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of specific embodiments of the present disclosure. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts fall within the scope of protection of the present disclosure.
[0051] Compared with the embodiments shown in the accompanying drawings, the feasible implementation manners within the scope of protection of the present disclosure may have fewer components, have other components not shown in the accompanying drawings, different components, components arranged differently or components connected differently, etc. In addition, two or more components in the accompanying drawings may be implemented in a single component, or a single component shown in the accompanying drawings may be implemented as multiple separate components.
[0052] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second" and similar terms used in the specification and claims of the patent application of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not necessarily indicate a quantity limitation. The terms "comprising" or "including" and similar terms mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0053] The present disclosure relates to an arc extinguishing structure for a circuit breaker and a circuit breaker having the arc extinguishing structure. Its features will be described below in conjunction with the accompanying drawings. Among them, Figure 1A partial view of a circuit breaker is shown, which is equipped with an arc extinguishing structure according to a preferred embodiment of the present disclosure. Figure 2 A perspective view of the arc extinguishing chamber 10 of the arc extinguishing structure is shown. Figure 3 A perspective view of the first cover plate 14 is shown. Figure 4 A cross-sectional view of the arc extinguishing structure of the present disclosure is shown. Figure 5 Shows Figure 4 A partial enlarged view of
[0054] Among them, in the specific embodiment shown in the drawings, the circuit breaker is a circuit breaker with a double-break structure. The circuit breaker correspondingly has two sets of arc extinguishing structures accommodated in two internal cavities of the housing 20 for the purpose of arc extinguishing of two sets of moving and static contacts 40 respectively. However, the arc extinguishing structure of the present disclosure can also be applied to a circuit breaker with a single-break structure, in which only one set of arc extinguishing structure is provided.
[0055] As Figure 1 shown, the circuit breaker may include a housing 20 and two arc extinguishing chambers 10. Among them, the two arc extinguishing chambers 10 are respectively accommodated in two accommodating cavities of the housing 20.
[0056] The moving contact 50 and the static contact 40 of the circuit breaker are used to connect or disconnect the circuit. In Figure 1 the shown drawings, the static contact 40 and the moving contact 50 are in a state of being engaged with each other. Among them, when the moving contact 50 and the static contact 40 are separated, an arc will be generated. The arc heats the gas in the cavity, thereby causing the air pressure in this area to rise and forming an air flow flowing into the arc extinguishing chamber 10. In the present disclosure, the area where the arc is generated when the moving contact 50 and the static contact 40 are separated is called the arc generation area. The air flow with charged particles will flow from this arc generation area towards the arc extinguishing chamber 10, enter between the arc extinguishing plates 11 of the arc extinguishing chamber 10 and continue to flow. The present disclosure does not limit the specific structures of the moving contact 50 and the static contact 40.
[0057] The arc extinguishing chamber 10 has a front end close to the arc generation area and a rear end far from the arc generation area. The arc extinguishing chamber 10 includes a first arc extinguishing chamber side plate 12, a second arc extinguishing chamber side plate 13 extending between its front end and rear end and arranged in parallel, and a plurality of arc extinguishing plates 11 spaced apart from each other and held by the first arc extinguishing chamber side plate 12 and the second arc extinguishing chamber side plate 13. Among them, the plurality of arc extinguishing plates 11 can be separated from each other at uniform intervals, and both side edges of the arc extinguishing plates 11 are held by the first arc extinguishing chamber side plate 12 and the second arc extinguishing chamber side plate 13. Specifically, as Figure 2 shown, each end of each arc extinguishing plate 11 may be provided with a tab, and the tab is inserted into a corresponding opening in the first arc extinguishing chamber side plate 12 and the second arc extinguishing chamber side plate 13, so as to be held by the first arc extinguishing chamber side plate 12 and the second arc extinguishing chamber side plate 13.
[0058] The arc extinguishing structure further includes a first cover plate 14 and a second cover plate 15. The first cover plate 14 and the second cover plate 15 can be arranged in parallel, so as to form an air flow channel between the first cover plate 14 and the second cover plate 15 for introducing air flow into the arc extinguishing chamber 10. Among them, Figure 5 The state in which the air flow enters the arc extinguishing chamber 10 along the air flow channel is schematically shown by a solid arrow in the figure.
[0059] Preferably, in the present disclosure, the arc extinguishing structure is designed such that the rear end of the arc extinguishing chamber 10, the first arc extinguishing chamber side plate 12 and the second arc extinguishing chamber side plate 13 are all spaced apart from the inner wall of the housing 20 that defines the internal cavity, so as to provide a space for the air flow to flow out. At the same time, at the rear end of the arc extinguishing chamber 10, the housing 20 does not have an air flow outlet, that is, there is a solid structure of the housing 20 at a certain distance from the rear end of the arc extinguishing chamber 10, so that the air flow ejected from the rear end of the arc extinguishing chamber 10 cannot continue to flow backward all the time, but will be blocked by the structure of the housing 20 at a certain distance from the rear end of the arc extinguishing chamber 10, and thus is divided into two paths to enter the first channel 28 between the first arc extinguishing chamber side plate 12 and the inner wall of the housing 20 and the second channel 29 between the second arc extinguishing chamber side plate 13 and the inner wall of the housing 20. Among them, the wall portions of the housing 20 on both sides of the arc extinguishing chamber 10 can be respectively referred to as a first side wall 26 and a second side wall 27, wherein the first channel 28 is formed between the first arc extinguishing chamber side plate 12 and the first side wall 26, and the second channel 29 is formed between the second arc extinguishing chamber side plate 13 and the second side wall 27.
[0060] In the present disclosure, there is a first return gap 33 for the air flow to return to the arc extinguishing chamber 10 between the first arc extinguishing chamber side plate 12 and the first cover plate 14, and there is a second return gap 34 for the air flow to return to the arc extinguishing chamber 10 between the second arc extinguishing chamber side plate 13 and the second cover plate 15. Thus, the gas traveling along the first channel 28 can return to the arc extinguishing chamber 10 through the first return gap 33, and the gas traveling along the second channel 29 can return to the arc extinguishing chamber 10 through the second return gap 34, so as to form Figure 5 the two-way internal circulation return shown by the dashed arrow in the figure.
[0061] By adopting a closed accommodation cavity and the double-return flow of the air flow, the present disclosure can effectively keep the arc in the arc extinguishing chamber 10, prevent it from flowing back in the direction of the arc generation area, reduce the temperature, shorten the contact arcing time, and at the same time increase the arc voltage, reduce the contact ablation, and effectively control the problem of arc flash.
[0062] Among them, the present disclosure proposes that for at least one of the first return gap 33 and the second return gap 34, the gap width is a non-constant value, and the gap width in the region far from the static contact 40 is greater than or equal to the gap width in the region close to the static contact 40. Preferably, both the first return gap 33 and the second return gap 34 satisfy that the gap width is non-constant and the gap width in the region far from the static contact 40 is greater than the gap width in the region close to the static contact 40. As can be seen from Figure 2 the change in the width of the first return gap 33. In the direction shown in the attached drawing, the gap width below the first return gap 33 is narrower, and the risk width above is wider.
[0063] In this article, the "gap width" can be defined by the minimum distance between the first arc extinguishing chamber side plate 12 and the first cover plate 14.
[0064] In this article, the meaning that the gap width is a non-constant value and the gap width in the region far from the static contact 40 is greater than or equal to the gap width in the region close to the static contact 40 is that the entire return gap does not have a constant size along the entire length of the return gap, but generally has a wider width in the region far from the static contact 40, while there may be one or more local regions with a constant width. That is, it is not required that the gap width in any region far from the static contact 40 must necessarily be greater than the gap width in any region close to the static contact 40.
[0065] In a preferred embodiment, along the length of the entire return gap, the gap width gradually increases in the direction away from the static contact 40.
[0066] In another preferred embodiment, along the length of the entire return gap, the return gap can be divided into multiple regions, each region having a fixed or variable gap width, and generally the region farther from the static contact 40 has a larger gap width. Among them, for the region with a variable gap width, the average value of the gap width can be regarded as the gap width of this region.
[0067] In Figure 2 the shown preferred embodiment, the return gap has three regions: a first region 30 close to the static contact 40, a second region 32 far from the static contact 40, and an intermediate region 31 located between the first region 30 and the second region 32. Among them, the first gap width in the first region 30 is smaller than the second gap width in the second region 32. The gap width of the intermediate region 31 preferably gradually changes from the first gap width to the second gap width.
[0068] Setting the gap width of the return flow gap in the form that the farther away from the static contact 40, the wider it is as described above can make the utilization of the arc extinguishing chamber 10 more sufficient, so that the circuit breaker has excellent performance in aspects such as arc flash control and arcing time.
[0069] Preferably, the downstream edge of the first cover plate 14 has a first cover plate protrusion 141. The first return flow gap 33 is formed between the upstream edge of the first arc extinguishing chamber side plate 12 and the first cover plate protrusion 141. At the same time, preferably, the downstream edge of the second cover plate 15 has a second cover plate protrusion 151, and the second return flow gap 34 is formed between the upstream edge of the second arc extinguishing chamber side plate 13 and the second cover plate protrusion 151. Here, the upstream and downstream are defined according to the air flow direction. Relatively speaking, the upstream is the direction closer to the arc generation area, and the downstream is the direction farther away from the arc generation area. Figure 5 A cross-sectional view showing the upstream edge of the cover plate protrusion and the arc extinguishing chamber side plate is shown. The solid arrows in this figure point from upstream to downstream. As Figure 5 shown, the upstream edge of the arc extinguishing chamber side plate preferably has a hook-like structure to guide the air flow through the inclined surface of the hook-like structure. At the same time, the first cover plate protrusion 141 and the second cover plate protrusion 151 may also have inclined surfaces for guiding the air flow.
[0070] Preferably, the upstream edges of the first arc extinguishing chamber side plate 12 and the second arc extinguishing chamber side plate 13 have uniform and constant dimensions in their length directions, and the aforementioned change in the gap width of the first return flow gap 33 and the second return flow gap 34 is achieved by changing the protrusion heights of the first cover plate protrusion 141 and the second cover plate protrusion 151. Preferably as Figure 3 shown, which shows a three-dimensional view of the first cover plate protrusion 141. The first cover plate protrusion 141 includes three sections, which are respectively called the first section 1411, the middle section 1412, and the second section 1413. The first section 1411 has a constant first protrusion height, the second section 1413 has a constant second protrusion height greater than the first protrusion height, and the protrusion height of the middle section 1412 gradually changes from the first protrusion height to the second protrusion height. Since the upstream edge of the first arc extinguishing chamber side plate 12 has uniform and constant dimensions in its length direction, the gap width of the first return flow gap 33 formed between the upstream edge of the first arc extinguishing chamber side plate 12 and the first cover plate protrusion 141 shows the change described above.
[0071] Among them, since the main plane of the cover plate protrusion away from the cover plate body may be an inclined surface, the height of the cover plate protrusion can be defined by the minimum distance, the maximum distance, the distance at a certain specific position, etc. that the corresponding cover plate protrusion is higher than the main plane of the cover plate body. The measurement direction of the height is in Figure 5 the direction perpendicular to the solid arrow.
[0072] The figure does not show the variation of the width of the second backflow gap 34. Preferably, the second backflow gap 34 is the same as the first backflow gap 33.
[0073] The present disclosure also improves the static contact 40 of the circuit breaker. Figure 1 As shown, the static contact 40 includes a main body portion 41 and a silver point portion 42 connected to the silver point area, and the main body portion 41 and the silver point portion 42 are connected together by a bent connection portion. Usually, the main body portion 41 and the silver point portion 42 are arranged in parallel. The present disclosure proposes that the silver point portion 42 is tilted at an angle relative to the main body portion 41. Preferably, the angle is an angle greater than 0° and less than 10°, for example, an angle greater than 2° and less than 8°, or an angle greater than 3° and less than 7°, or an angle greater than 4° and less than 6°. Preferably, the angle is about 5°. The inclined arrangement of the static contact 40 can effectively compensate for problems such as overtravel loss.
[0074] In the preferred solution of the inclined arrangement of the static contact 40, the end arc-extinguishing piece 11 located at the end closest to the static contact 40 among the multiple arc-extinguishing pieces 11 is preferably arranged parallel to the silver point portion 42 of the static contact 40, while the other arc-extinguishing pieces 11 are parallel to the main body portion 41 of the static contact 40. Thus, the end arc-extinguishing piece 11 is inclined relative to the other arc-extinguishing pieces 11.
[0075] In the specific embodiment shown in the drawings, the circuit breaker is a dual-breakpoint circuit breaker, and accordingly has two sets of arc-extinguishing structures housed in two internal cavities of the housing 20, respectively for extinguishing arcs at the two static contacts 40. However, the arc-extinguishing structure disclosed herein can also be applied to a single-breakpoint circuit breaker, in which only one set of arc-extinguishing structures is provided.
[0076] The arc extinguishing structure disclosed herein is applicable to both DC circuit breakers and AC circuit breakers, and is particularly applicable to high-voltage DC circuit breakers, such as 2P 1500V high-voltage DC circuit breakers.
[0077] The exemplary implementation schemes proposed in the present disclosure are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the scope of protection of the present disclosure, which is determined by the appended claims.
Claims
1. An arc extinguishing structure for a circuit breaker, the circuit breaker having a static contact (40), characterized in that, The arc extinguishing structure includes: An arc extinguishing chamber (10), including a plurality of arc extinguishing plates (11) spaced apart from each other, and a first arc extinguishing chamber side plate (12) and a second arc extinguishing chamber side plate (13) respectively located on both sides of the plurality of arc extinguishing plates (11); A first cover plate (14) and a second cover plate (15), between which an air flow channel for introducing air flow into the arc extinguishing chamber (10) is formed; Wherein, there is a first return gap (33) for the air flow to return to the arc extinguishing chamber (10) between the first arc extinguishing chamber side plate (12) and the first cover plate (14), and a second return gap (34) for the air flow to return to the arc extinguishing chamber (10) between the second arc extinguishing chamber side plate (13) and the second cover plate (15), and wherein, for at least one of the first return gap (33) and the second return gap (34), the gap width is a non-constant value, and the gap width in the area away from the static contact (40) is greater than or equal to the gap width in the area close to the static contact (40).
2. The arc extinguishing structure according to claim 1, characterized in that For at least one of the first return gap (33) and the second return gap (34), the gap width gradually increases in the direction away from the static contact (40).
3. The arc extinguishing structure according to claim 1, characterized in that At least one of the first return gap (33) and the second return gap (34) includes a first area (30) close to the static contact (40), a second area (32) away from the static contact (40), and an intermediate area (31) located between the first area (30) and the second area (32), wherein the constant first gap width in the first area (30) is less than the constant second gap width in the second area (32).
4. The arc extinguishing structure according to claim 3, characterized in that The gap width of the intermediate area (31) gradually changes from the first gap width to the second gap width.
5. The arc extinguishing structure according to any one of claims 1-4, characterized in that The downstream edge of the first cover plate (14) has a first cover plate protrusion (141), and the first return gap (33) is formed between the upstream edge of the first arc extinguishing chamber side plate (12) and the first cover plate protrusion (141); and / or The downstream edge of the second cover plate (15) has a second cover plate protrusion (151), and the second return gap (34) is formed between the upstream edge of the second arc extinguishing chamber side plate (13) and the second cover plate protrusion (151).
6. The arc extinguishing structure according to claim 5, characterized in that The first cover plate protrusion (141) has a varying protrusion height; and / or The second cover plate protrusion (151) has a varying protrusion height.
7. The arc extinguishing structure according to claim 5, characterized in that The rear end of the arc extinguishing chamber (10), the first arc extinguishing chamber side plate (12) and the second arc extinguishing chamber side plate (13) are all spaced apart from the inner wall of the housing (20), and at the rear end of the arc extinguishing chamber (10), the housing (20) does not have an air flow outlet, so that the air flow ejected from the rear end of the arc extinguishing chamber (10) travels to the first channel (28) between the first arc extinguishing chamber side plate (12) and the inner wall of the housing (20) and the second channel (29) between the second arc extinguishing chamber side plate (13) and the inner wall of the housing (20), wherein the first channel (28) and the second channel (29) are respectively communicated with the first return gap (33) and the second return gap (34).
8. The arc extinguishing structure according to claim 1, wherein the arc extinguishing structure includes a static contact (40), the static contact (40) includes a main body portion (41) and a silver point portion (42) connected to the silver point area, and the silver point portion (42) is inclined at an angle with respect to the main body portion (41).
9. The arc extinguishing structure according to claim 8, wherein the angle is an angle greater than 0° and less than 10°.
10. A circuit breaker, characterized in that, including the arc extinguishing structure according to any one of claims 1-9.