circuit breaker

Abstract

The present disclosure relates to a circuit breaker comprising a first end and a second end opposite each other, and located between the first and second ends: a first set of moving and stationary contacts; a first arc chute having a front side proximate to the first set of moving and stationary contacts and a back side distal to the first set of moving and stationary contacts; a second set of moving and stationary contacts; a second arc chute having a front side proximate to the second set of moving and stationary contacts and a back side distal to the second set of moving and stationary contacts. Wherein the circuit breaker further has a first gas flow channel originating from the back side of the first arc chute, and a second gas flow channel originating from the back side of the second arc chute, and the outlets of the first and second gas flow channels are both provided at the second end. Further provided at the first end is a first anti-spray element located between the back side of the first arc chute and an outer surface of a first end wall of the first end.

Description

Technical Field

[0001] This disclosure relates to circuit breakers, and in particular to the arc-extinguishing structure design of circuit breakers. Background Technology

[0002] In electrical systems, circuit breakers are crucial protective devices, and their safety is paramount. However, existing circuit breakers pose safety hazards during operation. When a short circuit or other fault occurs, the circuit breaker disconnects the circuit, generating high-temperature, high-pressure gas within the arc-extinguishing chamber. This gas, when ejected from the chamber's outlet, often carries an electric arc, creating a phenomenon known as "arc ejection." Arc ejection not only damages the circuit breaker itself but also severely impacts other nearby components, causing burnout, short circuits, and ultimately, more widespread electrical faults.

[0003] To reduce the impact of arcing on other components in the electrical cabinet, a certain safe arcing distance is usually set for the circuit breaker or a product terminal cover is added. However, this will increase the overall size of the circuit breaker, limiting its application in compact spaces.

[0004] Therefore, how to effectively reduce the impact of arcing on components near the circuit breaker without increasing the size of the circuit breaker has become an urgent technical problem to be solved. Summary of the Invention

[0005] To address the aforementioned problems and needs, this disclosure proposes a circuit breaker comprising a first end and a second end opposite to each other, and the following components located between the first end and the second end: a first set of moving and stationary contacts; a first arc-extinguishing chamber having a front side near the first set of moving and stationary contacts and a rear side away from the first set of moving and stationary contacts; a second set of moving and stationary contacts; and a second arc-extinguishing chamber having a front side near the second set of moving and stationary contacts and a rear side away from the second set of moving and stationary contacts. The circuit breaker further comprises a first airflow channel originating from the rear side of the first arc-extinguishing chamber and a second airflow channel originating from the rear side of the second arc-extinguishing chamber, with the outlets of both the first and second airflow channels located at the second end. A first anti-blowout element is provided at the first end, located between the rear side of the first arc-extinguishing chamber and the outer surface of the first end wall of the first end.

[0006] According to a preferred embodiment, a groove is provided in the first end wall of the first end, and the first anti-spray arc element is installed in the groove.

[0007] According to a preferred embodiment, the first anti-spray arc element is a plate-shaped element with multiple through holes.

[0008] According to a preferred embodiment, the first anti-spray arc element is a metal woven mesh or a metal perforated plate.

[0009] According to a preferred embodiment, the second airflow channel leads to the same outlet as the first airflow channel.

[0010] According to a preferred embodiment, a second anti-jet arc element is provided in the intersection area of ​​the first airflow channel and the second airflow channel.

[0011] According to a preferred embodiment, the second anti-blowout element includes one or more anti-blowout mesh surfaces, each of which is arranged to be traversed by gas in the first airflow channel and / or the second airflow channel.

[0012] According to a preferred embodiment, at least one of the one or more anti-blowout mesh surfaces also serves as an airflow guiding surface, the airflow guiding surface having a curved guide surface to guide the gas in the second airflow channel toward the outlet.

[0013] According to a preferred embodiment, the second anti-blowout element further includes a fixing surface that engages with the channel sidewall to facilitate the fixing of the second anti-blowout element.

[0014] According to a preferred embodiment, the second anti-spray arc element is formed by bending a metal plate-shaped element.

[0015] According to a preferred embodiment, the outlet includes a first outlet and a second outlet, and the confluence area includes a first confluence area and a second confluence area leading to the first outlet and the second outlet respectively. A second anti-spray arc element is provided in both the first confluence area and the second confluence area.

[0016] According to a preferred embodiment, the outlet is located at the bottom of the circuit breaker.

[0017] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present disclosure can be readily understood. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0019] Figure 1 This is a cross-sectional view of a circuit breaker according to a preferred embodiment of the present disclosure;

[0020] Figure 2 and Figure 3 This is a partial view of a circuit breaker according to a preferred embodiment of the present disclosure, particularly showing the mounting position of the first anti-arc ejection element;

[0021] Figure 4An exemplary embodiment of the first anti-arc spray element of this disclosure is shown;

[0022] Figure 5 An exemplary embodiment of the second anti-arc spray element of this disclosure is shown;

[0023] Figure 6 This is a partial view of a circuit breaker according to a preferred embodiment of the present disclosure, particularly showing the intersection of the first airflow passage and the second airflow passage;

[0024] Figure 7 This is a partial view of a circuit breaker according to a preferred embodiment of the present disclosure, particularly showing the end branch structure of the second airflow channel;

[0025] Figure 8 This is a partial view of a circuit breaker according to a preferred embodiment of the present disclosure, particularly showing the end branch structure of the first airflow channel.

[0026] List of reference numerals

[0027] 10 First end

[0028] 11 First stationary contact

[0029] 111 stationary contact assembly

[0030] 12 First moving contact

[0031] 13 First Arc Extinguishing Chamber

[0032] 131 Front side of the first arc-extinguishing chamber

[0033] 132 Rear side of the first arc-extinguishing chamber

[0034] 14 First end wall

[0035] 15 First airflow channel

[0036] 151 First airway branch

[0037] 16-partition structure

[0038] 161 Guide Surface

[0039] 162 Card Unit

[0040] 20 Second end

[0041] 21 Second stationary contact

[0042] 22 Second moving contact

[0043] 23 Second Arc Extinguishing Chamber

[0044] 24 Second end wall

[0045] 231 Front side of the second arc-extinguishing chamber

[0046] 232 Rear side of the second arc-extinguishing chamber

[0047] 25 Second airflow channel

[0048] 251 First Channel Section

[0049] 252 Second Channel Section

[0050] 26 strip-shaped guide sections

[0051] 30 exports

[0052] 40 First anti-spray arc element

[0053] 50 Second anti-spray arc element

[0054] 51 First anti-blowout arc mesh

[0055] 52 Second anti-spray arc mesh surface

[0056] 53 Third blowout protection mesh

[0057] 54 Fourth Blowout Protection Mesh

[0058] 55 fixed surface Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0060] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0061] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0062] This disclosure relates to a circuit breaker, particularly an arc-extinguishing structure design for a double-break circuit breaker.

[0063] For clarity, references will be provided. Figure 1 The present disclosure describes the scheme using a coordinate system. The x-direction corresponds to the length direction of the circuit breaker. The two ends of the circuit breaker, namely the first end 10 and the second end 20, are spaced apart from each other in the x-direction. The y-direction corresponds to the height direction of the circuit breaker, with the top and bottom of the circuit breaker spaced apart from each other in the y-direction. The z-direction corresponds to the thickness direction of the circuit breaker, with the two main planes of the circuit breaker housing spaced apart from each other in the z-direction. It is understood that in actual use of the circuit breaker, the horizontally shown x-direction is not necessarily parallel to the ground.

[0064] like Figure 1 As shown, the double-break circuit breaker includes two sets of moving and stationary contacts, referred to as the first set of moving and stationary contacts and the second set of moving and stationary contacts, respectively. The first set of moving and stationary contacts includes a first stationary contact 11 and a first moving contact 12. The second set of moving and stationary contacts includes a second stationary contact 21 and a second moving contact 22. In this paper, the first stationary contact 11 and the second stationary contact 21 can be collectively referred to as stationary contacts, and the second stationary contact 21 and the second moving contact 22 can be collectively referred to as moving contacts.

[0065] Moving and stationary contacts are crucial components of a circuit breaker, working together to control the connection and disconnection of the circuit. When connection or disconnection occurs, the first stationary contact 11 and the second stationary contact 21 remain stationary, while the first moving contact 12 and the second moving contact 22 simultaneously move toward or away from the first stationary contact 11 and the second stationary contact 21. For example, the first moving contact 12 and the second moving contact 22 can rotate about a common axis to engage or disengage from the first stationary contact 11 and the second stationary contact 21, thereby connecting or disconnecting the circuit. Figure 1The first set of moving and stationary contacts and the second set of moving and stationary contacts of the circuit breaker are both in the engaged state.

[0066] During the separation of the moving and stationary contacts, an electric arc can easily be generated between them. In this article, the area near the moving and stationary contacts where an electric arc forms is referred to as the arc generation region. The generation of an electric arc can damage the moving and stationary contacts and / or other components of the circuit breaker.

[0067] To extinguish the electric arc, the circuit breaker also includes a first arc-extinguishing chamber 13 near the first set of moving and stationary contacts and a second arc-extinguishing chamber 23 near the second set of moving and stationary contacts. In this document, the first arc-extinguishing chamber 13 and the second arc-extinguishing chamber 23 can be collectively referred to as arc-extinguishing chambers.

[0068] The first arc-extinguishing chamber 13 has a front side 131 near the first set of moving and stationary contacts and a rear side 132 away from the first set of moving and stationary contacts. Similarly, the second arc-extinguishing chamber 23 has a front side 231 near the second set of moving and stationary contacts and a rear side 232 away from the second set of moving and stationary contacts. Each arc-extinguishing chamber is located downstream of the corresponding arc-generating region, and the arc can enter the arc-extinguishing chamber through the front side of the corresponding arc-extinguishing chamber. The arc-extinguishing chambers are used, for example, to extend the arc length, thereby extinguishing the arc.

[0069] This disclosure designs two special airflow channels for the circuit breaker: a first airflow channel 15 starting at the rear side 132 of the first arc-extinguishing chamber, and a second airflow channel 25 starting at the rear side 232 of the second arc-extinguishing chamber 23. The first airflow channel 15 and the second airflow channel 25 can be collectively referred to as airflow channels. The airflow channels of this disclosure have a relatively long length. As the gas carrying charged particles travels along the airflow channels, the charged particles are gradually consumed, thereby reducing the impact of the electric arc on nearby equipment. Specifically, this disclosure proposes that the outlets 30 of both the first airflow channel 15 and the second airflow channel 25 be located at the same end of the circuit breaker, which is the second end 20 in the embodiment shown in the figures. Simultaneously, this disclosure proposes that a first anti-arc ejection element 40 be provided at the first end 10, which does not have an airflow outlet, behind the outer surface of the first end wall 14 of the first end 10, between the rear side 132 of the first arc-extinguishing chamber and the first end 10. Through this design, a good overall arc-extinguishing effect can be achieved, with zero arcing at the first end and only a very small amount of arc at the second end.

[0070] This disclosure, by placing the outlets 30 of both the first airflow channel 15 and the second airflow channel 25 at the same end of the circuit breaker, ensures that at least one airflow channel—the first airflow channel in the embodiment shown in the figures—fully utilizes the x-direction dimensions of the circuit breaker, allowing for a longer length and thus reducing ejected metal particles. Furthermore, compared to the conventional approach of placing two outlets at two different ends, placing the outlets at the same end avoids both ends of the circuit breaker being affected by airflow, eliminating the need for large safety distances at both ends and enabling overall miniaturization of the circuit breaker. Simultaneously, by placing a first anti-arc ejection element 40 behind the first arc-extinguishing chamber at the first end 10, which does not have an airflow outlet, arcing caused by the internal pressure forcing open the circuit breaker housing at the first end during short-circuit breaking can be prevented, promoting a zero-arc ejection effect.

[0071] In the embodiment shown in the attached drawings, the outlets of both airflow channels are located at the second end 20 of the circuit breaker, and a first anti-arc ejection element 40 is provided at the first end 10. It can be understood that, in embodiments not shown, the outlets of the first airflow channel 15 and the second airflow channel 25 may both be located at the first end 10, and the first anti-arc ejection element 40 may be provided at the second end 20.

[0072] The first anti-arc ejection element 40 can, in principle, be any element capable of achieving an arc-extinguishing effect, such as a metal mesh, an arc-extinguishing grid, etc. Preferably, the first anti-arc ejection element 40 is a plate-shaped element with multiple through holes made of metal material, such as a metal woven mesh, a perforated metal plate, or a similar structure.

[0073] Figure 4 An exemplary embodiment of the first anti-arc ejection element 40 of this disclosure is shown. In this embodiment, the first anti-arc ejection element 40 is a metal plate-shaped element with a uniform thickness and a plurality of through holes. Such a structure is simple, easy to manufacture, and can effectively prevent the arc from flying out at the moment the circuit breaker housing at the first end is forced open by internal pressure during the short-circuit breaking of the circuit breaker.

[0074] Figure 2 and Figure 3 This is a partial view of a circuit breaker according to a preferred embodiment of the present disclosure, specifically showing the mounting position of the first arc-prevention element 40. It can be seen that the first end wall 14 of the first end portion 10 has a certain thickness, in which a groove is provided, and the first arc-prevention element 40 is mounted in the groove. Thus, the first arc-prevention element 40 can be securely and effectively fixed in the circuit breaker housing. In a preferred embodiment where the circuit breaker comprises two half-shells mating together, a groove can be provided in the wall of each half-shell, and the grooves of the two half-shells mat together to form a substantially enclosed receiving space for accommodating the first arc-prevention element 40.

[0075] Understandable Figure 2 and Figure 3 The examples shown are all double-pole circuit breakers, and the foregoing description applies to either pole of the double-pole circuit breaker. The circuit breaker disclosed herein can also be a single-pole circuit breaker, a three-pole circuit breaker, etc.

[0076] Preferably, at least one of the first airflow channel 15 and the second airflow channel 25 has one or more bends. By providing bends, the length of the airflow channel can be increased within the limited space of the circuit breaker, which is more conducive to cooling and consuming charged particles, thereby improving the arc extinguishing effect.

[0077] Preferably, the first airflow passage 15 includes a vertical portion located near the rear side of the first arc-extinguishing chamber and a horizontal portion extending substantially along the bottom wall of the circuit breaker toward the outlet 30.

[0078] As previously described, in a preferred embodiment, the second airflow channel 25 shares the same outlet 30 as the first airflow channel 15. The outlet 30 may be specifically implemented as a single outlet. In other embodiments, the outlet 30 includes two or more independent outlets. In the preferred embodiment shown in the figures, for each pole of the circuit breaker, the outlet 30 includes a first outlet and a second outlet spaced apart in the thickness direction of the circuit breaker.

[0079] In a preferred embodiment, the airflow in the second airflow channel 25 and the first airflow channel 15 converge and then lead to the same outlet. This disclosure refers to the location where the second airflow channel 25 and the first airflow channel 15 converge as the convergence region. According to a preferred embodiment of this disclosure, a second anti-arc spray element 50 is provided in the convergence region of the first airflow channel 15 and the second airflow channel 25. The first airflow channel 15 and the second airflow channel 25 may converge in one or more convergence regions. Preferably, one second anti-arc spray element 50 is provided at each convergence region.

[0080] The second anti-arc ejection element 50 can, in principle, be any element capable of achieving an arc-extinguishing effect, such as a metal mesh, an arc-extinguishing grid, etc. Preferably, the second anti-arc ejection element 50 includes one or more anti-arc ejection mesh surfaces. The anti-arc ejection mesh surface is a plate-like or sheet-like structure with multiple through holes. Each anti-arc ejection mesh surface is arranged such that gas from the first airflow channel 15 and / or the second airflow channel 25 passes through it. During the process of the gas passing through the second anti-arc ejection element 50, the charged particles are rapidly cooled, thereby reducing the ejection of charged particles.

[0081] Figure 5A preferred embodiment of the second anti-blowout element 50 is shown. The second anti-blowout element 50 includes four anti-blowout mesh surfaces: a first anti-blowout mesh surface 51, a second anti-blowout mesh surface 52, a third anti-blowout mesh surface 53, and a fourth anti-blowout mesh surface 54. Preferably, adjacent anti-blowout mesh surfaces are connected to each other at an acute angle. For example, the first anti-blowout mesh surface 51 and the second anti-blowout mesh surface 52 are connected at an acute angle, and the third anti-blowout mesh surface 53 and the fourth anti-blowout mesh surface 54 are connected at an acute angle.

[0082] In other embodiments not shown, the second anti-blowout element 50 may have more or fewer anti-blowout mesh surfaces, and the anti-blowout mesh surfaces may have other arrangements, as long as airflow can be achieved through the anti-blowout mesh surfaces.

[0083] Preferably, at least one of the one or more anti-blowout mesh surfaces also serves as an airflow guiding surface. Figure 5 In this embodiment, the second anti-spray arc mesh surface 52 serves as an airflow guiding surface. The airflow guiding surface has a curved guide surface to guide the vertical airflow in the second airflow channel 25 toward the outlet 30, preventing the vertical airflow in the second airflow channel 25 from flowing back toward a direction away from the outlet 30.

[0084] The second anti-blowout element 50 also includes a fixing surface 55. The fixing surface 55 is preferably a plane parallel to the channel sidewall, which engages with the channel sidewall to facilitate the fixing of the second anti-blowout element 50. The second anti-blowout element 50 is preferably installed at the intersection of the first and second airflow channels by means of snap-fit ​​or similar methods. Alternatively, the second anti-blowout element 50 can be welded to the circuit breaker housing structure at the fixing surface 55.

[0085] Preferably, the second anti-spray arc element 50 is formed by bending a metal plate-shaped element, thereby the second anti-spray arc element 50 has a simple structure and is easy to process and manufacture.

[0086] like Figure 1 As shown, preferably, the inlet size of the first airflow channel 15 is greater than or equal to the length of the end 132 of the first arc-extinguishing chamber 13, and / or the inlet size of the second airflow channel 25 is greater than or equal to the length of the end 232 of the second arc-extinguishing chamber 23. In other words, the inlet width of the airflow channel can span or exceed the entire end of the arc-extinguishing chamber, so that the gas flowing out of the entire arc-extinguishing chamber can directly enter the corresponding airflow channel. Furthermore, the ultra-wide airflow channel inlet, combined with the strip-shaped guide portion described below, can form a flow channel that has both good flow performance and can utilize a compact space to form a relatively long flow channel.

[0087] Preferably, the circuit breaker has a strip-shaped guide 26 extending between the rear side 232 of the second arc-extinguishing chamber and the second end wall 24 of the circuit breaker housing located at the second end 20. The strip-shaped guide 26 extends generally in the y-direction, i.e., substantially aligned with the height direction of the arc-extinguishing chamber or the height direction of the circuit breaker. Through the strip-shaped guide 26, the second airflow passage 25 forms a bend of approximately 180°, forming a first passage portion 251 defined by the rear side 232 of the second arc-extinguishing chamber and the strip-shaped guide 26, and a second passage portion 252 connected to the first passage portion 251 and defined by the second end wall 24 and the strip-shaped guide 26. The first passage portion 251 extends generally upward in the y-direction, i.e., toward the top of the circuit breaker, and the second passage portion 252 extends generally downward in the y-direction, i.e., toward the bottom of the circuit breaker. Compared to a design without the strip-shaped guide 26, the length of the first airflow passage 15 is significantly increased.

[0088] The second channel portion 252 of the second airflow channel 25 converges with the first airflow channel 15 and flows together toward the outlet 30. Preferably, the outlet 30 includes a first outlet and a second outlet, and the confluence area of ​​the two channels includes a first confluence area and a second confluence area, and after passing through the first confluence area and the second confluence area, the airflow leads to the first outlet and the second outlet respectively.

[0089] Preferably, the outlet is located at the bottom of the circuit breaker. In particular, the outlet can be located below the stationary contact assembly 111. This arrangement allows for a balance in the lengths of the first and second airflow channels.

[0090] Figure 7 A cross-sectional view of a circuit breaker according to a preferred embodiment of the present disclosure is shown, illustrating a second channel portion 252 of the second airflow passage 25. Preferably, the second channel portion 252 includes two second airflow branches 253 separated by the stationary contact assembly 111. Figure 8 Another cross-sectional view of a circuit breaker according to a preferred embodiment of the present disclosure is shown, illustrating the end of the first airflow passage 15. Preferably, the first airflow passage 15 is divided into two first airway branches 151 by a partition structure 16. Preferably, the two second airway branches 253 of the second airflow passage 25 intersect with the two first airway branches 151 of the first airflow passage 15, respectively, forming a first intersection region and a second intersection region. Preferably, a second anti-arc spray element 50 is provided in both the first intersection region and the second intersection region.

[0091] Appendix Figure 7 and 8The illustrated embodiment relates to a double-pole circuit breaker, wherein the components and arrangement of the two poles are substantially the same. The foregoing description is applicable to either pole of the double-pole circuit breaker. In embodiments not shown, the circuit breaker may be a single-pole circuit breaker, a three-pole circuit breaker, etc.

[0092] Preferred options Figure 8 As shown, the partition structure 16 preferably has a guide surface 161 facing upstream of the first airflow channel 15, and two engaging portions 162 located on both sides of the guide surface 161. The engaging portions 162 can engage with the second anti-arc ejection element 50 to facilitate the positioning of the second anti-arc ejection element 50 relative to the circuit breaker housing. Preferably, the circuit breaker housing is also provided with a engaging structure for limiting the position of the second anti-arc ejection element 50.

[0093] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A circuit breaker comprising a first end (10) and a second end (20) opposite to each other, and a component located between the first end (10) and the second end (20): The first set of moving and stationary contacts; The first arc-extinguishing chamber (13) has a front side (131) close to the first set of moving and stationary contacts and a rear side (132) away from the first set of moving and stationary contacts. The second set of moving and stationary contacts; The second arc-extinguishing chamber (23) has a front side (231) close to the second set of moving and stationary contacts and a rear side (232) away from the second set of moving and stationary contacts. in, The circuit breaker also has a first airflow channel (15) starting from the rear side (132) of the first arc-extinguishing chamber and a second airflow channel (25) starting from the rear side (232) of the second arc-extinguishing chamber (23), and the outlets of the first airflow channel (15) and the second airflow channel (25) are both located at the second end (20); Furthermore, a first anti-arc element (40) is provided at the first end (10), and the first anti-arc element (40) is located between the rear side (132) of the first arc extinguishing chamber and the outer surface of the first end wall (14) of the first end (10).

2. The circuit breaker as described in claim 1, characterized in that, A groove is provided in the first end wall (14) of the first end (10), and the first anti-spray arc element (40) is installed in the groove.

3. The circuit breaker as described in claim 1, characterized in that, The first anti-spray arc element (40) is a plate-shaped element with multiple through holes.

4. The circuit breaker as described in claim 3, characterized in that, The first anti-spray arc element (40) is a metal woven mesh or a metal perforated plate.

5. The circuit breaker as claimed in claim 1, characterized in that, The second airflow channel (25) leads to the same outlet (30) as the first airflow channel (15).

6. The circuit breaker as described in claim 5, characterized in that, A second anti-jet arc element (50) is provided in the intersection area of ​​the first airflow channel (15) and the second airflow channel (25).

7. The circuit breaker as claimed in claim 6, characterized in that, The second anti-blowout element (50) includes one or more anti-blowout mesh surfaces, each of which is arranged to be traversed by gas in the first airflow channel (15) and / or the second airflow channel (25).

8. The circuit breaker as claimed in claim 7, characterized in that, At least one of the one or more anti-spray arc mesh surfaces also serves as an airflow guiding surface, the airflow guiding surface having a curved guide surface to guide the gas in the second airflow channel (25) toward the outlet (30).

9. The circuit breaker as claimed in claim 7, characterized in that, The second anti-blowout element (50) also includes a fixing surface (55) that engages with the channel sidewall to facilitate the fixing of the second anti-blowout element (50).

10. The circuit breaker as claimed in claim 6, characterized in that, The second anti-spray arc element (50) is formed by bending a metal plate-shaped element.

11. The circuit breaker as claimed in claim 6, characterized in that, The outlet (30) includes a first outlet and a second outlet, and the intersection area includes a first intersection area and a second intersection area leading to the first outlet and the second outlet respectively. A second anti-spray arc element (50) is provided in both the first intersection area and the second intersection area.

12. The circuit breaker as claimed in claim 1, characterized in that, The outlet is located at the bottom of the circuit breaker.

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