A fast arc-extinguishing device for circuit breakers

Abstract

This utility model provides a rapid arc-extinguishing device for a circuit breaker, including a moving contact, a first arc-extinguishing grid group, a second arc-extinguishing grid group, a third arc-extinguishing grid group, and a gas-generating assembly. The first and second arc-extinguishing grid groups are arranged at intervals relative to each other along a first direction, and the third arc-extinguishing grid group is located on the upper side of the first arc-extinguishing grid group away from the moving contact. The gas-generating assembly includes a first gas-generating element and a second gas-generating element, which are arranged at intervals relative to each other along a second direction and extend along the arc transfer direction. The second direction is parallel to the arc extension direction and perpendicular to the first direction. The first and second gas-generating elements are arranged in parallel, or, along the arc extension direction, at least a portion of the distance between the first and second gas-generating elements gradually decreases along the arc extension direction. This solves the problem of significant safety hazards when the arc breaking energy is low in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of circuit switches, and in particular to a rapid arc extinguishing device for circuit breakers. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current in a normal circuit, and at the same time, close, carry, and interrupt current in an abnormal circuit within a specified time.

[0003] Typically, a circuit breaker includes moving contacts, stationary contacts, and an arc-extinguishing chamber. The moving and stationary contacts are connected to the circuit. When the moving and stationary contacts disconnect, an electric arc is generated. The arc-extinguishing grids installed in the arc-extinguishing chamber cut the generated arc to extinguish it. Circuit breakers generally have multiple grid areas, and the space between each grid area is the arc transfer zone. The arc can transfer to the next grid area in this space. During the transfer process, as the arc is lengthened, more ionization loss and heat dissipation compensation is required, and its resistance gradually increases. Therefore, when the arc reaches a certain length, it may stagnate. This causes the arc to be unable to move towards the outlet due to insufficient energy, and thus cannot reach other grid areas, stagnating at a certain position in the arc transfer zone, resulting in continuous arcing.

[0004] In existing technologies, gas-generating materials can be placed on both sides of the channel to help the electric arc generate a contraction effect and accelerate arc extinction. The gas-generating materials in existing technologies are generally funnel-shaped. This structure allows the gas-generating material to push the arc towards the arc-extinguishing grid under Brownian motion when the breaking energy is large, utilizing the greater pressure near the moving contact. However, when the breaking arc energy is low (where the pressure at the contact is relatively lower), this structure is insufficient to compensate for the ionization loss and heat dissipation required for arc elongation, hindering arc contraction and thus increasing the arc extinction time, posing a significant safety hazard.

[0005] It is evident that existing technologies pose significant safety risks when the arc breaking energy is low. Summary of the Invention

[0006] This invention provides a rapid arc-extinguishing device for circuit breakers, which solves the problem of significant safety hazards when the arc energy is low in the prior art.

[0007] This utility model provides a fast arc extinguishing device for a circuit breaker, including a moving contact, a first arc extinguishing grid group, a second arc extinguishing grid group, a third arc extinguishing grid group, and a gas generating component.

[0008] The first and second arc-extinguishing grid groups are arranged at intervals relative to each other along a first direction, and the third arc-extinguishing grid group is located on the upper side of the first arc-extinguishing grid group away from the moving contact. The gas-generating assembly includes a first gas-generating element and a second gas-generating element, which are arranged at intervals relative to each other along a second direction and extend along the arc transfer direction. The second direction is parallel to the arc extension direction and perpendicular to the first direction.

[0009] The first gas-generating element and the second gas-generating element are arranged in parallel, or, along the arc extension direction, at least a portion of the distance between the first gas-generating element and the second gas-generating element gradually decreases along the arc extension direction.

[0010] This invention can ensure that the gas pressure of the electric arc remains consistent from the moving contact to the third arc-extinguishing grid plate group by using the first and second gas-generating components arranged in parallel. Alternatively, the first and second gas-generating components, which are arranged in a gradually narrowing manner, can narrow the channel at a distance, helping the electric arc to generate a contraction effect. This can prevent the electric arc from stagnating due to insufficient energy when it moves towards the gas outlet and is continuously stretched, effectively avoiding the phenomenon of continuous arcing and significantly improving the arc extinguishing efficiency.

[0011] Optionally, at least a portion of the spacing gradually decreases along the arc extension direction, and the first gas-generating component includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence.

[0012] At least a portion of the first connecting section is located on both sides of the moving contact, the third connecting section is located between the first and third arc-extinguishing grid groups, and the second connecting section is located between the first and third connecting sections. The distance between the first connecting section and the corresponding second gas-generating element is the first distance, and the distance between the second connecting section and the corresponding second gas-generating element is the second distance.

[0013] The first spacing is greater than the width of the moving contact along the second direction, and the second spacing is less than or equal to the first spacing.

[0014] Optionally, the first spacing is L1, the width of the moving contact is Lc, and 1.1≤first spacing L1 / width of moving contact Lc≤1.5.

[0015] Optionally, the first spacing is L1, the second spacing is L2, and 0.5 ≤ second spacing L2 / first spacing L1 ≤ 1.

[0016] Optionally, the fast arc-extinguishing device of the circuit breaker may also include a first magnet and a second magnet.

[0017] When at least a portion of the spacing gradually decreases along the arc extension direction, the first magnet is disposed in the second connecting section of the first gas generating component; when the first gas generating component and the second gas generating component are arranged in parallel, the first magnet is disposed in the first connecting section of the first gas generating component.

[0018] The second magnet is disposed on the second gas generating component and is disposed opposite to the first magnet. The opposing sides of the first magnet and the second magnet have the same magnetism.

[0019] By setting a first magnet and a second magnet, this embodiment of the invention can provide additional thrust for the arc transfer process, thereby further supplementing the energy for the arc movement when the arc breaking energy is low, preventing the arc from stagnating in the arc transfer zone, and thus further avoiding the phenomenon of continuous arc burning and improving the arc extinguishing efficiency and arc extinguishing reliability.

[0020] Optionally, the rapid arc extinguishing device of the circuit breaker may also include a first magnetic plate and a second magnetic plate.

[0021] The first magnetic plate is located on the side of the first magnet closer to the second magnet, and the second magnetic plate is located on the side of the second magnet closer to the first magnet.

[0022] The first and second magnetic plates are used to adjust the effective range of the first and second magnets, so that the additional thrust generated by the magnets can be precisely applied to the arc in the target area to transfer the arc to the third arc-extinguishing grid plate group. This improves the accuracy of the magnets' action, further improves the arc-extinguishing efficiency and reliability, and avoids the risk of arc combustion.

[0023] Optionally, along the arc extension direction, the end of the first magnetic plate extends beyond the end of the first magnet, and the end of the second magnetic plate extends beyond the end of the second magnet.

[0024] Optionally, when at least a portion of the spacing gradually decreases along the arc extension direction, a third magnet and a fourth magnet are also included. The third magnet is disposed in the first connecting section of the first gas-generating element, and the fourth magnet is disposed in the second gas-generating element and is disposed opposite to the third magnet, with the opposing sides of the third magnet and the fourth magnet having the same magnetism.

[0025] Optionally, the circuit breaker's rapid arc extinguishing device may also include a third magnetic plate and a fourth magnetic plate.

[0026] The third magnetic plate is located on the side of the third magnet closest to the fourth magnet, and the fourth magnetic plate is located on the side of the fourth magnet closest to the third magnet.

[0027] Optionally, along the arc extension direction, the end of the third magnetic plate extends beyond the end of the third magnet, and the end of the fourth magnetic plate extends beyond the end of the fourth magnet.

[0028] This utility model embodiment can adjust the air pressure at the moving contact by using a first and second gas generating element that are set in a gradually decreasing manner. By setting multiple magnets and corresponding magnetic plates, the external magnetic field force can be adjusted to push the electric arc toward the gas outlet, which greatly avoids the occurrence of electric arc stagnation and improves the arc extinguishing efficiency and equipment safety of the circuit breaker. Attached Figure Description

[0029] Figure 1a This is a schematic diagram showing the position and structure of the arc-extinguishing grid assembly in the rapid arc-extinguishing device of the circuit breaker in this embodiment of the present invention;

[0030] Figure 1 This is a side view of the fast arc-extinguishing device of the circuit breaker in an embodiment of the present invention. Figure 1 The first gas-generating component and the second gas-generating component are arranged in parallel.

[0031] Figure 2 This is a side view of the fast arc-extinguishing device of the circuit breaker in an embodiment of the present invention. Figure 2 ;

[0032] Figure 3 This is a side view of the fast arc-extinguishing device of the circuit breaker in an embodiment of the present invention. Figure 3 ;

[0033] Figure 4 This is a side view of the fast arc extinguishing device of the circuit breaker in an embodiment of the present utility model, wherein the first magnet is disposed in the first connecting section of the first gas generating component;

[0034] Figure 5 and Figure 6 This is a side view of the fast arc extinguishing device of the circuit breaker in an embodiment of the present utility model, wherein the first magnet is disposed in the second connecting section of the first gas generating component;

[0035] Figure 7 This is a side view of the fast arc extinguishing device of the circuit breaker in this embodiment of the present utility model. The first gas generating element and the second gas generating element are arranged in parallel and the first magnet is located in the first connecting section. The first magnetic plate is located on the side wall of the first magnet.

[0036] Figure 8 This is a side view of the fast arc extinguishing device of the circuit breaker in this embodiment of the present utility model. The distance between the first gas generating element and the second gas generating element is not equal, and the first magnet is disposed in the second connecting section, and the first magnetic plate is disposed on the side wall of the first magnet.

[0037] Figure 9 This is a side view of the rapid arc extinguishing device of the circuit breaker in an embodiment of the present invention. The spacing is not equal. The first connecting section is provided with a third magnet and a third magnetic plate, and the second connecting section is provided with a first magnet and a first magnetic plate.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1: The circuit breaker's rapid arc-extinguishing device;

[0040] 10: Moving contact; 11: First arc-extinguishing grid group; 12: Second arc-extinguishing grid group; 13: Third arc-extinguishing grid group;

[0041] 14: First gas-generating component; 141: First connecting section; 142: Second connecting section; 143: Third connecting section;

[0042] 15: Second gas-producing component;

[0043] 161: First magnet; 162: Second magnet; 163: Third magnet; 164: Fourth magnet; 171: First magnetic plate; 172: Second magnetic plate; 173: Third magnetic plate; 174: Fourth magnetic plate;

[0044] L1: First spacing; L2: Second spacing; L3: Third spacing; Lc: Width of the moving contact;

[0045] S1: First direction; S2: Second direction. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0047] It should be noted that in this specification, 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.

[0048] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0049] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0050] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

[0051] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0052] This utility model provides a fast arc-extinguishing device 1 for a circuit breaker. Please refer to [link / reference]. Figure 1a and Figure 1 , Figure 1 This can be understood as... Figure 1 The view after rotating 90° along the Y-axis includes the moving contact (not shown in the figure), the first arc-extinguishing grid plate group 11, the second arc-extinguishing grid plate group 12, the third arc-extinguishing grid plate group 13, and the gas generation assembly (including the first gas generation element 14 and the second gas generation element 15).

[0053] The first arc-extinguishing grid group 11 and the second arc-extinguishing grid group 12 are arranged at intervals relative to each other along the first direction S1, and the third arc-extinguishing grid group 13 is located on the upper side of the first arc-extinguishing grid group 11 away from the moving contact 10. The gas generating assembly includes a first gas generating element 14 and a second gas generating element 15, which are arranged at intervals relative to each other along the second direction S2 and extend along the arc transfer direction. The second direction S2 is parallel to the arc extension direction and perpendicular to the first direction S1. Alternatively, it can be understood that... Figure 1 The direction perpendicular to the paper, i.e., the second direction S2, is the direction of arc transfer. Figure 1 The vertical axis direction in the field of view.

[0054] Among them, such as Figure 1 As shown, the first gas-generating component 14 and the second gas-generating component 15 are arranged in parallel, or, as... Figure 2 As shown, at least a portion of the distance between the first gas-generating element 14 and the second gas-generating element 15 gradually decreases along the arc extension direction.

[0055] Those skilled in the art will understand that both the first gas-generating element 14 and the second gas-generating element 15 are arc-extinguishing gas-generating materials, which can react rapidly and generate a large amount of gas when an electric arc occurs, thereby achieving the goal of extinguishing the electric arc. Specifically, they may be, for example, polymer composite materials, ceramic materials, etc.

[0056] This invention can ensure that the gas pressure of the electric arc remains consistent from the moving contact 10 to the third arc-extinguishing grid group 13 by using the parallel arrangement of the first gas generating element 14 and the second gas generating element 15. Alternatively, by using the gradually converging arrangement of the first gas generating element 14 and the second gas generating element 15 to narrow the distant channel, it can help the electric arc generate a contraction effect. This can prevent the electric arc from stagnating due to insufficient energy when it moves towards the gas outlet and is continuously stretched, effectively avoiding the phenomenon of continuous arcing and significantly improving the arc extinguishing efficiency.

[0057] In one implementation, such as Figure 2As shown, the first gas generating component 14 includes a first connecting section 141, a second connecting section 142, and a third connecting section 143 connected in sequence. At least a portion of the first connecting section 141 is located on both sides of the moving contact 10, the third connecting section 143 is located between the first arc-extinguishing grid group 11 and the third arc-extinguishing grid group 13, and the second connecting section 142 is located between the first connecting section 141 and the third connecting section 143.

[0058] For details, please refer to Figure 1a Understand that the area containing the first arc-extinguishing grid group 11 and the second arc-extinguishing grid group 12 is the area within the red frame, and the area containing the third arc-extinguishing grid group 13 is the area within the blue frame. The area between the first arc-extinguishing grid group 11 and the third arc-extinguishing grid group 13 is the arc transfer zone. Figure 1a The area within the green frame. The aforementioned second connecting segment 142 can be understood as being located in the area where the first arc-extinguishing grid group 11 and the second arc-extinguishing grid group 12 are located, and the third connecting segment 143 can be understood as being located in the arc transfer area (i.e., the area within the green frame).

[0059] like Figure 2 As shown, the distance between the first connecting segment 141 and the corresponding second gas generating element 15 is the first distance L1, the distance between the second connecting segment 142 and the corresponding second gas generating element 15 is the second distance L2, and the distance between the third connecting segment 143 and the corresponding second gas generating element 15 is the third distance L3. In one embodiment, as... Figure 2 As shown, the first spacing L1 is greater than the width Lc of the moving contact along the second direction S2, and the second spacing L2 is less than or equal to the first spacing L1. In a specific embodiment, the third spacing L3 can be smaller than the second spacing L2, such as... Figure 2 As shown, the third spacing L3 can also be greater than the second spacing L2, such as... Figure 3 As shown.

[0060] In one specific implementation, for example, 1.1 ≤ first spacing L1 / width Lc of moving contact ≤ 1.5. In another example, 0.5 ≤ second spacing L2 / first spacing L1 ≤ 1.

[0061] For further implementation methods, please refer to Figures 4-6 The circuit breaker's fast arc extinguishing device 1 also includes a first magnet 161 and a second magnet 162.

[0062] When the first gas-generating element 14 and the second gas-generating element 15 are arranged in parallel, such as Figure 4 As shown, the first magnet 161 is disposed on the first connecting section 141 of the first gas generating member 14. When at least a portion of the spacing gradually decreases along the arc extension direction, as... Figure 5 and Figure 6 As shown, the first magnet 161 is disposed on the second connecting section 142 of the first gas generating component 14. Wherein, Figure 5The third spacing L3 is smaller than the second spacing L2. Figure 6 The third spacing L3 is greater than the second spacing L2. The second magnet 162 is disposed on the second gas-generating element 15 and is positioned opposite to the first magnet 161. The opposing sides of the first magnet 161 and the second magnet 162 have the same magnetism. Specifically, the opposing sides of the first magnet 161 and the second magnet 162 can both have N poles or both have S poles.

[0063] By providing a first magnet 161 and a second magnet 162, this embodiment of the invention can provide additional thrust for the arc transfer process, thereby further supplementing the arc movement with energy when the arc breaking energy is low, preventing the arc from stalling in the arc transfer zone, and thus further avoiding the phenomenon of continuous arc burning and improving the arc extinguishing efficiency and arc extinguishing reliability.

[0064] In a further implementation, such as Figure 7 and Figure 8 As shown, the fast arc extinguishing device 1 of the circuit breaker also includes a first magnetic plate 171 and a second magnetic plate 172. The first magnetic plate 171 is disposed on the side of the first magnet 161 near the second magnet 162, and the second magnetic plate 172 is disposed on the side of the second magnet 162 near the first magnet 161.

[0065] Using the above scheme, the first magnetic plate 171 and the second magnetic plate 172 are used to adjust the effective range of the first magnet 161 and the second magnet 162, so that the additional thrust generated by the magnets is precisely applied to the arc in the target area, so as to transfer the arc to the third arc extinguishing grid plate group 13, thereby improving the accuracy of the magnet's action, further improving the arc extinguishing efficiency and arc extinguishing reliability, and avoiding the risk of arc combustion.

[0066] This utility model does not limit the installation position, shape and size of the magnetic plate. Those skilled in the art can set it as needed according to the actual situation. In one embodiment, along the arc extension direction, the end of the first magnetic plate 171 extends beyond the end of the first magnet 161, and the end of the second magnetic plate 172 extends beyond the end of the second magnet 162.

[0067] In a further implementation, such as Figure 9As shown, when at least a portion of the spacing gradually decreases along the arc extension direction, it also includes a third magnet 163 and a fourth magnet 164. The third magnet 163 is disposed on the first connecting section 141 of the first gas generating member 14, and the fourth magnet 164 is disposed on the second gas generating member 15 and is disposed opposite to the third magnet 163. The opposing sides of the third magnet 163 and the fourth magnet 164 have the same magnetism. Further, it also includes a third magnetic guide plate 173 and a fourth magnetic guide plate 174. The third magnetic guide plate 173 is disposed on the side of the third magnet 163 near the fourth magnet 164, and the fourth magnetic guide plate 174 is disposed on the side of the fourth magnet 164 near the third magnet 163. In a specific embodiment, along the arc extension direction, the end of the third magnetic guide plate 173 extends beyond the end of the third magnet 163, and the end of the fourth magnetic guide plate 174 extends beyond the end of the fourth magnet 164.

[0068] This utility model embodiment can adjust the air pressure at the moving contact 10 by using the first gas generating element 14 and the second gas generating element 15 with a gradually decreasing configuration. By setting multiple magnets and corresponding magnetic plates, the external magnetic field force can be adjusted to push the electric arc towards the gas outlet, which greatly avoids the occurrence of electric arc stagnation and improves the arc extinguishing efficiency and equipment safety of the circuit breaker.

[0069] Those skilled in the art will understand that this embodiment uses three arc-extinguishing grid groups to form two arc-extinguishing grid regions. If other embodiments have more arc-extinguishing grid groups to form more arc-extinguishing grid regions, a similar method can be used to drive the arc.

[0070] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A fast arc quenching device for a circuit breaker, characterized by It includes a moving contact, a first arc-extinguishing grid group, a second arc-extinguishing grid group, a third arc-extinguishing grid group, and a gas-generating assembly; The first arc-extinguishing grid plate group and the second arc-extinguishing grid plate group are arranged at intervals relative to each other along a first direction, and the third arc-extinguishing grid plate group is located on the upper side of the first arc-extinguishing grid plate group away from the moving contact; the gas generating assembly includes a first gas generating element and a second gas generating element, the first gas generating element and the second gas generating element are arranged at intervals relative to each other along a second direction and extend along the arc transfer direction; The second direction is parallel to the extension direction of the electric arc and perpendicular to the first direction; The first gas generating element and the second gas generating element are arranged in parallel, or at least a portion of the distance between the first gas generating element and the second gas generating element gradually decreases along the arc extension direction.

2. The rapid arc-extinguishing device for a circuit breaker according to claim 1, characterized in that, At least a portion of the spacing gradually decreases along the arc extension direction, and the first gas generating component includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. At least a portion of the first connecting segment is located on both sides of the moving contact, the third connecting segment is located between the first arc-extinguishing grid group and the third arc-extinguishing grid group, and the second connecting segment is located between the first connecting segment and the second connecting segment; the distance between the first connecting segment and the corresponding second gas generating element is a first distance, and the distance between the second connecting segment and the corresponding second gas generating element is a second distance; The first spacing is greater than the width of the moving contact along the second direction, and the second spacing is less than or equal to the first spacing.

3. The rapid arc-extinguishing device for a circuit breaker according to claim 2, characterized in that, The first spacing is L1, the width of the moving contact is Lc, and 1.1 ≤ first spacing L1 / width of the moving contact Lc ≤ 1.

5.

4. The rapid arc-extinguishing device for a circuit breaker according to claim 2, characterized in that, The first spacing is L1, the second spacing is L2, and 0.5 ≤ the second spacing L2 / the first spacing L1 ≤ 1.

5. The rapid arc-extinguishing device for a circuit breaker according to claim 2, characterized in that, It also includes a first magnet and a second magnet; When at least a portion of the spacing gradually decreases along the arc extension direction, the first magnet is disposed in the second connecting section of the first gas generating component; when the first gas generating component and the second gas generating component are arranged in parallel, the first magnet is disposed in the first connecting section of the first gas generating component. The second magnet is disposed on the second gas generating component and is disposed opposite to the first magnet. The opposing sides of the first magnet and the second magnet have the same magnetism.

6. The rapid arc-extinguishing device for a circuit breaker according to claim 5, characterized in that, It also includes a first magnetic plate and a second magnetic plate; The first magnetic plate is disposed on the side of the first magnet closer to the second magnet, and the second magnetic plate is disposed on the side of the second magnet closer to the first magnet.

7. The rapid arc-extinguishing device for a circuit breaker according to claim 6, characterized in that, Along the direction of arc extension, the end of the first magnetic plate extends beyond the end of the first magnet, and the end of the second magnetic plate extends beyond the end of the second magnet.

8. The rapid arc-extinguishing device for a circuit breaker according to claim 5, characterized in that, When at least a portion of the spacing gradually decreases along the arc extension direction, it also includes a third magnet and a fourth magnet; the third magnet is disposed in the first connecting section of the first gas generating element, and the fourth magnet is disposed in the second gas generating element and is disposed opposite to the third magnet, and the magnetic properties of the third magnet and the fourth magnet are the same on the opposite sides.

9. The rapid arc-extinguishing device for a circuit breaker according to claim 8, characterized in that, It also includes a third magnetic plate and a fourth magnetic plate; The third magnetic plate is disposed on the side of the third magnet close to the fourth magnet, and the fourth magnetic plate is disposed on the side of the fourth magnet close to the third magnet.

10. The rapid arc-extinguishing device for a circuit breaker according to claim 9, characterized in that, Along the arc extension direction, the end of the third magnetic plate extends beyond the end of the third magnet, and the end of the fourth magnetic plate extends beyond the end of the fourth magnet.

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