An arc quenching system

Abstract

The utility model provides a kind of arc extinguishing system, it is related to electrical equipment technical field.Arc extinguishing system, including shell and being arranged in the contact assembly of shell, arc chamber and arc plate.The contact assembly includes the moving contact and static contact of being arranged in shell, and the area between moving contact and static contact forms contact opening in the area of opening state;Arc chamber has arc entry end and arc exit end, arc plate is arranged in one side of arc chamber, by the intersection of arc plate and the plane of arc entry end of arc chamber is opposite with contact opening to set, to this enhances arc extinguishing effect and arc extinguishing efficiency, also improve the stability and reliability of arc extinguishing system, thus help to realize quick, stable breaking operation, and therefore improve the breaking capacity and electrical safety of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to an arc extinguishing system. Background Technology

[0002] Circuit breakers, as key equipment in power systems for connecting and disconnecting circuits, directly affect the safe operation of electrical systems. Among them, the arc-extinguishing chamber, a core component of the circuit breaker, is mainly used to quickly extinguish the electric arc generated during contact breaking, preventing damage to the contacts and surrounding structures, and ensuring the stability and service life of the equipment.

[0003] However, the existing arc extinguishing chambers have a simple internal structure and poor arc guiding path, which makes it impossible to effectively guide and control the arc movement. This can easily lead to arc retention, spread, or even reignition, thus not only reducing the breaking capacity of the circuit breaker but also potentially causing safety accidents and affecting the normal operation of the power system. Utility Model Content

[0004] The purpose of this invention is to provide an arc extinguishing system that enhances the arc extinguishing effect and efficiency, as well as improves the stability and reliability of the arc extinguishing system. This helps to achieve fast and stable disconnection operations, thereby improving the breaking capacity and electrical safety of the circuit breaker.

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

[0006] In a first aspect, this utility model provides an arc extinguishing system, comprising:

[0007] case;

[0008] A contact assembly, comprising a moving contact and a stationary contact disposed in the housing, wherein a contact opening is formed between the moving contact and the stationary contact in the open state;

[0009] An arc-extinguishing chamber is disposed in the shell and has an arc-entry end and an arc-exit end;

[0010] An arc-initiating plate is disposed on one side of the arc-extinguishing chamber, and the intersection of the arc-initiating plate and the plane containing the arc-entry end of the arc-extinguishing chamber is directly opposite the contact opening.

[0011] In an optional embodiment, the side of the arc-starting plate away from the arc-extinguishing chamber forms a cavity with the housing.

[0012] In an optional embodiment, the arc-initiating plate includes a first segment and a second segment connected to each other. One end of the first segment is connected to the second segment, and the other end is used to extend toward the moving contact. The intersection of the first segment and the plane where the arc-inlet end of the arc-extinguishing chamber is located is directly opposite the contact opening. The second segment is located on one side of the arc-extinguishing chamber and is arranged parallel to the grid plate of the arc-extinguishing chamber. The sides of the first segment and the second segment away from the arc-extinguishing chamber form a cavity with the housing.

[0013] In an optional embodiment, the arc-entry end and the arc-exit end extend along a first direction, and the direction of the contact opening extends along a second direction. The first direction and the second direction are set at a first angle, which is 15°~75°.

[0014] In an optional embodiment, the stationary contact includes a stationary contact plate and a bending plate connected together, the bending plate extending along the second direction, and the bending plate and the moving contact forming a contact opening extending along the second direction.

[0015] In an optional embodiment, the arc extinguishing system further includes a secondary arc-starting plate and a terminal block, wherein the secondary arc-starting plate is disposed on the side of the arc extinguishing chamber away from the arc-starting plate;

[0016] The stationary contact further includes a lap plate connected to the bending plate, and the portion of the secondary arc-initiating plate extending out of the arc-extinguishing chamber is connected to the lap plate; or, the stationary contact further includes a lead-out plate connected to the stationary contact plate, the lead-out plate being connected to the terminal block, and the portion of the secondary arc-initiating plate extending out of the arc-extinguishing chamber being connected to the lead-out plate.

[0017] In an optional embodiment, the arc extinguishing system further includes at least one arc-splitting baffle, which is disposed at the arc-exiting end of the arc extinguishing chamber.

[0018] In an optional embodiment, the arc extinguishing system further includes an arc-initiating baffle connected to the arc-splitting baffle. An airflow channel is formed between two adjacent arc-initiating baffles or between the arc-initiating baffle and the housing. The extension direction of the airflow channel is set at a second angle with the extension directions of the arc-inlet end and the arc-outlet end, and the second angle is 15°~75°.

[0019] In an optional embodiment, the arc extinguishing system further includes an arc-initiating baffle, which is connected at an angle to the end of the arc-initiating partition away from the arc-splitting partition. The housing is provided with an air outlet, and the arc-initiating baffle is correspondingly provided with the air outlet.

[0020] In an optional embodiment, the arc extinguishing system further includes a handle disposed on the housing, the contact assembly being located on the left or right side of the handle, and the arc extinguishing chamber being located below the contact assembly.

[0021] The beneficial effects of the arc-extinguishing system provided by this utility model embodiment include: by setting the intersection of the arc-initiating plate and the plane where the arc-entry end of the arc-extinguishing chamber is located directly opposite the contact opening, part of the electric arc and airflow generated during the opening process of the moving and stationary contacts directly enters the arc-extinguishing chamber, while the other part is reflected by the arc-initiating plate and then enters the arc-extinguishing chamber. On the one hand, the arc-initiating plate can guide and accelerate the electric arc, allowing it to leave the contact opening area more quickly, reducing the risk of contact burn-out and extending its service life. On the other hand, through the reflection effect of the arc-initiating plate, not only can the electric arc energy be reduced, but the electric arc that might have escaped to other areas can also be reintroduced into the arc-extinguishing chamber, thus improving the arc capture rate and arc extinguishing success rate, and avoiding equipment damage or safety accidents caused by arc leakage. Therefore, the arc-extinguishing system provided by this utility model embodiment not only effectively enhances the arc extinguishing effect and efficiency, but also improves the stability and reliability of the arc-extinguishing system, thus helping to achieve fast and stable disconnection operations, and thereby improving the breaking capacity and electrical safety of the circuit breaker. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the arc extinguishing system structure provided in an embodiment of the present utility model;

[0024] Figure 2 This is a partially enlarged structural schematic diagram of the arc extinguishing system provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the arc-extinguishing chamber structure provided in an embodiment of the present utility model;

[0026] Figure 4 This is a partially enlarged structural schematic diagram of another embodiment of the arc extinguishing system provided by this utility model.

[0027] Icons: 10-Arc extinguishing system; 100-Housing; 110-Air outlet; 200-Contact assembly; 210-Moving contact; 220-Stationary contact; 221-Stationary contact plate; 222-Bending plate; 223-Overlap plate; 224-Lead-out plate; 230-Contact opening; 300-Arc extinguishing chamber; 310-Arc inlet end; 320-Arc outlet end; 400-Arc ignition plate; 410-First section; 420-Second section; 500-Cavity; 600-Arc splitting partition; 700-Arc ignition partition; 710-Airflow channel; 800-Arc ignition baffle; 900-Handle; 1000-Secondary arc ignition plate; 1100-Terminal. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Circuit breakers, as key equipment in power systems for connecting and disconnecting circuits, directly affect the safe operation of electrical systems. Among them, the arc-extinguishing chamber, a core component of the circuit breaker, is mainly used to quickly extinguish the electric arc generated during contact breaking, preventing damage to the contacts and surrounding structures, and ensuring the stability and service life of the equipment.

[0035] However, the existing arc extinguishing chambers have a simple internal structure and poor arc guiding path, which makes it impossible to effectively guide and control the arc movement. This can easily lead to arc retention, spread, or even reignition, thus not only reducing the breaking capacity of the circuit breaker but also potentially causing safety accidents and affecting the normal operation of the power system.

[0036] Therefore, there is an urgent need to provide an arc-extinguishing chamber solution with optimized structure and excellent arc-extinguishing performance to solve the problem of poor arc-extinguishing effect in the existing technology, improve the overall performance and safety of circuit breakers, and meet the application requirements of modern power equipment for high reliability and high breaking capacity.

[0037] Please see Figures 1 to 3 This utility model provides an arc extinguishing system 10, which is applied to a circuit breaker. The arc extinguishing system 10 includes a housing 100 and a contact assembly 200, an arc extinguishing chamber 300 and an arc-starting plate 400 disposed on the housing 100.

[0038] The contact assembly 200 includes a moving contact 210 and a stationary contact 220 disposed in the housing 100. In the open state, the area between the moving contact 210 and the stationary contact 220 forms a contact opening 230. The arc-extinguishing chamber 300 has an arc-entry end 310 and an arc-exit end 320, and an arc-initiating plate 400 is disposed on one side of the arc-extinguishing chamber 300.

[0039] In this embodiment, the intersection of the planes where the arc-starting plate 400 and the arc-extinguishing chamber 300 are located (the arc-starting end 310) is located is used. Figure 1The arc ignition plate (as indicated by A) is positioned directly opposite the contact opening 230 so that a portion of the arc and airflow generated during the opening process of the moving contact 210 and the stationary contact 220 directly enters the arc-extinguishing chamber 300, while the other portion is reflected by the arc-initiating plate 400 and then enters the arc-extinguishing chamber 300. On the one hand, the arc-initiating plate 400 can guide and accelerate the arc, allowing it to leave the area where the contact opening 230 is located more quickly, reducing the risk of contact burn-out and extending service life. On the other hand, through the reflective effect of the arc-initiating plate 400, not only can the arc energy be reduced, but the arc that might otherwise dissipate to other areas can also be reintroduced into the arc-extinguishing chamber 300, thus improving the arc capture rate and arc extinguishing success rate, and preventing arc leakage from causing equipment damage or safety accidents.

[0040] Therefore, the arc extinguishing system 10 provided by this utility model embodiment not only effectively enhances the arc extinguishing effect and efficiency, but also improves the stability and reliability of the arc extinguishing system 10, thus helping to achieve fast and stable disconnection operation, and thereby improving the circuit breaker's breaking capacity and electrical safety.

[0041] Furthermore, the side of the arc-starting plate 400 away from the arc-extinguishing chamber 300 forms a cavity 500 with the shell 100. Therefore, during the process of the electric arc and airflow moving towards the arc-starting plate 400, some of the airflow first enters the cavity 500, thereby effectively reducing the air pressure of the electric arc moving towards the arc-starting plate 400, thus facilitating the faster movement of the electric arc, thereby increasing the speed at which the electric arc enters the arc-extinguishing chamber 300, and thus improving the arc-extinguishing efficiency.

[0042] Specifically, the arc-inducing plate 400 includes a first segment 410 and a second segment 420 connected to each other. One end of the first segment 410 is connected to the second segment 420, and the other end is used to extend toward the moving contact 210.

[0043] The first segment 410 is positioned opposite the contact opening 230 at the intersection of the plane where it intersects with the arc-entry end 310 of the arc-extinguishing chamber 300. This allows part of the arc and airflow to directly enter the arc-extinguishing chamber 300, while the other part is bounced off the first segment 410 and enters the arc-extinguishing chamber 300, thus guiding and accelerating the arc. The second segment 420 is positioned on one side of the arc-extinguishing chamber 300 and parallel to the grid of the arc-extinguishing chamber 300, so as to guide the arc in the direction toward the arc-extinguishing chamber 300. The side of the first segment 410 and the second segment 420 away from the arc-extinguishing chamber 300 forms a cavity 500 with the housing 100, further enhancing the effect of increasing the arc's movement speed.

[0044] Furthermore, the arc-extinguishing chamber 300 is inclined relative to the shell 100. Specifically, the arc-entry end 310 and the arc-exit end 320 are inclined along a first direction (e.g., Figure 2 (As shown by arrow C) extends, with the contact opening 230 in the direction (as shown by arrow C). Figure 2(As shown by arrow B) extends along the second direction, with the first direction forming a first angle with the second direction (as shown by arrow B). Figure 2 (As shown in angle a)

[0045] It is worth noting that the extension directions of the arc inlet end 310 and the arc outlet end 320, which are the extension directions of the multiple grid plates in the arc extinguishing chamber 300, are also the flow directions of the high-temperature and high-pressure gas formed during the arc extinguishing process within the arc extinguishing chamber 300.

[0046] Therefore, by setting an inclined arc-extinguishing chamber 300 to accommodate shells 100 of different specifications and irregular shapes, the installation adaptability of the arc-extinguishing chamber 300 is improved, and a larger arc-extinguishing chamber 300 can be installed within the limited space of the shell 100, thereby ensuring the arc-extinguishing effect.

[0047] Specifically, the first included angle is 15°~75°, so that the angle between the extension direction of the arc-entry end 310 and the arc-exit end 320 and the direction of the contact opening 230 is within a reasonable range, avoiding the arc extinguishing effect from being too large or too small.

[0048] Optionally, the first included angle can be 15°, 30°, 45°, 60°, 75°, etc. Of course, in other embodiments of this utility model, the first included angle can also be other angles within the range of 15° to 75°, which are not specifically limited here.

[0049] It should be noted that the stationary contact 220 includes a stationary contact plate 221 and a bending plate 222 connected to each other. The stationary contact plate 221 is provided with a stationary contact portion for contacting the moving contact 210. The bending plate 222 extends in the second direction, and the bending plate 222 and the moving contact 210 form a contact opening 230 extending in the second direction.

[0050] It can be understood that the direction of the contact opening 230 is the direction of the electric arc and airflow generated during the separation of the moving contact 210 and the stationary contact 220; therefore, in this embodiment, a bending plate 222 is provided on the stationary contact 220 to guide the electric arc to move along its extension direction, so that the electric arc and airflow can move in the contact opening 230 along the extension direction of the bending plate 222.

[0051] It should also be noted that the stationary contact 220 includes a lap plate 223 connected to the bending plate 222, and the arc extinguishing system 10 includes a secondary arc-starting plate 1000. The secondary arc-starting plate 1000 is located on the side of the arc extinguishing chamber 300 away from the arc-starting plate 400, and the part of the secondary arc-starting plate 1000 extending out of the arc extinguishing chamber 300 is connected to the lap plate 223, thereby ensuring that the arc is guided along the arc extinguishing chamber 300 between the arc-starting plate 400 and the secondary arc-starting plate 1000.

[0052] In other embodiments of this utility model, such as Figure 4As shown, the arc extinguishing system 10 also includes a terminal block 1100, which is disposed in the housing 100. The stationary contact 220 also includes a lead-out plate 224. The terminal block 1100, the lead-out plate 224, the stationary contact plate 221, the bending plate 222, and the overlapping plate 223 are connected in sequence. The part of the secondary arc-inducing plate 1000 extending out of the arc extinguishing chamber 300 is connected to the lead-out plate 224.

[0053] Furthermore, the arc extinguishing system 10 also includes at least one arc-splitting baffle 600, which is disposed at the arc-exiting end 320 of the arc extinguishing chamber 300.

[0054] By setting at least one arc-splitting baffle 600 at the arc-out end 320 of the arc-extinguishing chamber 300, the electric arc or gas flowing out of the arc-extinguishing chamber 300 is separated into multiple airflows, thereby balancing the gas pressure in different parts of the arc-extinguishing chamber 300, so that the electric arc can quickly enter the arc-extinguishing chamber 300, thus achieving the effect of rapid arc extinguishing.

[0055] Furthermore, the arc extinguishing system 10 also includes an arc-initiating baffle 700, which is connected to the arc-splitting baffle 600. An airflow channel 710 is formed between two adjacent arc-initiating baffles 700 or between the arc-initiating baffle 700 and the housing 100. The extension direction of the airflow channel 710 is (e.g., Figure 2 (As shown by arrow D) forms a second angle with the extension directions of the inlet end 310 and the outlet end 320 (as shown by arrow D). Figure 2 (Settings shown in angle b).

[0056] In this embodiment, the extension direction of the flow channel is the extension direction of the arc-initiating baffle 700. By setting the arc-initiating baffle 700 connected to the arc-splitting baffle 600, the arc and airflow flow along the airflow channel 710 under the guidance of the arc-initiating baffle 700, avoiding the airflow being bounced back to the arc-extinguishing chamber 300, thus preventing the arc from moving in the opposite direction to the contact and breaking down and reigniting.

[0057] Specifically, the second included angle is 15°~75°, so that the included angle between the extension direction of the airflow channel 710 and the extension directions of the arc entry end 310 and the arc exit end 320 is within a reasonable range, so as to avoid the arc extinguishing effect being affected by the angle being too large or too small.

[0058] Optionally, the second included angle can be 15°, 30°, 45°, 60°, 75°, etc. Of course, in other embodiments of this utility model, the second included angle can also be other angles within the range of 15° to 75°, which are not specifically limited here.

[0059] Furthermore, the arc extinguishing system 10 also includes an arc-initiating baffle 800, which is connected to the end of the arc-initiating partition 700 away from the arc-splitting partition 600. The housing 100 is provided with an air outlet 110, and the arc-initiating baffle 800 is located between the air outlet 110 and the outlet of the airflow channel 710.

[0060] In this embodiment, the airflow channel 710 is oriented toward the air outlet 110. By setting an arc-inducing baffle 800 at the end of the arc-inducing baffle 700 and making it corresponding to the air outlet 110, the airflow direction is not directly aligned with the air outlet 110, thereby preventing metal particles in the airflow from being discharged from the exhaust port to the outside of the housing 100, so as to avoid damaging other electrical components or even causing an open flame accident.

[0061] It is worth noting that the arc-splitting baffle 600, the arc-initiating baffle 700, and the arc-initiating baffle 800 can be separate components, or they can be manufactured using an integral molding process, or they can be integrally molded with the housing 100. No specific limitations are made here.

[0062] Furthermore, the arc extinguishing system 10 also includes a handle 900 disposed on the housing 100, a contact assembly 200 located on the left or right side of the handle 900, and an arc extinguishing chamber 300 located on the lower side of the contact assembly 200.

[0063] In this embodiment, with reference to the illustration, the contact assembly 200 is located on the right side of the handle 900, and the arc-extinguishing chamber 300 is located on the lower side of the contact assembly 200. With this arrangement, the contact assembly 200 and the arc-extinguishing chamber 300 occupy only a small space in the housing 100, making the structure more compact, and thus freeing up more space for placing circuit boards and other electrical components.

[0064] In summary, this utility model provides an arc-extinguishing system 10. By aligning the intersection of the plane containing the arc-initiating plate 400 and the arc-entry end 310 of the arc-extinguishing chamber 300 with the contact opening 230, a portion of the arc and airflow generated during the opening process of the moving contact 210 and the stationary contact 220 directly enters the arc-extinguishing chamber 300, while the other portion is rebounded by the arc-initiating plate 400 and then enters the arc-extinguishing chamber 300. On the one hand, the arc-initiating plate 400 can guide and accelerate the arc, allowing it to leave the area of ​​the contact opening 230 more quickly, reducing the risk of contact burn-out and prolonging the circuit. On the one hand, the arc extinguishing system has a longer service life; on the other hand, through the reflection effect of the arc ignition plate 400, not only can the arc energy be reduced, but the arc that might have escaped to other areas can also be reintroduced into the arc extinguishing chamber 300, thereby improving the arc capture rate and arc extinguishing success rate, and avoiding arc leakage that could cause equipment damage or safety accidents. It can be seen that the arc extinguishing system 10 provided by this utility model embodiment not only effectively enhances the arc extinguishing effect and arc extinguishing efficiency, but also improves the stability and reliability of the arc extinguishing system 10, thus helping to achieve fast and stable disconnection operation, and thereby improving the circuit breaker's breaking capacity and electrical safety.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An arc extinguishing system, characterized in that, include: Casing (100); The contact assembly (200) includes a moving contact (210) and a stationary contact (220) disposed in the housing (100), wherein a contact opening (230) is formed between the moving contact (210) and the stationary contact (220) in the open state. An arc-extinguishing chamber (300) is disposed in the housing (100) and has an arc-entry end (310) and an arc-exit end (320). An arc-initiating plate (400) is disposed on one side of the arc-extinguishing chamber (300), and the intersection of the plane where the arc-initiating plate (400) and the arc-entry end (310) of the arc-extinguishing chamber (300) are located is directly opposite to the contact opening (230).

2. The arc-extinguishing system according to claim 1, characterized in that, The side of the arc-starting plate (400) away from the arc-extinguishing chamber (300) forms a cavity (500) with the shell (100).

3. The arc-extinguishing system according to claim 2, characterized in that, The arc-initiating plate (400) includes a first segment (410) and a second segment (420) connected to each other. One end of the first segment (410) is connected to the second segment (420), and the other end is used to extend toward the moving contact (210). The intersection of the plane where the first segment (410) and the arc-inlet end (310) of the arc-extinguishing chamber (300) are located is directly opposite to the contact opening (230). The second segment (420) is located on one side of the arc-extinguishing chamber (300) and is parallel to the grid of the arc-extinguishing chamber (300). The side of the first segment (410) and the second segment (420) away from the arc-extinguishing chamber (300) forms a cavity (500) with the housing (100).

4. The arc-extinguishing system according to claim 1, characterized in that, The arc-entry end (310) and the arc-exit end (320) extend along a first direction, and the direction of the contact opening (230) extends along a second direction. The first direction and the second direction are set at a first angle, which is 15°~75°.

5. The arc-extinguishing system according to claim 4, characterized in that, The stationary contact (220) includes a stationary contact plate (221) and a bent plate (222) connected to each other. The bent plate (222) extends along the second direction, and the bent plate (222) and the moving contact (210) form a contact opening (230) extending along the second direction.

6. The arc-extinguishing system according to claim 5, characterized in that, The arc extinguishing system (10) further includes a secondary arc-starting plate (1000) and a terminal block (1100), wherein the secondary arc-starting plate (1000) is disposed on the side of the arc extinguishing chamber (300) away from the arc-starting plate (400); The stationary contact (220) further includes a lap plate (223) connected to the bending plate (222), and the portion of the secondary arc-starting plate (1000) extending out of the arc-extinguishing chamber (300) is connected to the lap plate (223); or, the stationary contact (220) further includes a lead-out plate (224) connected to the stationary contact plate (221), the lead-out plate (224) is connected to the terminal block (1100), and the portion of the secondary arc-starting plate (1000) extending out of the arc-extinguishing chamber (300) is connected to the lead-out plate (224).

7. The arc-extinguishing system according to claim 1, characterized in that, The arc extinguishing system further includes at least one arc-splitting baffle (600), which is disposed at the arc-exiting end (320) of the arc-extinguishing chamber (300).

8. The arc-extinguishing system according to claim 7, characterized in that, The arc extinguishing system further includes an arc-initiating baffle (700), which is connected to the arc-splitting baffle (600). An airflow channel (710) is formed between two adjacent arc-initiating baffles (700) or between the arc-initiating baffle (700) and the housing (100). The extension direction of the airflow channel (710) is set at a second angle with the extension direction of the arc-inlet end (310) and the arc-outlet end (320), and the second angle is 15°~75°.

9. The arc extinguishing system according to claim 8, characterized in that, The arc extinguishing system also includes an arc-initiating baffle (800), which is connected at an angle to the end of the arc-initiating partition (700) away from the arc-splitting partition (600). The housing (100) is provided with an air outlet (110), and the arc-initiating baffle (800) is correspondingly provided with the air outlet (110).

10. The arc-extinguishing system according to claim 1, characterized in that, The arc extinguishing system also includes a handle (900) disposed on the housing (100), the contact assembly (200) being located on the left or right side of the handle (900), and the arc extinguishing chamber (300) being located on the lower side of the contact assembly (200).

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