Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a contact system and an arc extinguish chamber, the contact system comprises a moving contact and a static contact, the arc extinguish chamber comprises a pair of side walls, a grid piece and a moving arc striking piece, the grid piece and the moving arc striking piece are installed between the pair of side walls, one side, facing the contact system, of the moving arc striking piece is provided with a matching part, and the moving contact is provided with a contact piece matched with the matching part. The circuit breaker is characterized in that a U-shaped electric loop is formed at the matching part and / or the head part of the corresponding contact piece, and an electric force moving towards the static contact is applied to an electric arc between the moving contact and the matching part. The advantages are that the arc is prevented from moving towards one side away from the static contact, so that the arc can be prevented from polluting the space of one side, away from the static contact, of the moving contact.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a switch. Background Art

[0002] Switches are widely used in low-voltage power distribution systems. They can close, carry and disconnect currents under normal circuit conditions, providing safety protection for circuits.

[0003] A switch usually includes a contact system, which includes a moving contact and a stationary contact. After the moving contact moves, it contacts or separates with the stationary contact, thereby turning the switch on or off. When the switch is disconnected, an arc will be generated between the moving contact and the stationary contact. Since the arc energy is relatively large, it will affect the breaking capacity of the switch. Therefore, the switch usually also includes an arc extinguishing chamber to extinguish the arc generated when the moving contact and the stationary contact are separated. The arc extinguishing chamber is an important component of the switch, and its arc extinguishing ability directly affects the breaking capacity of the switch.

[0004] In the prior art, at least one arc contact is protrudingly provided at the end of the moving contact body close to the arc extinguishing unit. On the one hand, the arc contact contacts the corresponding static contact earlier than other moving contacts when closing the circuit breaker, and separates from the corresponding static contact later than other moving contacts when opening the circuit breaker. This ensures that only the arc contact has an arc when breaking the current, and no arc is generated in other moving contacts. On the other hand, the arc contact is extended into the arc extinguishing chamber with a narrow slit, and the arc is elongated while the narrow slit effect is used to squeeze the arc and burn the gas-producing material to extinguish the arc. However, during the opening process, an arc will be formed between the arc contact and the arc-starting plate of the arc extinguishing chamber. If there is no effective control, the arc will move rapidly in the arc-starting plate area of ​​the arc extinguishing chamber. As the breaking capacity / number of times increases, the narrow slit inner wall of the arc extinguishing chamber will be burned by the arc or polluted by high-temperature free gas, and the polluted area will gradually expand. In severe cases, it may extend to the main contact area, thereby causing the main contact to break through.

[0005] In view of the above-mentioned prior art, it is necessary to improve the arc extinguishing chamber structure of the existing switch. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0006] The object of the present invention is to provide a switch capable of preventing an arc from moving in the direction of a line connecting a moving contact and a stationary contact, thereby avoiding the occurrence of arc pollution.

[0007] The objective of the present invention is achieved in this way. A switch comprises a contact system and an arc extinguishing chamber, wherein the contact system comprises a moving contact and a stationary contact, the arc extinguishing chamber comprises a pair of side walls, and a grid and a moving arc-striking member installed between the pair of side walls, the moving arc-striking member has a mating portion on the side facing the contact system, the moving contact has a contact piece mating with the mating portion, a U-shaped electrical circuit is formed at the mating portion and / or the head of the corresponding contact piece, and an electric force is applied to the arc between the moving contact and the mating portion to move toward the stationary contact.

[0008] In a specific embodiment of the present invention, a groove with an open end and a closed end is provided on the mating portion, and the closed end is biased toward a side away from the static contact to form a U-shaped electrical circuit with an opening toward the static contact.

[0009] In another specific embodiment of the present invention, the mating portion is formed by bending a metal sheet, and the mating portion includes a first portion, a second portion and a third portion, and the first portion, the second portion and the third portion are connected end to end to form a U-shaped structure, and the opening of the U-shaped structure formed by the three portions faces the static contact.

[0010] In another specific embodiment of the present invention, a mating groove is provided on the head of the contact piece that cooperates with the mating portion, and the head extends to the side away from the static contact to form an "L" shape, and the closed end of the mating groove is biased toward the side away from the static contact to form a U-shaped electrical circuit with an opening toward the static contact.

[0011] In another specific embodiment of the present invention, the moving arc-striking member includes a lower arc-striking member and an upper arc-striking member connected to each other, the lower arc-striking member is a casting, and the upper arc-striking member is a sheet, and the mating portion is located on the side of the lower arc-striking member facing the moving contact.

[0012] In another specific embodiment of the present invention, the groove includes a first groove and a second groove, wherein the first groove is longitudinally arranged, the bottom is formed as an opening facing downward and the top extends upward, and the second groove is transversely arranged, one end is connected to the upper end of the first groove, and the other end is offset and extends toward the side of the first groove away from the static contact and forms the closed end at the end.

[0013] In a further specific embodiment of the present invention, the slot further includes a third slot, which is laterally arranged, one end of which is connected to the first slot and the second slot, and the other end of which is biased and extends toward a side of the first slot close to the stationary contact.

[0014] In a more specific embodiment of the present invention, the moving contact includes a long contact piece and a short contact piece, the long contact piece and the short contact piece are arranged side by side, the long contact piece extends into the interior of the arc extinguishing chamber, and the short contact piece is located outside the arc extinguishing chamber, and the extending end of the long contact piece is provided with a head that cooperates with the moving arc-striking piece.

[0015] In yet another specific embodiment of the present invention, the distance between the opening end of the groove and the end of the moving arc-striking member close to the static contact is A, 10mm≤A≤20mm.

[0016] In yet another specific embodiment of the present invention, the matching groove includes a vertical groove and a horizontal groove, and the vertical groove and the horizontal groove form an "L" shape.

[0017] In the present invention, a U-shaped electrical circuit with an opening toward the side of the static contact is formed at the mating part and / or the head of the corresponding contact piece, and an electric force moving toward the static contact is applied to the arc between the moving contact and the mating part, thereby preventing the arc from moving toward the side away from the static contact, thereby preventing the arc from contaminating the space on the side of the moving contact away from the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a contact system and an arc extinguishing chamber involved in the present invention; Figure 2 It is an explosion schematic diagram of the arc extinguishing chamber involved in the present invention; Figure 3 It is a schematic diagram of the installation of the movable arc-starting member involved in the present invention; Figure 4 It is a structural schematic diagram of the upper arc-starting member involved in the present invention; Figure 5 It is a structural schematic diagram of the lower arc-starting member according to the present invention; Figure 6 A three-dimensional schematic diagram of a first embodiment of the present invention Figure 7 It is a side schematic diagram of a first embodiment of the present invention; Figure 8 It is a side view schematic diagram of a second embodiment of the present invention; Fig. 9 It is a partial schematic diagram of a third embodiment of the present invention; Fig.10 A partial schematic diagram of a fourth embodiment of the present invention; Fig.11 A partial schematic diagram of a fifth embodiment of the present invention; Fig.12 A partial schematic diagram of a sixth embodiment of the present invention; Fig.13A partial schematic diagram of a seventh embodiment of the present invention; Fig.14 It is a partial schematic diagram of an eighth embodiment of the present invention; Fig.15 A partial schematic diagram of a ninth embodiment of the present invention; Fig.16 It is a partial schematic diagram of the tenth embodiment of the present invention.

[0019] In the figure: 1. contact system, 11. moving contact, 111. long contact piece, 1111. head, 112. short contact piece, 12. stationary contact; 2. arc extinguishing chamber, 21. side wall, 22. grid piece, 23. moving arc-starting piece, 231. lower arc-starting piece, 2311. matching part, 23111. first part, 23112. second part, 23113. third part, 23114. fourth part, 23115. fifth part, 2311 6. The sixth part, 2312. The first extension part, 2313. The second extension part, 2314. The third extension part, 232. The upper arc-starting part, 2321. The extension part, 23211. The mounting hole, 2322. The main body, 24. The gas-generating part, 25. The pin-jointed rod; 100. The groove, 101. The first groove, 102. The second groove, 103. The third groove; 200. The insulating sleeve; 300. The matching groove, 301. The vertical groove, 302. The horizontal groove. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0021] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are referring to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solution provided by the present invention. Example 1

[0022] See also Figure 1 The present invention relates to a switch, comprising a contact system 1 and an arc extinguishing chamber 2. The contact system 1 comprises a moving contact 11 and a stationary contact 12. The moving contact 11 rotates to contact or separate with the stationary contact 12, thereby realizing the conduction or separation of the contact system 1, and further realizing the conduction or disconnection of the switch itself. The arc extinguishing chamber 2 is installed on one side of the opening direction of the moving contact 11 and the stationary contact 12. The arc generated between the moving contact 11 and the stationary contact 12 enters the arc extinguishing chamber 2 and is extinguished in the arc extinguishing chamber 2.

[0023] See also Figure 2The arc extinguishing chamber 2 includes a pair of side walls 21 and a grid sheet 22 installed between the pair of side walls 21. The grid sheets 22 are multiple and are arranged at intervals from each other. The arc extinguishing chamber 2 also includes a moving arc-striking member 23, which is correspondingly arranged on one side of the moving contact 11, including a lower arc-striking member 231 and an upper arc-striking member 232, and the lower arc-striking member 231 and the upper arc-striking member 232 are connected and installed.

[0024] Furthermore, a pair of gas producing parts 24 are provided in the arc extinguishing chamber 2. The pair of gas producing parts 24 are arranged at intervals, and the gap between the two forms an arc channel. The grid 22, the side wall 21 and the gas producing parts 24 are connected in series by a pin connecting rod 25, and the pin connecting rod 25 realizes the installation and positioning of the three.

[0025] See also Figure 3 and Figure 4 The lower arc-guiding member 231 is a casting, which is processed from a metal block; the upper arc-guiding member 232 is a sheet, which is bent from a metal sheet. The upper arc-guiding member 232 includes an extension portion 2321 and a main body 2322, wherein the extension portion 2321 is in a strip shape, and the main body 2322 is in a plate shape. The main body 2322 is located outside the array of grid plates 22, parallel to the grid plates 22 and spaced apart. The extension portion 2321 extends downward from the bottom of the main body 2322, and the extension end of the extension portion 2321 is fixedly connected to the lower arc-guiding member 231. In this embodiment, a mounting hole 23211 is provided on the extension portion 2321, and a screw passes through the mounting hole 23211 to connect and install the lower arc-guiding member 231 and the upper arc-guiding member 232.

[0026] See Figure 5 and Figure 6 The lower arc-striking member 231 comprises a matching portion 2311, a first extension portion 2312, a second extension portion 2313 and a third extension portion 2314. The matching portion 2311, the first extension portion 2312, the second extension portion 2313 and the third extension portion 2314 are connected end to end in sequence to form an open enclosure. Specifically, the matching portion 2311 is arranged horizontally on the air inlet side of the arc extinguishing chamber 2, that is, the matching portion 2311 is located on the side of the lower arc-striking member 231 facing the contact system 1. The first extension portion 2312 extends vertically upward perpendicular to the matching portion 2311 at one end of the matching portion 2311; the second extension portion 2313 is obliquely connected between the first extension portion 2312 and the third extension portion 2314; the third extension portion 2314 is arranged in parallel with the first extension portion 2312 and is located on the side of the matching portion 2311 away from the air inlet of the arc extinguishing chamber 2. An opening is formed between the matching portion 2311 and the third extending portion 2314 .

[0027] The moving contact 11 includes a long contact piece 111 and a short contact piece 112, and the long contact piece 111 and the short contact piece 112 are arranged side by side to form the moving contact piece of the moving contact 11. The long contact piece 111 extends into the arc extinguishing chamber 2, and the short contact piece 112 is located outside the arc extinguishing chamber 2. The extending end of the long contact piece 111 is provided with a head 1111 that cooperates with the moving arc-starting member 23. The head 1111 extends to a side away from the stationary contact 12, forming an "L" shape.

[0028] The present invention is characterized in that a groove 100 is provided on the matching portion 2311. The groove 100 can regulate the arc between the long contact piece 111 and the matching portion 2311, and prevent the arc from moving in the direction of the connection line between the moving contact 11 and the stationary contact 12.

[0029] One end of the slot 100 is formed as an open end, and the other end is formed as a closed end. The open end is arranged downward, and the closed end is biased toward the side away from the static contact 12. The current in the matching portion 2311 is formed into a U shape, and the opening of the U shape is toward the static contact 12. An electric force is applied to the arc between the moving contact 11 and the matching portion 2311 to move toward the static contact 12, thereby preventing the moving contact 11 from being contaminated by the arc on the side away from the static contact 12.

[0030] The slot 100 includes a first slot 101 and a second slot 102. In this embodiment, the first slot 101 and the second slot 102 form an "L"-shaped structure. Specifically, the first slot 101 is arranged longitudinally, with the bottom formed as an opening and the top extending upward, and the second slot 102 is arranged transversely, with one end connected to the upper end of the first slot 101 and the other end extending toward the side of the first slot 101 away from the static contact 12 and forming the closed end at the end. Here, transverse arrangement means substantially transverse arrangement and does not require horizontal arrangement.

[0031] like Figure 6 and Figure 7As shown, the distance between the open end of the slot 100 and the end of the moving arc-striking member 23 close to the static contact 12 is A. With this arrangement, the current in the A distance area of ​​the moving arc-striking member 23 will be driven by the electric force away from the static contact 12, causing the arc to move to the side away from the static contact 12. When the arc passes over the slot 100, the opening formed by the current in the matching portion 2311 faces the static contact 12. The current applies an electric force to the arc that drives the side of the static contact 12, thereby preventing the arc from continuing to move away from the static contact 12, and avoiding contamination of the space on the side of the moving contact 11 away from the static contact 12. Preferably, the value range of A is: 10mm≤A≤20mm. Example 2

[0032] Figure 8 It is a schematic diagram of the second embodiment. The difference between the second embodiment and the first embodiment is that the slot 100 also includes a third slot 103. The third slot 103 is also arranged horizontally, one end of which is connected to the first slot 101 and the second slot 102, and the other end is offset and extended toward the side of the first slot 101 close to the static contact 12. Here, the horizontal arrangement also refers to a roughly horizontal arrangement and does not require a horizontal arrangement. The first slot 101, the second slot 102 and the third slot 103 form a "T"-shaped structure. Due to the arrangement of the third slot 103, once the arc is located below the third slot 103, the arc is subjected to an electric force that pushes the arc close to the first slot 101.

[0033] The second slot 102 and the third slot 103 cooperate to stabilize the arc at the slot mouth of the first slot 101, thereby stabilizing the arc and preventing the arc from contaminating the side of the moving contact 11 away from the stationary contact 12. Example 3

[0034] Fig. 9 Schematic diagram of the third embodiment. The difference between this embodiment and the first and second embodiments is that an insulating sleeve 200 is sleeved on the rear side of the head 1111 of the long contact piece 111, and the insulating sleeve 200 is fixedly mounted on the long contact piece 111. The insulating sleeve 200 covers the side of the head 1111 away from the contact point on the long contact piece 111.

[0035] Similarly, on the basis of the second embodiment, an insulating sleeve 200 may be sleeved on the rear side of the head 1111 of the long contact piece 111 to form other embodiments, which are basically the same as the third embodiment and will not be described again. Example 4

[0036] Fig.10is a schematic diagram of the fourth embodiment. The difference between this embodiment and the first embodiment is that: the groove 100 only includes the second groove 102, and the second groove 102 is arranged horizontally, and is open at one end facing the static contact 12, and closed at one end away from the static contact 12. The matching portion 2311 includes a first portion 23111, a second portion 23112 and a third portion 23113, and the first portion 23111, the second portion 23112 and the third portion 23113 are connected end to end to form a U-shaped structure, and the U-shaped structure formed by the three is open toward the static contact 12. When an arc is generated, the current in the matching portion 2311 is in a U-shape with an opening toward the static contact 12. The current applies an electric force to the arc to drive the arc toward one side of the static contact 12, thereby preventing the arc from continuing to move toward the side away from the static contact 12. The movable arc-striking member 23 in this embodiment is correspondingly arranged on one side of the movable contact 11, and comprises a lower arc-striking member 231 and an upper arc-striking member 232, and the lower arc-striking member 231 and the upper arc-striking member 232 are fixedly connected and installed. The lower arc-striking member 231 is a casting, which is processed from a metal block. Example 5

[0037] Fig.11 Schematic diagram of the fifth embodiment. The difference between this embodiment and the fourth embodiment is that the lower arc-starting member 231 and the upper arc-starting member 232 are integrally formed and formed by bending a metal sheet, and their shape is the same as that of the fourth embodiment. Similarly, the matching portion 2311 includes a first portion 23111, a second portion 23112 and a third portion 23113, and the first portion 23111, the second portion 23112 and the third portion 23113 are connected end to end to form a U-shaped structure, and the U-shaped structure formed by the three is open toward the static contact 12. When an arc is generated, the current in the matching portion 2311 forms a U-shape opening toward the static contact 12. Example 6

[0038] Fig.12Schematic diagram of the sixth embodiment. In this embodiment, the lower arc-guiding member 231 and the upper arc-guiding member 232 are integrally formed and formed by bending a metal sheet, and the matching portion 2311 includes a first portion 23111, a second portion 23112 and a third portion 23113, and the first portion 23111, the second portion 23112 and the third portion 23113 are connected end to end to form a U-shaped structure, and the opening of the U-shaped structure formed by the three is toward the static contact 12. The difference between this embodiment and the fifth embodiment is that the matching portion 2311 also includes a fourth portion 23114, a fifth portion 23115 and a sixth portion 23116. The fourth part 23114, the fifth part 23115 and the sixth part 23116 are also connected end to end to form a U-shaped structure with an opening facing upward, and the U-shaped structure formed by the fourth part 23114, the fifth part 23115 and the sixth part 23116 is located on the side of the U-shaped structure formed by the first part 23111, the second part 23112 and the third part 23113 close to the static contact 12. The first part 23111 and the fourth part 23114 are spaced apart, and the fourth part 23114 is connected to the third part 23113. Example 7

[0039] Fig.13 2 is a schematic diagram of the seventh embodiment. The difference between this embodiment and the sixth embodiment is that the width between the first portion 23111 and the third portion 23113 is larger. Example 8

[0040] Fig.14 The eighth embodiment is a schematic diagram of the eighth embodiment. The difference between this embodiment and the fifth embodiment is that the lower arc-guiding member 231 and the upper arc-guiding member 232 are two independent parts, which are fixedly connected, and the lower arc-guiding member 231 and the upper arc-guiding member 232 are both formed by bending metal sheets. Example 9

[0041] Fig.15Schematic diagram of the ninth embodiment. The difference between this embodiment and the above embodiments is that the mating portion 2311 of the lower arc-guiding member 231 does not form a U-shaped electrical circuit by bending or slotting, but a mating slot 300 is provided on the head 1111 of the long contact piece 111, and the closed end of the mating slot 300 is biased toward the side away from the static contact 12, and the mating slot 300 forms a U-shaped electrical circuit with an opening toward the static contact 12. At this time, the mating slot 300 only includes a transverse slot 302. Further, since the head 1111 has no sinking structure on the side of the U-shaped electrical circuit close to the static contact 12, the opening of the U-shaped electrical circuit is connected to a vertical slot 301. At this time, the mating slot 300 includes a vertical slot 301 and a transverse slot 302, and the vertical slot 301 and the transverse slot 302 form an "L" shape. Both of the above structures form a U-shaped electrical circuit with an opening toward the static contact 12 in the head 1111 . Similarly, the U-shaped electrical circuit generates an electric force toward the static contact 12 by the arc between the long contact piece 111 and the matching portion 2311 .

[0042] Example 10 Fig.16 Schematic diagram of the tenth embodiment. The difference between this embodiment and the ninth embodiment is that: a groove 100 is provided on the matching portion 2311 of the lower arc-striking member 231. The groove 100 includes a first groove 101 and a second groove 102. In this embodiment, the first groove 101 and the second groove 102 form an "L"-shaped structure. Specifically, the first groove 101 is arranged longitudinally, with the bottom formed as an opening and the top extending upward. The second groove 102 is arranged transversely, with one end connected to the upper end of the first groove 101 and the other end extending toward the side of the first groove 101 away from the static contact 12 and forming the closed end at the end; and a matching groove 300 is provided on the head 1111 of the long contact piece 111. The matching groove 300 includes a vertical groove 301 and a horizontal groove 302. The vertical groove 301 and the horizontal groove 302 form an "L" shape, and the matching groove 300 is offset to the side away from the static contact 12. The characteristic of this embodiment is that a U-shaped electrical circuit with an opening toward the static contact 12 is formed in the head 1111 and the mating portion 2311, and both U-shaped electrical circuits generate an electric force toward the static contact 12 for the arc between the long contact piece 111 and the mating portion 2311.

[0043] In the above embodiment, the contact piece of the moving contact 11 corresponding to the matching portion 2311 is a long contact piece 111, but for other forms of moving contacts 11, the contact pieces matching with the matching portion 2311 may be several contact pieces or all contact pieces, which also falls within the protection scope of the present invention.

Claims

1. A switch, comprising a contact system (1) and an arc extinguishing chamber (2), wherein the contact system (1) comprises a moving contact (11) and a stationary contact (12), the arc extinguishing chamber (2) comprises a pair of side walls (21), and a grid (22) and a moving arc-striking member (23) installed between the pair of side walls (21), the moving arc-striking member (23) having a matching portion (2311) on a side facing the contact system (1), and the moving contact (11) having a contact piece matching with the matching portion (2311), characterized in that: A U-shaped electrical circuit is formed at the mating portion (2311) and / or the head of the corresponding contact piece, and an electric force is applied to the arc between the moving contact (11) and the mating portion (2311) to move in the direction of the stationary contact (12).

2. A switch according to claim 1, characterized in that: The mating portion (2311) is provided with a groove (100) having an open end at one end and a closed end at the other end, and the closed end is biased toward a side away from the stationary contact (12), forming a U-shaped electrical circuit with an opening toward the stationary contact (12).

3. A switch according to claim 1, characterized in that: The mating portion (2311) is formed by bending a metal sheet, and the mating portion (2311) includes a first portion (23111), a second portion (23112) and a third portion (23113). The first portion (23111), the second portion (23112) and the third portion (23113) are connected end to end in sequence to form a U-shaped structure, and the opening of the U-shaped structure formed by the three portions faces the static contact (12).

4. A switch according to claim 1, characterized in that: A mating groove (300) is provided on the head of the contact piece that cooperates with the mating portion (2311), and the head extends to a side away from the stationary contact (12) to form an L shape. The closed end of the mating groove (300) is biased toward a side away from the stationary contact (12) to form a U-shaped electrical circuit with an opening toward the stationary contact (12).

5. A switch according to claim 1, characterized in that: The movable arc-striking member (23) comprises a lower arc-striking member (231) and an upper arc-striking member (232) which are connected to each other, the lower arc-striking member (231) is a casting, and the upper arc-striking member (232) is a sheet, and the matching portion (2311) is located on the side of the lower arc-striking member (231) facing the movable contact (11).

6. A switch according to claim 2, characterized in that: The groove (100) includes a first groove (101) and a second groove (102), wherein the first groove (101) is arranged longitudinally, with the bottom formed as an opening facing downward and the top extending upward, and the second groove (102) is arranged transversely, with one end connected to the upper end of the first groove (101) and the other end extending toward the side of the first groove (101) away from the static contact (12) and forming the closed end at the end.

7. A switch according to claim 6, characterized in that: The groove (100) further includes a third groove (103), which is arranged transversely, with one end connected to the first groove (101) and the second groove (102), and the other end extending toward the side of the first groove (101) close to the static contact (12).

8. A switch according to any one of claims 2, 3 or 4, characterized in that: The moving contact (11) comprises a long contact piece (111) and a short contact piece (112), wherein the long contact piece (111) and the short contact piece (112) are arranged side by side, the long contact piece (111) extends into the interior of the arc extinguishing chamber (2), and the short contact piece (112) is located outside the arc extinguishing chamber (2), and a head (1111) is provided on the extending end of the long contact piece (111) for cooperating with the moving arc-striking member (23).

9. A switch according to claim 2, characterized in that: The distance between the opening end of the groove (100) and the end of the movable arc-striking member (23) close to the static contact (12) is A, 10mm≤A≤20mm.

10. A switch according to claim 4, characterized in that: The matching groove (300) comprises a vertical groove (301) and a horizontal groove (302), and the vertical groove (301) and the horizontal groove (302) form an L shape.

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