Contact structure and contactor

Abstract

The utility model discloses a contact structure and a contactor. The contact structure comprises a contact body and an arc striking piece, wherein the contact body comprises a first section, a second section, a third section and a static arc guide section which are connected in sequence; the upper surface of the third section is used for arranging a static contact or the upper surface of the third section is a static contact surface, and one end of the static arc guide section is adjacent to the static contact or the static contact surface; the first section and the third section are arranged in parallel, and the static guide arc section is obliquely arranged and inclines towards the direction far away from the first section; the arc striking piece comprises a static arc striking section, a mounting section, a bending section, a straight section, an auxiliary static arc striking section and a matching section which are connected in sequence; the mounting section is fixed on the upper surface of the first section; one end of the static arc striking section extends towards the height direction, so that the total length of the static arc striking section exceeds the height of the contact body; the bending section is located on one side of the second section, the straight section is located on one side of the third section, the auxiliary static arc striking section is located on one side of the static arc guiding section, and the matching section is inserted into the static arc striking section; the arc striking device has the advantage of being good in arc striking effect.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, and is a contactor, and specifically a contact structure of a contactor. Background Art

[0002] For a contactor, its connection and disconnection are realized by the contact and separation of the moving and contact structures. For a contactor, as the current specification increases, the arc becomes more difficult to extinguish during disconnection. Therefore, existing contactors with larger current specifications often have an arc extinguishing grid group arranged around the contact structure, and an arc starting piece arranged on the contact structure, through which the arc is introduced into the arc extinguishing grid group for extinguishing.

[0003] A contact structure and a contactor as disclosed in CN220439506U include a contact assembly, wherein the contact assembly includes: a contact, including a plurality of contact segments connected in sequence, wherein the plurality of contact segments enclose an accommodating groove; an arc-starting member, including a magnetic conductive portion and an arc-starting member, wherein the magnetic conductive portion includes a plurality of magnetic conductive segments corresponding one-to-one to the contact segments, the magnetic conductive segment located at the first end of the magnetic conductive portion extends to form the arc-starting portion, at least a portion of the magnetic conductive portion is arranged in the accommodating groove, and the arc-starting portion is arranged outside the accommodating groove.

[0004] The contact structure of this contactor has a certain arc extinguishing effect, but the arc extinguishing effect is still not very ideal, because the arc extinguishing grid group is located above the contact assembly (also called contact structure) and the arc-starting piece. Although the arc can enter the arc extinguishing grid group from the static arc-starting section of the arc-starting piece, there is still a straight section (part of the arc-starting piece) from the contact structure to the static arc-starting section, and the arc-starting effect of this straight section is still relatively weak.

[0005] Therefore, how to further optimize the contact structure and arc-starting component structure is an issue that cannot be ignored for contactors that pursue higher performance. Summary of the invention

[0006] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a contact structure.

[0007] The present application provides: a contact structure, which includes a contact body and an arc-striking member; wherein the contact body includes a first section, a second section, a third section and a static arc-guiding section connected in sequence; the upper surface of the third section is used to set a static contact or the upper surface of the third section is a static contact surface, and one end of the static arc-guiding section is adjacent to the static contact or the static contact surface; the first section and the third section are arranged in parallel, the static arc-guiding section is arranged obliquely and the static arc-guiding section is inclined in a direction away from the first section; the arc-striking member includes a static arc-striking section, a mounting section, a bending section, a straight section, an auxiliary static arc-striking section and a mating section connected in sequence; the mounting section is fixed on the upper surface of the first section, and one end of the static arc-striking section extends in a height direction so that the total length of the static arc-striking section exceeds the height of the contact body; the bending section is located on one side of the second section, the straight section is located on one side of the third section, the auxiliary static arc-striking section is located on one side of the static arc-guiding section, and the mating section is plugged into the static arc-striking section.

[0008] Compared with the prior art, a static arc guide section is added on the basis of the contact structure of the prior art, and the static arc guide section is inclined (inclined in the direction away from the first section). This is because the arc extinguishing grid group is often in this direction. Through such a design, a part of the arc can be introduced into the arc extinguishing grid group by using the inclined static arc guide section. At the same time, the arc-starting member also includes an auxiliary static arc-starting section, which can also play a role in introducing a part of the arc into the arc extinguishing grid group. Therefore, the arc extinguishing performance of the contact structure of this structure will be better than the prior art, and the performance of the contactor will be improved.

[0009] In some embodiments of the present application, the number of bending sections, straight sections and auxiliary static arc-starting sections is two, the two bending sections are located on both sides of the second section, the two straight sections are located on both sides of the third section, and the two auxiliary static arc-starting sections are located on both sides of the static guide arc section.

[0010] With this structure, these sections are equivalent to the second section, the third section and the static arc guide section surrounding the contact body, which can enhance the arc guiding effect and help improve the arc extinguishing performance of the product.

[0011] In some embodiments of the present application, a first mounting hole is provided on the first section and the mounting section, a first avoidance hole is provided on the mating section, and the orthographic projection of the first avoidance hole on the first section covers the first mounting hole; and / or, a second mounting hole is provided on the first section and the mounting section, a second avoidance portion is provided on the static guide arc section, and the orthographic projection of the second avoidance portion on the first section covers the second mounting hole.

[0012] With this structure, the design of the first mounting hole, the first avoidance hole, the second avoidance portion and the second avoidance portion will facilitate the installation of the contact structure.

[0013] In some embodiments of the present application, a first limiting portion is further provided on the mounting segment, one end of the first limiting portion is connected to the mounting segment, the other end of the first limiting portion is abutted against the lower surface of the third segment or the other end of the first limiting portion is adjacent to the lower surface of the third segment, and the first limiting portion is just below the static contact point or the static contact surface.

[0014] The design of the first limiting portion is conducive to limiting the third section and reducing the degree of deformation of the third section due to stress.

[0015] In some embodiments of the present application, a terminal block is further included. The terminal block is located below the first section. The terminal block and the first section are an integral part or the terminal block and the first section are fixed or the terminal block and the first section and the mounting section are fixed together.

[0016] The design of the terminal block will facilitate external wiring.

[0017] In some embodiments of the present application, a second limiting portion extends from a side portion of the mounting section.

[0018] The design of the second limiting portion will facilitate the limiting of the installation section and the periphery, and facilitate the installation of the installation section.

[0019] A contactor comprises a base, an upper cover, a top cover, a contact support and a moving contact; the upper cover is arranged on the base, and the top cover is arranged on the upper cover; the base and the upper cover form at least one phase contact arc extinguishing space, the contact support and the contact arc extinguishing space are slidingly arranged, the moving contact is arranged on the contact support and moves synchronously with the contact support, and the moving contact is located in the contact arc extinguishing space; two groups of the above-mentioned contact structures are arranged in the contact arc extinguishing space, and the two groups of contact structures are arranged on both sides of the moving contact; two groups of arc extinguishing grid groups are also arranged in the contact arc extinguishing space, the two groups of arc extinguishing grid groups correspond to the two groups of contact structures one by one, and the static arc-starting section in each group of contact structures extends to the side of an arc extinguishing grid in the corresponding arc extinguishing grid group.

[0020] The contactor adopting this contact structure has a better arc striking effect and can improve the performance of the product.

[0021] In some embodiments of the present application, a short-circuit is further included in the arc extinguishing space of the contact, and the short-circuit short-circuit two groups of arc extinguishing grid groups; the short-circuit is located above the moving contact, and both ends of the short-circuit are short-circuited arc-starting sections.

[0022] The short-circuit design will be more conducive to improving the arc extinguishing effect and fully utilizing the arc extinguishing grids in the two arc extinguishing grid groups.

[0023] In some embodiments of the present application, two groups of arc extinguishing grid group plug-in areas and a short-circuit plate mounting groove are provided on the upper cover; a positioning portion is provided on one of the short-circuit plate mounting groove and the short-circuit plate, and a positioning hole is provided on the other, the positioning portion is inserted into the positioning hole to form a positioning of the short-circuit plate, and an abutting portion that abuts against the upper surface of the short-circuit plate is provided on the top cover.

[0024] The design of the positioning column and the positioning hole will facilitate the installation of the shorting piece, and the design of the abutting portion will facilitate the stable installation of the shorting piece.

[0025] In some embodiments of the present application, a spring sheet is further included above the moving contact, moving contact arc guide sections are provided at both ends of the moving contact, the spring sheet is located between the two moving contact arc guide sections, and the spring sheet abuts against the upper surface of the moving contact.

[0026] The design of the spring can provide the moving contact with a medium contact pressure. The design of the arc-guiding section of the moving contact will further improve the arc-starting effect and arc-extinguishing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram showing a contact structure in a contactor in Example 1 of the present application is shown;

[0029] Figure 2 A side view of the contact structure in the contactor of Embodiment 1 of the present application is shown;

[0030] Figure 3 A positional relationship diagram of a contact structure, a shorting piece, and an arc extinguishing grid piece group in the same contact arc extinguishing space in the contactor of Example 1 of the present application is shown;

[0031] Figure 4 A three-dimensional diagram of a contactor according to Embodiment 1 of the present application is shown;

[0032] Figure 5 A cross-sectional view of a contactor according to Embodiment 1 of the present application is shown;

[0033] Figure 6 The figure shows the assembly schematic diagram of the shorting piece in the contactor of Example 1 of the present application;

[0034] Figure 7 A schematic structural diagram of the top cover in the contactor of Example 1 of the present application is shown. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "primary" and "secondary" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, the main feature being "above" or "below" the second feature may mean that the main feature is in direct contact with the second feature, or that the main feature is in indirect contact with the second feature through an intermediate medium. Moreover, the main feature being "above", "above" and "above" the second feature may mean that the main feature is directly above or obliquely above the second feature, or simply means that the main feature is higher in level than the second feature. The main feature being "below", "below" and "below" the second feature may mean that the main feature is directly below or obliquely below the second feature, or simply means that the main feature is higher in level and has a lower electrical connection with the three-phase power supply than the second feature. Example

[0040] like Figure 1-Figure 7 As shown, an embodiment of the present application provides a contactor.

[0041] The contactor comprises a housing structure, a contact assembly, a contact support 200, a reset spring, an arc extinguishing grid set 300, a shorting piece 400 and an electromagnetic system.

[0042] The housing structure includes a base 101, a pedestal 102, an upper cover 103 and a top cover 104. The base 102 is located on the base 101, the upper cover 103 is located on the base 102, and the top cover 104 is located on the upper cover 103. Here, the base 102 and the base 101 are fastened by bolts, and the top cover 104, the upper cover 103 and the base 102 are also fastened by bolts.

[0043] The contact support 200 and the housing structure are arranged in a sliding manner, and can slide downward when the electromagnetic system is powered on; and then return to the original position through the reset spring when the electromagnetic system is powered off. Of course, this principle is already a conventional technical means in the field of contactors, and will not be repeated here.

[0044] The upper cover 103 and the base 102 form a three-phase contact arc extinguishing space 100a, and the arc extinguishing grid group 300, the contact assembly and the shorting piece 400 are all arranged in the contact arc extinguishing space 100a. Since the arrangement methods of the arc extinguishing grid group 300, the contact assembly and the shorting piece 400 in the three-phase contact arc extinguishing space 100a are basically the same, one group is taken as an example.

[0045] The contact assembly in each phase contact arc extinguishing space 100 a includes two contact structures and a moving contact 201 . The moving contact 201 is fixed on a contact support 200 and moves synchronously with the contact support 200 .

[0046] The two contact structures are arranged on both sides of the moving contact 201 in a mirror relationship, and there are two arc extinguishing grid sets 300 in each phase contact arc extinguishing space 100a, which are respectively located beside the two contact structures. Take one of the contact structures and the arc extinguishing grid set 300 as an example.

[0047] The arc extinguishing grid set 300 includes four arc extinguishing grids, which are plugged into the arc extinguishing grid set plugging area 103a of the upper cover 103.

[0048] The contact structure includes a contact structure, which includes a contact body 500 and an arc-starting member 510 .

[0049] The contact body 500 includes a first section 501, a second section 502, a third section 503 and a static guide arc section 504 which are connected in sequence. Here, the first section 501 is straight, the third section 503 is also straight, and the second section 502 is bent. Therefore, the first section 501 and the third section 503 are connected by the second section 502, so that the first section 501 and the third section 503 can be arranged in parallel. Here, a static contact 505 is arranged on the upper surface of the third section 503, and the static contact 505 here is in contact with the moving contact 202 on the moving contact 201. The static guide arc section 504 is arranged obliquely, that is, the static guide arc section 504 and the third section 503 are arranged at an angle, and the inclination direction of the static guide arc section 504 here is inclined away from the direction where the first section 501 is located, that is, it is gradually approaching the corresponding arc extinguishing grid group 300. In this way, through the design of the static guide arc section 504, the arc will be easier to enter the corresponding arc extinguishing grid group 300. In this embodiment, a static contact 505 is provided on the third section 503 . Of course, the static contact 505 may not be used, and a static contact surface (contacting the moving contact 201 ) may be directly formed through the upper surface of the third section 503 .

[0050] The arc-striking member 510 includes a static arc-striking section 511, a mounting section 512, a bent section 513, a straight section 514, an auxiliary static arc-striking section 515 and a matching section 516 which are connected in sequence. Here, the static arc-striking section 511 and the mounting section 512 are vertically arranged, and the static arc-striking section 511 extends in the height direction, so that the total length of the static arc-striking section 511 exceeds the height of the contact body 500, and the static arc-striking section 511 extends to the side of the arc-extinguishing grid group 300, which is conducive to arc-striking.

[0051] The mounting section 512 is used to be fixed to the first section 501 .

[0052] The bending section 513 is located at the side of the second section 502. In this embodiment, there are two bending sections 513, which are located at both sides of the second section 502.

[0053] The straight section 514 is located at the side of the third section 503. In this embodiment, there are two straight sections 514, which are located at both sides of the third section 503.

[0054] The auxiliary static arc-starting segment 515 is located at the side of the static arc-starting segment 504. In this embodiment, there are two auxiliary static arc-starting segments 515, which are arranged at both sides of the static arc-starting segment 504.

[0055] The mating section 516 is provided with an inserting protrusion 517 , which is inserted into the inserting hole 516 a on the static arc-starting section 511 .

[0056] That is to say, in this embodiment, the arc-starting member 510 basically surrounds the second section 502, the third section 503 and the static arc-guide section 504 of the contact body 500, which can enhance the arc-guiding effect and help improve the arc-extinguishing performance of the product.

[0057] In this embodiment, the arc-starting member 510 and the contact body 500 are fastened by screws. Of course, in addition to fastening by screws, riveting can also be used. In order to facilitate the fastening by means of screw fastening, riveting fastening, etc., corresponding mounting holes are also provided on the first section 501 and the mounting section 512. Specifically, a first mounting hole 5010 is provided on the first section 501 and the mounting section 512, and a first avoidance hole 5160 is provided on the matching section 516. The orthographic projection of the first avoidance hole 5160 on the first section 501 covers the first mounting hole 5010, so that the first avoidance hole 5160 can realize the assembly of the first section 501 and the mounting section 512. A second mounting hole 5011 is provided on the first section 501 and the mounting section 512, and a second avoidance portion 5040 is provided on the static arc guide section 504. The orthographic projection of the second avoidance portion 5040 on the first section 501 covers the second mounting hole 5011. The second avoidance portion 5040 is a through slot, and of course a through hole design may also be used. In this way, the second avoidance portion 5040 can realize the assembly of the first section 501 and the installation section 512.

[0058] In order to reduce the deformation of the third section 503 under stress, a first limiting portion 512a is provided on the mounting section 512, wherein the first limiting portion 512a and the mounting section 512 are vertically arranged, one end of the first limiting portion 512a is connected to the mounting section 512, and the other end of the first limiting portion 512a is adjacent to the lower surface of the third section 503. Here, the first limiting portion 512a is just below the static contact 505, so that even if the third section 503 is deformed under stress, it can be supported by the first limiting portion 512a. Of course, here, the first limiting portion 512a and the lower surface of the third section 503 can also be directly arranged to be in abutment with each other.

[0059] A second limiting portion 512 b is further provided on the side of the installation section 512 , and the second limiting portion 512 b can achieve limiting cooperation with the base 102 .

[0060] A wiring board 506 is also fixed below the first section 501. The wiring board 506 is used for wiring, so as to facilitate the connection of the contactor to a required circuit. The wiring board 506, the first section 501, and the mounting section 512 are fastened together by screws. Of course, in addition to this method, the wiring board 506 and the first section 501 can also be made into an integral part, or the wiring board 506 and the first section 501 can be fastened by screws.

[0061] In some embodiments of the present application, a terminal block 506 is further included. The terminal block 506 is located below the first section 501 . The terminal block 506 and the first section 501 are integrally formed or the terminal block 506 and the first section 501 are fixed or the terminal block 506 and the first section 501 and the mounting section 512 are fixed together.

[0062] The shorting piece 400 is a U-shaped structure, and includes two shorting arc-starting segments 401 and a body segment 402, and the two shorting arc-starting segments 401 are connected through the body segment 402. The two shorting arc-starting segments 401 of the shorting piece 400 are respectively arranged adjacent to the two arc-extinguishing grid sets 300, so that the arc-starting effect can be improved through the shorting piece 400.

[0063] The shorting piece 400 here is fixed on the upper cover 103, and a shorting piece installation groove 103b is provided on the upper cover 103. There is one shorting piece installation groove 103b in the arc extinguishing space 100a of one phase contact, which is located in the middle of the two arc extinguishing grid group plug-in areas 103a. Two positioning parts 103b1 are provided in the shorting piece installation groove 103b, and a positioning hole 4020 is opened on the body section 402, and the positioning hole 4020 is sleeved on the positioning part 103b1. The top cover 104 is provided with a contact part 104a corresponding to the body section 402, and the contact part 104a is in contact with the body section 402. In this way, by fixing the top cover 104 and the upper cover 103, the shorting piece 400 can also be fixed. In addition, a positioning portion 103 b 1 may be provided on the shorting link 400 , and a positioning hole 4020 may be provided in the shorting link installation slot 103 b , which may also play a role in positioning and installing the shorting link 400 .

[0064] The shorting piece 400 is generally located above the moving contact 201. The two ends of the moving contact 201 are moving contact arc guide sections 203, and the arc striking effect can also be improved through the moving contact arc guide sections 203. A spring 204 is provided between the two moving contact arc guide sections 203 of the moving contact 201. The spring 204 here abuts against the upper surface of the moving contact 201, and can provide contact pressure for the moving contact 201.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A contact structure, comprising a contact body and an arc-starting member; characterized in that: The contact body includes a first section, a second section, a third section and a static arc-guiding section which are connected in sequence; the upper surface of the third section is used to set a static contact or the upper surface of the third section is a static contact surface, and one end of the static arc-guiding section is adjacent to the static contact or the static contact surface; the first section and the third section are arranged in parallel, the static arc-guiding section is arranged obliquely and the static arc-guiding section is inclined in a direction away from the first section; the arc-starting member includes a static arc-starting section, an installation section, a bending section, a straight section, an auxiliary static arc-starting section and a mating section which are connected in sequence; the installation section is fixed on the upper surface of the first section, and one end of the static arc-starting section extends in a height direction so that the total length of the static arc-starting section exceeds the height of the contact body; the bending section is located on one side of the second section, the straight section is located on one side of the third section, the auxiliary static arc-starting section is located on one side of the static arc-starting section, and the mating section is plugged into the static arc-starting section.

2. A contact structure according to claim 1, characterized in that: There are two bending sections, two straight sections and two auxiliary static arc-starting sections. The two bending sections are located on both sides of the second section, the two straight sections are located on both sides of the third section, and the two auxiliary static arc-starting sections are located on both sides of the static arc-starting section.

3. A contact structure according to claim 1, characterized in that: A first mounting hole is provided on the first section and the mounting section, a first avoidance hole is provided on the mating section, and the orthographic projection of the first avoidance hole on the first section covers the first mounting hole; and / or a second mounting hole is provided on the first section and the mounting section, a second avoidance portion is provided on the static guide arc section, and the orthographic projection of the second avoidance portion on the first section covers the second mounting hole.

4. A contact structure according to claim 1, characterized in that: A first limiting portion is also provided on the mounting section, one end of the first limiting portion is connected to the mounting section, the other end of the first limiting portion is abutted against the lower surface of the third section or the other end of the first limiting portion is adjacent to the lower surface of the third section, and the first limiting portion is just below the static contact point or the static contact surface.

5. A contact structure according to any one of claims 1 to 4, characterized in that: It also includes a wiring board, which is located below the first section. The wiring board and the first section are an integral part, or the wiring board and the first section are fixed, or the wiring board and the first section and the installation section are fixed together.

6. A contact structure according to claim 1, characterized in that: A second limiting portion extends from the side of the installation section.

7. A contactor, comprising a base, an upper cover, a top cover, a contact support and a moving contact; the upper cover is arranged on the base, and the top cover is arranged on the upper cover; the base and the upper cover form at least one phase contact arc extinguishing space, the contact support and the contact arc extinguishing space are slidingly arranged, the moving contact is arranged on the contact support and moves synchronously with the contact support, and the moving contact is located in the contact arc extinguishing space; characterized in that: Two groups of contact structures as described in any one of claims 1 to 6 are arranged in the contact arc extinguishing space, and the two groups of contact structures are arranged on both sides of the moving contact; two groups of arc extinguishing grid groups are also arranged in the contact arc extinguishing space, and the two groups of arc extinguishing grid groups correspond to the two groups of contact structures one by one, and the static arc-strike section in each group of contact structures extends to the side of an arc extinguishing grid in the corresponding arc extinguishing grid group.

8. A contactor according to claim 7, characterized in that: It also includes a short-circuit piece arranged in the arc extinguishing space of the contact, which short-circuits the two groups of arc extinguishing grid pieces; the short-circuit piece is located above the moving contact, and the two ends of the short-circuit piece are short-circuited arc-starting sections.

9. A contactor according to claim 8, characterized in that: The upper cover is provided with two groups of arc extinguishing grid group plug-in areas and a short-circuit plate installation groove; one of the short-circuit plate installation groove and the short-circuit plate is provided with a positioning portion, and the other is provided with a positioning hole, the positioning portion is inserted into the positioning hole to form the positioning of the short-circuit plate, and the top cover is provided with an abutting portion that abuts against the upper surface of the short-circuit plate.

10. A contactor according to claim 7, characterized in that: It also includes a spring sheet arranged above the moving contact. Moving contact arc guide sections are arranged at both ends of the moving contact. The spring sheet is located between the two moving contact arc guide sections, and the spring sheet abuts against the upper surface of the moving contact.

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