CN222214070U - Contact structure and contactor - Google Patents

Abstract

The application discloses a contact structure and a contactor, comprising 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 guiding section which are sequentially connected, the upper surface of the third section is used for setting a static contact or the upper surface of the third section to be a static contact surface, 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 obliquely arranged and is inclined towards the direction far away from the first section, the arc striking piece comprises a static arc guiding section, a mounting section, a bending section, a straight section, an auxiliary static arc guiding section and a matching section which are sequentially connected, the mounting section is fixed on the upper surface of the first section, one end of the static arc guiding section extends towards the height direction so that the total length of the static arc guiding section exceeds the height of the contact body, the bending section is positioned on one side of the second section, the straight section is positioned on one side of the third section, the auxiliary static arc guiding section is positioned on one side of the static arc guiding section, and the matching section is spliced on the static arc guiding section.

Description

Contact structure and contactor

Technical Field

The application relates to the field of low-voltage switch electricity, in particular to a contactor, and specifically relates to a contact structure of the contactor.

Background

The contactor is connected and disconnected through the contact and separation of the moving and contact structures, and the arc is difficult to extinguish during disconnection along with the increase of current specification. Therefore, in the existing contactor with larger current specification, an arc extinguishing grid sheet group is often arranged on the periphery of a contact structure, an arc striking piece is arranged on the contact structure, and an arc is introduced into the arc extinguishing grid sheet group through the arc striking piece to extinguish.

The contact structure comprises a contact assembly, an arc striking piece and an arc striking part, wherein the contact comprises a contact and an arc striking part, the contact comprises a plurality of contact sections which are sequentially connected, the contact sections are enclosed into a containing groove, the arc striking piece comprises a magnetic conduction part and an arc striking part, the magnetic conduction part comprises a plurality of magnetic conduction sections which are in one-to-one correspondence with the contact sections, the magnetic conduction sections positioned at the first end of the magnetic conduction part extend to form the arc striking part, at least part of the magnetic conduction part is arranged in the containing groove, and the arc striking part is arranged outside the containing groove.

The contact structure of the contactor has a certain arc extinguishing effect, but the arc extinguishing effect is still not ideal, because the arc extinguishing grid sheet group is positioned above the contact assembly (also called the contact structure) and the arc striking piece, although the arc can enter the arc extinguishing grid sheet group from the static arc striking section of the arc striking piece, a section of straight part (a part of the arc striking piece) is still arranged from the contact structure to the static arc striking section, and the arc striking effect of the section of straight part is still relatively weak.

Therefore, how to further optimize the contact structure and the striking member structure is a non-negligible problem for contactors that pursue higher performance.

Disclosure of Invention

In view of the above, the present application aims to overcome the defects in the prior art, and aims to provide a contact structure.

The application provides a contact structure which 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 guiding section which are sequentially connected, the upper surface of the third section is used for setting a static contact or the upper surface of the third section to be a static contact surface, 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 obliquely arranged and is inclined towards the direction far away from the first section, the arc striking piece comprises a static arc guiding section, a mounting section, a bending section, a straight section, an auxiliary static arc guiding section and a matching section which are sequentially connected, the mounting section is fixed on the upper surface of the first section, one end of the static arc guiding section extends towards the height direction so that the total length of the static arc guiding section exceeds the height of the contact body, the bending section is positioned on one side of the second section, the straight section is positioned on one side of the third section, the auxiliary static arc guiding section is positioned on one side of the static arc guiding section, and the matching section is spliced on the static arc guiding section.

Compared with the prior art, a section of static arc-guiding section is added on the basis of the contact structure of the prior art, and the static arc-guiding section is obliquely arranged (obliquely towards the direction away from the first section), because the arc-extinguishing grid sheet group is always in the direction, and a part of electric arc can be led into the arc-extinguishing grid sheet group by utilizing the obliquely arranged static arc-guiding section through the design. Meanwhile, the arc striking piece also comprises an auxiliary static arc striking section, and can also be used for introducing a part of electric arc into the arc extinguishing grid sheet group. Therefore, the arc extinguishing performance of the contact structure with the structure is superior to that of the prior art, and the performance of the contactor is improved.

In some embodiments of the present application, the number of the bending sections, the straight sections and the auxiliary static arc-guiding sections is two, the two bending sections are respectively located at two sides of the second section, the two straight sections are respectively located at two sides of the third section, and the two auxiliary static arc-guiding sections are respectively located at two sides of the static arc-guiding section.

By adopting the structure, the sections of the structure are equivalent to the second section, the third section and the static arc guide section which surround the contact body, so that the arc guide effect can be improved, and the arc extinguishing performance of the product can be improved.

In some embodiments of the present application, the first section and the mounting section are both provided with a first mounting hole, the mating section is provided with a first avoiding hole, the front projection of the first avoiding hole on the first section covers the first mounting hole, and/or the first section and the mounting section are both provided with a second mounting hole, the static arc-guiding section is provided with a second avoiding part, and the front projection of the second avoiding part on the first section covers the second mounting hole.

By adopting the structure, the design of the first mounting hole, the first avoidance hole, the second avoidance part and the second avoidance part is beneficial to the mounting of the contact structure.

In some embodiments of the present application, the mounting section is further provided with a first limiting portion, one end of the first limiting portion is connected to the mounting section, the other end of the first limiting portion abuts against the lower surface of the third section or the other end of the first limiting portion abuts against the lower surface of the third section, and the first limiting portion is located right below the stationary contact or the stationary contact surface.

The design of the first limiting part is beneficial to limiting the third section and reducing the stress deformation degree of the third section.

In some embodiments of the application, the connector board is located below the first section, the connector board is integrated with the first section or the connector board is fixed with the first section and the mounting section.

The design of the patch panel will facilitate external wiring.

In some embodiments of the application, the side of the mounting section extends beyond the second stop.

The design of the second limiting part is beneficial to limiting between the mounting section and the periphery and mounting of the mounting section.

The contactor comprises a base, an upper cover, a top cover, a contact support and a moving contact, wherein the upper cover is arranged on the base, the top cover is arranged on the upper cover, the base and the upper cover form at least one phase of contact arc extinguishing space, the contact support and the contact arc extinguishing space are arranged in a sliding mode, the moving contact is arranged on the contact support and moves synchronously along with the contact support, the moving contact is located in the contact arc extinguishing space, two groups of contact structures are arranged in the contact arc extinguishing space and are respectively arranged on two sides of the moving contact, two groups of arc extinguishing grid plate groups are further arranged in the contact arc extinguishing space and are respectively in one-to-one correspondence with the two groups of contact structures, and a static arc striking section in each group of contact structures extends to the side of one arc extinguishing grid plate in the corresponding arc extinguishing grid plate group.

The contactor adopting the contact structure has better arc striking effect and can improve the performance of products.

In some embodiments of the application, the contact arc extinguishing device further comprises a short-circuit sheet arranged in the contact arc extinguishing space, wherein the short-circuit sheet is used for shorting the two arc extinguishing grid sheet groups, the short-circuit sheet is positioned above the moving contact, and two ends of the short-circuit sheet are short-circuit arc-guiding sections.

The short circuit piece design is more favorable for improving the arc extinguishing effect, and the arc extinguishing grid pieces in the two arc extinguishing grid piece groups are fully utilized.

In some embodiments of the application, the upper cover is provided with two groups of arc extinguishing grid sheet group plugging areas and a short-circuit sheet mounting groove, one of the short-circuit sheet mounting groove and the short-circuit sheet is provided with a positioning part, the other one of the short-circuit sheet mounting groove and the short-circuit sheet is provided with a positioning hole, the positioning part is inserted into the positioning hole to form positioning of the short-circuit sheet, and the top cover is provided with an abutting part abutting on the upper surface of the short-circuit sheet.

The design of the positioning column and the positioning hole is favorable for the installation of the short connecting piece, and the design of the abutting part is favorable for the installation stability of the short connecting piece.

In some embodiments of the application, the movable contact further comprises a reed arranged above the movable contact, the two ends of the movable contact are provided with movable contact arc-guiding sections, the reed is positioned between the two movable contact arc-guiding sections, and the reed is abutted against the upper surface of the movable contact.

The reed can provide the contact medium pressure for the movable contact. The design of the moving contact arc guide section can further improve the arc striking effect and the arc extinguishing performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing a contact structure in a contactor according to embodiment 1 of the present application;

fig. 2 shows a side view of the contact structure in the contactor of embodiment 1 of the application;

Fig. 3 shows a positional relationship diagram of a contact structure, a shorting tab, and an arc extinguishing grid sheet group in the same contact arc extinguishing space in the contactor according to embodiment 1 of the present application;

fig. 4 shows a perspective view of the contactor of embodiment 1 of the present application;

fig. 5 shows a cross-sectional view of the contactor of embodiment 1 of the present application;

Fig. 6 shows an assembled schematic view of the shorting tab in the contactor of embodiment 1 of the application;

Fig. 7 is a schematic view showing the structure of the top cover in the contactor of embodiment 1 of the present application.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "primary," "secondary," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "primary" or "secondary" may include one or more such feature, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a primary feature "up" or "down" a secondary feature may be a direct contact of the primary and secondary features, or an indirect contact of the primary and secondary features through an intervening medium. Moreover, a main feature "above", "over" and "above" a second feature may be that the main feature is directly above or obliquely above the second feature, or simply that the main feature level is higher than the second feature. The main feature "under", "below" and "beneath" the second feature may be the main feature directly under or obliquely under the second feature, or simply indicate that the main feature is electrically connected to a three-phase power source at a higher level than the second feature.

Examples

As shown in fig. 1-7, embodiments of the present application provide a contactor.

The contactor includes a housing structure, a contact assembly, a contact support 200, a return spring, an arc chute assembly 300, a shorting tab 400, and an electromagnetic system.

The housing structure comprises a base 101, a base 102, an upper cover 103 and a top cover 104, wherein the base 102 is positioned on the base 101, the upper cover 103 is positioned on the base 102, and the top cover 104 is positioned 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.

The contact support 200 is slidably disposed with the housing structure so that it can slide downward when the electromagnetic system is energized and then return to its original position by a return spring when the electromagnetic system is de-energized. Of course, this principle is already a conventional technical means in the contactor field, and will not be described here again.

The upper cover 103 and the base 102 form a three-phase contact arc extinguishing space 100a, and the arc extinguishing grid sheet group 300, the contact assembly and the short circuit sheet 400 are all arranged in the contact arc extinguishing space 100 a. Since the arrangement of the arc chute sheet group 300, the contact assembly and the shorting sheet 400 in the three-phase contact arc extinguishing space 100a is substantially the same, one of them is taken as an example.

The contact assembly in each phase of the contact extinguishing space 100a comprises two contact structures and a moving contact 201, wherein the moving contact 201 is fixed on the contact support 200 and moves synchronously with the contact support 200.

The two contact structures are respectively arranged at two sides of the moving contact 201 in a mirror image relationship, and two arc extinguishing grid sheet groups 300 in each phase of contact arc extinguishing space 100a are respectively arranged beside the two contact structures. Taking one of the contact structures and the arc chute sheet set 300 as an example.

The arc extinguishing gate sheet group 300 comprises four arc extinguishing gate sheets, and is inserted into the arc extinguishing gate sheet group insertion area 103a of the upper cover 103.

The contact structure, including the contact structure, includes a contact body 500 and an arc striking member 510.

The contact body 500 includes a first segment 501, a second segment 502, a third segment 503, and a static arc segment 504 that are sequentially connected. Here, the first section 501 is straight, the third section 503 is also straight, and the second section 502 is bent, so that the first section 501 and the third section 503 are arranged in parallel by connecting the second section 502. Here, the upper surface of the third section 503 is provided with a stationary contact 505, where the stationary contact 505 is in contact with the movable contact 202 on the movable contact 201. The static arc-guiding section 504 is inclined, that is, the static arc-guiding section 504 is inclined with respect to the third section 503, and the inclination direction of the static arc-guiding section 504 is inclined in a direction away from the first section 501, that is, gradually approaches the corresponding arc-extinguishing grid set 300. Thus, by the design of the static arc segments 504, the arc will more easily enter the corresponding arc chute assembly 300. In the present embodiment, the stationary contact 505 is provided on the third section 503, and the stationary contact surface (contacting the moving contact 201) may be formed directly on the upper surface of the third section 503 without using the stationary contact 505.

The arc striking member 510 includes a static arc striking section 511, a mounting section 512, a bending section 513, a straight section 514, an auxiliary static arc striking section 515, and a mating section 516, which are sequentially connected. Here, the static striking section 511 and the mounting section 512 are vertically arranged, and the static striking section 511 extends toward the height direction when the static striking section 511 extends, so that the total length of the static striking section 511 exceeds the height of the contact body 500, and the static striking section 511 extends to the side of the arc extinguishing grid sheet set 300 to be beneficial for striking an arc.

The mounting section 512 is adapted to be secured to the first section 501.

A bent section 513 is located at a side of the second section 502. In the present embodiment, the number of the bending sections 513 is two, and the bending sections are disposed on two sides of the second section 502.

A straight section 514 is located on the side of the third section 503. In the present embodiment, the number of straight sections 514 is two, and they are disposed on both sides of the third section 503.

The auxiliary static arc segment 515 is located at the side of the static arc segment 504. In the present embodiment, the number of auxiliary static arc segments 515 is two, and they are disposed on both sides of the static arc segment 504.

Mating segment 516 is provided with a mating protrusion 517, and mating protrusion 517 is inserted into a receptacle 516a on stationary arc segment 511.

That is, in this embodiment, the arc striking member 510 substantially surrounds the second section 502, the third section 503 and the static arc guiding section 504 of the contact body 500, which can improve the arc guiding effect and is beneficial to improving the arc extinguishing performance of the product.

In the present embodiment, the arc striking member 510 and the contact body 500 are fastened by a screw. Of course, in addition to screw fastening, rivet fastening may be used. In order to facilitate fastening by means of screw fastening, rivet fastening, or the like, corresponding mounting holes are also provided in the first section 501 and the mounting section 512. Specifically, the first section 501 and the mounting section 512 are provided with the first mounting hole 5010, the mating section 516 is provided with the first avoiding hole 5160, and the front projection of the first avoiding hole 5160 on the first section 501 covers the first mounting hole 5010, so that the first avoiding hole 5160 can realize the assembly of the first section 501 and the mounting section 512. Second installation holes 5011 are formed in the first section 501 and the installation section 512, second avoidance portions 5040 are formed in the static arc guide section 504, and the second installation holes 5011 are covered by orthographic projections of the second avoidance portions 5040 on the first section 501. The second escape portion 5040 is a through groove, but a through hole may be used. In this way, the second relief 5040 enables the first segment 501 to be assembled with the mounting segment 512.

In order to reduce the stress deformation of the third section 503, a first limiting portion 512a is disposed on the mounting section 512, where the first limiting portion 512a is disposed perpendicular to the mounting section 512, 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. The first limiting portion 512a is located right below the stationary contact 505, so that the third section 503 can be abutted by the first limiting portion 512a even if the third section is deformed by force. Of course, the first stopper portion 512a may be directly disposed so as to abut against the lower surface of the third section 503.

A second limiting portion 512b is further disposed on a side of the mounting section 512, and the second limiting portion 512b can achieve limiting fit with the base 102.

A patch panel 506 is also secured below the first section 501, the patch panel 506 being used to route electrical wiring to facilitate access of the contactor to the desired circuit. The connection board 506, the first section 501 and the mounting section 512 are fastened together by screws, but it is needless to say that the connection board 506 and the first section 501 may be formed as a single piece or the connection board 506 and the first section 501 may be fastened by screws.

In some embodiments of the present application, a patch panel 506 is further included, where patch panel 506 is located below first section 501, where patch panel 506 is integral with first section 501 or where patch panel 506 is secured to first section 501 or where patch panel 506 is secured with first section 501, mounting section 512.

The short circuit piece 400 is of a U-shaped structure, the short circuit piece 400 comprises two short circuit arc leading sections 401 and a body section 402, and the two short circuit arc leading sections 401 are connected through the body section 402. The two short-circuit arc-striking sections 401 of the short-circuit contact piece 400 are each arranged adjacent to two arc-extinguishing gate piece groups 300, so that the arc-striking effect can also be improved by the short-circuit contact piece 400.

The short circuit piece 400 is fixed on the upper cover 103, the short circuit piece mounting groove 103b is arranged on the upper cover 103, the number of the short circuit piece mounting grooves 103b in the arc extinguishing space 100a of the one-phase contact is one, and the short circuit piece mounting grooves are positioned between the two arc extinguishing grid piece group plug-in areas 103 a. Two positioning portions 103b1 are arranged in the short-circuit piece mounting groove 103b, a positioning hole 4020 is formed in the body section 402, the positioning hole 4020 is sleeved on the positioning portion 103b1, an abutting portion 104a corresponding to the body section 402 is arranged on the top cover 104, and the abutting portion 104a abuts against the body section 402. Thus, the fixing of the short tab 400 can be also completed by fixing the top cover 104 to the upper cover 103. In addition, the positioning portion 103b1 may be provided on the short tab 400, and the positioning hole 4020 may be provided in the short tab mounting groove 103b, and the positioning and mounting of the short tab 400 may be performed similarly.

The short contact piece 400 is generally located above the moving contact 201, two ends of the moving contact 201 are moving contact arc guide sections 203, and the arc striking effect can be improved through the moving contact arc guide sections 203. A reed 204 is arranged between the two moving contact arc-shaped sections 203 of the moving contact 201, and the reed 204 is abutted against the upper surface of the moving contact 201, so that contact pressure can be provided for the moving contact 201.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. The contact structure comprises a contact body and an arc striking piece, and is characterized in that the contact body comprises a first section, a second section, a third section and a static arc guiding section which are sequentially connected, the upper surface of the third section is used for setting a static contact or the upper surface of the third section to be a static contact surface, 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 obliquely arranged and is inclined in the direction away from the first section, the arc striking piece comprises a static arc guiding section, a mounting section, a bending section, a straight section, an auxiliary static arc guiding section and a matching section which are sequentially connected, the mounting section is fixed on the upper surface of the first section, one end of the static arc guiding section extends in the height direction to enable the total length of the static arc guiding section to exceed 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 guiding section is located on one side of the static arc guiding section, and the matching section is spliced on the static arc guiding section.

2. The contact structure of claim 1, wherein the number of the bending sections, the straight sections and the auxiliary static arc-guiding sections is two, the two bending sections are respectively positioned at two sides of the second section, the two straight sections are respectively positioned at two sides of the third section, and the two auxiliary static arc-guiding sections are respectively positioned at two sides of the static arc-guiding section.

3. The contact structure of claim 1, wherein the first section and the mounting section are provided with first mounting holes, the matching section is provided with first avoiding holes, the front projection of the first avoiding holes on the first section covers the first mounting holes, and/or the first section and the mounting section are provided with second mounting holes, the static arc guide section is provided with second avoiding parts, and the front projection of the second avoiding parts on the first section covers the second mounting holes.

4. The contact structure of claim 1, wherein the mounting section is further provided with a first limiting portion, one end of the first limiting portion is connected with the mounting section, the other end of the first limiting portion abuts 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 located right below the stationary contact or the stationary contact surface.

5. A contact structure according to any one of claims 1 to 4, further comprising a terminal block located below the first section, the terminal block being integral with the first section or the terminal block being fixed to the first section and the mounting section.

6. A contact structure according to claim 1, wherein the side of the mounting section extends beyond the second stop.

7. The contactor comprises a base, an upper cover, a top cover, a contact support and a moving contact, wherein the upper cover is arranged on the base, the top cover is arranged on the upper cover, the base and the upper cover form at least one phase of contact arc extinguishing space, the contact support and the contact arc extinguishing space are arranged in a sliding mode, the moving contact is arranged in the contact support and moves synchronously along with the contact support, and the moving contact is positioned in the contact arc extinguishing space, and the contactor is characterized in that two groups of contact structures according to any one of claims 1-6 are arranged in the contact arc extinguishing space and are respectively arranged on two sides of the moving contact, two groups of arc extinguishing grid plate groups are further arranged in the contact arc extinguishing space and are respectively in one-to-one correspondence with the two groups of contact structures, and static arc striking sections in each group of contact structures extend to the side of one arc extinguishing grid plate in the corresponding arc extinguishing grid plate group.

8. The contactor of claim 7, further comprising a shorting tab disposed in the arc extinguishing space of the contact, the shorting tab shorting the two arc extinguishing gate groups, the shorting tab being disposed above the moving contact, and the shorting tab having shorting tab segments at opposite ends.

9. The contactor of claim 8, wherein the upper cover is provided with two groups of arc extinguishing grid sheet group plugging areas and a short-circuit sheet mounting groove, one of the short-circuit sheet mounting groove and the short-circuit sheet is provided with a positioning part, the other one of the short-circuit sheet mounting groove and the short-circuit sheet is provided with a positioning hole, the positioning part is inserted into the positioning hole to form positioning of the short-circuit sheet, and the top cover is provided with an abutting part abutting against the upper surface of the short-circuit sheet.

10. The contactor of claim 7, further comprising a spring disposed above the movable contact, wherein the movable contact arc segments are disposed at two ends of the movable contact, the spring is disposed between the two movable contact arc segments, and the spring abuts against an upper surface of the movable contact.