Three-station isolating switch with arc contact

Abstract

The utility model provides a three-position disconnecting switch with an arc contact, which is characterized in that the three-position disconnecting switch comprises a mounting base, a moving contact assembly and a static contact assembly, the moving contact assembly and the static contact assembly are arranged on the mounting base, and a main shaft is rotatably arranged on the mounting base; the moving contact assembly is fixedly connected with the main shaft. The static contact assembly comprises a grounding contact assembly and a main loop contact assembly. The mounting base is also provided with a moving contact seat; the moving contact seat is connected with the moving contact assembly; the moving contact assembly is provided with an anti-bounce device. The anti-bounce device comprises an arc contact; the moving contact seat comprises a seat column; a plurality of arc extinguishing discs are arranged on the peripheral surface of the seat column; the end face of the seat column is connected with the connecting plate through a screw. The connecting plate is rotationally connected relative to the main shaft; the connecting plate is rotationally connected with the moving contact assembly; the three-position disconnecting switch with the arc contact has the advantages of bounce prevention, arc high temperature resistance and convenience in operation.

Description

Technical Field

[0001] This application relates to the field of disconnector technology, and in particular to a three-position disconnector with an arc contact. Background Technology

[0002] A three-position disconnecting switch is a type of switchgear primarily used for isolating power supplies, switching operations, connecting and disconnecting small-current circuits, and effectively grounding. In the open position, the contacts have an insulation distance that meets specified requirements and a clear disconnection mark; in the closed position, it can carry current under normal circuit conditions and abnormal conditions, such as short-circuit current, for a specified time. A key characteristic of disconnecting switches is that they lack arc-extinguishing capability and can only open and close circuits when there is no load current. Because they function as grounding switches, three-position disconnecting switches need to be able to close circuits to ground fault currents and have anti-bounce functionality; however, existing disconnecting switches do not meet these requirements. Summary of the Invention

[0003] The purpose of this application is to provide a three-position disconnect switch with an arc contact to solve the technical problem of the prior art not having an anti-bounce function.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a three-position disconnect switch with an arc contact is provided, including a mounting base and a moving contact assembly and a stationary contact assembly disposed on the mounting base. A main shaft is rotatably disposed on the mounting base; the moving contact assembly is fixedly connected to the main shaft; the stationary contact assembly includes a grounding contact assembly and a main circuit contact assembly; a moving contact seat is also disposed on the mounting base; the moving contact seat is connected to the moving contact assembly; an anti-bounce device is disposed on the moving contact assembly; the anti-bounce device includes an arc contact.

[0005] With the above technical solution, there are three moving contact assemblies and one stationary contact assembly. The stationary contact assembly is fixed and works with the moving contact assembly to achieve grounding or circuit connection. The main shaft is rotated to facilitate the synchronized rotation of the three moving contact assemblies. The grounding contact assembly is connected to the grounding wire to achieve grounding, while the main circuit contact assembly is connected to the circuit. When closing the circuit, a closing bounce will occur. The anti-bounce device can prevent the electric arc generated by the bounce during the closing process and promote the rapid extinguishing of the electric arc, thus facilitating the completion of the grounding and closing task.

[0006] Optionally, the moving contact seat includes a seat post; a plurality of arc-extinguishing discs are provided on the outer circumferential surface of the seat post; the end face of the seat post is connected to a connecting plate by screws; the connecting plate is rotatably connected relative to the main shaft; and the connecting plate is rotatably connected to the moving contact assembly.

[0007] With the above technical solution, a connecting pipe is sleeved on the main shaft between the two waist-shaped plates, and the connecting pipe cooperates with the connecting plate.

[0008] Optionally, the moving contact assembly includes two oppositely arranged waist-shaped plates, and a fixing plate is integrally provided on the opposite surfaces of the two waist-shaped plates; the main shaft passes through the waist-shaped plates and the fixing plate; a mounting plate is provided on the fixing plate, and a spring is also provided to connect the two mounting plates; a fixing shaft is provided between the mounting plates; the fixing shaft movably passes through the mounting plate and is connected to the fixing plate.

[0009] With the above technical solution, three moving contact assemblies are provided. Each moving contact assembly has two oblong plates, that is, two fixed plates. Several springs are provided, and multiple mounting plates can be provided, which are respectively set on the sides of two fixed plates. In this application, two mounting plates are installed on the side of each fixed plate, and four springs are provided. Two springs are provided between every two opposite mounting plates. The diameter of the middle part of the fixed shaft is larger than that of the two ends. Under the tension of the springs, the mounting plates are brought closer together, and the distance between the two opposite mounting plates becomes smaller until it is limited by the fixed shaft. When subjected to external force, that is, after the main circuit contact or grounding contact is inserted between the two mounting plates, the gap is expanded by the main circuit contact or grounding contact to achieve elastic contact.

[0010] Optionally, the mounting plate is provided with a first waist-shaped through hole; the side of the mounting plate away from the spring is provided with a second waist-shaped groove; the first waist-shaped through hole and the second waist-shaped groove form a cross shape; a limit post is also provided located in the second waist-shaped groove, and the end of the spring passes through the first waist-shaped through hole and is connected to the limit post.

[0011] With the above technical solution, under the tension of the spring, the mounting plate moves on the fixed shaft, creating a gap between it and the fixed plate. The first oblong through hole and the second oblong groove can be used to connect and fix the spring.

[0012] Optionally, the mounting plate has arc-shaped snap-fit ​​protrusions on both ends of its sides; the lower end face of the mounting plate is detachably connected to the anti-bounce device; the anti-bounce device includes a connecting base; the connecting base is integrally connected to the arc contact; the arc contact is cylindrical, and the end of the arc contact is spherical; the arc contact is provided with an elastic snap-fit ​​element for anti-bounce.

[0013] With the above technical solution, the snap-fit ​​protrusion is used to snap into the main circuit contact or grounding contact, and the connecting base can be connected to the mounting plate by screws. The connecting base and the arc contact can be connected as a whole or by rotation. The rotation method is a pin-shaft rotation connection. The arc contact is made of copper-tungsten alloy material, which can withstand high temperature and electric arc to prevent damage.

[0014] Optionally, the axis of the arc contact is perpendicular to the axis of the main shaft; the arc contact is provided with a first mounting hole and a second mounting hole; the diameter of the second mounting hole is smaller than that of the first mounting hole; the elastic snap-fit ​​component includes a fixing screw and an abutment post; the abutment post has a limiting ring; the fixing screw is threadedly connected to the first mounting hole; a disc spring is provided in the first mounting hole; the limiting ring is located in the first mounting hole, the abutment post cooperates with the second mounting hole, and the end of the abutment post passes through the second mounting hole and is located outside the arc contact; the disc spring is located between the limiting ring and the fixing screw.

[0015] With the above technical solution, the elastic snap-fit ​​component can elastically abut against the main circuit contact or grounding contact, increasing the friction strength, preventing bounce, and thus preventing the generation of an electric arc. Multiple disc springs can be provided, or they can be set as helical springs.

[0016] Optionally, an H-shaped top plate is provided between the waist-shaped plates and connected to two fixing plates; two top plates are provided, which are connected to the upper and lower edges of the fixing plates by screws; several mounting plates are provided, and the mounting plates are fixed together by screws; the main shaft is insulated; the snap-fit ​​protrusion at one end of the mounting plate abuts against the side of the connecting plate, and the snap-fit ​​protrusion at the other end cooperates with the grounding contact assembly or the main circuit contact assembly.

[0017] With the above technical solution, the top plate is connected to two fixed plates. The H-shaped structure makes it easy to make way when it comes into contact with the main circuit contact or the grounding contact.

[0018] Optionally, the mounting base includes upright plates on both sides; the main shaft is rotatably connected to the upright plates via bearings; the main shaft has a prismatic cross-section; the edge of the upright plates is provided with a first positioning plate, a second positioning plate, and a third positioning plate; the first positioning plate is fixedly connected to the seat column; the second positioning plate is located on the edge of the upright plate above the seat column; the main circuit contact assembly includes main circuit contacts adapted to the number of moving contact assemblies; the second positioning plate is provided with an installation notch; a vertical plate is provided on one side of the installation notch; the end of the main circuit contact is inserted into the installation notch, and the vertical plate is fixedly connected to the main circuit contact by screws.

[0019] Optionally, the grounding contact assembly includes grounding contacts adapted to the number of moving contact assemblies; the end face of the grounding contact abuts against the side of the third positioning plate; the third positioning plate and the grounding contact are fixedly connected by screws.

[0020] With the above technical solution, the positions of the second and third positioning plates relative to the first positioning plate can be set to facilitate the coordination of contacts at different positions when the moving contact assembly rotates, and the connection of the main circuit contacts and grounding contacts to external wires.

[0021] The beneficial effects of this application are as follows: Compared with the prior art, the three-position disconnect switch with arc contact provided by this application has the beneficial effects of anti-bounce, resistance to electric arc and high temperature, and convenient operation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0024] Figure 2 This is a structural schematic diagram from another angle of an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the moving contact assembly according to an embodiment of this application;

[0026] Figure 4 This is a cross-sectional view of the moving contact assembly according to an embodiment of this application;

[0027] Figure 5 This is a structural schematic diagram of the moving contact assembly according to an embodiment of this application (showing one of the existing waist-shaped plates and fixing plates);

[0028] Figure 6 This is a schematic diagram of the anti-bounce device structure according to an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the mounting plate in an embodiment of this application.

[0030] The reference numerals in the figures are as follows: 1. Main shaft; 2. Arc contact; 3. Seat column; 4. Arc extinguishing disc; 5. Connecting plate; 6. Connecting pipe; 7. Waist-shaped plate; 8. Fixing plate; 9. Mounting plate; 10. Spring; 11. Fixing shaft; 12. First waist-shaped through hole; 13. Second waist-shaped groove; 14. Snap-fit ​​protrusion; 15. Connecting base; 16. Fixing screw; 17. Abutment column; 18. Limiting ring; 19. Disc spring; 20. Top plate; 21. Vertical plate; 22. First positioning plate; 23. Second positioning plate; 24. Third positioning plate; 25. Mounting notch; 26. Vertical plate; 27. Grounding contact; 28. Main circuit contact. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" means two or more, unless otherwise explicitly specified.

[0035] like Figures 1 to 7 As shown, the purpose of this application embodiment is to provide a three-position disconnect switch with an arc contact 2 to solve the technical problem of the prior art not having an anti-bounce function.

[0036] To achieve the above objectives, the technical solution adopted in this application is as follows: a three-position disconnecting switch with an arc contact 2 is provided, including a mounting base and a moving contact assembly and a stationary contact assembly disposed on the mounting base. A main shaft 1 is rotatably disposed on the mounting base; the moving contact assembly is fixedly connected to the main shaft 1; the stationary contact assembly includes a grounding contact 27 assembly and a main circuit contact 28 assembly; a moving contact seat is also disposed on the mounting base; the moving contact seat is connected to the moving contact assembly; an anti-bounce device is disposed on the moving contact assembly; the anti-bounce device includes the arc contact 2.

[0037] With the above technical solution, there are three moving contact components and one stationary contact component. The stationary contact component is fixed and works with the moving contact component to achieve grounding or circuit connection. The main shaft 1 is rotatable to facilitate the synchronized rotation of the three moving contact components. The grounding contact component 27 is grounded and connected to the grounding wire, while the main circuit contact component 28 is connected to the circuit. When closing the circuit, a closing bounce will occur. The anti-bounce device can prevent the arc generated by the bounce during the closing process and promote the rapid extinguishing of the arc, thus facilitating the completion of the grounding and closing task.

[0038] Optionally, the moving contact seat includes a seat post 3; a plurality of arc-extinguishing disks 4 are provided on the outer circumferential surface of the seat post 3; the end face of the seat post 3 is connected to the connecting plate 5 by screws; the connecting plate 5 is rotatably connected relative to the main shaft 1; the connecting plate 5 is rotatably connected to the moving contact assembly.

[0039] With the above technical solution, a connecting pipe 6 is sleeved on the main shaft 1 between the two waist-shaped plates 7, and the connecting pipe 6 cooperates with the connecting plate 5.

[0040] Optionally, the moving contact assembly includes two oppositely arranged waist-shaped plates 7, and a fixing plate 8 is integrally provided on the opposite surfaces of the two waist-shaped plates 7; the main shaft 1 passes through the waist-shaped plates 7 and the fixing plate 8; a mounting plate 9 is provided on the fixing plate 8, and a spring 10 is also provided to connect the two mounting plates 9; a fixing shaft 11 is provided between the mounting plates 9; the fixing shaft 11 movably passes through the mounting plate 9 and is connected to the fixing plate 8.

[0041] With the above technical solution, three moving contact assemblies are provided. Each moving contact assembly has two waist-shaped plates 7, that is, two fixed plates 8. Several springs 10 are provided, and multiple mounting plates 9 can be provided, which are respectively set on the sides of two fixed plates 8. In this application, two mounting plates 9 are installed on the side of each fixed plate 8, and four springs 10 are provided. Two springs 10 are provided between every two opposite mounting plates 9. The diameter of the middle part of the fixed shaft 11 is larger than that of both ends. Under the tension of the springs 10, the mounting plates 9 move closer together, and the distance between two opposite mounting plates 9 becomes smaller until it is limited by the fixed shaft 11. When subjected to external force, that is, after the main circuit contact 28 or the grounding contact 27 is inserted between the two mounting plates 9, the gap is expanded by the main circuit contact 28 or the grounding contact 27 to achieve elastic contact.

[0042] Optionally, the mounting plate 9 is provided with a first waist-shaped through hole 12; the side of the mounting plate 9 facing away from the spring 10 is provided with a second waist-shaped groove 13; the first waist-shaped through hole 12 and the second waist-shaped groove 13 form a cross shape; a limiting post is also provided located in the second waist-shaped groove 13, and the end of the spring 10 passes through the first waist-shaped through hole 12 and is connected to the limiting post.

[0043] With the above technical solution, under the tension of the spring 10, the mounting plate 9 moves on the fixed shaft 11, creating a gap between it and the fixed plate 8. The first waist-shaped through hole 12 and the second waist-shaped groove 13 can be used to connect and fix the spring 10.

[0044] Optionally, the mounting plate 9 has arc-shaped snap-fit ​​protrusions 14 on both sides; the lower end face of the mounting plate 9 is detachably connected to the anti-bounce device; the anti-bounce device includes a connecting base 15; the connecting base 15 is integrally connected to the arc contact 2; the arc contact 2 is cylindrical, and the end of the arc contact 2 is spherical; the arc contact 2 is provided with an elastic snap-fit ​​element for anti-bounce.

[0045] With the above technical solution, the snap-fit ​​protrusion 14 is used to snap with the main circuit contact 28 or the grounding contact 27, and the connecting base 15 can be connected to the mounting plate 9 by screws. The connecting base 15 and the arc contact 2 can be connected as a whole or by rotation. The rotation method is a pin shaft rotation connection. The arc contact 2 is made of copper-tungsten alloy material, which can withstand high temperature and electric arc and prevent damage.

[0046] Optionally, the axis of the arc contact 2 is perpendicular to the axis of the main shaft 1; the arc contact 2 is provided with a first mounting hole and a second mounting hole; the diameter of the second mounting hole is smaller than that of the first mounting hole; the elastic snap-fit ​​component includes a fixing screw 16 and an abutment post 17; the abutment post 17 has a limiting ring 18; the fixing screw 16 is threadedly connected to the first mounting hole; a disc spring 19 is provided in the first mounting hole; the limiting ring 18 is located in the first mounting hole, the abutment post 17 cooperates with the second mounting hole, and the end of the abutment post 17 passes through the second mounting hole and is located outside the arc contact 2; the disc spring 19 is located between the limiting ring 18 and the fixing screw 16.

[0047] With the above technical solution, the elastic snap-fit ​​component can elastically abut against the main circuit contact 28 or the grounding contact 27, increasing the friction strength and preventing bounce, which could lead to the generation of an electric arc. Multiple disc springs 19 can also be configured as helical springs.

[0048] Optionally, an H-shaped top plate 20 is provided between the waist-shaped plates 7 and connected to two fixing plates 8; two top plates 20 are provided, which are connected to the upper and lower edges of the fixing plates 8 by screws respectively; several mounting plates 9 are provided, and the mounting plates 9 are fixed together by screws; the main shaft 1 is insulated; the snap-fit ​​protrusion 14 at one end of the mounting plate 9 abuts against the side of the connecting plate 5, and the snap-fit ​​protrusion 14 at the other end cooperates with the grounding contact 27 assembly or the main circuit contact 28 assembly.

[0049] With the above technical solution, the top plate 20 is connected to two fixed plates 8. The H-shaped structure makes it easy to make way when it comes into contact with the main circuit contact 28 or the grounding contact 27.

[0050] Optionally, the mounting base includes upright plates 21 located on both sides; the main shaft 1 is rotatably connected to the upright plates 21 via bearings; the cross-section of the main shaft 1 is set to a rhombus shape; the edge of the upright plates 21 is provided with a first positioning plate 22, a second positioning plate 23, and a third positioning plate 24; the first positioning plate 22 is fixedly connected to the seat column 3; the second positioning plate 23 is located on the edge of the upright plates 21 above the seat column 3; the main circuit contact 28 assembly includes main circuit contacts 28 adapted to the number of moving contact assemblies; the second positioning plate 23 is provided with a mounting notch 25; a vertical plate 26 is provided on one side of the mounting notch 25; the end of the main circuit contact 28 is inserted into the mounting notch 25, and the vertical plate 26 is fixedly connected to the main circuit contact 28 by screws.

[0051] Optionally, the grounding contact 27 assembly includes grounding contacts 27 adapted to the number of moving contact assemblies; the end face of the grounding contact 27 abuts against the side of the third positioning plate 24; the third positioning plate 24 and the grounding contact 27 are fixedly connected by screws.

[0052] With the above technical solution, the positions of the second positioning plate 23 and the third positioning plate 24 relative to the first positioning plate 22 can be set so that the contacts at different positions can be coordinated when the moving contact assembly rotates, and the main circuit contact 28 and the grounding contact 27 can be connected to the external wires.

[0053] The beneficial effects of this application are as follows: Compared with the prior art, the three-position disconnect switch with arc contact 2 provided by this application has the beneficial effects of anti-bounce, resistance to electric arc and high temperature, and convenient operation.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in detail for the sake of brevity.

[0055] This application is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A three-position disconnector with an arc contact, comprising a mounting base and a moving contact assembly and a stationary contact assembly disposed on the mounting base, characterized in that: A main shaft (1) is rotatably mounted on the mounting base; the moving contact assembly is fixedly connected to the main shaft (1); the stationary contact assembly includes a grounding contact (27) assembly and a main circuit contact (28) assembly; a moving contact seat is also provided on the mounting base; the moving contact seat is connected to the moving contact assembly; an anti-bounce device is provided on the moving contact assembly; the anti-bounce device includes an arc contact (2).

2. The three-position disconnector with an arc contact according to claim 1, characterized in that: The moving contact seat includes a seat post (3); a plurality of arc-extinguishing discs (4) are provided on the outer circumferential surface of the seat post (3); the end face of the seat post (3) is connected to the connecting plate (5) by screws; the connecting plate (5) is rotatably connected relative to the main shaft (1); the connecting plate (5) is rotatably connected to the moving contact assembly.

3. The three-position disconnector with an arc contact according to claim 1, characterized in that: The moving contact assembly includes two oppositely arranged waist-shaped plates (7), and a fixing plate (8) is integrally provided on the opposite surfaces of the two waist-shaped plates (7); the main shaft (1) passes through the waist-shaped plates (7) and the fixing plate (8); a mounting plate (9) is provided on the fixing plate (8), and a spring (10) is also provided to connect the two mounting plates (9); a fixing shaft (11) is provided between the mounting plates (9); the fixing shaft (11) moves through the mounting plate (9) and connects with the fixing plate (8).

4. The three-position disconnector with an arc contact according to claim 3, characterized in that: The mounting plate (9) is provided with a first waist-shaped through hole (12); the side of the mounting plate (9) away from the spring (10) is provided with a second waist-shaped groove (13); the first waist-shaped through hole (12) and the second waist-shaped groove (13) are in a cross shape; a limit post is also provided located in the second waist-shaped groove (13), and the end of the spring (10) passes through the first waist-shaped through hole (12) and is connected to the limit post.

5. The three-position disconnector with an arc contact according to claim 4, characterized in that: The mounting plate (9) has arc-shaped snap-fit ​​protrusions (14) on both sides; the lower end face of the mounting plate (9) is detachably connected to the anti-bounce device; the anti-bounce device includes a connecting base (15); the connecting base (15) is integrally connected to the arc contact (2); the arc contact (2) is cylindrical and the end of the arc contact (2) is spherical; the arc contact (2) is provided with an elastic snap-fit ​​for anti-bounce.

6. The three-position disconnector with an arc contact according to claim 5, characterized in that: The axis of the arc contact (2) is perpendicular to the axis of the main shaft (1); the arc contact (2) is provided with a first mounting hole and a second mounting hole; the diameter of the second mounting hole is smaller than that of the first mounting hole; the elastic snap-fit ​​component includes a fixing screw (16) and an abutment post (17); the abutment post (17) has a limiting ring (18); the fixing screw (16) is threadedly connected to the first mounting hole; a disc spring (19) is provided in the first mounting hole; the limiting ring (18) is located in the first mounting hole, the abutment post (17) cooperates with the second mounting hole, and the end of the abutment post (17) passes through the second mounting hole and is located outside the arc contact (2); the disc spring (19) is located between the limiting ring (18) and the fixing screw (16).

7. The three-position disconnector with an arc contact according to claim 6, characterized in that: An H-shaped top plate (20) is provided between the waist-shaped plates (7) and connected to two fixing plates (8); two top plates (20) are provided, which are connected to the upper and lower edges of the fixing plates (8) by screws respectively; several mounting plates (9) are provided, and the mounting plates (9) are fixed to each other by screws; the main shaft (1) is insulated; the snap-fit ​​protrusion (14) at one end of the mounting plate (9) abuts against the side of the connecting plate (5), and the snap-fit ​​protrusion (14) at the other end cooperates with the grounding contact (27) assembly or the main circuit contact (28) assembly.

8. The three-position disconnector with an arc contact according to claim 2, characterized in that: The mounting base includes upright plates (21) on both sides; the main shaft (1) is rotatably connected to the upright plates (21) via bearings; the cross section of the main shaft (1) is set as a rhombus; the edge of the upright plate (21) is provided with a first positioning plate (22), a second positioning plate (23), and a third positioning plate (24); the first positioning plate (22) is fixedly connected to the seat column (3); the second positioning plate (23) is located on the edge of the upright plate (21) above the seat column (3); the main circuit contact (28) assembly includes main circuit contacts (28) adapted to the number of moving contact assemblies; the second positioning plate (23) is provided with an installation notch (25); a vertical plate (26) is provided on one side of the installation notch (25); the end of the main circuit contact (28) is inserted into the installation notch (25), and the vertical plate (26) is fixedly connected to the main circuit contact (28) by screws.

9. The three-position disconnector with an arc contact according to claim 1 or 8, characterized in that: The grounding contact (27) assembly includes grounding contacts (27) of a number adapted to the number of moving contact assemblies; the end face of the grounding contact (27) abuts against the side of the third positioning plate (24); the third positioning plate (24) and the grounding contact (27) are fixedly connected by screws.

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