Three-loop high-voltage contactor with normally open or normally closed auxiliary contacts

Abstract

The invention discloses a three-loop high-voltage contactor with normally-open or normally-closed auxiliary contacts, and relates to the technical field of high-voltage contactors, an auxiliary movable contact spring in an auxiliary loop is arranged in the middle of a fixed support, and an auxiliary terminal outgoing line and a wire are jointly led out from the middle of a product; a brand-new high-voltage contactor internal structure frame is shown, the requirements of line and signal export of a user are met, installation and use are convenient, and the technical problem that the lead mode in an existing high-voltage contactor is limited is solved. A static contact, a first movable contact piece and a second movable contact piece are arranged, the static contact comprises a first main contact, a second main contact, a third main contact and a fourth main contact, and the first main contact and the second main contact correspond to the first movable contact piece to form a first main loop; and the third main contact and the fourth main contact are arranged corresponding to the first movable contact piece to form a second main loop, so that the product is provided with two main loops at the same time to realize switching of a main current load loop.

Description

Technical Field

[0001] This invention relates to the field of high-voltage contactor technology, and more particularly to a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts. Background Technology

[0002] High-voltage DC contactors, as core control components in power systems, primarily function to control the on / off switching and circuit switching of high-voltage circuits. They are indispensable key components in the new energy industry and high-voltage circuit control field. With the rapid development of the new energy industry, the performance and functional requirements of high-voltage DC contactors in fields such as photovoltaics, energy storage, and new energy vehicles are constantly increasing. Traditional single-current main circuit high-voltage DC contactors can no longer meet the diverse application needs of these industries.

[0003] Currently, most existing high-voltage DC contactors adopt a single main circuit structure, which can only realize the on / off control of a single main current load and cannot meet the needs of some customers for dual main circuit switching. At the same time, in order to monitor the on or off status of the main circuit, some application scenarios require the configuration of an independent auxiliary circuit. However, the auxiliary circuit structure design of existing products has obvious defects: First, the lead-out method of the auxiliary circuit is limited. The auxiliary circuit of conventional products is connected to the external circuit through the lead-out line in the upper area, which has poor wiring flexibility and cannot adapt to the compact equipment installation space. Second, the closing method of the auxiliary circuit is singular and cannot switch between normally open and normally closed modes according to the customer's operating conditions. Some customers need the auxiliary circuit to conduct synchronously when the dual main circuits are conducting, while others need the auxiliary circuit to be disconnected synchronously when the dual main circuits are conducting. Traditional products cannot meet these differentiated needs at the same time. Third, the component assembly structure of the auxiliary circuit has insufficient stability, and the contact pressure and current-cutting capacity are limited, which affects the stability of the monitoring signal.

[0004] To solve the aforementioned technical problems, there is an urgent need for a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts, solving the technical defects of existing high-voltage contactors such as single main circuit function, non-switchable auxiliary circuit closing mode, and limited lead wire method.

[0006] This invention proposes a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts, including a stationary contact, a first moving contact, and a second moving contact. The stationary contact includes a first main contact, a second main contact, a third main contact, and a fourth main contact. The first main contact and the second main contact are correspondingly arranged with the first moving contact to form a first main circuit. The third main contact and the fourth main contact are correspondingly arranged with the first moving contact to form a second main circuit.

[0007] A ceramic cover assembly is provided on the outside of the stationary contact, the ceramic cover assembly including a ceramic cover; the stationary contact is fixedly installed on the top of the ceramic cover.

[0008] A square frame is fixedly installed below the ceramic cover assembly, and a yoke plate assembly is fixedly installed below the square frame. The yoke plate assembly includes a yoke plate, and a first fixing member, a second fixing member, a third fixing member, and a fourth fixing member are fixedly installed at both ends of the yoke plate along its length. The yoke plate is fixed by the first fixing member, the second fixing member, the third fixing member, and the fourth fixing member.

[0009] A sealing assembly is installed inside the ceramic cover assembly. The sealing assembly includes a first movable contact piece and a second movable contact piece. A contact spring is fixedly installed below the first movable contact piece and the second movable contact piece. A fixing bracket is fixedly installed below the contact spring. A fixing plate is fixedly installed above the fixing bracket. The first movable contact piece and the second movable contact piece are fixed above the fixing bracket by the fixing plate.

[0010] An auxiliary movable spring is fixedly installed at the middle of the fixed bracket along its length, and a mounting component is fixedly installed at the top center of the auxiliary movable spring.

[0011] A U-shaped yoke is mounted on the yoke plate, and a guide sleeve is mounted on the bottom of the U-shaped yoke. A yoke ring is mounted on the end of the guide sleeve near the yoke plate. An indicator core is mounted axially on the guide sleeve, and a color sleeve is mounted on the end of the indicator core away from the yoke plate. An indicator spring is installed between the indicator core and the guide sleeve.

[0012] A stationary iron core is fixedly installed below the yoke plate, and a moving iron core is installed below the stationary iron core. A return spring is installed between the stationary iron core and the moving iron core. A push rod is axially installed between the stationary iron core and the moving iron core. A magnetic ring is installed below the moving iron core. The position of the indicator iron core is controlled by the magnetic ring, thereby displaying the status of the moving iron core and achieving the indication effect.

[0013] A magnetic guide cylinder is installed on the outside of the moving iron core and the stationary iron core. The magnetic guide cylinder is fixedly installed below the yoke plate. A coil frame is fixedly installed on the outside of the magnetic guide cylinder. An inner ring of enameled wire is fixedly installed on the side of the coil frame away from the magnetic guide cylinder. A coil winding is fixedly installed on the side of the inner ring of enameled wire away from the magnetic guide cylinder.

[0014] The yoke plate is equipped with centrally symmetrically distributed auxiliary terminals, which are installed through the yoke plate. The auxiliary terminals are correspondingly arranged at both ends of the auxiliary moving spring. The auxiliary terminals are configured as "L"-shaped, with one end located above the auxiliary moving spring and the other end extending to the outside of the ceramic cover assembly.

[0015] A circuit board is installed at one end of the coil frame near the U-shaped yoke, and a wire is connected to the end of the circuit board away from the magnetic cylinder. The circuit board is connected to an external power source through the wire.

[0016] In a preferred embodiment of the present invention, the end of the auxiliary terminal away from the auxiliary moving spring is connected to an auxiliary terminal lead wire; the auxiliary terminal transmits signals to the outside world through the auxiliary terminal lead wire.

[0017] In a preferred embodiment of the present invention, the auxiliary terminal is provided with a bent portion at one end near the auxiliary moving spring. The bent portion opens upward and is U-shaped to achieve stable contact between the auxiliary terminal and the auxiliary moving spring.

[0018] In a preferred embodiment of the present invention, an array of second reinforcing ribs are fixedly installed on the top of the fixed bracket, which improves the strength of the fixed bracket and ensures the insulation between the auxiliary circuit and the main circuit.

[0019] In a preferred embodiment of the present invention, a first isolation plate and a second isolation plate are fixedly installed on the top of the ceramic cover. The first isolation plate is disposed at the center of the width direction of the ceramic cover and is used to isolate the first main contact and the second main contact, as well as the third main contact and the fourth main contact. The second isolation plate is disposed at the center of the length direction of the ceramic cover and is used to isolate the second main contact and the third main contact, as well as the first main contact and the fourth main contact. A plurality of first reinforcing ribs are fixedly installed between the first isolation plate and the second isolation plate.

[0020] In a preferred embodiment of the present invention, a shielding plate is installed at one end of the U-shaped yoke in the width direction to prevent electromagnetic interference. By setting a dedicated electromagnetic shielding structure, electromagnetic waves are prevented from easily interfering with the circuit board of the contactor, thus ensuring the accuracy of circuit control and status monitoring. A label is fixedly installed at the end of the shielding plate away from the U-shaped yoke.

[0021] In a preferred embodiment of the present invention, an exhaust pipe is also installed on the yoke plate.

[0022] In a preferred embodiment of the present invention, different colors can be set on the color cover.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] 1. The three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts presented in this invention, by placing the auxiliary moving spring in the middle of the fixed bracket in the auxiliary circuit, and having the auxiliary terminal lead and the main wire jointly led out from the middle of the product, demonstrates a completely new internal structural framework for high-voltage contactors. This meets the user's needs for line and signal output, facilitates installation and use, and solves the technical problem of limited lead-out methods in existing high-voltage contactors. By setting a stationary contact, a first moving contact, and a second moving contact, the stationary contact includes a first main contact, a second main contact, a third main contact, and a fourth main contact. The first and second main contacts are correspondingly arranged with the first moving contact to form a first main circuit; the third and fourth main contacts are correspondingly arranged with the first moving contact to form a second main circuit, thus enabling the product to simultaneously have two main circuits for switching the main current load circuit.

[0025] 2. The three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts shown in this invention features auxiliary terminals symmetrically distributed on the yoke plate. These auxiliary terminals correspond to the two ends of the auxiliary moving spring. The auxiliary terminals are L-shaped, with a bent portion at the end closest to the auxiliary moving spring. This bent portion opens upwards in a U-shape, achieving stable contact between the auxiliary terminals and the auxiliary moving spring. This satisfies the requirement for the auxiliary terminals to monitor the stable state of the main circuit, increases contact pressure, and improves current-cutting capacity.

[0026] 3. The three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts shown in this invention can be adjusted by changing the state of the auxiliary moving spring and the auxiliary terminal. When the dual main circuits are turned on or off, the auxiliary circuit is turned on or off synchronously; or when the dual main circuits are turned on, the auxiliary circuit is turned off synchronously, and when the dual main circuits are turned off, the auxiliary circuit is turned on synchronously. This realizes a brand-new structure of a three-circuit high-voltage contactor with dual main circuits and auxiliary circuits, meeting the usage requirements of normally open or normally closed auxiliary contacts and satisfying the needs of customers under various working conditions.

[0027] 4. The three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts shown in this invention has multiple colors on the color sleeve. Users can easily judge different states by looking at different colors when the product is in the on and off state. This provides users with intuitive visual indications, and operators can quickly judge the working status of the contactor, reducing the difficulty of equipment inspection and maintenance. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts according to the present invention;

[0029] Figure 2 This is a front view schematic diagram of a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts according to the present invention;

[0030] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure;

[0031] Figure 4 This is a right-side structural schematic diagram of a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts according to the present invention;

[0032] Figure 5 This is a three-dimensional structural schematic diagram of the sealing assembly of a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts according to the present invention.

[0033] Figure 6 for Figure 5 A magnified view of the structure at point A above;

[0034] Figure 7 This is a three-dimensional structural diagram of the magnetic circuit assembly in a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts according to the present invention.

[0035] Figure 8 This is a three-dimensional structural diagram of the U-shaped yoke and magnetic cylinder in a three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts according to the present invention.

[0036] In the diagram: 1. Ceramic cover assembly; 11. First isolation plate; 12. First reinforcing rib; 13. Second isolation plate; 14. Ceramic cover; 2. Stationary contact; 21. First main contact; 22. Second main contact; 23. Third main contact; 24. Fourth main contact; 3. Yoke plate assembly; 31. First fixing member; 32. Second fixing member; 33. Third fixing member; 34. Fourth fixing member; 35. Auxiliary terminal; 351. Bending part; 36. Exhaust pipe; 37. Yoke plate; 4. Sealing assembly; 41. First moving contact piece; 42. Second moving contact piece; 43. Fixing plate; 44. 45. Fixed bracket; 46. Contact spring; 47. Second reinforcing rib; 48. Auxiliary moving spring; 49. Mounting part; 5. Square frame piece; 60. U-shaped yoke; 61. Color sleeve; 62. Indicator core; 63. Yoke ring; 64. Guide sleeve; 65. Indicator spring; 66. Return spring; 67. Moving core; 68. Magnetic ring; 69. Stationary core; 70. Push rod; 71. Magnetic circuit assembly; 72. Wire; 73. Circuit board; 74. Auxiliary terminal lead wire; 75. Coil frame; 76. Coil winding; 77. Inner ring enameled wire; 88. Magnetic guide cylinder; 9. Shielding plate; 10. Label. Detailed Implementation

[0037] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0038] Example 1:

[0039] A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts, such as Figures 1-8 As shown, the device includes a stationary contact 2, a first moving contact piece 41, and a second moving contact piece 42. The stationary contact 2 includes a first main contact 21, a second main contact 22, a third main contact 23, and a fourth main contact 24. The first main contact 21 and the second main contact 22 are correspondingly arranged with the first moving contact piece 41 to form a first main circuit. The third main contact 23 and the fourth main contact 24 are correspondingly arranged with the first moving contact piece 41 to form a second main circuit. This allows the product to have two main circuits simultaneously for switching the main current load circuit.

[0040] like Figure 1 As shown, a ceramic cover assembly 1 is provided on the outer side of the stationary contact 2, and the ceramic cover assembly 1 includes a ceramic cover 14; the stationary contact 2 is fixedly installed on the top of the ceramic cover 14.

[0041] like Figure 3As shown, a square frame piece 5 is fixedly installed below the ceramic cover assembly 1, and a yoke plate assembly 3 is fixedly installed below the square frame piece 5.

[0042] like Figure 5 As shown, the yoke plate assembly 3 includes a yoke plate 37, on which an exhaust pipe 36 is installed; a first fixing member 31, a second fixing member 32, a third fixing member 33 and a fourth fixing member 34 are fixedly installed at both ends of the yoke plate 37 along its length direction, and the yoke plate 37 is fixed by the first fixing member 31, the second fixing member 32, the third fixing member 33 and the fourth fixing member 34.

[0043] like Figures 5-6 As shown, a sealing assembly 4 is installed inside the ceramic cover assembly 1. The sealing assembly 4 includes a first movable contact piece 41 and a second movable contact piece 42. A contact spring 45 is fixedly installed below the first movable contact piece 41 and the second movable contact piece 42. A fixing bracket 44 is fixedly installed below the contact spring 45. A fixing plate 43 is fixedly installed above the fixing bracket 44. The first movable contact piece 41 and the second movable contact piece 42 are fixed above the fixing bracket 44 by the fixing plate 43.

[0044] like Figure 6 As shown, an auxiliary movable spring 47 is fixedly installed at the middle of the fixed bracket 44 along its length, and an installation piece 471 is fixedly installed at the top center of the auxiliary movable spring 47.

[0045] like Figure 3 as well as Figure 8 As shown, a U-shaped yoke 6 is installed on the yoke plate 37, a guide sleeve 64 is installed at the bottom of the U-shaped yoke 6, and a yoke ring 63 is installed at one end of the guide sleeve 64 near the yoke plate 37; an indicator core 62 is axially installed on the guide sleeve 64, a color sleeve 61 is installed at one end of the indicator core 62 away from the yoke plate 37, and an indicator spring 65 is installed between the indicator core 62 and the guide sleeve 64.

[0046] like Figure 3 As shown, a stationary iron core 68 is fixedly installed below the yoke plate 37, and a moving iron core 67 is installed below the stationary iron core 68. A return spring 66 is installed between the stationary iron core 68 and the moving iron core 67. A push rod 69 is axially installed between the stationary iron core 68 and the moving iron core 67. A magnetic ring 671 is installed below the moving iron core 67. The position of the indicator iron core 62 is controlled by the magnetic ring 671, thereby displaying the state of the moving iron core 67 and achieving the indication effect.

[0047] like Figure 3 as well as Figure 7As shown, a magnetic guide cylinder 77 is installed on the outside of the moving iron core 67 and the stationary iron core 68. The magnetic guide cylinder 77 is fixedly installed below the yoke plate 37. A coil frame 74 is fixedly installed on the outside of the magnetic guide cylinder 77. An inner ring enameled wire 76 is fixedly installed on the side of the coil frame 74 away from the magnetic guide cylinder 77. A coil winding 75 is fixedly installed on the side of the inner ring enameled wire 76 away from the magnetic guide cylinder 77.

[0048] like Figure 5 As shown, auxiliary terminals 35 are centrally symmetrically distributed on the yoke plate 37, and the auxiliary terminals 35 are installed through the yoke plate 37. The auxiliary terminals 35 are correspondingly arranged at both ends of the auxiliary moving spring 47. The auxiliary terminals 35 are set in an "L" shape, with one end located above the auxiliary moving spring 47 and the other end extending to the outside of the ceramic cover assembly 1. This device can be adjusted so that when the dual main circuit is turned on or off, the auxiliary circuit is turned on or off synchronously; or when the dual main circuit is turned on, the auxiliary circuit is turned off synchronously, and when the dual main circuit is turned off, the auxiliary circuit is turned on synchronously. This realizes a new structure of a three-circuit high-voltage contactor with dual main circuits and auxiliary circuits, which meets the usage requirements of normally open or normally closed auxiliary contacts and meets the needs of customers under various working conditions.

[0049] like Figure 2 as well as Figure 7 As shown, a circuit board 72 is mounted on one end of the coil frame 74 near the U-shaped yoke 6. A wire 71 is connected to the end of the circuit board 72 away from the magnetic cylinder 77. The circuit board 72 is connected to an external power source through the wire 71. An auxiliary terminal lead 73 is connected to the end of the auxiliary terminal 35 away from the auxiliary moving spring 47. The auxiliary terminal 35 transmits signals to the outside through the auxiliary terminal lead 73. By placing the auxiliary moving spring 47 in the middle of the fixed bracket 44 in the auxiliary circuit, and having the auxiliary terminal lead 73 and the wire 71 lead out from the middle of the product together, a brand-new internal structural framework for high-voltage contactors is demonstrated. This meets the user's needs for circuit and signal output, facilitates installation and use, and solves the technical problem of limited lead methods in existing high-voltage contactors.

[0050] like Figure 6 As shown, the auxiliary terminal 35 has a bent portion 351 at one end near the auxiliary moving spring 47. The bent portion 351 opens upward and is U-shaped to achieve stable contact between the auxiliary terminal 35 and the auxiliary moving spring 47, which satisfies the stable state of the auxiliary terminal monitoring the main circuit, can increase the contact pressure, and is beneficial to improve the current interception capacity.

[0051] like Figure 6As shown, the top of the fixed bracket 44 is fixedly equipped with an array of second reinforcing ribs 46, which improves the strength of the fixed bracket 44 on the one hand, and ensures the insulation between the auxiliary circuit and the main circuit on the other hand.

[0052] like Figure 1 As shown, a first isolation plate 11 and a second isolation plate 13 are fixedly installed on the top of the ceramic cover 14. The first isolation plate 11 is located at the center of the width direction of the ceramic cover 14 and is used to isolate the first main contact 21 and the second main contact 22, as well as the third main contact 23 and the fourth main contact 24. The second isolation plate 13 is located at the center of the length direction of the ceramic cover 14 and is used to isolate the second main contact 22 and the third main contact 23, as well as the first main contact 21 and the fourth main contact 24. To ensure insulation between the several stationary contacts, several first reinforcing ribs 12 are fixedly installed between the first isolation plate 11 and the second isolation plate 13 to increase strength and prevent deformation.

[0053] like Figure 2 As shown, a shielding plate 8 is installed at one end of the U-shaped yoke 6 in the width direction to prevent electromagnetic interference; a label 9 is fixedly installed at the end of the shielding plate 8 away from the U-shaped yoke 6.

[0054] like Figure 3 As shown, since the color sleeve 61 moves with the movement of the indicator core 62, different colors can be set at different positions of the color sleeve 61. The position of the indicator core 62 can be indicated by different colors, and the on and off states of the product can be deduced by the position of the indicator core 62. Users can easily judge different states by looking at different colors, which provides users with intuitive visual indication. Operators can quickly judge the working status of the contactor, reducing the difficulty of equipment inspection and maintenance.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts, characterized in that, The device includes a stationary contact (2), a first moving contact piece (41), and a second moving contact piece (42). The stationary contact (2) includes a first main contact (21), a second main contact (22), a third main contact (23), and a fourth main contact (24). The first main contact (21) and the second main contact (22) are configured correspondingly to the first moving contact piece (41) to form a first main circuit. The third main contact (23) and the fourth main contact (24) are configured correspondingly to the first moving contact piece (41) to form a second main circuit.

2. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 1, characterized in that: A ceramic cover assembly (1) is provided on the outside of the stationary contact (2), and a square frame piece (5) is fixedly installed below the ceramic cover assembly (1). A yoke plate assembly (3) is fixedly installed below the square frame piece (5); the yoke plate assembly (3) includes a yoke plate (37).

3. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 1, characterized in that: The ceramic cover assembly (1) is equipped with a sealing assembly (4), which includes a first movable contact piece (41) and a second movable contact piece (42). A contact spring (45) is fixedly installed below the first movable contact piece (41) and the second movable contact piece (42). A fixing bracket (44) is fixedly installed below the contact spring (45). A fixing plate (43) is fixedly installed above the fixing bracket (44). The first movable contact piece (41) and the second movable contact piece (42) are fixed above the fixing bracket (44) by the fixing plate (43).

4. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 3, characterized in that: An auxiliary moving spring (47) is fixedly installed at the middle of the length direction of the fixed bracket (44), and an installation part (471) is fixedly installed at the top center of the auxiliary moving spring (47).

5. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 2, characterized in that: A U-shaped yoke (6) is installed on the yoke plate (37). A guide sleeve (64) is installed at the bottom of the U-shaped yoke (6). A yoke ring (63) is installed at one end of the guide sleeve (64) near the yoke plate (37). An indicator core (62) is installed axially on the guide sleeve (64). A color sleeve (61) is installed at one end of the indicator core (62) away from the yoke plate (37). An indicator spring (65) is installed between the indicator core (62) and the guide sleeve (64).

6. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 2, characterized in that: A stationary iron core (68) is fixedly installed below the yoke plate (37), and a moving iron core (67) is installed below the stationary iron core (68). A return spring (66) is installed between the stationary iron core (68) and the moving iron core (67). A push rod (69) is installed axially between the stationary iron core (68) and the moving iron core (67). A magnetic ring (671) is installed below the moving iron core (67). The position of the indicator iron core (62) is controlled by the magnetic ring (671), thereby displaying the state of the moving iron core (67) and achieving the indication effect.

7. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 2, characterized in that: The yoke plate (37) is equipped with centrally symmetrically distributed auxiliary terminals (35), which are installed through the yoke plate (37). The auxiliary terminals (35) are correspondingly arranged at both ends of the auxiliary moving spring (47). The auxiliary terminals (35) are configured as "L"-shaped, with one end located above the auxiliary moving spring (47) and the other end extending to the outside of the ceramic cover assembly (1).

8. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 6, characterized in that: A magnetic cylinder (77) is installed on the outside of the moving iron core (67) and the stationary iron core (68). A coil frame (74) is fixedly installed on the outside of the magnetic cylinder (77). A circuit board (72) is installed on one end of the coil frame (74) near the U-shaped yoke (6). A wire (71) is connected to the end of the circuit board (72) away from the magnetic cylinder (77). The circuit board (72) is connected to an external power source through the wire (71).

9. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 7, characterized in that: The auxiliary terminal (35) is connected to an auxiliary terminal lead (73) at the end away from the auxiliary moving spring (47); the auxiliary terminal (35) transmits signals to the outside world through the auxiliary terminal lead (73).

10. A three-circuit high-voltage contactor with normally open or normally closed auxiliary contacts as described in claim 7, characterized in that: The auxiliary terminal (35) has a bent portion (351) at one end near the auxiliary moving spring (47), and the bent portion (351) opens upward to achieve stable contact between the auxiliary terminal (35) and the auxiliary moving spring (47).

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