Contact assembly and change-over switch

Abstract

The utility model provides a contact assembly and a change-over switch, and relates to the technical field of low-voltage electrics. The contact assembly provided by the utility model comprises a static contact group and a moving contact group, the moving contact group comprises two cylindrical moving contact rods which are stacked, each moving contact rod comprises a body, and an arc striking part and a closing part which are respectively arranged at the end parts of the body; when the static contact group and the moving contact group are combined for closing, the arc striking part is firstly in rolling type clamping connection with the static contact group, and then the closing part is in rolling type clamping connection with the static contact group; when the static contact group and the moving contact group are switched on, the switching-on part is separated from the static contact group firstly, and then the arc striking part is separated from the static contact group. According to the contact assembly, the arc striking part and the closing part are respectively arranged at the end parts of the moving contact rod, so that the connection or disconnection reliability of the contact assembly is improved, the electric service life of the contact assembly is prolonged, the ablation of electric arc to the moving contact rod is reduced, the contact resistance after test is reduced, and the temperature rise is stable when the contact assembly is closed.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical technology, in particular to a contact assembly and a conversion switch. Background Art

[0002] In the field of electrical technology, automatic transfer switches are used to provide uninterrupted power supply to loads and are able to switch between different power sources to ensure the continuity of power supply.

[0003] Automatic transfer switches usually include two fixed contacts and a movable contact rod, which performs connection and disconnection between the two fixed contacts. The existing movable contact rod is usually a clamping knife-type contact, which is easily eroded by arc during the contact or disconnection between the movable contact rod and the static contact. After the test, the internal resistance is large, the temperature rise is unstable, and it is easy to exceed the range specified by the national standard. Utility Model Content

[0004] The purpose of the utility model is to provide a contact assembly, which is respectively provided with an arc striking part and a closing part at the end of a moving contact rod, thereby improving the reliability and electrical life of the contact assembly in making or breaking, reducing the arc erosion of the moving contact rod, reducing the contact resistance after the test, and stabilizing the temperature rise when the contact assembly is closed.

[0005] The embodiment of the utility model is achieved as follows:

[0006] One aspect of the utility model provides a contact assembly, including a stationary contact group and a moving contact group, the moving contact group including two stacked and cylindrical moving contact rods, the moving contact rod including a main body and an arc-striking part and a closing part respectively arranged at the ends of the main body; when the stationary contact group and the moving contact group are switched, the arc-striking part is firstly connected to the stationary contact group by a rolling clamping connection, and then the closing part is connected to the stationary contact group by a rolling clamping connection; when the stationary contact group and the moving contact group are switched, the closing part is firstly separated from the stationary contact group, and then the arc-striking part is separated from the stationary contact group.

[0007] Optionally, the static contact group includes a static contact plate, which is provided with an arc-striking erosion part and an electrical contact part in sequence along the movement trajectory of the moving contact rod when the switch is closed; when the static contact group and the moving contact group are closed, the electrical contact part is first separated from the moving contact group, and then the arc-striking erosion part is separated from the moving contact group.

[0008] Optionally, when the static contact group and the moving contact group are switched, the arc striking part is first connected to the arc striking erosion part by rolling clamping, and then the closing part is connected to the electrical contact part by rolling clamping; when the static contact group and the moving contact group are switched, the closing part is first separated from the electrical contact part, and then the arc striking part is separated from the arc striking erosion part.

[0009] Optionally, the closing part is made of a first material having conductive properties, and the arc striking part is made of a second material, and the second material is more resistant to ablation than the first material.

[0010] Optionally, the arc striking parts are respectively sleeved on the opposite ends of the moving contact rod, and the arc striking parts can rotate around the body.

[0011] Optionally, the arc striking parts are respectively sleeved on the opposite ends of the moving contact rod, and the arc striking parts are fixedly connected to the body.

[0012] Optionally, the electrical contact portion is made of a first material having conductive properties, and the arc-starting ablation portion is made of a second material, and the second material is more resistant to ablation than the first material.

[0013] Optionally, a relative distance between the electrical contact portion of the stationary contact plate and the closing portion of the moving contact rod is smaller than a relative distance between the arc striking ablation portion and the closing portion of the moving contact rod.

[0014] Optionally, the contact assembly further comprises a contact support, the moving contact group is arranged on the contact support, and the contact support can drive the moving contact group to rotate in a clockwise direction or a counterclockwise direction to contact or separate from the stationary contact group.

[0015] Another aspect of the present invention provides a transfer switch, including a drive device, an operating mechanism and a contact assembly, wherein the drive device can drive the operating mechanism to drive the contact assembly to close or open the transfer switch.

[0016] The beneficial effects of the present invention include at least one of the following:

[0017] The present application provides a contact assembly, including a static contact group and a moving contact group, the moving contact group includes two stacked and cylindrical moving contact rods, the moving contact rod includes a body and an arc-striking part and a closing part respectively arranged at the ends of the body; when the static contact group and the moving contact group are switched, the arc-striking part is first connected to the static contact group by rolling clamping, and then the closing part is connected to the static contact group by rolling clamping; when the static contact group and the moving contact group are switched, the closing part is first separated from the static contact group, and then the arc-striking part is separated from the static contact group. The above-mentioned contact assembly is respectively provided with an arc-striking part and a closing part at the ends of the moving contact rod, which improves the reliability and electrical life of the contact assembly when it is connected or disconnected, reduces the arc erosion on the moving contact rod, reduces the contact resistance after the test, and stabilizes the temperature rise when the contact assembly is closed.

[0018] The present application also provides a transfer switch, including a drive device, an operating mechanism and a contact assembly, wherein the drive device can drive the operating mechanism to drive the contact assembly to close or open the transfer switch. The transfer switch can improve the reliability and electrical life of the transfer switch when it is connected or disconnected by respectively arranging an arc-starting part and a closing part at the end of the moving contact rod of the contact assembly, and reduce the ablation of the contact assembly by the arc, thereby improving the service life and conductivity of the contact assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a contact assembly provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of the contact support and the movable contact assembly of the contact assembly provided in the embodiment of the utility model;

[0022] Figure 3 for Figure 2 Sectional view along AA;

[0023] Figure 4 A schematic structural diagram of a movable contact rod of a contact assembly provided in an embodiment of the utility model;

[0024] Figure 5 A schematic structural diagram of a stationary contact plate of a contact assembly provided in an embodiment of the utility model.

[0025] Icon: 100-contact assembly; 110-moving contact group; 111-moving contact rod; 1111-body; 1111a-arcing part; 1111b-closing part; 112-bolt; 120-stationary contact group; 121-stationary contact plate; 1211-arcing ablation part; 1212-electrical contact part; 130-contact support. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 The present embodiment provides a contact assembly 100, including a stationary contact group 120 and a moving contact group 110, the moving contact group 110 includes two stacked and cylindrical moving contact rods 111, the moving contact rod 111 includes a body 1111 and an arc-striking portion 1111a and a closing portion 1111b respectively arranged at the ends of the body 1111; when the stationary contact group 120 and the moving contact group 110 are closed, the arc-striking portion 1111a is firstly connected to the stationary contact group 120 by rolling clamping, and then the closing portion 1111b is connected to the stationary contact group 120 by rolling clamping; when the stationary contact group 120 and the moving contact group 110 are opened, the closing portion 1111b is firstly separated from the stationary contact group 120, and then the arc-striking portion 1111a is separated from the stationary contact group 120.

[0033] Specifically, the contact assembly 100 includes a stationary contact group 120 and a moving contact group 110. Figure 3 As shown, the moving contact group 110 includes two stacked moving contact rods 111, which are cylindrical in structure, and a sufficient gap is provided between the two moving contact rods 111 for rolling clamping of the stationary contact group 120. The moving contact rod 111 can rotate clockwise or counterclockwise with the center point as the rotation center, and is clamped and connected with the stationary contact group 120 to realize the closing of the transfer switch.

[0034] The movable contact rod 111 includes a body 1111, and an arc-starting portion 1111a and a closing portion 1111b are sleeved at the end of the body 1111. In order to improve the connection stability between the arc-starting portion 1111a and the body 1111, the end of the arc-starting portion 1111a can be connected to the body 1111 by a bolt 112. The closing portion 1111b is made of a first material with conductive properties, and the arc-starting portion 1111a is made of a second material, which is more resistant to ablation than the first material. The second material is resistant to ablation, and the arc-starting portion 1111a composed of the second material composition is sleeved on the end of the body 1111. When the moving contact rod 111 rotates clockwise or counterclockwise with the center point as the rotation center and is clamped with the stationary contact group 120, the arc-starting portion 1111a sleeved on the end of the moving contact rod 111 is firstly connected with the stationary contact group 120 by rolling clamping, and then the closing portion 1111b is connected with the stationary contact group 120 by rolling clamping; when the stationary contact group 120 and the moving contact group 110 are disconnected, the closing portion 1111b is firstly separated from the stationary contact group 120, and then the arc-starting portion 1111a is separated from the stationary contact group 120. The arc-starting portion 1111a can protect the body 1111 of the moving contact rod 111 from arc ablation, reduce the contact resistance after the test, and stabilize the temperature rise of the contact assembly 100 when closing.

[0035] It should be noted that the moving contact rod 111 forms a structure in which the ends are the second material and the first material in order from the outside to the inside. When the contact assembly 100 is closed, the arc-starting portion 1111a at the end of the moving contact rod 111 can be first clamped and connected with the stationary contact group 120. Since the arc-starting portion 1111a is composed of the second material composition, the body 1111 of the moving contact rod 111 can be protected from arc erosion; the moving contact rod 111 continues to move, so that the closing portion 1111b of the moving contact rod 111 is clamped and connected with the stationary contact group 120. Since the closing portion 1111b is composed of the first material composition, the conductivity of the contact assembly 100 can be improved.

[0036] Second, the body 1111 of the movable contact rod 111 is a rod-shaped structure, and the arc-striking parts 1111a are respectively sleeved on the opposite ends of the movable contact rod 111 , and the arc-striking parts 1111a can rotate around the body 1111 , or the arc-striking parts 1111a are fixedly connected to the body 1111 .

[0037] Specifically, Figure 4 As shown, the body 1111 of the movable contact rod 111 is a rod-shaped structure, and the two opposite ends of the movable contact rod 111 are sleeved with arc-starting parts 1111a; Figure 1 As shown, the stationary contact group 120 includes two stationary contact plates 121, which are located on the same side of the moving contact group 110 and are arranged side by side; the moving contact rod 111 rotates clockwise or counterclockwise with its center point as the rotation center, and can contact or separate from the two stationary contact plates 121 respectively to realize the switching of the normal power supply and the backup power supply. Among them, the arc-striking portion 1111a is movably mounted on the main body 1111 and can rotate relative to the main body 1111, or the arc-striking portion 1111a is fixedly mounted on the end of the main body 1111; when the contact assembly 100 is closed, the two stacked moving contact rods 111 move in a clockwise or counterclockwise direction and clamp the stationary contact plate 121, and the arc-striking portion 1111a is rotatably arranged at the end of the main body 1111, so that when the stationary contact plate 121 is clamped between the two stacked arc-striking portions 1111a, the moving contact rod 111 can still stably realize movement in a clockwise or counterclockwise direction through the rotation of the arc-striking portion 1111a, so as to realize the closing of the contact assembly 100.

[0038] The contact assembly 100 provided in the present application includes a static contact group and a moving contact group. The moving contact group includes two stacked and cylindrical moving contact rods. The moving contact rod includes a body and an arc-striking part and a closing part respectively arranged at the ends of the body. When the static contact group and the moving contact group are switched, the arc-striking part is first connected to the static contact group by rolling clamping, and then the closing part is connected to the static contact group by rolling clamping. When the static contact group and the moving contact group are switched, the closing part is first separated from the static contact group, and then the arc-striking part is separated from the static contact group. The above-mentioned contact assembly is respectively provided with an arc-striking part and a closing part at the ends of the moving contact rod, which improves the reliability and electrical life of the contact assembly when it is connected or disconnected, reduces the arc erosion on the moving contact rod, reduces the contact resistance after the test, and stabilizes the temperature rise when the contact assembly is closed.

[0039] In one possible implementation mode of the present application, the static contact group 120 includes a static contact plate 121, and the static contact plate 121 is provided with an arc-striking ablation portion 1211 and an electrical contact portion 1212 in sequence along the movement trajectory of the moving contact rod 111 when the switch is closed; when the static contact group 120 and the moving contact group 110 are opened, the electrical contact portion 1212 is first separated from the moving contact group 110, and then the arc-striking ablation portion 1211 is separated from the moving contact group 110.

[0040] Specifically, Figure 1 and Figure 5As shown, the stationary contact group 120 includes two stationary contact plates 121, and the two stationary contact plates 121 are located on the same side of the moving contact group 110 and are arranged side by side; when the contact assembly 100 is closed, the moving contact rod 111 rotates in a clockwise or counterclockwise direction with the center point as the rotation center to move toward the stationary contact plate 121; the plate surface of the stationary contact plate 121 is composed of an arc-striking ablation portion 1211 and an electrical contact portion 1212, and in the trajectory of the moving contact rod 111 moving toward the stationary contact plate, it can pass through the arc-striking ablation portion 1211 and the electrical contact portion 1212 arranged on the stationary contact plate 121 in sequence; when the stationary contact group 120 and the moving contact group 110 are opened, the electrical contact portion 1212 is first separated from the moving contact group 110, and then the arc-striking ablation portion 1211 is separated from the moving contact group 110.

[0041] For example, the moving contact group 110 moves toward the stationary contact group 120, and the arc-striking portions 1111a of the two moving contact rods 111 can clamp the arc-striking ablation portion 1211 of the stationary contact plate 121. A closing portion 1111b is also provided on the main body 1111 of the two moving contact rods 111. The closing portion 1111b is arranged on a side where the two arc-striking portions 1111a are close to each other, and the two closing portions 1111b can clamp the electrical contact portion 1212 of the stationary contact plate 121.

[0042] Furthermore, the electrical contact portion is made of a first material having conductive properties, and the arc-starting ablation portion is made of a second material, and the second material is more resistant to ablation than the first material.

[0043] Specifically, when the moving contact rod 111 moves toward the stationary contact group 120, the arc-starting portion 1111a located at the end of the two stacked moving contact rods 111 can clamp the arc-starting ablation portion 1211 of the stationary contact plate 121, and the moving contact rod 111 continues to move in the clockwise direction or counterclockwise direction, so that the closing portion 1111b of the two stacked moving contact rods 111 can clamp the electrical contact portion 1212 of the stationary contact plate 121.

[0044] Among them, the electrical contact portion 1212 of the stationary contact plate 121 is composed of a first material composition with conductive properties, and the first material has good conductive properties; the arc-starting and ablation portion 1211 of the stationary contact plate 121 is composed of a second material composition that is resistant to ablation, and the second material is more resistant to ablation than the first material, and can protect the stationary contact from arc ablation, thereby reducing the contact resistance after the test and stabilizing the temperature rise of the contact assembly 100 when closing the switch; therefore, by clamping the arc-starting and ablation portion 1211a of the moving contact rod 111 and the arc-starting and ablation portion 1211 of the stationary contact plate 121, and clamping the closing portion 1111b of the moving contact rod 111 and the electrical contact portion 1212 of the stationary contact plate 121, the reliability and electrical life of the contact assembly 100 when making or breaking can be improved, and the ablation of the contact assembly 100 by the arc is reduced, thereby improving the conductivity of the contact assembly 100.

[0045] When the static contact group and the moving contact group are switched, the arc-striking part is first connected with the arc-striking ablation part by rolling clamping, and the closing part is connected with the electrical contact part by rolling clamping; when the static contact group and the moving contact group are switched, the closing part is first separated from the electrical contact part, and the arc-striking part is separated from the arc-striking ablation part. This arrangement enables the arc-striking part to strike an arc during the opening and closing process of the static contact group and the moving contact group, improves the reliability and electrical life of the contact assembly when it is connected or disconnected, reduces the arc ablation of the moving contact rod, reduces the contact resistance after the test, and stabilizes the temperature rise of the contact assembly when it is closed.

[0046] For example, the relative distance between the electric contact portion 1212 of the stationary contact plate 121 and the closing portion 1111 b of the moving contact rod 111 is smaller than the relative distance between the arc-starting ablation portion 1211 and the closing portion 1111 b of the moving contact rod 111 .

[0047] Specifically, Figure 1 and Figure 5 As shown, in order to ensure that the moving contact rod 111 can successively make the arc-starting portion 1111a and the arc-starting ablation portion 1211 of the stationary contact plate 121 clamped and connected, and make the closing portion 1111b and the electrical contact portion 1212 of the stationary contact plate 121 clamped and connected during the movement, the relative distance between the electrical contact portion 1212 of the stationary contact plate 121 and the closing portion 1111b of the moving contact rod 111 should be smaller than the relative distance between the arc-starting ablation portion 1211 and the closing portion 1111b of the moving contact rod 111.

[0048] Since the arc-starting portion 1111a is sleeved at the two opposite ends of the body 1111, when the movable contact rod 111 rotates in a clockwise or counterclockwise direction to move toward the stationary contact plate 121, the arc-starting portion 1111a at the end can first be clamped and connected with the arc-starting ablation portion 1211 of the stationary contact plate 121; the movable contact rod 111 continues to rotate. At this time, in order to make the closing portion 1111b and the electrical contact portion 1212 of the stationary contact plate 121 clamped and connected, the electrical contact portion 1212 of the stationary contact plate 121 should be as close to the closing portion 1111b of the movable contact rod 111 as possible. Therefore, if Figure 1 and Figure 5 As shown, the relative distance between the electrical contact portion 1212 of the stationary contact plate 121 and the closing portion 1111b of the moving contact rod 111 should be smaller than the relative distance between the arc-striking erosion portion 1211 and the closing portion 1111b of the moving contact rod 111, so that the side edge of the electrical contact portion 1212 is protruded relative to the side edge of the arc-striking erosion portion 1211; in order to ensure that the boundary between the arc-striking erosion portion 1211 and the electrical contact portion 1212 is clearer, and thus to ensure that the conversion of the clamping process between the arc-striking erosion portion 1211 and the electrical contact portion 1212 of the moving contact rod 111 and the stationary contact plate 121 is smoother and more reliable, a groove can also be provided at the connection between the arc-striking erosion portion 1211 and the electrical contact portion 1212.

[0049] In one possible implementation of the present application, the contact assembly 100 further includes a contact support 130 , and the moving contact group 110 is disposed on the contact support 130 . The contact support 130 can drive the moving contact group 110 to rotate in a clockwise direction or a counterclockwise direction to contact or separate from the stationary contact group 120 .

[0050] Specifically, Figure 2 and Figure 3 As shown, the contact assembly 100 further includes a contact support 130, and the moving contact group 110 is arranged in the middle of the contact support 130, and the arc-starting part 1111a and the closing part 1111b at both ends are exposed. The stationary contact plate 121 of the stationary contact group 120 is arranged on one side of the contact support 130, and the contact support 130 can rotate in a clockwise or counterclockwise direction with its center as the rotation center, thereby driving the moving contact group 110 arranged on the contact support 130 to rotate, so that the two stacked moving contact rods 111 of the moving contact group 110 move toward the stationary contact plate 121, and the stationary contact plate 121 is clamped between the two moving contact rods 111.

[0051] In another aspect of the embodiment of the present application, a transfer switch is also provided. The transfer switch includes a driving device, an operating mechanism and a contact assembly 100. The driving device can drive the operating mechanism to drive the contact group 110 to achieve the closing or opening of the transfer switch. The transfer switch can improve the reliability and electrical life of the connection or disconnection of the transfer switch by respectively providing an arc-starting part and a closing part at the end of the moving contact rod 111, and reduce the ablation of the contact assembly 100 by the arc, thereby improving the service life and conductivity of the contact assembly 100. Among them, the specific structure and beneficial effects of the contact assembly 100 have been described in detail above and will not be repeated here.

[0052] In another aspect of the embodiment of the present application, a power distribution device is provided. The power distribution device is equipped with a transfer switch. The transfer switch includes a drive device, an operating mechanism and the contact assembly 100. The drive device can drive the operating mechanism to drive the contact assembly 110 to realize the closing and opening functions of the transfer switch. The power distribution device can be equipped with the above-mentioned transfer switch. The power distribution device can be equipped with the power distribution device. The power distribution device can be equipped with the whole house intelligence, and should be equipped with the smart home and the Internet of Things industry to realize the whole house intelligent management.

[0053] The above description is only an optional embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A contact assembly, characterized in that: The invention comprises a stationary contact group (120) and a moving contact group (110), wherein the moving contact group (110) comprises two stacked and cylindrical moving contact rods (111), wherein the moving contact rod (111) comprises a body (1111) and an arc striking part (1111a) and a closing part (1111b) respectively arranged at the ends of the body (1111); the stationary contact group (120) and the moving contact group (110) are closed. When the static contact group (120) and the moving contact group (110) are switched on and off, the arc striking part (1111a) is first connected to the static contact group (120) by rolling clamping, and the closing part (1111b) is then connected to the static contact group (120) by rolling clamping; when the static contact group (120) and the moving contact group (110) are switched off, the closing part (1111b) is first separated from the static contact group, and the arc striking part (1111a) is then separated from the static contact group.

2. The contact assembly according to claim 1, characterized in that: The stationary contact group (120) comprises a stationary contact plate (121), and the stationary contact plate (121) is provided with an arc-striking ablation portion (1211) and an electrical contact portion (1212) in sequence along a movement trajectory of the moving contact rod (111) when the moving contact rod (111) is closed; when the stationary contact group (120) and the moving contact group (110) are opened, the electrical contact portion (1212) is first separated from the moving contact group (110), and then the arc-striking ablation portion (1211) is separated from the moving contact group (110).

3. The contact assembly according to claim 2, characterized in that: When the stationary contact group (120) and the moving contact group (110) are closed, the arc-striking portion (1111a) is first connected to the arc-striking erosion portion (1211) by rolling clamping, and then the closing portion (1111b) is connected to the electrical contact portion (1212) by rolling clamping; when the stationary contact group (120) and the moving contact group (110) are opened, the closing portion (1111b) is first separated from the electrical contact portion (1212), and then the arc-striking portion (1111a) is separated from the arc-striking erosion portion (1211).

4. The contact assembly according to claim 1, characterized in that: The closing part (1111b) is made of a first material having conductive properties, and the arc striking part (1111a) is made of a second material, which is more resistant to ablation than the first material.

5. The contact assembly according to claim 2 or 3, characterized in that: The electrical contact portion (1212) is made of a first material having conductive properties, and the arc-starting ablation portion (1211) is made of a second material, which is more resistant to ablation than the first material.

6. The contact assembly according to claim 1, characterized in that: The arc-starting portion (1111a) is respectively sleeved on the opposite ends of the moving contact rod (111), and the arc-starting portion (1111a) is capable of rotating around the body (1111).

7. The contact assembly according to claim 1, characterized in that: The arc-starting portion (1111a) is respectively sleeved on the opposite ends of the moving contact rod (111), and the arc-starting portion (1111a) is fixedly connected to the body (1111).

8. The contact assembly according to claim 2, characterized in that: The relative distance between the electrical contact portion (1212) of the stationary contact plate (121) and the closing portion (1111b) of the moving contact rod (111) is smaller than the relative distance between the arc striking ablation portion (1211) and the closing portion (1111b) of the moving contact rod (111).

9. The contact assembly according to claim 1, characterized in that: The contact assembly (100) further comprises a contact support (130), the movable contact group (110) being arranged on the contact support (130), and the contact support (130) being capable of driving the movable contact group (110) to rotate in a clockwise direction or a counterclockwise direction so as to contact or separate from the stationary contact group (120).

10. A transfer switch, characterized in that: It comprises a driving device, an operating mechanism and a contact assembly as claimed in any one of claims 1 to 9, wherein the driving device can drive the operating mechanism to drive the contact assembly (100) to achieve closing or opening of the switching switch.

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