A contact assembly, transfer switch, and power distribution apparatus

Abstract

The application provides a contact assembly, a change-over switch and a power distribution device, and relates to the technical field of low-voltage electrical apparatuses. The contact assembly comprises a mounting shell, a driving member, a normally-used static contact, a backup static contact, a neutral pole moving contact and phase pole moving contacts; the driving member, the normally-used static contact, the backup static contact, the neutral pole moving contact and the phase pole moving contacts are arranged in the mounting shell; the driving member is connected with the phase pole moving contacts and the neutral pole moving contact, and is used for synchronously and reversely moving the phase pole moving contacts and the neutral pole moving contact, so that the phase pole moving contacts are in contact with the normally-used static contact or the backup static contact, and the neutral pole moving contact is in contact with the normally-used static contact and the backup static contact when the phase pole moving contacts are separated from the normally-used static contact and the backup static contact, thereby eliminating the safety hazard caused by the zero line being empty, and the contact assembly has the advantages of simple structure, few components, reliable action, large contact opening distance and the like, and can meet the design requirements of product miniaturization and modularization.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and more specifically, to a contact assembly, a changeover switch, and a power distribution device. Background Technology

[0002] The four-pole automatic transfer switch includes a neutral pole unit and a phase pole unit. Both the neutral pole unit and the phase pole unit rotate between two stationary contacts through a moving contact assembly, thereby making contact with the stationary contacts of the main or standby power supply respectively, realizing the switching between the main power supply and the standby power supply.

[0003] Current transfer switches completely disconnect one power source before closing the other during the switching process. While this ensures complete isolation between the two power sources and avoids short circuits, the neutral wire at the load end is completely disconnected during the switching process, resulting in the neutral wire being left unconnected, which can damage the power distribution equipment. Summary of the Invention

[0004] This invention provides a contact assembly, a changeover switch, and a power distribution device that can eliminate the safety hazards caused by the neutral wire being left unconnected.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a contact assembly, including a mounting housing, a driving component, a common stationary contact, a spare stationary contact, a neutral pole moving contact, and a phase pole moving contact;

[0007] The driving component, the commonly used stationary contact, the spare stationary contact, the neutral pole moving contact, and the phase pole moving contact are all disposed in the mounting housing;

[0008] The driving member is connected to both the neutral pole moving contact and the phase pole moving contact, and the driving member is used to move synchronously with the phase pole moving contact and to make the neutral pole moving contact move synchronously in the opposite direction to the phase pole moving contact, so that the neutral pole moving contact contacts the normal stationary contact and the spare stationary contact when the phase pole moving contact is open from the normal stationary contact and the spare stationary contact.

[0009] In an optional embodiment, the contact assembly further includes a transmission member movably disposed in the mounting housing. The driving member and the neutral polarity moving contact are linked through the transmission member. The driving member is used to rotate synchronously with the phase polarity moving contact along a first direction and drive the transmission member to rotate along a second direction opposite to the first direction, so as to drive the neutral polarity moving contact to move synchronously in the opposite direction relative to the phase polarity moving contact through the transmission member.

[0010] In an optional embodiment, the driving member includes a first gear portion, and the transmission member includes a second gear portion, wherein the first gear portion meshes with the second gear portion.

[0011] In an optional embodiment, the phase pole moving contact includes a first contact portion and a second contact portion. When the first contact portion contacts the commonly used stationary contact, the neutral pole moving contact contacts the commonly used stationary contact, thus presenting a first state.

[0012] The phase pole moving contact moves along the first direction, the first contact portion is disconnected from the commonly used stationary contact, the transmission member moves synchronously with the phase pole moving contact, and the transmission member drives the neutral pole moving contact to move along the second direction to contact the commonly used stationary contact and the spare stationary contact, so as to be in the second state;

[0013] The phase pole moving contact continues to move along the first direction, the second contact portion contacts the spare stationary contact, the transmission member moves synchronously with the phase pole moving contact, and the transmission member drives the neutral pole moving contact to move along the second direction to separate from the commonly used stationary contact and continue to contact the spare stationary contact, so as to be in the third state.

[0014] In an optional embodiment, the neutral polar moving contact includes a connecting portion and a contact portion. One end of the connecting portion is connected to the transmission member, and the other end is connected to the contact portion. The contact portion is used to contact the commonly used stationary contact and / or the spare stationary contact.

[0015] In an optional embodiment, the contact portion extends in a direction perpendicular to the connecting portion to form a connected third contact portion and a fourth contact portion;

[0016] In the first state, the third contact portion is in contact with the commonly used stationary contact;

[0017] In the second state, the third contact portion contacts the spare stationary contact, and the fourth contact portion contacts the commonly used stationary contact;

[0018] In the third state, the fourth contact portion contacts the spare stationary contact.

[0019] In an optional embodiment, the neutral pole moving contact includes two spaced-apart contact pieces, the connecting portion and the contact portion forming the contact pieces, and the two contact pieces being used to contact both sides of the commonly used stationary contact or the spare stationary contact.

[0020] In an optional embodiment, the contact assembly further includes an elastic element disposed in the mounting housing and connected to the contact piece, for giving the two contact pieces a tendency to move relative to each other.

[0021] In a second aspect, the present invention provides a changeover switch, including a contact assembly as described in any of the foregoing embodiments.

[0022] Thirdly, the present invention provides a power distribution device, including a changeover switch as described in the foregoing embodiments.

[0023] The beneficial effects of the contact assembly, changeover switch, and power distribution equipment provided in this invention include: By using a driving component to cause the phase-pole moving contact and the neutral-pole moving contact to move synchronously in opposite directions, so that while the phase-pole moving contact is in the process of opening with both the commonly used stationary contact and the spare stationary contact, the neutral-pole moving contact simultaneously contacts both the commonly used stationary contact and the spare stationary contact. This ensures that the neutral-pole moving contact is connected to at least one of the commonly used power supply and the spare power supply, thereby guaranteeing that the neutral line at the load end remains connected and not completely disconnected during the changeover process. In other words, the output neutral line of the changeover switch is always connected to the neutral line of the input power grid, thus eliminating the safety hazards caused by the neutral line being unconnected. Furthermore, this contact assembly also has the advantages of simple structure, few parts, reliable operation, and large contact opening distance, meeting the design requirements for product miniaturization and modularization. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 One of the schematic diagrams of the contact assembly in the first state provided in the embodiment of the present invention;

[0026] Figure 2 The contact assembly provided in the embodiment of the present invention is located in the second schematic diagram of the first state structure;

[0027] Figure 3 One of the schematic diagrams of the contact assembly in the second state provided in the embodiment of the present invention;

[0028] Figure 4 The contact assembly provided in the embodiment of the present invention is located in the second state structure diagram;

[0029] Figure 5 One of the schematic diagrams of the contact assembly in the third state provided in the embodiment of the present invention;

[0030] Figure 6 The second schematic diagram of the contact assembly in the third state structure provided in the embodiment of the present invention;

[0031] Figure 7This is an exploded view of the contact assembly structure provided in an embodiment of the present invention.

[0032] Icons: 10-Contact assembly; 100-Mounting housing; 200-Driver; 210-First gear section; 300-Common stationary contact; 400-Spare stationary contact; 500-Neutral pole moving contact; 510-Contact piece; 511-Connecting part; 512-Contact part; 5121-Third contact part; 5122-Fourth contact part; 600-Phase pole moving contact; 610-First contact part; 620-Second contact part; 700-Transmission component; 710-Second gear section; 800-Elastic component. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0037] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0039] The four-pole automatic transfer switch includes a neutral pole unit and a phase pole unit. Both the neutral pole unit and the phase pole unit rotate between two stationary contacts through a moving contact assembly, thereby making contact with the stationary contacts of the main or standby power supply respectively, realizing the switching between the main power supply and the standby power supply.

[0040] Current transfer switches completely disconnect one power source before closing the other during the transfer process. While this ensures complete isolation between the two power sources and avoids short circuits, the neutral wire at the load end is completely disconnected during the transfer, resulting in the neutral wire being left unconnected. This could damage the power distribution equipment. Many existing power distribution systems do not allow the neutral point to be disconnected during the transfer process.

[0041] Therefore, to solve the above problems, this invention provides a transfer switch that enables the N phase to remain in contact with the normal or standby neutral line during the switching process of dual power supplies, and the N phase also completes the switching simultaneously after the ABC phase switching is completed. The transfer switch includes a contact assembly.

[0042] Please see Figures 1 to 7 The contact assembly 10 includes a mounting housing 100, a drive unit 200, a common stationary contact 300, a spare stationary contact 400, a neutral pole moving contact 500, and a phase pole moving contact 600.

[0043] The drive unit 200, the commonly used stationary contact 300, the spare stationary contact 400, the neutral pole moving contact 500, and the phase pole moving contact 600 are all disposed in the mounting housing 100. The drive unit 200 is linked with both the neutral pole moving contact 500 and the phase pole moving contact 600. The drive unit 200 moves synchronously with the phase pole moving contact 600 and causes the neutral pole moving contact 500 to move synchronously in the opposite direction to the phase pole moving contact 600. The drive unit 200 drives the neutral pole moving contact. The neutral pole moving contact 500 and the phase pole moving contact 600 move in opposite directions synchronously, so that the phase pole moving contact 600 contacts the normal stationary contact 300 or the spare stationary contact 400, so that the neutral pole moving contact 500 can contact the normal stationary contact 300 and the spare stationary contact 400 when the phase pole moving contact 600 is open. In short, the neutral pole moving contact 500 and the phase pole moving contact 600 move in opposite directions synchronously through the driving member 200.

[0044] In this embodiment, the driving component 200 is connected to and moves synchronously with the phase-pole moving contact 600, causing the phase-pole moving contact 600 to rotate relative to the mounting housing 100 and contact the commonly used stationary contact 300 or the spare stationary contact 400. It should be noted that the driving component 200 is typically connected to a motor or other motion mechanism to rotate under the drive of the motor or other motion mechanism; furthermore, the driving component 200 and the phase-pole moving contact 600 are integrally formed, but they can also be two separate parts, which is not specifically limited here.

[0045] The drive unit 200 is also connected to and moves synchronously with the neutral pole moving contact 500, so as to make the neutral pole moving contact 500 move synchronously in the opposite direction to the phase pole moving contact 600, so that the neutral pole moving contact 500 contacts the normal stationary contact 300 and the spare stationary contact 400 when the phase pole moving contact 600 is open with the normal stationary contact 300 and the spare stationary contact 400.

[0046] It should be noted that the commonly used stationary contact 300 includes a commonly used neutral pole stationary contact and a commonly used phase pole stationary contact, and the spare stationary contact 400 includes a spare neutral pole stationary contact and a spare phase pole stationary contact. Therefore, when the phase pole moving contact 600 is in contact with the commonly used stationary contact 300 or the spare stationary contact 400, it means that the phase pole moving contact 600 is in contact with the commonly used phase pole stationary contact or the spare phase pole stationary contact. Similarly, when the neutral pole moving contact 500 is in contact with the commonly used stationary contact 300 or the spare stationary contact 400, it means that the neutral pole moving contact 500 is in contact with the commonly used neutral pole stationary contact or the spare neutral pole stationary contact. For the sake of brevity, only the commonly used stationary contact 300 and the spare stationary contact 400 will be mentioned below.

[0047] In this embodiment, the driving component 200 rotates synchronously with the phase-pole moving contact 600, causing the phase-pole moving contact 600 to close with the normal stationary contact 300, thereby connecting the normal power supply. The driving component 200 can also move synchronously with the phase-pole moving contact 600, causing the phase-pole moving contact 600 to close with the standby stationary contact 400, thereby connecting the standby power supply. Therefore, by rotating the phase-pole moving contact 600, the transfer switch switches between the normal power supply and the standby power supply, thereby providing uninterrupted power to the load and ensuring the continuity of power supply.

[0048] While the phase-pole moving contact 600 rotates, the driving component 200 and the neutral-pole moving contact 500 rotate synchronously. This ensures that during the switching process between the normal power supply and the backup power supply (i.e., when both the phase-pole moving contact 600 and the normal stationary contact 300 and the backup stationary contact 400 are open), the neutral-pole moving contact 500 contacts both the normal stationary contact 300 and the backup stationary contact 400 simultaneously with the synchronous movement of the driving component 200. This guarantees that the neutral-pole moving contact 500 is connected to at least one of the normal power supply and the backup power supply, ensuring that the neutral line at the load end remains connected and not completely disconnected during the switching process. In other words, the output neutral line of the switching switch is always connected to the neutral line of the input power grid, eliminating the safety hazard caused by a detached neutral line. Furthermore, this contact assembly 10 has the advantages of simple structure, few parts, reliable operation, and large contact opening distance, meeting the design requirements for product miniaturization and modularization.

[0049] Furthermore, the contact assembly 10 also includes a transmission member 700, which is movably disposed in the mounting housing 100 and connected to the drive member 200. The neutral pole moving contact 500 is connected to the transmission member 700, and the phase pole moving contact 600 is connected to the drive member 200. The drive member 200 is used to drive the phase pole moving contact 600 to rotate synchronously in a first direction (e.g., clockwise) and drive the transmission member 700 to rotate in a second direction opposite to the first direction (e.g., counterclockwise) so as to drive the neutral pole moving contact 500 to move synchronously in the opposite direction to the phase pole moving contact 600.

[0050] In this embodiment, by connecting the transmission component 700 to the drive component 200 and rotating synchronously with the neutral pole moving contact 500 and the phase pole moving contact 600, the neutral pole moving contact 500 is always in contact with the commonly used stationary contact 300 and the spare stationary contact 400 during the switching process. After the phase pole moving contact 600 completes the switching, the transmission component 700 drives the neutral pole moving contact 500 to complete the switching synchronously.

[0051] It is understandable that the transmission component 700 can be a gear structure, a rack structure, or a linkage mechanism, as long as it can meet the above requirements.

[0052] Specifically, the drive member 200 includes a first gear portion 210, and the transmission member 700 includes a second gear portion 710, with the first gear portion 210 meshing with the second gear portion 710.

[0053] In this embodiment, the first gear 210 meshes with the second gear 710 to achieve the following: the phase pole moving contact 600 rotates clockwise while the neutral pole moving contact 500 rotates counterclockwise via the transmission member 700; or the phase pole moving contact 600 rotates counterclockwise while the neutral pole moving contact 500 rotates clockwise via the transmission member 700.

[0054] Furthermore, the phase-pole moving contact 600 includes a first contact portion 610 and a second contact portion 620, such as... Figure 1 and Figure 2 As shown, the drive unit 200 is used to drive the first contact portion 610 to contact the normal stationary contact 300 and the second contact portion 620 to disconnect from the spare stationary contact 400, and to drive the transmission unit 700 to drive the neutral pole moving contact 500 to contact the normal stationary contact 300 and disconnect from the spare contact, so as to be in the first state. In this case, the normal power supply supplies power to the load.

[0055] like Figure 3 and Figure 4 As shown, the driving member 200 is also used to drive the first contact portion 610 and the second contact portion 620 to open with the normal stationary contact 300 and the spare stationary contact 400, and to drive the transmission member 700 to drive the neutral pole moving contact 500 to contact with the normal stationary contact 300 and the spare stationary contact 400, so as to be in the second state.

[0056] like Figure 5 and Figure 6 As shown, the drive unit 200 is also used to drive the second contact 620 to contact the spare stationary contact 400 and the first contact 610 to disconnect from the normal stationary contact 300, and drive the neutral pole moving contact 500 to contact the spare stationary contact 400 to form a third state, in which the backup power supply supplies power to the load.

[0057] Therefore, through the above settings, the neutral pole moving contact 500 is synchronously switched after the phase pole moving contact 600 completes the switch; and it is ensured that in the dual-state, the neutral pole moving contact 500 is simultaneously in contact with the normal stationary contact 300 and the spare stationary contact 400, so as to ensure that the neutral pole moving contact 500 is connected to at least one of the normal power supply and the spare power supply. This ensures that during the switching process, the neutral line at the load end is always connected and will not be completely disconnected. That is, the output neutral line of the switching switch is always connected to the neutral line of the input power grid, thereby eliminating the safety hazards caused by the neutral line being unsupported.

[0058] Furthermore, the neutral pole moving contact 500 includes a connecting portion 511 and a contact portion 512. One end of the connecting portion 511 is connected to the transmission member 700, and the other end is connected to the contact portion 512. The contact portion 512 is used to contact the commonly used stationary contact 300 and / or the spare stationary contact 400.

[0059] In this embodiment, the connecting part 511 can rotate around the rotation center of the transmission member 700 under the drive of the transmission member 700, so that the connecting part 511 can drive the contact part 512 to contact the commonly used stationary contact 300, or the spare stationary contact 400, or simultaneously contact the commonly used stationary contact 300 and the spare stationary contact 400.

[0060] Furthermore, the contact portion 512 extends in a direction perpendicular to the connecting portion 511 to form a third contact portion 5121 and a fourth contact portion 5122 connected to each other, so that the neutral polar moving contact 500 is T-shaped.

[0061] In the first state, the third contact portion 5121 is in contact with the commonly used stationary contact 300;

[0062] In the second state, the third contact portion 5121 contacts the spare stationary contact 400, and the fourth contact portion 5122 contacts the commonly used stationary contact 300. Therefore, by providing the third contact portion 5121 and the fourth contact portion 5122, it is convenient for the neutral pole moving contact 500 to contact both the commonly used stationary contact 300 and the spare contact simultaneously.

[0063] In the third state, the fourth contact portion 5122 makes contact with the spare stationary contact 400.

[0064] Furthermore, the neutral pole moving contact 500 includes two spaced-apart contact pieces 510. The connecting portion 511 and the contact portion 512 form the contact pieces 510. The two contact pieces 510 are used to contact the two sides of the commonly used stationary contact 300 or the spare stationary contact 400. In other words, the neutral pole moving contact 500 contacts the commonly used stationary contact 300 or the spare stationary contact 400 in a clamping manner. Compared with the existing snap-fit ​​contact structure, it can avoid the phenomenon that a large current repulsion occurs in the neutral line, resulting in the neutral line being left unsupported.

[0065] Furthermore, the contact assembly 10 also includes an elastic element 800, which is disposed in the mounting housing 100 and connected to the contact piece 510, for giving the two contact pieces 510 a tendency to move relative to each other.

[0066] In this embodiment, there are two elastic elements 800. The two elastic elements 800 act on the two contact pieces 510 respectively, which helps to make the two contact pieces 510 make stable contact with the stationary contact, thereby improving the closing stability.

[0067] Optionally, the elastic element 800 is a spring sheet.

[0068] In summary, this embodiment of the invention provides a contact assembly 10 and a changeover switch. During the opening process of the phase pole moving contact 600, the commonly used stationary contact 300, and the spare stationary contact 400, the neutral pole moving contact 500 contacts both the commonly used stationary contact 300 and the spare stationary contact 400 simultaneously with the synchronous movement of the driving element 200. This ensures that the neutral pole moving contact 500 is connected to at least one of the commonly used and spare power supplies, thereby guaranteeing that the neutral line at the load end remains connected and not completely disconnected during the changeover process. In other words, the output neutral line of the changeover switch is always connected to the neutral line of the input power grid, thus eliminating the safety hazard caused by a detached neutral line. Furthermore, the contact assembly 10 also has the advantages of simple structure, few parts, reliable operation, and large contact opening distance, meeting the design requirements for product miniaturization and modularization.

[0069] Furthermore, the present invention also provides a power distribution device, including the transfer switch described in the above embodiments. The power distribution device can be configured with at least one of the following: a distribution box, cable, distribution cabinet, motor, switch socket, lamp, air conditioner, electric water heater, electricity meter, camera, telephone, computer, etc. This power distribution device can utilize the transfer switch-related structure of this application to achieve intelligent management, but it is not limited to the above-mentioned intelligent management power distribution device; it can also be used in non-intelligent power distribution devices in traditional industries.

[0070] Furthermore, power distribution equipment can be used in smart scenarios, including smart homes, the Internet of Things industry, and many other intelligent applications, to achieve intelligent management.

[0071] Optionally, the embodiments of this application can be used for: fire protection power supply: fire control room, fire pump, smoke control and exhaust system, fire elevator and its drainage pump, fire emergency lighting, etc. (Level I); corridor lighting, duty lighting, guard lighting, obstacle marker lights; rail transit; security system power supply; electronic information computer room power supply; passenger elevator power supply; sewage pump; variable frequency speed regulation constant pressure water supply pump; main offices, conference rooms, general duty room and archives, etc.

[0072] It is understood that the above scenarios are merely examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of this application. The technical solutions of this application can also be applied to other scenarios. For example, as those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0073] The devices in the embodiments of this application can be merged, divided, and reduced according to actual needs.

[0074] In this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions are generally described in detail only when they appear for the first time. When they appear again, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions that are not described in detail later can be referred to their previous relevant detailed descriptions.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A contact assembly, characterized in that, It includes a mounting housing (100), a drive unit (200), a common stationary contact (300), a spare stationary contact (400), a neutral pole moving contact (500), and a phase pole moving contact (600); The drive unit (200), the commonly used stationary contact (300), the spare stationary contact (400), and the neutral pole moving contact (500) are all disposed in the mounting housing (100). The driving member (200) is linked with both the neutral pole moving contact (500) and the phase pole moving contact (600). The driving member (200) is used to move synchronously with the phase pole moving contact (600) and to make the neutral pole moving contact (500) move synchronously in the opposite direction to the phase pole moving contact (600) so that the neutral pole moving contact (500) contacts the normal stationary contact (300) and the spare stationary contact (400) when the phase pole moving contact (600) is open from the normal stationary contact (300) and the spare stationary contact (400). The contact assembly further includes a transmission member (700), which is movably disposed in the mounting housing (100). The drive member (200) and the neutral pole moving contact (500) are linked through the transmission member (700). The drive member (200) is used to rotate synchronously with the phase pole moving contact (600) in a first direction and drive the transmission member (700) to rotate in a second direction opposite to the first direction, so that the neutral pole moving contact (500) can be driven to move synchronously in the opposite direction to the phase pole moving contact (600) through the transmission member (700). The drive member (200) includes a first gear portion (210), and the transmission member (700) includes a second gear portion (710), wherein the first gear portion (210) meshes with the second gear portion (710).

2. The contact assembly according to claim 1, characterized in that, The phase pole moving contact (600) includes a first contact portion (610) and a second contact portion (620). When the first contact portion (610) contacts the commonly used stationary contact (300), the neutral pole moving contact (500) contacts the commonly used stationary contact (300) to be in a first state. The phase pole moving contact (600) moves along the first direction, the first contact portion (610) is disconnected from the commonly used stationary contact (300), the transmission member (700) moves synchronously with the phase pole moving contact (600), and the transmission member (700) drives the neutral pole moving contact (500) to move along the second direction to contact the commonly used stationary contact (300) and the spare stationary contact (400) to be in the second state; The phase pole moving contact (600) continues to move along the first direction, the second contact portion (620) contacts the spare stationary contact (400), the transmission member (700) moves synchronously with the phase pole moving contact (600), the transmission member (700) drives the neutral pole moving contact (500) to move along the second direction and separate from the commonly used stationary contact (300), and continues to contact the spare stationary contact (400) to be in the third state.

3. The contact assembly according to claim 2, characterized in that, The neutral pole moving contact (500) includes a connecting part (511) and a contact part (512). One end of the connecting part (511) is connected to the transmission member (700), and the other end is connected to the contact part (512). The contact part (512) is used to contact the commonly used stationary contact (300) and / or the spare stationary contact (400).

4. The contact assembly according to claim 3, characterized in that, The contact portion (512) extends in a direction perpendicular to the connecting portion (511) to form a third contact portion (5121) and a fourth contact portion (5122) that are connected to each other. In the first state, the third contact portion (5121) is in contact with the commonly used stationary contact (300); In the second state, the third contact portion (5121) contacts the spare stationary contact (400), and the fourth contact portion (5122) contacts the commonly used stationary contact (300); In the third state, the fourth contact portion (5122) contacts the spare stationary contact (400).

5. The contact assembly according to claim 3, characterized in that, The neutral polarity moving contact (500) includes two spaced-apart contact pieces (510), the connecting portion (511) and the contact portion (512) forming the contact pieces (510), and the two contact pieces (510) are used to contact the two sides of the commonly used stationary contact (300) or the spare stationary contact (400).

6. The contact assembly according to claim 5, characterized in that, The contact assembly also includes an elastic element (800) disposed in the mounting housing (100) and connected to the contact piece (510) for giving the two contact pieces (510) a tendency to move relative to each other.

7. A changeover switch, characterized in that, Includes the contact assembly as described in any one of claims 1-6.

8. A power distribution device, characterized in that, Includes the changeover switch as described in claim 7.

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