Contact assembly, change-over switch and power distribution equipment

Abstract

The invention provides a contact assembly, a change-over switch and power distribution equipment, and relates to the technical field of low-voltage electric appliances. The contact assembly comprises a mounting shell, a driving piece, a common static contact, a standby static contact, a neutral pole moving contact and a phase pole moving contact; the driving piece, the common static contact, the standby static contact, the neutral pole moving contact and the phase pole moving contact are all arranged on the mounting shell; the driving piece is connected with the phase pole moving contact and the neutral pole moving contact and is used for enabling the phase pole moving contact and the neutral pole moving contact to synchronously and reversely move, so that the phase pole moving contact is in contact with the common static contact or the standby static contact; and the neutral pole moving contact is contacted with the common static contact and the standby static contact under the condition that the phase pole moving contact is separated from the common static contact and the standby static contact, so that the potential safety hazard caused by a null line flying phenomenon is eliminated, the structure is simple, the number of parts is small, the action is reliable, the contact opening distance is large, and the design requirements of miniaturization and modularization of products are met.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and more specifically, to a contact assembly, a transfer switch, and a power distribution device. Background Art

[0002] The four-pole automatic transfer switch electrical appliance includes a neutral pole unit and a phase pole unit. Both the neutral pole unit and the phase pole unit rotate between two static contacts through a moving contact assembly, so as to respectively contact the normal or standby power supply static contacts, thereby realizing the switching between the normal power supply and the standby power supply.

[0003] Currently, during the conversion process of the transfer switch, the other power supply is closed only after one power supply is completely cut off. Although this ensures the complete isolation of the two power supplies and avoids the short-circuit phenomenon between the two power supplies, during the conversion process, the neutral line at the load end is completely disconnected, resulting in the phenomenon of the zero line being vacated, thereby causing damage to the power distribution device. Summary of the Invention

[0004] The present invention provides a contact assembly, a transfer switch, and a power distribution device, which can eliminate the potential safety hazards caused by the zero line vacating phenomenon.

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

[0006] In a first aspect, the present invention provides a contact assembly, including a mounting housing, a driving member, a normal static contact, a standby static contact, a neutral pole moving contact, and a phase pole moving contact;

[0007] The driving member, the normal static contact, the standby static contact, the neutral pole moving contact, and the phase pole moving contact are all arranged 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 make the neutral pole moving contact move synchronously and in the opposite direction relative to the phase pole moving contact, so that the neutral pole moving contact contacts the normal static contact and the standby static contact when the phase pole moving contact is separated from the normal static contact and the standby static contact.

[0009] In an optional embodiment, the contact assembly further includes a transmission member, the transmission member is movably arranged in the mounting housing, the driving member and the neutral pole moving contact are linked through the transmission member, the driving member is used to rotate synchronously with the phase pole 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 pole moving contact to move synchronously and in the opposite direction relative to the phase pole moving contact through the transmission member.

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

[0011] In an alternative embodiment, the phase pole moving contact includes a first contact portion and a second contact portion. When the first contact portion contacts the normal static contact, the neutral pole moving contact contacts the normal static contact to present a first state.

[0012] The phase pole moving contact moves in a first direction, the first contact portion separates from the normal static contact, the transmission member moves synchronously with the phase pole moving contact, and the transmission member drives the neutral pole moving contact to move in a second direction to contact the normal static contact and the standby static contact to present a second state.

[0013] The phase pole moving contact continues to move in the first direction, the second contact portion contacts the standby static contact, the transmission member moves synchronously with the phase pole moving contact, and the transmission member drives the neutral pole moving contact to move in the second direction to separate from the normal static contact and continuously contact the standby static contact to present a third state.

[0014] In an alternative embodiment, the neutral pole 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 normal static contact and / or the standby static contact.

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

[0016] In the first state, the third contact portion contacts the normal static contact.

[0017] In the second state, the third contact portion contacts the standby static contact, and the fourth contact portion contacts the normal static contact.

[0018] In the third state, the fourth contact portion contacts the standby static contact.

[0019] In an alternative embodiment, the neutral pole moving contact includes two spaced-apart contact pieces. The connecting portion and the contact portion form the contact pieces, and the two contact pieces are used to contact both sides of the normal static contact or the standby static contact.

[0020] In an alternative embodiment, the contactor assembly further includes an elastic member. The elastic member is disposed on the mounting housing and connected to the contact piece, and is used to make the two contact pieces have a tendency of relative movement.

[0021] In a second aspect, the present invention provides a change-over switch, including the contact assembly according to any one of the foregoing embodiments.

[0022] In a third aspect, the present invention provides a power distribution device, including the change-over switch according to the foregoing embodiment.

[0023] The beneficial effects of the contact assembly, change-over switch, and power distribution device provided by the embodiments of the present invention include: by means of a driving member, the phase pole moving contact and the neutral pole moving contact move synchronously and in opposite directions, so that during the process in which the phase pole moving contact is in the off state with both the normal static contact and the standby static contact, the neutral pole moving contact contacts the normal static contact and the standby static contact simultaneously, so as to ensure that the neutral pole moving contact is connected to at least one of the normal power supply and the standby power supply, thereby ensuring that during the conversion process of the change-over switch, the neutral line at the load end is always connected and will not be completely disconnected, that is, the output neutral line of the change-over switch is always connected to the neutral line of the input power grid, thereby eliminating the safety hazard caused by the phenomenon of the neutral line being lifted. At the same time, the contact assembly also has the advantages of simple structure, few components, reliable operation, and large contact opening distance, meeting the design requirements of product miniaturization and modularization. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

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

[0026] Figure 2 Another schematic structural diagram of the contact assembly provided by the embodiment of the present invention in the first state;

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

[0028] Figure 4 Another schematic structural diagram of the contact assembly provided by the embodiment of the present invention in the second state;

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

[0030] Figure 6 Another schematic structural diagram of the contact assembly provided by the embodiment of the present invention in the third state;

[0031] Figure 7Exploded view of a partial structure of the contact component provided by an embodiment of the present invention.

[0032] Icon: 10 - Contact component; 100 - Mounting housing; 200 - Driving member; 210 - First gear portion; 300 - Normal static contact; 400 - Spare static contact; 500 - Neutral pole moving contact; 510 - Contact piece; 511 - Connecting portion; 512 - Contact portion; 5121 - Third contact portion; 5122 - Fourth contact portion; 600 - Phase pole moving contact; 610 - First contact portion; 620 - Second contact portion; 700 - Transmission member; 710 - Second gear portion; 800 - Elastic member. Detailed implementation manners

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

[0034] 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 claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] In addition, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0038] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0039] The four-pole automatic transfer switch electrical appliance includes a neutral pole unit and a phase pole unit. Both the neutral pole unit and the phase pole unit rotate between two static contacts through a moving contact assembly, so as to contact the normal or standby power supply static contacts respectively, realizing the switching between the normal power supply and the standby power supply.

[0040] Currently, during the conversion process of the transfer switch, one power supply is completely cut off before closing the other power supply. Although this ensures the complete isolation of the two power supplies and avoids the short-circuit phenomenon between the two power supplies, during the conversion process, the neutral line at the load end is completely disconnected, resulting in the phenomenon of the neutral line being vacated, which may cause damage to the power distribution equipment. And many existing power distribution systems do not allow the neutral point to be disconnected during the conversion process.

[0041] Therefore, to solve the above problems, the present invention provides a transfer switch, which can make the N phase always keep in contact with the normal or standby neutral line during the conversion process of the dual power supply, and after the conversion of the ABC phases is completed, the N phase is also synchronously converted. Among them, the transfer switch includes a contact assembly.

[0042] Please refer to Figures 1 to 7 , the contact assembly 10 includes a mounting housing 100, a driving member 200, a normal static contact 300, a standby static contact 400, a neutral pole moving contact 500 and a phase pole moving contact 600.

[0043] Among them, the driving member 200, the normal static contact 300, the standby static contact 400, the neutral pole moving contact 500 and the phase pole moving contact 600 are all arranged in the mounting housing 100; among them, 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 make the neutral pole moving contact 500 move synchronously and reversely relative to the phase pole moving contact 600. The driving member 200 is used to drive the neutral pole moving contact 500 and the phase pole moving contact 600 to move synchronously and reversely, so that the phase pole moving contact 600 contacts the normal static contact 300 or the standby static contact 400, so that the neutral pole moving contact 500 is used to contact the normal static contact 300 and the standby static contact 400 when the phase pole moving contact 600 is separated from the normal static contact 300 and the standby static contact 400; in short, that is, the neutral pole moving contact 500 and the phase pole moving contact 600 are made to move synchronously and reversely through the driving member 200.

[0044] In this embodiment, the driving member 200 is connected to the phase-pole moving contact 600 and moves synchronously therewith, and is used to rotate the phase-pole moving contact 600 relative to the mounting housing 100 and bring it into contact with the normal static contact 300 or the standby static contact 400. It should be noted here that the driving member 200 is usually connected to a motor or other moving mechanism to rotate under the drive of the motor or other moving mechanism; in addition, the driving member 200 and the phase-pole moving contact 600 are integrally formed, and the driving member 200 and the phase-pole moving contact 600 may also be two independent parts, which are not specifically limited herein.

[0045] The driving member 200 is also connected to the neutral-pole moving contact 500 and moves synchronously therewith, and is used to make the neutral-pole moving contact 500 move synchronously and in the opposite direction relative to the phase-pole moving contact 600, so that the neutral-pole moving contact 500 contacts the normal static contact 300 and the standby static contact 400 when the phase-pole moving contact 600 is separated from the normal static contact 300 and the standby static contact 400.

[0046] It should be noted that the normal static contact 300 includes a normal neutral-pole static contact and a normal phase-pole static contact, and the standby static contact 400 includes a standby neutral-pole static contact and a standby phase-pole static contact. Therefore, the contact between the phase-pole moving contact 600 and the normal static contact 300 or the standby static contact 400 described in this article all refers to: the phase-pole moving contact 600 contacts the normal phase-pole static contact or the standby phase-pole static contact; similarly, the contact between the neutral-pole moving contact 500 and the normal static contact 300 or the standby static contact 400 all refers to: the neutral-pole moving contact 500 contacts the normal neutral-pole static contact or the standby neutral-pole static contact. For the sake of brief description, only the normal static contact 300 and the standby static contact 400 are mentioned below.

[0047] In this embodiment, by synchronously rotating the driving member 200 and the phase-pole moving contact 600, the phase-pole moving contact 600 is closed with the normal static contact 300, so that the normal power supply is connected; the driving member 200 can also move synchronously with the phase-pole moving contact 600, so that the phase-pole moving contact 600 is closed with the standby static contact 400, so that the standby power supply is connected. Therefore, by rotating the phase-pole moving contact 600, the change-over switch is switched between the normal power supply and the standby power supply, providing an uninterrupted power supply for the load, and further ensuring the continuity of power supply.

[0048] While the phase pole moving contact 600 rotates, the driving member 200 rotates synchronously with the neutral pole moving contact 500. Thus, during the process of the phase pole moving contact 600 switching between the normal power supply and the standby power supply, that is, during the process when the phase pole moving contact 600 is in the open state with both the normal static contact 300 and the standby static contact 400, the neutral pole moving contact 500 contacts the normal static contact 300 and the standby static contact 400 while the driving member 200 moves synchronously, so as to ensure that the neutral pole moving contact 500 is connected to at least one of the normal power supply and the standby power supply. Thereby, it is ensured that during the conversion process of the transfer switch, the neutral line at the load end is always connected and will not be completely disconnected, that is, the output neutral line of the transfer switch is always connected to the neutral line of the input power grid, thus eliminating the safety hazard caused by the phenomenon of the neutral line being empty. Meanwhile, the contact assembly 10 also has the advantages of simple structure, few components, reliable operation, and large contact opening distance, meeting the design requirements of product miniaturization and modularization.

[0049] Furthermore, the contact assembly 10 further includes a transmission member 700. The transmission member 700 is movably arranged in the installation housing 100 and is connected to the driving 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 driving member 200. The driving member 200 is used to drive the phase pole moving contact 600 to rotate synchronously along a first direction (for example, clockwise), and drive the transmission member 700 to rotate along a second direction opposite to the first direction (for example, counterclockwise), so as to drive the neutral pole moving contact 500 to move synchronously and in the opposite direction relative to the phase pole moving contact 600.

[0050] In this embodiment, by setting the transmission member 700 to be connected to the driving member 200, and through the synchronous rotation of the neutral pole moving contact 500 and the phase pole moving contact 600, it is thus realized that the neutral pole moving contact 500 always contacts the normal static contact 300 and the standby static contact 400 during the conversion process, and after the phase pole moving contact 600 completes the conversion, the transmission member 700 drives the neutral pole moving contact 500 to complete the conversion synchronously.

[0051] It can be understood that the transmission member 700 can be a gear structure, a rack structure, or a link mechanism, etc., as long as it can meet the above requirements.

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

[0053] In this embodiment, the first gear portion 210 meshes with the second gear portion 710 to enable the phase pole moving contact 600 to rotate clockwise. Meanwhile, the driving member 700 drives the neutral pole moving contact 500 to rotate counterclockwise; or when the phase pole moving contact 600 rotates counterclockwise, the driving member 700 drives the neutral pole moving contact 500 to rotate clockwise.

[0054] Further, the phase pole moving contact 600 includes a first contact portion 610 and a second contact portion 620. As Figure 1 and Figure 2 shown, the driving member 200 is used to drive the first contact portion 610 to contact the normal static contact 300, and the second contact portion 620 to separate from the standby static contact 400, and drive the driving member 700 to drive the neutral pole moving contact 500 to contact the normal static contact 300 and separate from the standby contact head, so as to present a first state. In this case, the normal power supply supplies power to the load.

[0055] As Figure 3 and Figure 4 shown, the driving member 200 is further used to drive both the first contact portion 610 and the second contact portion 620 to separate from the normal static contact 300 and the standby static contact 400, and drive the driving member 700 to drive the neutral pole moving contact 500 to contact the normal static contact 300 and the standby static contact 400, so as to present a second state.

[0056] As Figure 5 and Figure 6 shown, the driving member 200 is further used to drive the second contact portion 620 to contact the standby static contact 400, and the first contact portion 610 to separate from the normal static contact 300, and drive the neutral pole moving contact 500 to contact the standby static contact 400, so as to present a third state. In this case, the standby power supply supplies power to the load.

[0057] Therefore, through the above settings, it is realized that after the phase pole moving contact 600 completes the conversion, the neutral pole moving contact 500 synchronously completes the conversion; and it is ensured that in the double-break state, the neutral pole moving contact 500 contacts both the normal static contact 300 and the standby static contact 400 at the same time, so as to ensure that the neutral pole moving contact 500 is connected to at least one of the normal power supply and the standby power supply, thereby ensuring that during the conversion process of the transfer switch, the neutral line at the load end is always connected and will not be completely disconnected, that is, the output neutral line of the transfer switch is always connected to the neutral line of the input power grid, thus eliminating the safety hazard caused by the phenomenon of the neutral line being vacated.

[0058] Further, 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 driving member 700, and the other end is connected to the contact portion 512. The contact portion 512 is used to contact the normal static contact 300 and / or the standby static contact 400.

[0059] In this embodiment, the connecting portion 511 can rotate around the rotation center of the transmission member 700 driven by the transmission member 700, so that the contact portion 512 is driven by the connecting portion 511 to contact the normal static contact 300, or contact the standby static contact 400, or contact both the normal static contact 300 and the standby static contact 400 simultaneously.

[0060] Further, the contact portion 512 extends in a direction perpendicular to the connecting portion 511 to form a connected third contact portion 5121 and a fourth contact portion 5122, so that the neutral pole moving contact 500 is in a T shape.

[0061] In the first state, the third contact portion 5121 contacts the normal static contact 300;

[0062] In the second state, the third contact portion 5121 contacts the standby static contact 400, and the fourth contact portion 5122 contacts the normal static 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 normal static contact 300 and the standby contact head simultaneously.

[0063] In the third state, the fourth contact portion 5122 contacts the standby static contact 400.

[0064] Further, 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 piece 510. The two contact pieces 510 are used to contact both sides of the normal static contact 300 or the standby static contact 400. That is to say, the neutral pole moving contact 500 contacts the normal static contact 300 or the standby static contact 400 in a clamping manner. Compared with the existing clapper-type contact structure, the phenomenon that the neutral line is repelled by a large current and the zero line is vacated can be avoided.

[0065] Further, the contact component 10 further includes an elastic member 800. The elastic member 800 is disposed on the mounting housing 100 and connected to the contact piece 510, and is used to make the two contact pieces 510 have a tendency of relative movement.

[0066] In this embodiment, the number of the elastic members 800 is two. The two elastic members 800 act on the two contact pieces 510 respectively, which is beneficial to making the two contact pieces 510 contact the static contact stably, thereby improving the closing stability.

[0067] Optionally, the elastic member 800 is a spring plate.

[0068] In summary, the embodiment of the present invention provides a contact assembly 10 and a transfer switch. During the process of the phase pole moving contact 600 being in the open position with both the normal static contact 300 and the standby static contact 400, the neutral pole moving contact 500 contacts the normal static contact 300 and the standby static contact 400 while synchronously moving under the drive of the driving member 200, so as to ensure that the neutral pole moving contact 500 is connected to at least one of the normal power supply and the standby power supply, thereby ensuring that the neutral line at the load end is always connected and will not be completely disconnected during the conversion process of the transfer switch, that is, the output neutral line of the transfer switch is always connected to the neutral line of the input power grid, thus eliminating the safety hazard caused by the phenomenon of the neutral line becoming empty. At the same time, the contact assembly 10 also has the advantages of simple structure, few components, reliable operation, and large contact opening distance, meeting the design requirements of product miniaturization and modularization.

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

[0070] Moreover, the power distribution device can be applied to intelligent scenarios, such as smart home, Internet of Things industry, and more intelligent scenarios, to achieve intelligent management.

[0071] Optionally, the embodiment of the present application can be used for: fire protection power supply: such as the first-level power supply for fire control rooms, fire pumps, smoke prevention and exhaust facilities, fire elevators and their drainage pumps, fire emergency lighting, etc.; aisle lighting, duty lighting, guard lighting, obstacle marker lights; rail transit; security system power supply; electronic information machine room power supply; passenger elevator power; sewage pump; variable frequency speed regulation constant pressure water supply domestic pump; main offices, meeting rooms, general duty rooms, archives, etc.

[0072] It can be understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solution provided by the embodiment of the present application. The technical solution of the present application can also be applied to other scenarios. For example, as is known to those of ordinary skill in the art, with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present application is equally applicable to similar technical problems.

[0073] The devices in the embodiment of the present application can be combined, divided, and deleted according to actual needs.

[0074] In this application, for the description of the same or similar term concepts, technical solutions, and / or application scenarios, generally only the first occurrence is described in detail. When it appears repeatedly later, for the sake of brevity, it is generally not described again. When understanding the technical solutions and other contents of this application, for the same or similar term concepts, technical solutions, and / or application scenarios that are not described in detail later, reference can be made to the relevant detailed descriptions before them.

[0075] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A contact component, characterized in that, It includes an installation housing (100), a driving member (200), a common static contact (300), a spare static contact (400), a neutral pole moving contact (500), and a phase pole moving contact (600); The driving member (200), the common static contact (300), the spare static contact (400), and the neutral pole moving contact (5) are all arranged in the installation 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 make the neutral pole moving contact (500) move synchronously and in the opposite direction relative to the phase pole moving contact (600), so that the neutral pole moving contact (500) contacts the common static contact (300) and the spare static contact (400) when the phase pole moving contact (600) is separated from the common static contact (300) and the spare static contact (400).

2. The contact assembly according to claim 1, wherein, The contact assembly further includes a transmission member (700). The transmission member (700) is movably arranged in the installation housing (100). The driving member (200) and the neutral pole moving contact (500) are linked through the transmission member (700). The driving member (200) is used to rotate synchronously with the phase pole moving contact (600) along a first direction, and drive the transmission member (700) to rotate along a second direction opposite to the first direction, so as to drive the neutral pole moving contact (500) to move synchronously and in the opposite direction relative to the phase pole moving contact (600) through the transmission member (700).

3. The contact assembly according to claim 2, wherein, [[ID=I]]The driving member (200) includes a first gear portion (210), and the transmission member (700) includes a second gear portion (710). The first gear portion (210) meshes with the second gear portion (710).

4. The contact assembly according to claim 2, 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 common static contact (300), the neutral pole moving contact (500) contacts the common static contact (300) to present a first state; The phase pole moving contact (600) moves along the first direction, the first contact portion (610) is separated from the common static 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 common static contact (300) and the spare static contact (400) to present a second state; The phase pole moving contact (600) continues to move in the first direction, the second contact part (620) contacts the spare static 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 in the second direction to separate from the normal static contact (300), and continuously contacts the spare static contact (400) to present a third state.

5. The contact component according to claim 4, 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 normal static contact (300) and / or the spare static contact (400).

6. The contact component according to claim 5, characterized in that, The contact part (512) extends in a direction perpendicular to the connecting part (511) to form a connected third contact part (5121) and fourth contact part (5122); In the first state, the third contact part (5121) contacts the normal static contact (300); In the second state, the third contact part (5121) contacts the spare static contact (400), and the fourth contact part (5122) contacts the normal static contact (300); In the third state, the fourth contact part (5122) contacts the spare static contact (400).

7. The contact assembly according to claim 5, wherein, The neutral pole moving contact (500) includes two spaced-apart contact pieces (510). The connecting part (511) and the contact part (512) form the contact piece (510). The two contact pieces (510) are used to contact both sides of the normal static contact (300) or the spare static contact (400).

8. The contact component according to claim 7, characterized in that The contact assembly further includes an elastic member (800). The elastic member (800) is disposed on the mounting housing (100) and connected to the contact piece (510) for making the two contact pieces (510) have a tendency of relative movement.

9. A change-over switch, characterized in that, It includes the contact assembly according to any one of claims 1-8.

10. A power distribution device, characterized in that, It includes the change-over switch according to claim 9.

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