Arc extinguishing device and power supply automatic change-over switch

Abstract

The utility model discloses an arc-extinguishing device and a power supply automatic change-over switch, the arc-extinguishing device comprises two arc-extinguishing chambers which are symmetrically arranged back to back, and each arc-extinguishing chamber comprises an insulating separator plate structure and a plurality of arc-extinguishing grid sheets. A cavity is formed in the partition plate structure and provided with an arc inlet notch, and the arc inlet notch comprises a first notch part and a second notch part. The opening directions of the first gap parts of the two arc extinguish chambers are opposite, and the opening directions of the second gap parts of the two arc extinguish chambers are the same. And a plurality of arc extinguishing grid sheets are arranged and installed in the cavity. The arc extinguishing device is simple in structure, easy to assemble and small in space layout, achieves the purpose of reducing materials and cost, and is suitable for batch production.

Description

TECHNICAL FIELD

[0001] The utility model relates to arc chamber technical field especially, relates to a kind of arc extinguishing device and power automatic transfer switch. BACKGROUND

[0002] Double power automatic transfer switch is a kind of low-voltage appliance in production, life, is often used in important power distribution occasions, for monitoring power supply circuit (common power supply and standby power supply or power supply), when one power supply is monitored to appear deviation (overvoltage, undervoltage, loss of voltage or open phase), automatically switch to another normal power supply, ensure the continuity of power supply.

[0003] The double power automatic transfer switch of related art, most structural forms are that one operation conversion mechanism drives multipolar body switch (maximum 4 poles) to realize the switching of two power supplies by shaft.Breaking when the moving contact and static contact in body switch during switching process, current path is suddenly interrupted, and arc hazard that switch equipment is difficult to bear is generated, so arc chamber is important and necessary component in entire automatic transfer switch.

[0004] The arc chamber in current double power automatic transfer switch often adopts one arc extinguishing grid piece including one power supply moving contact and static contact assembly, first, arc generated when automatic transfer switch switches will seriously ablate the main moving contact of adjacent position, cause the service life of complete machine to shorten, performance is seriously reduced.Second, due to the influence of space layout, the opening distance of moving contact assembly is reduced, and the arc extinguishing effect is further deteriorated.Finally, this design layout will undoubtedly increase the size of arc extinguishing grid piece, resulting in material waste and increased space layout. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is that, in view of at least one defect of related art mentioned in the above background art: the arc chamber of related art can cause material waste, increased space layout, and a kind of arc extinguishing device and power automatic transfer switch are provided.

[0006] The technical scheme adopted by the utility model to solve its technical problem is: a kind of arc extinguishing device is constructed, including two arc chambers that are symmetrically arranged opposite, the arc chamber includes:

[0007] Insulating baffle structure, the baffle structure is formed with chamber, the chamber has arc entry gap, the arc entry gap includes first gap part and second gap part;The opening direction of the first gap part of two arc chambers is opposite, and the opening direction of the second gap part of two arc chambers is same;And,

[0008] Multiple arc extinguishing grid pieces, multiple arc extinguishing grid pieces are arranged and installed in the chamber.

[0009] In some embodiments, the plurality of arc-extinguishing grid pieces are arranged in a stepped manner, and the extension planes of the arc-extinguishing grid pieces correspond to the first gap portion.

[0010] In some embodiments, the arc-extinguishing grid pieces are provided with gaps, and the gaps are directed towards the second gap portion.

[0011] The gaps of the plurality of arc-extinguishing grid pieces are arranged in a stepped manner away from the first gap portion and gradually approach the second gap portion.

[0012] In some embodiments, the partition structure comprises:

[0013] The first arc-extinguishing partition, the second arc-extinguishing partition, and the third arc-extinguishing partition are oppositely arranged, the third arc-extinguishing partition is an L-shaped structure, and is connected between the first arc-extinguishing partition and the second arc-extinguishing partition; the first arc-extinguishing partition, the second arc-extinguishing partition, and the third arc-extinguishing partition jointly define the chamber with the arc-entering gap.

[0014] The utility model further constructs a kind of power automatic transfer switch, including the arc-extinguishing device of any one described above.

[0015] In some embodiments, the power automatic transfer switch further comprises:

[0016] A load connecting piece is used to connect a load terminal, and the load connecting piece is provided with a load static contact on both sides.

[0017] A first moving contact assembly is used to connect a first power terminal, and the first moving contact assembly is located at the opening direction of the first gap portion of one arc-extinguishing chamber of the arc-extinguishing device, and partially extends into the corresponding arc-extinguishing chamber; and,

[0018] A second moving contact assembly is used to connect a second power terminal, and the second moving contact assembly is located at the opening direction of the first gap portion of another arc-extinguishing chamber of the arc-extinguishing device, and partially extends into the corresponding arc-extinguishing chamber.

[0019] The power automatic transfer switch has a double-break state, a first closed state and a second closed state.

[0020] When the power automatic transfer switch is in the first closed state, the first moving contact assembly is connected with the load static contact on the corresponding side of the load connecting piece, and the second moving contact assembly is disconnected with the load static contact on the corresponding side of the load connecting piece.

[0021] When the power automatic transfer switch is in the second closed state, the first movable contact assembly is disconnected from the load static contact on the corresponding side of the load connection, and the second movable contact assembly is connected to the load static contact on the corresponding side of the load connection.

[0022] When the power automatic transfer switch is in the double split state, the first movable contact assembly and the second movable contact assembly are disconnected from the load static contact of the load connection.

[0023] In some embodiments, the power automatic transfer switch further comprises:

[0024] An arc striking member is arranged in each of the two arc extinguishing chambers, and the arc striking member is fixed to the load connection.

[0025] The first movable contact assembly and the second movable contact assembly each comprise:

[0026] A main movable contact is arranged outside the arc extinguishing chamber, and the main movable contact is used to connect or disconnect the load static contact on the corresponding side of the load connection; and

[0027] A movable arc striking contact is arranged in the arc extinguishing chamber and can move in the arc extinguishing chamber, and the movable arc striking contact is used to connect or disconnect the arc striking member in the corresponding arc extinguishing chamber, and the arc striking member is used to guide the arc generated when the movable arc striking contact is disconnected away from the movable arc striking contact.

[0028] In some embodiments, the arc striking member comprises:

[0029] An arc striking static contact is used to connect or disconnect the movable arc striking contact; and

[0030] An arc striking sheet extends from the arc striking static contact to the position of the arc extinguishing grid farthest from the first gap in the arc extinguishing chamber.

[0031] In some embodiments, the arc striking static contact is arranged horizontally, and the load static contact of the load connection is arranged obliquely.

[0032] In some embodiments, the length of the movable arc striking contact is greater than the length of the main movable contact.

[0033] By implementing the utility model, the following beneficial effects are achieved:

[0034] The arc extinguishing device has the advantages of simple structure, easy assembly, small space layout, and the purpose of reducing material and cost is achieved, and is suitable for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0035] The utility model will be further described below with reference to the drawings and embodiments, and the drawings show:

[0036] Figure 1 A structural diagram of one embodiment of the arc extinguishing device is shown;

[0037] Figure 2 A left view of one embodiment of the arc extinguishing device is shown;

[0038] Figure 3 A right view of one embodiment of the arc extinguishing device is shown;

[0039] Figure 4 A structural diagram of one embodiment of the power automatic transfer switch is shown;

[0040] Figure 5 A structural diagram of one embodiment of the movable contact assembly of the power automatic transfer switch is shown. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "link", "connection", "set in", "located" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be chemical connection, can be direct connection, also can through the intermediate medium indirectly connect, can be two element inside the intercommunication. For ordinary skilled person in the art, the above-mentioned term can be understood by the specific meaning in the utility model through specific circumstances.

[0045] The function of the arc extinguishing chamber is to provide a closed space when the contact is disconnected, so that the arc can be rapidly cooled and extinguished in the limited space, thereby protecting the switch device from damage and ensuring the safety of operation.

[0046] As Figure 1 shown, some embodiments of the utility model disclose an arc extinguishing device 1 applied to automatic transfer switch, the arc extinguishing device 1 includes two arc extinguishing chambers 11 that are symmetrically arranged opposite to each other, and the two arc extinguishing chambers 11 respectively include: insulating baffle structure 111 and multiple arc extinguishing louver sheets 113, and it can be understood that multiple pieces can be two, three or any number, as follows:

[0047] The baffle structure 111 is formed with a chamber 112, and the chamber 112 has an arc inlet gap 1121, and the arc inlet gap 1121 includes a first gap part 1121a and a second gap part 1121b. The opening directions of the first gap parts 1121a of the two arc extinguishing chambers 11 are opposite, and the opening directions of the second gap parts 1121b of the two arc extinguishing chambers 11 are the same. The multiple arc extinguishing louver sheets 113 are arranged and installed in the chamber 112.

[0048] The arc extinguishing device 1 is simple in structure, easy to assemble, small in space layout, realizes the purpose of reducing material and cost, and is suitable for mass production.

[0049] It needs to be explained here that the arc inlet gap 1121 is a complete through gap, so the first gap part 1121a and the second gap part 1121b are adjacent and communicated, specifically, the first gap part 1121a and the second gap part 1121b are located on the two adjacent sides of the chamber 112, for example, the opening direction of the first gap part 1121a is perpendicular to the opening direction of the second gap part 1121b, forming an "L" type arc inlet gap 1121.

[0050] Some embodiments, as Figure 1 , Figure 2 and Figure 3 shown, the multiple arc extinguishing louver sheets 113 are arranged in steps, and the extension surface of the arc extinguishing louver sheet 113 corresponds to the first gap part 1121a. For example, the extension surface of the arc extinguishing louver sheet 113 is a plane, and is parallel to the plane where the first gap part 1121a is located.

[0051] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , the arc-extinguishing grid sheet 113 is provided with a notch 1131, and the notch 1131 faces the second notch part 1121b. The notches 1131 of the plurality of arc-extinguishing grid sheets 113 are arranged in a stepped manner in a direction away from the first notch part 1121a and gradually approach the second notch part 1121b.

[0052] In some embodiments, as shown in Figure 1 , the baffle structure 111 includes a first arc-extinguishing baffle 1111, a second arc-extinguishing baffle 1112, and a third arc-extinguishing baffle 1113. The first arc-extinguishing baffle 1111 and the second arc-extinguishing baffle 1112 are oppositely arranged, and the third arc-extinguishing baffle 1113 is an L-shaped structure connected between the first arc-extinguishing baffle 1111 and the second arc-extinguishing baffle 1112. The first arc-extinguishing baffle 1111, the second arc-extinguishing baffle 1112, and the third arc-extinguishing baffle 1113 jointly define a chamber 112 with an arc-entering notch 1121, specifically a rectangular chamber 112 and an L-shaped arc-entering notch 1121.

[0053] In some embodiments, as shown in Figure 1 , the arc-extinguishing grid sheet 113 is connected to the first arc-extinguishing baffle 1111 and the second arc-extinguishing baffle 1112. For example, the arc-extinguishing grid sheet 113 is riveted to the first arc-extinguishing baffle 1111 and the second arc-extinguishing baffle 1112. Here, the riveting is only an example and does not limit the present application, and other methods can also be used.

[0054] In some embodiments, as shown in Figure 1 , the arc-extinguishing device 1 further includes a fourth arc-extinguishing baffle 1114. The first arc-extinguishing baffles 1111 of the two arc-extinguishing chambers 11 are connected to the fourth arc-extinguishing baffle 1114. For example, the first arc-extinguishing baffles 1111 of the two arc-extinguishing chambers 11 are connected to the fourth arc-extinguishing baffle 1114 by nut lock, and here the nut lock is only an example and does not limit the present application, and other methods can also be used.

[0055] In some embodiments, the first arc-extinguishing baffle 1111, the second arc-extinguishing baffle 1112, the third arc-extinguishing baffle 1113, and the fourth arc-extinguishing baffle 1114 are plate bodies made of flame-resistant materials, such as melamine plates or red steel paper plates, and here the melamine plates and red steel paper plates are only examples and do not limit the present application, and other materials can also be used.

[0056] In some embodiments, as shown in Figure 1As shown, a plurality of openings 1113a are arranged on the partition structure 111 opposite to the second notch part 1121b, specifically on the third arc-extinguishing partition 1113. The plurality of openings 1113a are of the same size and are uniformly distributed, and the high-temperature and high-pressure gas after instantaneous expansion can be discharged through the plurality of openings 1113a when the arc is generated, thereby ensuring the normal state of the operation of the automatic transfer switch. For example, the opening 1113a is a circular hole, which is merely an example and does not limit the present application, and can also be other forms.

[0057] As shown in the drawings, Figure 4 Some embodiments of the utility model disclose an automatic transfer switch, specifically a double automatic transfer switch, which comprises the arc-extinguishing device 1 of any one of the above-mentioned embodiments.

[0058] Some embodiments, as shown in the drawings, Figure 4 The automatic transfer switch further comprises a load connecting piece 2, a first movable contact assembly 3a and a second movable contact assembly 3b, and specifically as follows:

[0059] The load connecting piece 2 is used for connecting a load terminal, and the load connecting piece 2 is provided with a load static contact 21 on both sides.

[0060] The first movable contact assembly 3a is used for connecting a first power terminal, and the first movable contact assembly 3a is located at the opening direction of the first notch part 1121a of one of the arc-extinguishing chambers 11 of the arc-extinguishing device 1 and partially extends into the corresponding arc-extinguishing chamber 11.

[0061] The second movable contact assembly 3b is used for connecting a second power terminal, and the second movable contact assembly 3b is located at the opening direction of the first notch part 1121a of the other arc-extinguishing chamber 11 of the arc-extinguishing device 1 and partially extends into the corresponding arc-extinguishing chamber 11.

[0062] The automatic transfer switch has a double-break state, a first closed state and a second closed state, and specifically as follows:

[0063] When the automatic transfer switch is in the first closed state, the first movable contact assembly 3a is connected with the load static contact 21 on the corresponding side of the load connecting piece 2, and the second movable contact assembly 3b is disconnected with the load static contact 21 on the corresponding side of the load connecting piece 2.

[0064] When the automatic transfer switch is in the second closed state, the first movable contact assembly 3a is disconnected with the load static contact 21 on the corresponding side of the load connecting piece 2, and the second movable contact assembly 3b is connected with the load static contact 21 on the corresponding side of the load connecting piece 2.

[0065] When the automatic transfer switch is in the double-break state, the first movable contact assembly 3a and the second movable contact assembly 3b are both disconnected with the load static contact 21 on the corresponding side of the load connecting piece 2.

[0066] Exemplarily, as shown in the orientation, Figure 4 Exemplarily, as shown in the orientation,

[0067] In some embodiments, as shown in the orientation, Figure 4 Exemplarily, as shown in the orientation,

[0068] In some embodiments, as shown in the orientation, Figure 4 Figure 4

[0069] In some embodiments, as shown in the orientation, Figure 4

[0070] Figure 4 Figure 5 ​​​​​As shown, the first moving contact assembly 3a and the second moving contact assembly 3b each include a main moving contact 31 and a moving arc striking contact 32. The main moving contact 31 is located outside the arc extinguishing chamber 11 and is used to connect or disconnect with the load static contact 21 on the corresponding side of the load connecting member 2. The moving arc striking contact 32 is located inside the arc extinguishing chamber 11 and is movable within the arc extinguishing chamber 11, and is used to connect or disconnect with the arc striking member 4 in the corresponding arc extinguishing chamber 11. The arc striking member 4 is used to guide the arc generated when the moving arc striking contact 32 is disconnected to be away from the moving arc striking contact 32, thereby maximizing the service life of the moving arc striking contact 32 and the main moving contact 31.

[0071] When the power automatic transfer switch is in the first closed state, the main moving contact 31 of the first moving contact assembly 3a is connected with the load static contact 21 on the corresponding side of the load connecting member 2, the moving arc striking contact 32 of the first moving contact assembly 3a is connected with the arc striking member 4 in the corresponding arc extinguishing chamber 11, the main moving contact 31 of the second moving contact assembly 3b is disconnected with the load static contact 21 on the corresponding side of the load connecting member 2, and the moving arc striking contact 32 of the second moving contact assembly 3b is disconnected with the arc striking member 4 in the corresponding arc extinguishing chamber 11.

[0072] When the power automatic transfer switch is in the second closed state, the main moving contact 31 of the first moving contact assembly 3a is disconnected with the load static contact 21 on the corresponding side of the load connecting member 2, the moving arc striking contact 32 of the first moving contact assembly 3a is disconnected with the arc striking member 4 in the corresponding arc extinguishing chamber 11, the main moving contact 31 of the second moving contact assembly 3b is connected with the load static contact 21 on the corresponding side of the load connecting member 2, and the moving arc striking contact 32 of the second moving contact assembly 3b is connected with the arc striking member 4 in the corresponding arc extinguishing chamber 11.

[0073] When the power automatic transfer switch is in the second closed state, the main moving contact 31 of the first moving contact assembly 3a is disconnected with the load static contact 21 on the corresponding side of the load connecting member 2, the moving arc striking contact 32 of the first moving contact assembly 3a is disconnected with the arc striking member 4 in the corresponding arc extinguishing chamber 11, the main moving contact 31 of the second moving contact assembly 3b is connected with the load static contact 21 on the corresponding side of the load connecting member 2, and the moving arc striking contact 32 of the second moving contact assembly 3b is connected with the arc striking member 4 in the corresponding arc extinguishing chamber 11.

[0074] In some embodiments, the moving arc striking contact 32 extends into the arc extinguishing chamber 11 from the arc striking gap 1121 and is swingable in the direction from the first gap portion 1121a to the second gap portion 1121b.

[0075] In some embodiments, as shown in FIG. 2, the arc striking gap 1121 is provided on the arc extinguishing chamber 11, and the moving arc striking contact 32 is arranged to extend into the arc extinguishing chamber 11 from the arc striking gap 1121. Figure 4As shown, the arc striking member 4 comprises an arc striking static contact 41 and an arc striking piece 42. The arc striking static contact 41 is used to be connected or disconnected with the moving arc striking contact 32. The arc striking piece 42 extends from the arc striking static contact 41 to the farthest arc-extinguishing vane 113 from the first gap part 1121a in the arc-extinguishing chamber 11. That is, the bottom A of the arc striking piece 42 is close to the moving arc striking contact 32, facilitating the initial stage arc to be guided to itself after the first time arcing, and the upper end B of the arc striking piece 42 is arranged at the farthest end from the moving arc striking contact 32, ensuring that the arc is guided away from the moving arc striking contact 32, and after the arc is pulled apart, the arc is cut into short arcs by the plurality of arc-extinguishing vanes 113, the arc-extinguishing effect is enhanced by increasing the voltage drop in the near-pole region, and the service life of the moving arc striking contact 32 and the main moving contact 31 is ensured to the greatest extent.

[0076] As shown in some embodiments, Figure 4 As shown, the arc striking static contact 41 is horizontally arranged, and the load static contact 21 of the load connecting member 2 is obliquely arranged. This kind of structural design makes the moving arc striking contact 32 meet the condition of being connected first and then disconnected. Specifically, at the moment when the main moving contact 31 is just disconnected with the load static contact 21, the moving arc striking contact 32 is not disconnected with the arc striking static contact 41, and the power supply circuit is still in the connected state. When the main moving contact 31 continues to rise by a distance, the moving arc striking contact 32 is disconnected with the arc striking static contact 41. At this time, the position where the moving arc striking contact 32 is disconnected will generate an arc, and the arc-extinguishing effect acts on the moving arc striking contact 32 alone, greatly reducing the ablation of the arc on the adjacent main moving contact 31, thereby increasing the service life and ensuring the performance.

[0077] As shown in some embodiments, Figure 5 As shown, the first moving contact assembly 3a and the second moving contact assembly 3b each comprise at least two main moving contacts 31 and one moving arc striking contact 32. It can be understood that the at least two can be two, three or any number. The at least two main moving contacts 31 are arranged in sequence in the axial direction around the moving contact assembly.

[0078] In addition, the length L1 of the moving arc striking contact 32 is greater than the length L2 of the main moving contact 31, so as to extend into the arc-extinguishing chamber 11. The arc generated in this way is mainly borne by the moving arc striking contact 32, and the arc-extinguishing chamber 11 is responsible for extinguishing the arc, thereby protecting the main moving contact 31 from being ablated by the arc and causing the service life of the whole machine to be shortened.

[0079] As shown in some embodiments, Figure 4 As shown, when the moving arc striking contact 32 is in contact and closed with the arc striking static contact 41, the moving arc striking contact 32 is perpendicular to the arc-extinguishing vane 113.

[0080] By implementing the utility model, the following beneficial effects are achieved:

[0081] The arc extinguishing device 1 is simple in structure, easy to assemble, small in space layout, realizes the purpose of reducing cost by reducing material, and is suitable for batch production.

[0082] It can be understood that the above embodiments only express part of the embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, the above-mentioned embodiments or technical features can be freely combined without departing from the concept of the utility model, and a number of modifications and improvements can be made, which belong to the protection scope of the utility model, that is, the embodiments described in "in some embodiments" can be freely combined with any of the above and below embodiments. Therefore, any equivalent transformation and modification within the scope of the claims of the utility model should belong to the scope of the claims of the utility model.

Claims

1. An arc extinguishing device, characterized in that The arc-extinguishing device comprises two arc-extinguishing chambers (11) arranged symmetrically opposite to each other, wherein the arc-extinguishing chambers (11) comprise: an insulating partition structure (111) forming a chamber (112) with an arc entrance gap (1121), the arc entrance gap (1121) comprising a first gap part (1121a) and a second gap part (1121b); the opening directions of the first gap parts (1121a) of the two arc-extinguishing chambers (11) are opposite, and the opening directions of the second gap parts (1121b) of the two arc-extinguishing chambers (11) are the same; and a plurality of arc-extinguishing grid pieces (113) arranged in the chamber (112).

2. The device of claim 1, wherein, The plurality of arc-extinguishing grid pieces (113) are arranged in steps, and the extension surfaces of the arc-extinguishing grid pieces (113) correspond to the first gap parts (1121a).

3. The device of claim 2, wherein, The arc-extinguishing grid pieces (113) are provided with gaps (1131) facing the second gap parts (1121b). The gaps (1131) of the plurality of arc-extinguishing grid pieces (113) are arranged in steps in a direction away from the first gap parts (1121a) and gradually close to the second gap parts (1121b).

4. The device of claim 1, wherein, The partition structure (111) comprises: a first arc-extinguishing partition (1111), a second arc-extinguishing partition (1112), and a third arc-extinguishing partition (1113), the first arc-extinguishing partition (1111) and the second arc-extinguishing partition (1112) are arranged opposite to each other, the third arc-extinguishing partition (1113) is an "L" shaped structure and is connected between the first arc-extinguishing partition (1111) and the second arc-extinguishing partition (1112); the first arc-extinguishing partition (1111), the second arc-extinguishing partition (1112), and the third arc-extinguishing partition (1113) jointly define the chamber (112) with the arc entrance gap (1121).

5. A power transfer switch, characterized by The arc-extinguishing device of any one of claims 1-4.

6. The automatic transfer switch of claim 5, wherein, The power automatic transfer switch further comprises: a load connecting piece (2) for connecting load terminals, two sides of the load connecting piece (2) are respectively provided with load static contacts (21); a first movable contact assembly (3a) for connecting first power supply terminals, the first movable contact assembly (3a) is located at the opening direction of the first gap part (1121a) of one arc-extinguishing chamber (11) of the arc-extinguishing device and partially extends into the corresponding arc-extinguishing chamber (11); and a second movable contact assembly (3b) for connecting second power supply terminals, the second movable contact assembly (3b) is located at the opening direction of the first gap part (1121a) of the other arc-extinguishing chamber (11) of the arc-extinguishing device and partially extends into the corresponding arc-extinguishing chamber (11); wherein the power automatic transfer switch has a double-break state, a first closing state, and a second closing state. When the power automatic transfer switch is in the first closed state, the first movable contact assembly (3a) is connected with the load static contact (21) on the corresponding side of the load connection (2), and the second movable contact assembly (3b) is disconnected with the load static contact (21) on the corresponding side of the load connection (2); When the power automatic transfer switch is in the second closed state, the first movable contact assembly (3a) is disconnected with the load static contact (21) on the corresponding side of the load connection (2), and the second movable contact assembly (3b) is connected with the load static contact (21) on the corresponding side of the load connection (2); When the power automatic transfer switch is in the double split state, the first movable contact assembly (3a) and the second movable contact assembly (3b) are disconnected with the load static contact (21) of the load connection (2).

7. The automatic transfer switch of claim 6, wherein, The power automatic transfer switch further comprises: An arc striking element (4) is arranged in each of the arc extinguishing chambers (11), and the arc striking element (4) is fixed with the load connection (2); The first movable contact assembly (3a) and the second movable contact assembly (3b) respectively comprise: A main movable contact (31) is arranged outside the arc extinguishing chamber (11), and the main movable contact (31) is used to connect or disconnect with the load static contact (21) on the corresponding side of the load connection (2); and A movable arc striking contact (32) is arranged in the arc extinguishing chamber (11) and can move in the arc extinguishing chamber (11), and the movable arc striking contact (32) is used to connect or disconnect with the arc striking element (4) in the corresponding arc extinguishing chamber (11), and the arc striking element (4) is used to guide the arc generated when the movable arc striking contact (32) is disconnected to be away from the movable arc striking contact (32).

8. The automatic transfer switch of claim 7, wherein, The arc striking element (4) comprises: An arc striking static contact (41) is used to connect or disconnect with the movable arc striking contact (32); and An arc striking sheet (42) extends from the arc striking static contact (41) to the arc extinguishing grid (113) farthest from the first gap (1121a) in the arc extinguishing chamber (11).

9. The automatic transfer switch of claim 8, wherein, The arc striking static contact (41) is arranged horizontally, and the load static contact (21) of the load connection (2) is arranged obliquely.

10. The automatic transfer switch of claim 7, wherein, The length of the movable arc striking contact (32) is greater than the length of the main movable contact (31).

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