CN219350035U - Dual-power automatic transfer switch and contact system thereof - Google Patents

Abstract

The utility model discloses a contact system of a dual-power automatic transfer switch, which comprises a base and two contact units. Each contact unit comprises a fixed contact and a movable contact assembly. The stationary contact is arranged fixed in position relative to the base. The static contacts of the two contact units are respectively used for connecting a common power supply and a standby power supply. The movable contact assembly is arranged to be rotatable relative to the base. Each moving contact assembly includes two contacts. The movable contact assembly can enable the fixed contact to be inserted between the two contact pieces by rotating relative to the base and can be in conductive contact with the two contact pieces after being inserted. The contact is used for connecting an electric load. The contact system is beneficial to improving the short-time withstand current which can be born by the double-power automatic transfer switch. In addition, a dual-power automatic transfer switch is also provided.

Description

Dual-power automatic transfer switch and contact system thereof

Technical Field

The utility model relates to a contact system, in particular to a contact system of a dual-power automatic transfer switch and the dual-power automatic transfer switch comprising the same.

Background

Dual-power automatic transfer switches are a common type of switching equipment that is used mainly in emergency power supply systems. The dual-power automatic transfer switch can automatically transfer the load circuit from the common power supply to the standby power supply when the common power supply is suddenly powered off, so as to ensure continuous and reliable operation of important loads. Therefore, the dual-power automatic transfer switch is often applied to important electric fields, and the reliability of the product is particularly important.

At present, a contact system of the dual-power automatic transfer switch mainly adopts a clapping structure, namely, a moving contact and a fixed contact are directly contacted and conducted on the front surface during closing operation. The short-time withstand current (Icw) that can be tolerated by products with such a construction is relatively low due to the effect of the electrodynamic repulsion forces.

Disclosure of Invention

The utility model aims to provide a contact system of a dual-power automatic transfer switch, which is beneficial to improving the short-time withstand current which can be born by the dual-power automatic transfer switch.

It is another object of the present utility model to provide a dual-power automatic transfer switch whose contact system facilitates an increase in short-time withstand current that the dual-power automatic transfer switch can withstand.

The utility model provides a contact system of a dual-power automatic transfer switch, which comprises a base and two contact units. Each contact unit comprises a fixed contact and a movable contact assembly. The stationary contact is arranged fixed in position relative to the base. The static contacts of the two contact units are respectively used for connecting a common power supply and a standby power supply. The movable contact assembly is arranged to be rotatable relative to the base. Each moving contact assembly includes two contacts. The movable contact assembly can enable the fixed contact to be inserted between the two contact pieces by rotating relative to the base and can be in conductive contact with the two contact pieces after being inserted. The contact is used for connecting an electric load.

According to the contact system of the dual-power automatic transfer switch, after the movable contact assembly of the contact unit is switched on with the fixed contact, the fixed contact is inserted between the two contact pieces and is in contact conduction with the two contact pieces, so that the two contact pieces which are electrified can generate electromagnetic force which attracts each other, the bonding strength of the contact pieces and the fixed contact is improved, and the short-time withstand current which can be born by the dual-power automatic transfer switch is improved.

In another exemplary embodiment of the contact system of the dual power automatic transfer switch, the contact system further comprises a conductive strip. The conductive bars are arranged in a fixed position relative to the base and are used for connecting an electric load. The conductive bar has a flat plate-shaped connection portion. The rotation axes of the movable contact assemblies of the two contact units are perpendicular to the plate surface of the connecting part. Each contact is in the shape of a flat plate. The two contact pieces of each moving contact assembly are respectively and electrically contacted with the two side surfaces of the connecting part in a mode that the plate surface is attached to the plate surface. Each contact unit also comprises a connecting rotating shaft. The connecting rotating shaft penetrates through the connecting part of the conducting bar and the two contact pieces. The movable contact assembly is rotatably connected with the connecting part of the conducting bar through the connecting rotating shaft. The structure is simple and the stability is good.

In yet another exemplary embodiment of the contact system of the dual power automatic transfer switch, each contact is elongated. The two ends of each contact piece along the length direction are respectively a connecting end and a movable contact end. The connecting end can be electrically contacted with the connecting part and penetrated by the connecting rotating shaft. The movable contact ends of the two contact pieces of each movable contact assembly are opposite along the direction parallel to the rotation axis of the movable contact assembly. The movable contact assembly can enable the fixed contact to be inserted between the two movable contact ends by rotating relative to the base and to be in conductive contact with the two movable contact ends after being inserted. Each movable contact assembly also comprises two elastic sheets and a connecting rod. The two elastic sheets are respectively positioned on two opposite sides of the two contact pieces. The connecting rod passes through the two elastic sheets and the two contact pieces. The two ends of the connecting rod are respectively provided with an abutting part. Each spring piece abuts against one abutting part and applies elastic force to the movable contact end of one contact piece, so that the two movable contact ends are clamped against the fixed contact inserted therein. The bonding strength of the contact piece and the fixed contact is further increased through the elastic piece, so that the short-time withstand current which can be born by the dual-power automatic transfer switch is further improved.

In yet another exemplary embodiment of the contact system of the dual power automatic transfer switch, each movable contact assembly further includes two stoppers. The two limiting blocks are respectively arranged on the opposite surfaces of the movable contact ends of the two contact pieces. The two limiting blocks are opposite along the direction parallel to the rotation axis of the movable contact assembly, so that the two limiting blocks are abutted against each other under the action of the two elastic sheets, and a gap for inserting the fixed contact is kept between the two movable contact ends. By arranging the limiting block, the static contact is helped to be smoothly inserted between the two movable contact ends.

In yet another exemplary embodiment of the contact system of the dual power automatic transfer switch, each moving contact assembly further includes two electromagnetic attraction pads. The two electromagnetic attraction sheets are respectively positioned on two opposite sides of the two contact pieces and are attached to the contact pieces to conduct electricity. The electromagnetic attraction sheet can generate electromagnetic force. The two elastic sheets are respectively positioned at two opposite sides of the two electromagnetic suction sheets. The spring plate applies elastic force to the movable contact end of the contact piece by abutting against the electromagnetic suction piece. The connecting rod is arranged on the two electromagnetic suction sheets in a penetrating way. Therefore, the bonding strength of the contact piece and the fixed contact is further improved, and the short-time withstand current which can be born by the dual-power automatic transfer switch is further improved.

In a further exemplary embodiment of the contact system of the dual-power automatic transfer switch, the axes of rotation of the two moving contact assemblies are arranged mirror-image with respect to a first plane. Each stationary contact includes a stationary contact end. The stationary contact end is adapted to be interposed between and in electrically conductive contact with the two contact members. The static contact ends of the two static contacts are arranged in a mirror image mode relative to the first plane. Thereby facilitating improved electrical performance.

In yet another exemplary embodiment of the contact system of the dual power automatic transfer switch, each stationary contact further includes a stationary terminal. The static terminals of the two static contacts are positioned on the same side of the first plane. The conductor bar has a load terminal. The load terminal is located on the other side of the first plane. Thereby facilitating wiring.

In a further exemplary embodiment of the contact system of the dual-power automatic transfer switch, the conductor bars intersect the stationary contacts of one of the contact units in a direction parallel to the axis of rotation of the movable contact assembly. The contact system further includes an insulator. The insulator includes a first spacer and a plurality of second spacers. The first separator is positioned to separate the conductor bars from the stationary contacts at their intersections. The second baffle is connected with the first baffle. The second partition plates are parallel to each other. The part of the static contact which is intersected with the conducting bar passes through the space between two adjacent second partition boards. Thereby being beneficial to increasing the creepage distance so as to improve the electrical performance of the dual-power automatic transfer switch.

In yet another exemplary embodiment of the contact system of the dual-power automatic transfer switch, each contact unit further includes a rotating member, a connecting rod, and a driving shaft. The rotating piece is arranged to be rotatable relative to the base and the rotation axis is parallel to the rotation axis of the moving contact assembly. One end of the connecting rod is rotatably connected with the rotating piece, and the other end of the connecting rod is rotatably connected with the moving contact assembly, so that the rotating piece can drive the moving contact assembly to rotate through the connecting rod. The driving shaft penetrates through the rotating piece, and the axis of the driving shaft coincides with the rotating axis of the rotating piece. The driving shaft can drive the rotating piece to rotate through rotation. Thereby facilitating the rotation of the movable contact assembly.

The utility model also provides a dual-power automatic transfer switch, which comprises the contact system. According to the contact system of the dual-power automatic transfer switch, after the movable contact assembly of the contact unit is switched on with the fixed contact, the fixed contact is inserted between the two contact pieces and is in contact conduction with the two contact pieces, so that the two contact pieces which are electrified can generate electromagnetic force which attracts each other, the bonding strength of the contact pieces and the fixed contact is improved, and the short-time withstand current which can be born by the dual-power automatic transfer switch is improved.

Drawings

The following drawings are only illustrative of the utility model and do not limit the scope of the utility model.

Fig. 1 is a schematic structural view of one exemplary embodiment of a contact system of a dual power automatic transfer switch.

Fig. 2 is a view for explaining a moving contact assembly of the contact system shown in fig. 1.

Fig. 3 is a view for explaining a state after the movable contact assembly shown in fig. 2 is inserted into the stationary contact.

Fig. 4 shows the connection relationship of two moving contact assemblies, two connecting shafts and connecting portions of the conductive bars.

Fig. 5 is a perspective view of a portion of the structure of the contact system shown in fig. 1.

Fig. 6 is a cross-sectional view of the stationary contact, the conductor bars and the insulator taken along line vi-vi in fig. 1.

Description of the reference numerals

10. Base seat

20. Contact unit

30. Static contact

31. Static contact end

32. Static terminal

40. Moving contact assembly

41. Contact element

411. Connecting terminal

412. Movable contact terminal

42. Spring plate

43. Connecting rod

431 abutment

44. Limiting block

45. Electromagnetic suction sheet

51. Rotating member

52. Connecting rod

53. Driving shaft

54. Connection rotating shaft

60. Conducting bar

61. Connecting part

62. Load terminal

70. Insulating member

71. First partition board

72. Second partition board

Rotation axis of L-shaped movable contact assembly

S1 first plane

Detailed Description

For a clearer understanding of the technical features, objects and effects of the present utility model, embodiments of the present utility model will now be described with reference to the drawings, in which like reference numerals refer to identical or structurally similar but functionally identical components throughout the separate views.

In this document, "schematic" means "serving as an example, instance, or illustration," and any illustrations, embodiments described herein as "schematic" should not be construed as a more preferred or advantageous solution.

For the sake of simplicity of the drawing, the parts relevant to the present utility model are shown only schematically in the figures, which do not represent the actual structure thereof as a product. In addition, for simplicity and ease of understanding, components having the same structure or function in some of the figures are shown schematically only one of them, or only one of them is labeled.

Nouns and pronouns for humans in this patent application are not limited to a particular gender.

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate positional relationships between related parts, and do not define their absolute positions.

Herein, "first", "second", etc. are used merely to distinguish one from another, and do not indicate their importance, order, etc.

Herein, "parallel", "perpendicular", etc. are not strictly mathematical and/or geometric limitations, but also include tolerances which may be understood and appreciated by those skilled in the art and which may be varied in making or using the same.

For the sake of simplicity of the drawing, the parts relevant to the present utility model are shown only schematically in the figures, which do not represent the actual structure thereof as a product.

Fig. 1 is a schematic structural view of one exemplary embodiment of a contact system of a dual power automatic transfer switch. As shown in fig. 1, the contact system of the dual power automatic transfer switch includes a base 10 and two contact units 20.

Each contact unit 20 includes a stationary contact 30 and a movable contact assembly 40. The stationary contact 30 is provided fixed in position relative to the base 10. The stationary contacts 30 of the two contact units 20 are used for connecting a common power source and a backup power source, respectively.

The movable contact assembly 40 is provided rotatably with respect to the base 10. In the present exemplary embodiment, the rotation axes L of the moving contact assemblies 40 of the two contact units 20 are parallel to each other (in fig. 1, the rotation axes L of the two moving contact assemblies 40 are both perpendicular to the drawing plane), but is not limited thereto. In other exemplary embodiments, the axes of rotation L of the moving contact assemblies 40 of the two contact units 20 may also be non-parallel.

Fig. 2 is a view for explaining a moving contact assembly of the contact system shown in fig. 1. As shown in fig. 2, each movable contact assembly 40 includes two contact pieces 41. The movable contact assembly 40 is capable of inserting the stationary contact 30 between the two contacts 41 by rotating with respect to the base 10 and conductively contacting (i.e., closing) the two contacts 41 after the insertion. As shown in fig. 1, each stationary contact 30 includes a stationary contact end 31. The stationary contact end 31 is intended to be inserted between two contact pieces 41 and to be in electrically conductive contact with the two contact pieces 41. In fig. 1, the moving contact assembly 40 on the left side has been rotated until the stationary contact end 31 is inserted between the two contact pieces 41, and the moving contact assembly 40 on the right side is in a separated state from the stationary contact end 31. Fig. 3 shows the state after the movable contact assembly 40 is inserted into the stationary contact end 31. The contact 41 is used for connecting an electrical load.

According to the contact system of the dual-power automatic transfer switch, after the movable contact assembly 40 of the contact unit 20 and the fixed contact 30 are switched on, the fixed contact 30 is inserted between the two contact pieces 41 and is in contact conduction with the two contact pieces 41, so that the two contact pieces 41 can generate electromagnetic force which attracts each other, the bonding strength of the contact pieces 41 and the fixed contact 30 is improved, and short-time withstand current which can be born by the dual-power automatic transfer switch is improved.

As shown in fig. 1, in the present exemplary embodiment, the contact system further includes an electrical conductor bar 60. The conductive bars 60 are arranged to be fixed in position relative to the base 10 and are used to connect an electrical load. The conductor bar 60 has a flat plate-shaped connection portion 61. Fig. 4 shows the connection relationship between the movable contact assembly 40 and the connection portion 61. As shown in fig. 1 and 4, the rotation axes L of the moving contact assemblies 40 of the two contact units 20 are both perpendicular to the plate surface of the connection portion 61. As shown in fig. 2 and 4, each contact 41 has a flat plate shape, and the two contacts 41 of each movable contact assembly 40 are respectively electrically contacted with the two side surfaces of the connecting portion 61 so that the plate surface is contacted with the plate surface. As shown in fig. 2, each contact unit 20 further includes a connection shaft 54. The connection shaft 54 is disposed through the connection portion 61 of the conductive bar 60 and the two contacts 41. The movable contact assembly 40 is rotatably connected to the connection portion 61 of the conductive bar 60 through the connection shaft 54. The structure is simple and the stability is good.

As shown in fig. 2 and 3, in the exemplary embodiment, each contact 41 is elongated. The contact 41 has a connecting end 411 and a movable contact end 412 at both ends in the longitudinal direction thereof. The connection end 411 is electrically contacted to the connection portion 61 and is penetrated by the connection shaft 54. The movable contact ends 412 of the two contacts 41 of each movable contact assembly 40 are opposed in a direction parallel to the rotation axis L of the movable contact assembly 40. The movable contact assembly 40 is capable of inserting the stationary contact end 31 of the stationary contact 30 between the two movable contact ends 412 by rotating with respect to the base 10 and conductively contacting the two movable contact ends 412 after the insertion (see fig. 3).

As shown in fig. 2, each moving contact assembly 40 further includes two spring plates 42, two electromagnetic attraction plates 45, and one connecting rod 43. The two electromagnetic attraction pieces 45 are respectively located on two opposite sides of the two contact pieces 41 and are attached to the contact pieces 41 to conduct electricity. The electromagnetic attraction sheet 45 thus electrically energized is capable of generating electromagnetic force. The electromagnetic attraction sheet 45 is made of pure electrical iron, for example, so as to have better magnetic permeability. The contact 41 is made of copper, for example, so as to have good conductivity. The connecting rotating shaft 54 penetrates through the two electromagnetic suction sheets 45. The two spring plates 42 are respectively positioned on two opposite sides of the two electromagnetic suction plates 45. The connecting rod 43 penetrates through the two elastic sheets 42, the two electromagnetic suction sheets 45 and the two contact pieces 41. The connecting rod 43 has an abutment 431 at each end. Each spring piece 42 abuts against one abutting portion 431 and applies elastic force to the movable contact end 412 of one contact piece 41 through abutting against the electromagnetic suction piece 45, so that the two movable contact ends 412 are clamped against the fixed contact end 31 (see fig. 3) of the fixed contact 30 inserted therein, and therefore the bonding strength of the contact piece 41 and the fixed contact 30 is further increased through the spring piece 42, and the short-time withstand current which can be borne by the double-power automatic transfer switch is further improved.

Specifically, as shown in fig. 2, in the case where the stationary contact end 31 is not inserted between the two movable contact ends 412, the two movable contact ends 412 are kept at a small interval by the elastic piece 42. In the process of inserting the static contact end 31 between the two movable contact ends 412, the two movable contact ends 412 are far away from each other against the elastic force of the elastic sheet 42 under the abutting of the static contact end 31, and in the process, the contact piece 41 and the electromagnetic suction sheet 45 can be elastically deformed. As shown in fig. 3, after the stationary contact end 31 is inserted between the two movable contact ends 412, the two movable contact ends 412 are clamped against the stationary contact end 31 by the elastic sheet 42, and the clamping force is different from the electromagnetic force even when the switch is closed but not energized. In order to be able to insert between the two movable contact ends 412 and to bring the two movable contact ends 412 away from each other against the two movable contact ends 412 during insertion, the tip end (i.e. the upper end in fig. 1) of the stationary contact end 31 is, for example, provided with a gradually decreasing thickness from bottom to top in a direction parallel to the rotational axis L of the movable contact assembly 40.

After the movable contact assembly 40 of the contact unit 20 and the fixed contact 30 are closed, the two electromagnetic attraction sheets 45 are attracted to each other through electromagnetic force, so that the bonding strength of the contact 41 and the fixed contact 30 is further increased, and the short-time withstand current which can be born by the dual-power automatic transfer switch is further improved. In other exemplary embodiments, the electromagnetic attraction sheet 45 may not be provided.

As shown in fig. 2, in the exemplary embodiment, each movable contact assembly 40 further includes two stop blocks 44. The two stoppers 44 are respectively disposed on opposite surfaces of the movable contact ends 412 of the two contacts 41. The two stoppers 44 are opposite in a direction parallel to the rotation axis L of the movable contact assembly 40, so that the two stoppers 44 abut against each other under the action of the two elastic pieces 42, thereby maintaining a constant gap between the two movable contact ends 412 for the insertion of the stationary contact end 31 of the stationary contact 30. As shown in fig. 3, after the stationary contact end 31 is inserted between the two movable contact ends 412, the two stoppers 44 are separated. By providing the stopper 44, the stationary contact end 31 of the stationary contact 30 is facilitated to be smoothly inserted between the two movable contact ends 412.

As shown in fig. 1, in the exemplary embodiment, the axes of rotation L of the two moving contact assemblies 40 are arranged mirror-image with respect to a first plane S1. The stationary contact ends 31 of the two stationary contacts 30 are arranged mirror-image with respect to the first plane S1. The rotation axis L of the movable contact assembly 40 is closer to the first plane S1 than the stationary contact end 31. Thereby facilitating improved electrical performance.

As shown in fig. 1, in the exemplary embodiment, each stationary contact 30 further includes a stationary terminal 32. The static terminal 32 is used to connect to a power source. The stationary terminals 32 of the two stationary contacts 30 are located on the same side (left side in fig. 1) of the first plane S1. The conductor bar 60 has a load terminal 62. The load terminals 62 are used to connect electrical loads. The load terminal 62 is located on the other side (right side in fig. 1) of the first plane S1. Thereby facilitating wiring.

As shown in fig. 1, in the exemplary embodiment, the conductive bars 60 intersect the stationary contact 30 of one of the contact units 20 in a direction parallel to the rotational axis L of the movable contact assembly 40. Fig. 5 is a perspective view of a portion of the structure of the contact system shown in fig. 1, and referring to fig. 1 and 5, the contact system further includes an insulator 70. Fig. 6 is a cross-sectional view of the stationary contact, the conductor bar and the insulator taken along line vi-vi in fig. 1. As shown in fig. 6, the insulating member 70 includes one first separator 71 and three second separators 72. The first spacer 71 is positioned to separate the conductive bar 60 and the stationary contact 30 at the crossing portion of the conductive bar 60 and the stationary contact 30. The second partition 72 is connected to the first partition 71. The three second partitions 72 are parallel to each other. The portion of the stationary contact 30 intersecting the conductive strip 60 passes between two adjacent second partitions 72. Thereby being beneficial to increasing the creepage distance so as to improve the electrical performance of the dual-power automatic transfer switch. In other exemplary embodiments, the number of second baffles 72 may be adjusted as desired, for example, only two second baffles 72 in fig. 6 immediately adjacent the stationary contact 30 are retained.

As shown in fig. 1 and 5, in the exemplary embodiment, each contact unit 20 further includes a rotating member 51, a connecting rod 52, and a driving shaft 53. The rotating member 51 is provided rotatably with respect to the base 10 and the rotation axis is parallel to the rotation axis L of the movable contact assembly 40. The connecting rod 52 has one end rotatably connected to the rotating member 51 and the other end rotatably connected to the moving contact assembly 40, and the rotation axes are parallel to the rotation axis L of the moving contact assembly 40. The rotating member 51 can drive the moving contact assembly 40 to rotate through the connecting rod 52. The driving shaft 53 is disposed through the rotating member 51, and an axis of the driving shaft 53 coincides with a rotation axis of the rotating member 51. The drive shaft 53 can rotate the rotator 51 by rotation. The driving shaft 53 is, for example, a square shaft. Thereby facilitating rotation of the movable contact assembly 40.

The utility model also provides a dual-power automatic transfer switch, which comprises the contact system shown in fig. 1. According to the contact system of the dual-power automatic transfer switch, after the movable contact assembly 40 of the contact unit 20 and the fixed contact 30 are switched on, the fixed contact 30 is inserted between the two contact pieces 41 and is in contact conduction with the two contact pieces 41, so that the two contact pieces 41 can generate electromagnetic force which attracts each other, the bonding strength of the contact pieces 41 and the fixed contact 30 is improved, and short-time withstand current which can be born by the dual-power automatic transfer switch is improved.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical examples of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications, such as combinations, divisions or repetitions of features, without departing from the technical spirit of the present utility model are included in the scope of the present utility model.

Claims (10)

1. The utility model provides a contact system of dual power automatic transfer switch which characterized in that includes:

a base (10); and

two contact units (20), each of the contact units (20) comprising:

a stationary contact (30) arranged to be fixed in position relative to said base (10), said stationary contacts (30) of both said contact units (20) being for connecting a common power source and a backup power source, respectively, and

-a moving contact assembly (40) arranged rotatable with respect to the base (10), the moving contact assembly (40) comprising two contact members (41), the moving contact assembly (40) being capable of inserting the stationary contact (30) between the two contact members (41) by rotation with respect to the base (10) and being in electrically conductive contact with the two contact members (41) after insertion, the contact members (41) being adapted to connect an electrical load.

2. The contact system of a double-power automatic transfer switch according to claim 1, characterized in that the contact system further comprises a conductive bar (60), the conductive bar (60) being arranged to be fixed in position relative to the base (10) and for connecting an electrical load, the conductive bar (60) having a flat connection (61), the axes of rotation (L) of the moving contact assemblies (40) of the two contact units (20) being perpendicular to the plate surface of the connection (61), each contact (41) being flat, the two contact members (41) of each moving contact assembly (40) being electrically conductively attached to both sides of the connection (61) in a plate surface-to-plate manner, each contact unit (20) further comprising a connection shaft (54), the connection shaft (54) being arranged through the connection (61) of the conductive bar (60) and the two contact members (41), the moving contact assemblies (40) being electrically connectable to the conductive bar (61) by the connection shaft (54).

3. The contact system of a dual-power automatic transfer switch according to claim 2, wherein each contact member (41) is elongated, each contact member (41) has a connecting end (411) and a movable contact end (412) at both ends in a longitudinal direction thereof, the connecting ends (411) are electrically contacted with the connecting portions (61) and penetrated by the connecting shaft (54), the movable contact ends (412) of the two contact members (41) of each movable contact assembly (40) are opposed in a direction parallel to a rotation axis (L) of the movable contact assembly (40), the movable contact assembly (40) is capable of inserting the stationary contact (30) between the two movable contact ends (412) by rotating with respect to the base (10) and is electrically contacted with the two movable contact ends (412) after the insertion, each movable contact assembly (40) further includes two elastic pieces (42) and a connecting rod (43), the two elastic pieces (42) are respectively positioned on both sides of the two elastic pieces (43) of the two opposite contact members (41) and the two elastic pieces (43) are provided, each elastic sheet (42) abuts against one abutting portion (431) and applies elastic force to the movable contact end (412) of one contact (41) so that the two movable contact ends (412) are clamped against the fixed contact (30) inserted therein.

4. A contact system of a double-power automatic transfer switch according to claim 3, characterized in that each of the movable contact assemblies (40) further comprises two stoppers (44), the two stoppers (44) being respectively provided on opposite surfaces of the movable contact ends (412) of the two contacts (41), the two stoppers (44) being opposite in a direction parallel to the rotation axis (L) of the movable contact assembly (40) so that the two stoppers (44) abut against each other under the action of the two elastic pieces (42) to maintain a gap between the two movable contact ends (412) for the insertion of the stationary contact (30).

5. A contact system of a dual-power automatic transfer switch according to claim 3, wherein each movable contact assembly (40) further comprises two electromagnetic suction plates (45), the two electromagnetic suction plates (45) are respectively located at two opposite sides of the two contact pieces (41) and are attached to the contact pieces (41) to conduct electricity, the electromagnetic suction plates (45) which obtain electricity can generate electromagnetic force, the two elastic plates (42) are respectively located at two opposite sides of the two electromagnetic suction plates (45), the elastic plates (42) apply elastic force to the movable contact ends (412) of the contact pieces (41) by abutting against the electromagnetic suction plates (45), and the connecting rod (43) penetrates through the two electromagnetic suction plates (45).

6. The contact system of a double-power automatic transfer switch according to claim 2, characterized in that the axes of rotation (L) of the two moving contact assemblies (40) are arranged mirrored with respect to a first plane (S1), each of the stationary contacts (30) comprising a stationary contact end (31), the stationary contact ends (31) being intended to be interposed between two of the contact elements (41) and to be in electrically conductive contact with two of the contact elements (41), the stationary contact ends (31) of two of the stationary contacts (30) being arranged mirrored with respect to the first plane (S1).

7. The contact system of a dual power automatic transfer switch of claim 6, wherein each of said stationary contacts (30) further comprises a stationary terminal (32), said stationary terminals (32) of two of said stationary contacts (30) being located on the same side of said first plane (S1), said conductor bar (60) having a load terminal (62), said load terminal (62) being located on the other side of said first plane (S1).

8. The contact system of a double power automatic transfer switch according to claim 7, characterized in that the conductive strip (60) crosses the stationary contact (30) of one of the contact units (20) in a direction parallel to the rotation axis (L) of the movable contact assembly (40), the contact system further comprising an insulating member (70), the insulating member (70) comprising a first partition (71) and a plurality of second partitions (72), the first partition (71) being positioned to separate the conductive strip (60) and the stationary contact (30) at a crossing portion of the conductive strip (60) and the stationary contact (30), the second partition (72) connecting the first partition (71), the plurality of second partitions (72) being parallel to each other, a portion of the stationary contact (30) crossing the conductive strip (60) crossing from two adjacent second partitions (72).

9. The contact system of a dual power automatic transfer switch of claim 1, wherein each of said contact units (20) further comprises:

a rotating member (51) which is provided rotatably with respect to the base (10) and whose axis of rotation is parallel to the axis of rotation (L) of the movable contact assembly (40);

a connecting rod (52) with one end rotatably connected with the rotating member (51) and the other end rotatably connected with the moving contact assembly (40), so that the rotating member (51) can drive the moving contact assembly (40) to rotate through the connecting rod (52); and

and the driving shaft (53) penetrates through the rotating piece (51), the axis of the driving shaft (53) is coincident with the rotating axis of the rotating piece (51), and the driving shaft (53) can drive the rotating piece (51) to rotate through rotation.

10. Dual power automatic transfer switch, characterized by comprising a contact system according to any of claims 1 to 9.

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