Contact assembly of breaking device and dual-power change-over switch
By designing a combination structure of arc-extinguishing components and static and moving contacts in a dual-power transfer switch, and by optimizing the magnetic field and arc path, the problem of insufficient arc extinguishing and connection/disconnection performance was solved, thus achieving efficient power switching and current withstand capability of the equipment.
Patent Information
- Application Number
- CN202520405507.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-07
AI Technical Summary
Existing dual-power transfer switches have shortcomings in arc extinguishing and connection/disconnection performance, which prevents the equipment from effectively switching power in the event of a power failure, potentially leading to equipment damage or power outage.
The contact assembly design includes an arc-extinguishing component, a stationary contact, and a moving contact. The arc is extinguished by the magnetic field formed by the arc-extinguishing grid and the arc-inducing plate, and the closed state is maintained by the contact pressure component. The rotation trajectory design of the moving and stationary contacts optimizes the arc extinguishing path.
The switching performance and short-time withstand current performance of the dual power supply transfer switch have been improved, ensuring power continuity and equipment safety, and preventing equipment damage caused by overcurrent.
Smart Images
Figure CN223858046U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] Embodiments of the present disclosure generally relate to the field of electrical equipment, and in particular, to a contact assembly of a disconnector and a double power transfer switch. BACKGROUND
[0002] In some electrical equipment, to avoid power failure caused by the electrical equipment, two independent power supplies, i.e., a normal power supply and a backup power supply, are usually configured for the electrical equipment. The normal power supply and the backup power supply selectively supply power to the electrical equipment through a double power transfer switch (also referred to as a double power automatic transfer switch), thereby providing continuous power supply for important electrical equipment.
[0003] The double power transfer switch includes two contact assemblies, each of which includes a static contact, a moving contact mounted on a moving contact support, and an arc extinguishing assembly. The moving contact support can rotate between an open position and a closed position. When the moving contact support is in the open position, the moving contact on the moving contact support is separated from the static contact, and at this time the contact assembly is in an open state. When the moving contact support is in the closed position, the moving contact on the moving contact support abuts against the static contact, and at this time the contact assembly is in a closed state. One of the two contact assemblies is in the closed state, and the other is in the open state, so that one of the normal power supply and the backup power supply supplies power to the equipment. The arc extinguishing assembly is used to extinguish the arc generated when the moving contact and the static contact are separated. SUMMARY
[0004] In a first aspect of the present disclosure, a contact assembly of a disconnector for a double power transfer switch is provided, comprising: an arc extinguishing assembly including an arc extinguishing grid set in an arc extinguishing chamber and a first arc striking sheet and a second arc striking sheet at two ends of the arc extinguishing chamber; a static contact connected with a line terminal through a first braid and sleeved on a first pivot, the static contact being capable of rotating between a first closed position and a first open position, wherein the static contact comprises: a first section opposite to the first arc striking sheet, a first end of the first section being pivotally connected with the first pivot; a second section, a first end of the second section being connected with a second end of the first section, and a second end of the second section extending towards the first arc striking sheet; and a third section, a first end of the third section being connected with a second end of the second section, and a second end of the third section extending away from the first arc striking sheet, the third section being provided with a static contact point, and when the static contact is in the first open position, the first end of the third section is close to the first arc striking sheet; and a contact pressure piece elastically abutting against the static contact to apply a force to the static contact to move towards the first open position.
[0005] In some embodiments, the contact assembly further comprises a shielding piece arranged between the first section and the first arc striking sheet.
[0006] In some embodiments, the contact assembly further comprises: a moving contact provided with a moving contact point; and a moving contact holder fixedly connected with the moving contact and connected with the load terminal through the second braid, and wherein the moving contact holder is sleeved on the second pivot, so that the moving contact can rotate between the second closed position and the second open position, and when the moving contact is in the second closed position, the moving contact point abuts against the stationary contact point to keep the stationary contact in the first closed position.
[0007] In some embodiments, the contact assembly further comprises a gas production sheet located on both sides of the rotation track of the moving contact.
[0008] In some embodiments, the third section comprises a main body part, the stationary contact point is located at the second end of the main body part and protrudes relative to the main body part, and an arc striking protrusion is further provided on the main body part, the arc striking protrusion extends from the side wall of the stationary contact point to the first end of the main body part.
[0009] In some embodiments, the contact pressure piece comprises an elastic piece, the elastic piece abuts against the third section.
[0010] In some embodiments, the contact pressure piece further comprises: a fixed plate provided on the housing of the breaking device; and a support connected with the fixed plate, the elastic piece is sleeved on the support.
[0011] In some embodiments, the stationary contact further comprises a fourth section, the fourth section extends from the first end of the first section in a direction away from the first section, and the first braid is connected with the fourth section.
[0012] In some embodiments, the first braid is connected with the first section.
[0013] In a second aspect of the present disclosure, a double power transfer switch is provided, the double power transfer switch comprises a breaking device, the breaking device comprises two contact assemblies of the breaking device according to the first aspect of the present disclosure.
[0014] In embodiments according to the present disclosure, when the stationary contact and the moving contact are separated, the stationary contact can rotate around the first pivot to the first open position. At the first open position, the first section, the second section of the stationary contact and the first arc striking sheet of the arc extinguishing assembly form a U-shaped structure, and the current enters the first arc striking sheet through the second section of the stationary contact and generates a magnetic field around the first arc striking sheet. This magnetic field generates a magnetic blowing force on the arc between the stationary contact and the moving contact to move into the arc extinguishing chamber, thereby helping to quickly extinguish the arc and helping to improve the on-off breaking performance of the contact assembly.
[0015] It should be understood that the content described in this content part is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS
[0016] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
[0017] Figure 1 An internal structure schematic diagram of a disconnection device of a double power transfer switch according to an embodiment of the present disclosure is shown, the disconnection device comprising two contact assemblies according to an embodiment of the present disclosure;
[0018] Figure 2 An internal structure schematic diagram of a disconnection device of a double power transfer switch according to an embodiment of the present disclosure is shown, the disconnection device comprising two contact assemblies according to an embodiment of the present disclosure; Figure 1 A perspective structure schematic diagram of the disconnection device shown is shown;
[0019] Figures 3 to 6 An internal structure schematic diagram of a disconnection device of a double power transfer switch according to an embodiment of the present disclosure is shown, the disconnection device comprising two contact assemblies according to an embodiment of the present disclosure; Figure 1 The opening process of one of the two contact assemblies in the double power transfer switch shown is shown; and
[0020] Figure 7 An internal structure schematic diagram of a disconnection device of a double power transfer switch according to an embodiment of the present disclosure is shown, the disconnection device comprising two contact assemblies according to an embodiment of the present disclosure; Figure 3 A structure schematic diagram of a variant embodiment of the contact assembly shown is shown. DETAILED DESCRIPTION
[0021] Preferred embodiments of the present disclosure will be described herein below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure is more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.
[0022] The term "comprising" and variations thereof as used herein are intended to cover a non-exclusive inclusion, i.e., "including, but not limited to". Unless specifically stated, the term "or" means "and / or". The term "based on" means "based, at least in part, on". The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. can refer to different or same objects.
[0023] Embodiments of the present disclosure provide a contact assembly of a disconnection device and a double power transfer switch. The double power transfer switch configured with the contact assembly has good on-disconnection performance, and also has good short-time withstand current performance. In the following, the contact assembly of the disconnection device will be described in combination with Figures 1 to 7 The principles of the present disclosure are described.
[0024] Figure 1 An internal structure schematic diagram of a disconnection device of a double power transfer switch according to an embodiment of the present disclosure is shown, the disconnection device comprising two contact assemblies 100 according to an embodiment of the present disclosure. Figure 2A schematic view of the contact assembly 100 is shown in FIG. 1. Figure 1 A schematic view of the contact assembly 100 is shown in FIG. 1. Figures 3 to 6 A schematic view of the contact assembly 100 is shown in FIG. 1. Figure 1 A schematic view of the contact assembly 100 is shown in FIG. 1. Figure 7 A schematic view of the contact assembly 100 is shown in FIG. 1. Figure 3 A schematic view of the contact assembly 100 is shown in FIG. 1.
[0025] The breaking device for the double power transfer switch according to the embodiments of the present disclosure comprises a housing 80 and two contact assemblies 100 arranged on the housing 80, and the two contact assemblies 100 are substantially identical in structure. The structure of the contact assembly 100 will be described below mainly by taking one contact assembly 100 as an example.
[0026] Referring to FIGS. 1 and 2, Figure 1 and Figure 2 The contact assembly 100 comprises an arc extinguishing assembly 10, a stationary contact 20, a contact pressure piece 40, a shielding piece 50, a movable contact 61 and a movable contact bracket 62.
[0027] An arc chamber 801 is formed in the inner cavity of the housing 80 of the breaking device, and the arc extinguishing assembly 10 is arranged in the arc chamber 801. The arc extinguishing assembly 10 comprises an arc extinguishing grid set 13 in the arc chamber 801 and a first arc striking piece 11 and a second arc striking piece 12 at both ends of the arc chamber 801.
[0028] The line terminal 91 of the breaking device extends from the outside of the housing 80 into the inner cavity of the housing 80, and the line terminal 91 is used to be connected with the corresponding normal power supply or standby power supply.
[0029] The stationary contact 20 is arranged in the inner cavity of the housing 80 and located between the first arc striking piece 11 and the line terminal 91. The stationary contact 20 is connected with the line terminal 91 through the first braid wire 31 and is sleeved on the first pivot 201. The stationary contact 20 can rotate around the first pivot 201 between a first closed position and a first open position. The included angle between the first closed position and the first open position is small. Any suitable angle limiting mechanism can be arranged in the housing 80 to limit the rotation range of the stationary contact 20.
[0030] In some embodiments, the fixed contact 20 is generally in the shape of a bent piece, including a first segment 21, a second segment 22, a third segment 23 and a fourth segment 24. The first segment 21 is opposite to the first arc striking piece 11, and a first end of the first segment 21 is pivotally connected to the first pivot 201. A first end of the second segment 22 is connected to a second end of the first segment 21, and a second end of the second segment 22 extends towards the first arc striking piece 11. A first end of the third segment 23 is connected to the second end of the second segment 22, and a second end of the third segment 23 extends away from the first arc striking piece 11. A fixed contact point 231 is arranged on the second end of the third segment 23. The fourth segment 24 extends from the first end of the first segment 21 away from the first segment 21. The first braid wire 31 is connected to the fourth segment 24.
[0031] The contact pressure piece 40 is located in the inner cavity of the housing 80, and elastically abuts against the fixed contact 20 to apply an elastic force to the fixed contact 20 to move towards the first open position. In some embodiments, the contact pressure piece 40 includes, for example, an elastic piece 41, a fixed plate 42 and a support piece 43. The fixed plate 42 can be arranged on the housing 80 of the breaking device. The support piece 43, which can be a screw for example, is connected to the fixed plate 42, for example, by screwing. The elastic piece 41, which can be a spring for example, is sleeved on the support piece 43. The elastic piece 41 abuts against the third segment 23 of the fixed contact 20. Of course, the implementation of the contact pressure piece 40 is not limited thereto, as long as it can apply an elastic force to the fixed contact 20 to move towards the first open position.
[0032] The movable contact 61 and the movable contact holder 62 are located in the inner cavity of the housing 80. The movable contact 61 is fixedly connected to the movable contact holder 62, and the movable contact holder 62 is connected to the load terminal 92 through the second braid wire 32, and the load terminal is connected to the electrical equipment.
[0033] It should be noted that, in some embodiments, the movable contact holders 62 of the two contact assemblies 100 are connected to the same load terminal 92 through the corresponding second braid wires 32. In some alternative embodiments, the movable contact holders 62 of the two contact assemblies 100 are connected to two load terminals 92 through the corresponding second braid wires 32, and the two load terminals 92 can be stacked together and electrically connected to each other.
[0034] The movable contact holder 62 is sleeved on the second pivot 601, so that the movable contact 61 can rotate between the second closed position and the second open position. The movable contact 61 can be held in the second closed position and the second open position by an operating mechanism (not shown in the figure) connected to the movable contact holder 62.
[0035] In some embodiments, the first braid wire 31 is connected to the fourth segment 24 of the fixed contact 20, and the second braid wire 32 is connected to the movable contact holder 62 of the movable contact 61. In some alternative embodiments, the first braid wire 31 is connected to the fourth segment 24 of the fixed contact 20, and the second braid wire 32 is connected to the load terminal 92. Figure 1Of the two contact assemblies 100 shown, the upper contact assembly 100 is in the open state, and the lower contact assembly 100 is in the closed state. In the upper contact assembly 100, the moving contact 61 is in the second open position, and the stationary contact 20 is held in the first open position under the pressure of the contact pressure member 40. The moving contact 61 and the stationary contact 20 are far apart from each other, and there is an open circuit between the incoming terminal 91 and the load terminal 92. In the lower contact assembly 100, the moving contact 61 is in the second closed position, and the stationary contact 20 is pressed to the first closed position by the passive contact 61. The elastic member 41 is compressed, and the moving contact 611 of the moving contact 61 and the stationary contact 231 of the stationary contact 20 abut against each other. There is a closed circuit between the incoming terminal 91 and the load terminal 92.
[0036] The following is combined Figures 3 to 6 The tripping process of contact assembly 100 will be illustrated using one contact assembly 100 as an example. For simplicity of view, Figures 4 to 6 The second braided wire 32 and the load terminal 92 are not shown in the diagram.
[0037] See Figure 3 When the contact assembly 100 is in the closed state, the moving contact 61 is held in the second closed position by an operating mechanism connected to the moving contact bracket 62. The stationary contact 20 is held in the first closed position by the contact between the moving contact 611 and the stationary contact 231. The first end of the third segment 23 of the stationary contact 20 is offset from the first arc-starting piece 11. The elastic element 41 of the contact pressure element 40 is compressed. The current flowing from the mains power supply or backup power supply sequentially passes through the incoming terminal 91, the first braided wire 31, the stationary contact 20, the moving contact 61, the second braided wire 32, and the load terminal 92, flowing into the electrical equipment connected to the load terminal 92.
[0038] Both the stationary contact 20 and the moving contact 61 will be affected Figure 3 The electric force is indicated by the arrow N. When an overcurrent occurs in the circuit, although the electric force increases, the moving contact 61, fixed on the moving contact bracket 62, remains in the second closed position under the action of the operating mechanism, instead of immediately rotating in direction S2 around the second pivot 601. Simultaneously, the stationary contact 20, under the action of the contact pressure member 40 and the electric force, tends to rotate in direction S1 around the first pivot 201. Therefore, the stationary contact 231 of the stationary contact 20 and the moving contact 611 of the moving contact 61 are tightly fitted, keeping the contact assembly 100 in the closed state. Thus, the contact assembly 100 has high short-time withstand current performance. In this way, even if an overcurrent occurs due to a circuit fault, the dual-power transfer switch can still effectively carry the current. After the faulty circuit is disconnected by the corresponding circuit breaker, the dual-power transfer switch can effectively switch the power supply. Because the contact assembly 100 has high short-time withstand current performance, it can prevent the contact assembly 100 from being damaged by overcurrent, and can effectively improve the availability time of the continuous power supply.
[0039] Referring to Figure 4 When switching the power supply, the operating mechanism controls the movable contact 61 to rotate around the second pivot 601 in the direction S2 through the movable contact bracket 62. The stationary contact 20 is pushed by the contact pressure piece 40 to rotate around the first pivot 201 in the direction S1 to the first open position. Figure 4 The stationary contact 20 in the first open position. When the stationary contact 20 moves to the first open position, the stationary contact 20 no longer continues to rotate in the direction S1, and the movable contact 611 of the movable contact 61 begins to separate from the stationary contact 231 of the stationary contact 20.
[0040] When the stationary contact 20 is in the first open position, the first end of the third section 23 of the stationary contact 20 is close to the first arc guiding piece 11, and the gap between the first end of the third section 23 of the stationary contact 20 and the first arc guiding piece 11 is relatively small. The first section 21, the second section 22 of the stationary contact 20 and the first arc guiding piece 11 form a U-shaped structure.
[0041] Referring to Figure 5 When the movable contact 611 of the movable contact 61 and the stationary contact 231 of the stationary contact 20 are separated, an arc 15 is generated between the movable contact 61 and the stationary contact 20. When the movable contact 61 rotates in the direction S2, the arc 15 moves from the stationary contact 20 to the first arc guiding piece 11. At the same time, the current flowing from the incoming terminal 91, indicated by the dashed arrow C, flows to the first arc guiding piece 11. The current flowing in the first arc guiding piece 11 generates a magnetic field around the first arc guiding piece 11, which generates a magnetic blowing force indicated by the arrow F on the arc 15, so that the arc 15 can quickly enter the arc extinguishing chamber 801 to be extinguished. Thus, the on-off performance and the electrical operating performance of the contact assembly 100 are improved.
[0042] Referring to Figure 1 and Figure 5 In some embodiments, the third section 23 includes a main body part 232, the first end of the third section 23 corresponds to the first end of the main body part 232, and the second end of the third section 23 corresponds to the second end of the main body part 232. The stationary contact 231 is located at the second end of the main body part 232 and protrudes relative to the main body part 232. An arc guiding protrusion 233 is further provided on the main body part 232, and the arc guiding protrusion 233 extends from the side wall of the stationary contact 231 to the first end of the main body part 232. When the stationary contact 20 is in the first open position, the surface of the first arc guiding piece 11 facing the arc extinguishing grid piece group 13 is close to the surface of the arc guiding protrusion 233, which is more conducive to the arc 15 moving from the stationary contact 231 of the stationary contact 20 to the first arc guiding piece 11 through the arc guiding protrusion 233, thereby avoiding excessive ablation of the stationary contact 231 by the arc.
[0043] In some embodiments, the contact assembly 100 can further include a shield 50 disposed between the first segment 21 and the first arc striking tab 11. The shield 50 is used to shield the magnetic field generated by the current passing through the first segment 21 and the second segment 22, so as to avoid the adverse effect of the magnetic field generated by the current passing through the first segment 21 and the second segment 22 on the movement of the electric arc 15 to the arc extinguishing chamber 801.
[0044] Referring to Figure 6 , the movable contact 61 is rotated to the second open position and is kept in the second open position by the operating mechanism connected with the movable contact holder 62. At this time, the movable contact 61 is close to the second arc striking tab 12, and the electric arc 15 can move to the arc extinguishing chamber 801 through the second arc striking tab 12 to be cut by the arc extinguishing grid piece group 13.
[0045] Figure 7 A variant embodiment of the contact assembly 100 is shown. The structure of the contact assembly 100 can refer to the structure of the contact assembly 100 in the foregoing description in the case of no conflict.
[0046] In Figure 7 the embodiment shown, the stationary contact 20 can not be provided with the fourth segment 24, and the first braid 31 can be directly connected with the first segment 21. By changing the connection position of the first braid 31 with the stationary contact 20, on the one hand, the structure of the stationary contact 20 can be simplified, and on the other hand, the temperature rise of the stationary contact 20 can be improved.
[0047] The contact assembly 100 can further include a gas generating piece 70 located on both sides of the rotation track of the movable contact 61. When the movable contact 61 and the stationary contact 20 are separated, the gas generating piece 70 is burned by the electric arc 15 to generate a large amount of gas, which causes the pressure in the arc extinguishing chamber 801 to rise, forms a pressure difference with the outside of the arc extinguishing chamber 801, and the gas flows from the arc extinguishing chamber 801 to the outside of the arc extinguishing chamber 801, forming a gas blowing effect on the electric arc 15, further helping the electric arc 15 to quickly enter the arc extinguishing chamber 801 to be extinguished. This can further improve the on-off performance of the contact assembly 100. It can be understood that the gas generating piece 70 is also applicable to the contact assembly 100 described in Figures 1 to 6 .
[0048] According to the embodiments of the present disclosure, a double power transfer switch is also provided, which includes a breaking device including two contact assemblies 100 according to the embodiments of the present disclosure.
[0049] In the contact assembly 100 according to the embodiments of the present disclosure, when the static contact 20 and the moving contact 61 are separated, the static contact 20 can be rotated about the first pivot 201 to a first open position. At the first open position, the first segment 21 and the second segment 22 of the static contact 20 and the first arc guiding piece 11 of the arc extinguishing assembly 10 form a U-shaped structure, and the current enters the first arc guiding piece 11 through the second segment 22 of the static contact 20 and generates a magnetic field around the first arc guiding piece 11. The magnetic field generates a magnetic blowing force on the arc 15 between the static contact 20 and the moving contact 61 to move into the arc extinguishing chamber 801, thereby helping to quickly extinguish the arc 15 and helping to improve the on-off performance of the contact assembly 100.
[0050] In addition, the moving contact 61 and the moving contact bracket 62 are fixed together, and the moving contact 61 can be kept at the first closed position by an operating mechanism connected with the moving contact bracket 62. In this way, when overcurrent occurs in the circuit, the moving contact 611 of the moving contact 61 and the static contact 231 of the static contact 20 abut against each other instead of being immediately separated, thus making the contact assembly 100 have higher short-time withstand current performance.
[0051] It can be understood that the double power transfer switch applying the contact assembly 100 has good electrical operation performance, on-off performance and short-time withstand current performance.
[0052] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications or improvements to the technology in the market, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.
Claims
1. A contact assembly (100) of a disconnector device for a double-pole changeover switch, characterized in that Comprising: an arc extinguishing assembly (10) comprising an arc extinguishing vane group (13) located in an arc extinguishing chamber (801) and a first arc striking vane (11) and a second arc striking vane (12) located at both ends of the arc extinguishing chamber (801); a stationary contact (20) connected with a line terminal (91) through a first braid wire (31) and sleeved on a first pivot (201), the stationary contact (20) being capable of rotating between a first closed position and a first open position, wherein the stationary contact (20) comprises: a first section (21) opposite to the first arc striking vane (11), a first end of the first section (21) being pivotally connected with the first pivot (201); a second section (22) having a first end connected with a second end of the first section (21) and a second end extending towards the first arc striking vane (11); and a third section (23) having a first end connected with a second end of the second section (22) and a second end extending away from the first arc striking vane (11), the third section (23) being provided with a stationary contact point (231), the first end of the third section (23) being close to the first arc striking vane (11) when the stationary contact (20) is in the first open position; and a contact pressure piece (40) elastically abutting against the stationary contact (20) to apply a force to the stationary contact (20) to move towards the first open position. Further comprising a shielding piece (50) arranged between the first section (21) and the first arc striking vane (11).
2. The contact assembly (100) of claim 1, characterized in that Further comprising:
3. The contact assembly (100) according to claim 1 or 2, characterized in that a movable contact (61) provided with a movable contact point (611); and a movable contact support (62) fixedly connected with the movable contact (61) and connected with a load terminal (92) through a second braid wire (32), and wherein the movable contact support (62) is sleeved on a second pivot (601) so that the movable contact (61) is capable of rotating between a second closed position and a second open position, the movable contact point (611) abutting against the stationary contact point (231) to hold the stationary contact (20) on the first closed position when the movable contact (61) is in the second closed position. Further comprising a gas generating vane (70) located on both sides of a rotation track of the movable contact (61).
4. The contact assembly (100) of claim 3, characterized in that 5. The contact assembly (100) according to claim 1 or 2, wherein: the third section (23) comprises a main body portion (232), the stationary contact point (231) being located at a second end of the main body portion (232) and protruding relative to the main body portion (232), and the main body portion (232) is further provided with an arc striking protrusion (233) extending from a side wall of the stationary contact point (231) to a first end of the main body portion (232). the contact pressure piece (40) comprises an elastic piece (41) abutting against the third section (23).
6. The contact assembly (100) of claim 1 or 2, characterized in that the contact pressure piece (40) further comprises:
7. The contact assembly (100) of claim 6, characterized in that a fixed plate (42) arranged on a housing (80) of the breaking device; and A support member (43) is connected with the fixed plate (42), and the elastic member (41) is sleeved on the support member (43).
8. The contact assembly (100) of claim 1 or 2, characterized in that The fixed contact (20) further comprises a fourth section (24) extending from a first end of the first section (21) in a direction away from the first section (21), and the first braid wire (31) is connected with the fourth section (24).
9. The contact assembly (100) of claim 1 or 2, characterized in that, The first braid wire (31) is connected with the first section (21).
10. A dual power transfer switch, characterized by The dual power transfer switch comprises a disconnecting device, and the disconnecting device comprises two contact assemblies (100) of the disconnecting device according to any one of claims 1 to 9.