Multi-breakpoint contact system and isolating switch

Abstract

The invention relates to the technical field of low-voltage electric appliances, in particular to a multi-breakpoint contact system and an isolating switch, and the system comprises at least two moving contact assemblies and a static contact assembly. The at least two moving contact assemblies are arranged at intervals along the linear direction; the moving contact assembly comprises a contact supporting piece and a moving contact arranged on the contact supporting piece; the contact supporting piece is driven to drive the moving contact to rotate, so that the moving contact and a static contact assembly arranged on a rotating path of the moving contact are switched on or switched off; and the movement axis of the contact supporting piece is vertical to the linear direction. Through a brand-new structural layout, compact layout can be realized, the product size can be reduced, multi-breakpoint isolation can also be realized, and the opening isolation distance can be increased.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a multi-breakpoint contact system and an isolating switch. Background Art

[0002] At present, electrical switches are widely used in power systems to provide obvious disconnection points during circuit maintenance or isolation to ensure the safety of operators. However, electrical switches in the prior art usually adopt a double-breakpoint structure design, which has the problem of insufficient breakpoint spacing in actual applications. For this reason, existing electrical switches increase the disconnection points by connecting them in series externally. This not only increases the connection points and increases the complexity of the current path, but also aggravates the temperature rise problem of the overall structure, affecting the reliability of equipment operation. In addition, because the moving contacts are arranged along the rotation direction of the moving contact rotation axis, this structure occupies a large width space. For example, the width of an electrical switch with a rated current of 250A usually reaches 105mm, which is not conducive to the development trend of electrical equipment towards miniaturization and compactness.

[0003] In high-voltage applications, such as those with DC voltages up to 3000V or higher, existing electrical switches face significant challenges in terms of interrupting performance. In particular, during critical current testing, arc extinguishing at low currents is difficult, requiring a large contact distance. For example, in a traditional double-breakpoint structure, the distance between a single breakpoint is approximately 30mm, and when two breakpoints are connected in series, the total distance is 60mm to meet insulation and arc extinguishing requirements. This further limits the miniaturization of the switch design and implementation.

[0004] Therefore, how to realize a multi-breakpoint structure inside the switch while avoiding an increase in the overall size due to an unreasonable structural layout has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The purpose of this application is to provide a multi-breakpoint contact system and an isolating switch, which, through a new structural layout, can not only achieve a compact layout and reduce product size, but also achieve multi-breakpoint isolation and increase the disconnection distance.

[0006] The embodiment of the present application is implemented as follows: The multi-breakpoint contact system provided in an embodiment of the present application includes at least two moving contact assemblies and a static contact assembly; at least two of the moving contact assemblies are arranged at intervals along a straight line direction; the moving contact assembly includes a contact support and a moving contact arranged on the contact support; the contact support is driven to move the moving contact, so that the moving contact and the static contact assembly arranged on the moving contact movement path are closed or opened; the movement axis of the contact support is perpendicular to the straight line direction.

[0007] As an optional embodiment, two moving contacts are provided on each of the contact support members; when the contact support member moves to the opening position, at least four moving contacts are separated from the static contact assembly, forming at least four breakpoints; the contact support member is driven to rotate, and the moving contacts extend radially along the contact support member.

[0008] As an optional embodiment, the static contact assembly includes a first static contact located between two contact supports; the first static contact includes two first static contact portions and a connecting portion; one end of the connecting portion extends toward one contact support and the other end extends toward the other contact support; the two first static contact portions are respectively arranged at both ends of the connecting portion.

[0009] As an optional embodiment, one end of the first static contact portion is connected to the connecting portion and the other end extends away from the connecting portion; the extension directions of the two first static contact portions are parallel and opposite to each other.

[0010] As an optional embodiment, the static contact assembly includes a second static contact located on the side of the contact support away from the first static contact; a second static contact portion is provided on the second static contact; the second static contact portion and the first static contact portion close to the contact support are rotationally symmetrically arranged about the movement axis.

[0011] As an optional embodiment, the moving contact assembly and the static contact assembly are arranged in a straight line direction to form a single-layer multi-breakpoint structure; there are at least two single-layer multi-breakpoint structures arranged in sequence along the extension direction of the moving axis; and two adjacent single-layer multi-breakpoint structures are electrically connected in series.

[0012] As an optional embodiment, the second static contact includes a U-shaped series structure, and the second static contact parts are respectively provided at both ends of the U-shaped series structure; in the closed position, one second static contact part abuts against the moving contact in a single-layer multi-breakpoint structure, and the other second static contact part abuts against the moving contact in another single-layer multi-breakpoint structure, so that the two adjacent single-layer multi-breakpoint structures are electrically connected in series.

[0013] As an optional implementation, two adjacent single-layer multi-breakpoint structures are arranged in a plane symmetrically.

[0014] As an optional implementation, in the linear direction, the rotation planes of adjacent contact supports coincide with each other.

[0015] An embodiment of the present application further provides an isolating switch, comprising a switch housing and the multi-breakpoint contact system as described above disposed in the switch housing.

[0016] The beneficial effects of the embodiments of the present application include: The multi-breakpoint contact system provided by the embodiment of the present application arranges at least two moving contact assemblies in a linear direction at intervals. Since the linear arrangement direction is perpendicular to the width direction of the isolating switch, the width dimension of the switch can be effectively reduced. While optimizing the width dimension of the switch, the embodiment of the present application greatly increases the disconnection distance of the contact system through the design of at least two moving contact assemblies, thereby greatly improving the breaking capacity of the switch. The contact support of the embodiment of the present application is driven to move the moving contact, so that the moving contact and the static contact assembly arranged on the moving contact movement path are closed or opened; and the movement axis of the contact support is perpendicular to the linear arrangement direction. Through the above-mentioned arrangement, the embodiment of the present application can improve space utilization. It improves space utilization efficiency through the structural layout of the rotating moving contact and the static contact assembly arranged in a linear direction. At the same time, it eliminates structural parts such as the slide rail inside the electrical switch housing, so that the structure is simplified, which is conducive to miniaturization of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a structural schematic diagram of a single-layer multi-breakpoint structure in a closed position according to an embodiment of the present application; Figure 2 This is a structural schematic diagram of a single-layer multi-breakpoint structure in an open position according to an embodiment of the present application; Figure 3 This is a schematic structural diagram of the first static contact in an embodiment of the present application; Figure 4 This is a structural diagram of the double-layer multi-breakpoint structure in the open position according to an embodiment of the present application; Figure 5 This is a structural schematic diagram of a double-layer multi-breakpoint structure in a closed position according to an embodiment of the present application; Figure 6 This is a schematic structural diagram of a U-shaped series structure according to an embodiment of the present application; Figure 7 This is one of the overall structural diagrams of the multi-breakpoint contact system according to an embodiment of the present application; Figure 8 This is the second schematic diagram of the overall structure of the multi-breakpoint contact system according to an embodiment of the present application.

[0019] Icons: 100-moving contact assembly; 101-static contact assembly; 102-straight direction; 103-contact support; 104-moving contact; 105-first static contact; 106-first static contact portion; 107-connecting portion; 108-second static contact; 109-second static contact portion; 110-single-layer multi-breakpoint structure; 111-U-type series structure; 112-switch housing; 113-mechanism assembly; 114-terminal block. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," "third," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0023] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] Existing electrical switches typically employ a dual-breakpoint design, which, in practice, suffers from insufficient breakpoint spacing. To address this, existing switches employ external series connections to increase the number of disconnect points. This not only increases the complexity of the current path by increasing the number of connection points, but also exacerbates overall temperature rise, impacting device reliability. Furthermore, this structural design occupies a significant width. For example, a 250A rated switch typically has a width of 105mm, hindering the trend toward miniaturization and compactness in electrical equipment.

[0025] In order to solve the above technical problems, an embodiment of the present application provides a multi-breakpoint contact system.

[0026] Reference Figure 1 、 Figure 2 As shown, the multi-breakpoint contact system provided by the embodiment of the present application includes at least two moving contact assemblies 100 and a static contact assembly 101; the at least two moving contact assemblies 100 are arranged at intervals along a straight line direction 102; the moving contact assembly 100 includes a contact support 103 and a moving contact 104 arranged on the contact support 103; the contact support 103 is driven to move the moving contact 104, so that the moving contact 104 and the static contact assembly 101 arranged on the movement path of the moving contact 104 are closed or opened; the movement axis of the contact support 103 is perpendicular to the straight line direction 102.

[0027] It should be noted that the multi-break contact system provided in the embodiment of the present application can be applied to an electrical switch. For example, the multi-break contact system provided in the embodiment of the present application is installed in an isolating switch.

[0028] It should be noted that the specific direction of the linear direction 102 can be set by those skilled in the art as needed. The motion axis is the rotation axis of the contact support 103. For example, it can be horizontal or vertical.

[0029] It should be noted that by arranging at least two movable contact assemblies 100 spaced apart along a straight line 102, this design not only increases the number of breakpoints, thereby improving insulation performance and breaking capacity, but also makes the overall structure more compact. In particular, when the axis of the contact support 103 is perpendicular to this direction, the overall width of the switch can be effectively reduced while maintaining high electrical performance.

[0030] The embodiments of the present application solve the problem of increased width of traditional multi-breakpoint switches due to increased opening distance, and due to the use of an optimized directional layout, the width of the multi-breakpoint isolation switch is effectively reduced, which is conducive to achieving a miniaturized design.

[0031] It should be noted that the moving contact 104 is mounted on the contact support 103, and the contact support 103 is driven to drive the moving contact 104 to perform closing or opening operations. This approach reduces the space requirement of the mechanical transmission part, simplifies the internal structure, and helps to improve the compactness of the layout.

[0032] Compared with the traditional linear motion drive mechanism, the rotary drive mode occupies less space, especially in the rotation plane of the moving contact 104, achieving a more compact design.

[0033] The arrangement of the contact support 103 in the embodiment of the present application, in which the axis of motion is perpendicular to the linear direction 102, allows each movable contact 104 to operate independently while maintaining the compactness of the overall structure. This ensures that even when the number of breakpoints is increased, the width of the device will not be significantly increased.

[0034] The beneficial effects that can be produced by the embodiments of the present application are: First, the embodiment of the present application can effectively reduce the width dimension. By arranging multiple moving contact assemblies 100 along a certain direction and adopting a vertical rotation drive method, it can effectively reduce the overall width of the disconnector, which is particularly important for application scenarios that require a highly compact design.

[0035] Second, the embodiments of the present application improve space utilization. This is achieved by arranging the rotating movable contact 104 and the stationary contact assembly 101 in a straight line. This arrangement also eliminates components such as the internal slide rails of the disconnector housing 112, simplifying the structure. Within the same volume, the embodiments of the present application can accommodate more functional components, such as an arc-extinguishing assembly to extinguish arcs between the movable contact 104 and the stationary contact assembly 101. Alternatively, the switch can be significantly reduced in size while still meeting the same functional requirements.

[0036] Third, the embodiments of the present application can enhance the applicability of the product. Through its miniaturized and low-width design, the isolating switch is more suitable for use in environments with strict space restrictions, such as data centers, new energy photovoltaics and other emerging fields, thereby improving the market competitiveness of the product.

[0037] In this embodiment of the present application, at least two movable contact assemblies 100 are arranged spaced apart along a linear direction 102. The linear direction is not the rotational direction of the movable contact assembly 100 but rather a direction perpendicular to the operating axis of the movable contact assembly 100. This arrangement allows for multiple movable and static contacts to be disconnected in a small space, increasing the density of disconnect points per unit space, effectively increasing the disconnection distance of the contact system, and enhancing arc extinguishing capability. Furthermore, this embodiment of the present application optimizes the width of the switch and achieves a compact design of the entire switch through a compact layout.

[0038] As an optional embodiment, each contact support 103 is provided with two moving contacts 104; when the contact support 103 moves to the opening position, at least four moving contacts 104 are separated from the static contact assembly 101, forming at least four break points.

[0039] In the embodiment of the present application, two movable contacts 104 are provided on each contact support 103. These two movable contacts 104 respectively cooperate with corresponding static contacts. This design of the embodiment of the present application increases the breakpoint density per unit space, enabling more breakpoint combinations to be achieved without increasing the number of contact supports 103.

[0040] It should be noted that after being driven, the contact support 103 rotates a certain angle, causing the movable contact 104 to separate from its paired static contact, completing the opening action. Multiple contact supports 103 rotate synchronously to ensure that all movable contacts 104 move in unison, allowing them to separate from the static contacts simultaneously.

[0041] For example, there are two or three contact holders 103 arranged in sequence along a straight line 102. Each contact holder 103 is provided with two moving contacts 104. Each contact holder 103 is provided with a static contact corresponding to the moving contact 104 on both sides. All contact holders 103 rotate simultaneously, wherein each contact holder 103 drives the two moving contacts 104 to move to the closed position, and all moving contacts 104 maintain contact with the corresponding static contacts. In the open position, all moving contacts 104 remain separated from the corresponding static contacts, forming at least four breakpoints.

[0042] Since each contact support 103 has two moving contacts 104, at least four breakpoints can be formed in the open state. These breakpoints are arranged sequentially along the current path, jointly performing voltage isolation tasks, improving overall insulation capacity and arc extinguishing efficiency. The spacing of each breakpoint can be designed as needed. For example, a single breakpoint spacing of 30mm can create a total spacing of 120mm for four breakpoints. If three moving contact assemblies 100 are arranged sequentially and spaced apart along a straight line 102, six breakpoints can be generated.

[0043] It should be noted that in order to improve the breaking capacity, the distance between individual breakpoints can be increased, but this will significantly increase the size of the switch.

[0044] The embodiments of the present application can improve interruption reliability under high voltage conditions. In high DC voltage scenarios (e.g., 3000V and above), traditional dual-breakpoint structures often struggle to meet critical current testing requirements, especially when arcs are difficult to extinguish under low current conditions. By increasing the number of breakpoints to four or more, the embodiments of the present application can effectively increase the total insulation distance and enhance arc extinguishing capability without increasing the spacing between individual breakpoints.

[0045] This embodiment improves the breakpoint density by integrating multiple moving contacts 104 on a single contact support 103, avoiding the practice of simply relying on increasing the structural length to obtain higher performance.

[0046] Reference Figure 2 、 Figure 4 As shown, the contact support 103 is driven to rotate, and the movable contact 104 extends along the radial direction of the contact support 103 .

[0047] It should be noted that the above arrangement can effectively extend the moving contact 104. Since the free end of the moving contact 104 abuts against the static contact portion, the extension of the moving contact 104 can increase the opening distance of a single breakpoint, further enhancing the breaking capacity of the contact system.

[0048] Reference Figure 1 、 Figure 2 As shown, as an optional embodiment, the static contact assembly 101 includes a first static contact 105 located between two contact supports 103; the first static contact 105 includes two integrally formed first static contact portions 106 and a connecting portion 107; one end of the connecting portion 107 extends toward one contact support 103 and the other end extends toward the other contact support 103; the two first static contact portions 106 are respectively arranged at both ends of the connecting portion 107.

[0049] It should be noted that the first static contact 105 of the present embodiment is integrally machined or cast from a conductive material, rather than assembled from multiple components, which improves structural strength and conductivity. The one-piece design reduces issues such as contact resistance, looseness, and temperature rise that may arise in traditional spliced ​​structures.

[0050] Regarding the description of the connecting portion 107, the connecting portion 107 extends from the middle toward the left and right contact supports 103. The exemplary connecting portion 107 can extend along the straight direction 102. The connecting portion 107 serves as an intermediate support and conductor to connect the two static contact portions together and maintain their spatial position stable.

[0051] In the prior art, multiple breakpoints usually require multiple independent static contacts, which are connected in series through external connectors, which can easily cause problems such as poor contact and heating.

[0052] It should be noted that the embodiment of the present application adopts an integrally formed first static contact 105, which eliminates additional connectors and reduces the number of external connection points, thereby effectively reducing potential sources of temperature rise and improving operational reliability.

[0053] In addition, the one-piece molded structure in the embodiment of the present application has higher mechanical strength and a more stable conductive path than the spliced ​​structure, and is suitable for frequent operations under high voltage and high current conditions.

[0054] The two first static contact portions 106 and the connecting portion 107 may also be connected together by connecting members such as rivets as needed.

[0055] Reference Figure 2 、 Figure 3 As shown, as an optional embodiment, one end of the first static contact portion 106 is connected to the connecting portion 107 and the other end extends away from the connecting portion 107; the extension directions of the two first static contact portions 106 are parallel and opposite.

[0056] It should be noted that one end of the first static contact portion 106 is connected to the connecting portion 107, which means that one end of each first static contact portion 106 is directly connected to the connecting portion 107, forming an integral structure. Through this design, the embodiment of the present application ensures that current can be smoothly transferred from one static contact portion to another, reducing resistance and heat generation.

[0057] The other end of the first static contact portion 106 extends away from the connecting portion 107. In other words, the first static contact portion 106 is not closely attached to or close to the connecting portion 107, but rather extends outward, which helps to increase the contact area between the moving contact 104 and the static contact and provides sufficient space to achieve the safety distance requirement during operation.

[0058] It should be noted that the two static contact portions extend in opposite directions and remain parallel. This not only makes the entire static contact assembly 101 more compact but also allows for more efficient use of space. Furthermore, the parallel and opposite design helps balance pressure distribution on both sides, reducing mechanical stress concentration issues caused by asymmetry.

[0059] Reference Figure 2 As shown, as an optional embodiment, the static contact assembly 101 includes a second static contact 108 located on the side of the contact support 103 away from the first static contact 105; a second static contact portion 109 is provided on the second static contact 108; the second static contact portion 109 and the first static contact portion 106 close to the contact support 103 are rotationally symmetrically arranged about the movement axis.

[0060] Among them, reference Figure 1 、 Figure 2 As shown, the moving contact assembly 100 and the static contact assembly 101 are arranged in sequence in a straight line direction 102 to form a single-layer multi-breakpoint structure 110; Figure 4 、 Figure 5As shown, there are at least two single-layer multi-breakpoint structures 110 arranged in sequence along the extension direction of the movement axis; the two adjacent single-layer multi-breakpoint structures 110 are electrically connected in series.

[0061] It should be noted that the single-layer multi-breakpoint structure 110 refers to an electrical unit with multiple breakpoints, formed by the movable contact assembly 100 and the corresponding static contact assembly 101 arranged in a specific pattern within a single plane. Each movable contact assembly 100 rotates to disconnect the two movable contacts 104 from the first static contact portion 106 and the second static contact portion 109, respectively, forming two breakpoints. This achieves high-density breakpoint integration on a single layer.

[0062] It should be noted that, in the linear direction 102 , the rotation planes of adjacent contact supports 103 coincide with each other.

[0063] In other words, the single-layer multi-breakpoint structure 110 is located on the rotation plane formed by the contact support 103 of the layer.

[0064] Furthermore, at least two single-layer multi-breakpoint structures 110 are provided in the direction of extension of the motion axis, and these structures are electrically connected in series. Therefore, the present embodiment can stack multiple independent breakpoint layers and connect them via conductors, so that the current must pass through all breakpoints in each layer in sequence.

[0065] It should be noted that the embodiments of the present application can significantly improve electrical isolation capability by compactly stacking at least two single-layer multi-breakpoint structures 110. The multi-breakpoint series structure increases the total disconnect distance and insulation strength, enhancing disconnect reliability under high voltage, low current conditions.

[0066] For example, refer to Figure 4 、 Figure 5 As shown, two adjacent single-layer multi-breakpoint structures 110 are arranged in a plane symmetrical manner, and the two adjacent single-layer multi-breakpoint structures 110 are set closely to avoid increasing unnecessary width dimensions.

[0067] Reference Figure 5 、 Figure 6 As shown, as an optional embodiment, the second static contact 108 includes a U-shaped series structure 111, and a second static contact portion 109 is provided at both ends of the U-shaped series structure 111; in the closed position, one second static contact portion 109 abuts against the moving contact 104 in a single-layer multi-breakpoint structure 110, and the other second static contact portion 109 abuts against the moving contact 104 in another single-layer multi-breakpoint structure 110, so that the two adjacent single-layer multi-breakpoint structures 110 are electrically connected in series.

[0068] It should be noted that the U-shaped series structure 111 can establish electrical connections between different single-layer multi-breakpoint structures 110 to achieve the function of electrical series connection.

[0069] It should be noted that the U-shaped series structure 111 of the present embodiment can be integrally formed. This means that the entire second static contact 108 assembly can be manufactured in a single molding process, without the need for additional splicing or welding steps. The design of the U-shaped series structure 111 ensures stable electrical connection between the different single-layer multi-breakpoint structures 110, avoiding the risk of poor contact or looseness caused by splicing multiple independent components.

[0070] Therefore, the embodiment of the present application improves the structural strength and conductive performance of the U-shaped series structure 111 through integral molding, and reduces the potential contact resistance and temperature rise problems between two adjacent single-layer multi-breakpoint structures 110.

[0071] Reference Figure 7 、 Figure 8 As shown, the isolating switch provided in the embodiment of the present application further includes a switch housing 112 and a mechanism assembly 113. The mechanism assembly 113, the moving contact assembly 100, and the static contact assembly 101 are all disposed in the switch housing 112. The switch housing 112 can be configured as a rectangular structure. The mechanism assembly 113 is linked to the contact support 103 of the moving contact assembly 100 to control the rotation of the contact support 103. Figure 8 This is a schematic diagram showing that all four breakpoints are in the open position. Figure 7 Schematic diagram of two single-layer multi-breakpoint structures 110 with a total of 8 breakpoints in the closed position.

[0072] Reference Figure 7 As shown, two single-layer multi-breakpoint structures 110 are connected to the mechanism assembly 113 on one side through a U-shaped series structure 111, and two terminal blocks 114 extending to the outside of the switch housing 112 are set on the other side, where the two terminal blocks 114 respectively correspond to the static contact assemblies 101 of the two single-layer multi-breakpoint structures 110 for external wiring.

[0073] The mechanism component 113 is not particularly limited here, and those skilled in the art can configure it as needed.

[0074] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A multi-breakpoint contact system, characterized in that: The invention comprises at least two moving contact assemblies (100) and a static contact assembly (101); at least two of the moving contact assemblies (100) are arranged at intervals along a straight line direction (102); the moving contact assembly (100) comprises a contact support (103) and a moving contact (104) arranged on the contact support (103); the contact support (103) is driven to move the moving contact (104), so that the moving contact (104) and the static contact assembly (101) arranged on the moving contact (104) movement path are closed or opened; the movement axis of the contact support (103) is perpendicular to the straight line direction (102).

2. The multi-breakpoint contact system according to claim 1, characterized in that: Each of the contact support members (103) is provided with two movable contacts (104); when the contact support member (103) moves to the opening position, at least four movable contacts (104) are separated from the static contact assembly (101), forming at least four breakpoints; when the contact support member (103) is driven to rotate, the movable contacts (104) extend radially along the contact support member (103).

3. The multi-breakpoint contact system according to claim 1, characterized in that: The static contact assembly (101) includes a first static contact (105) located between two contact supports (103); the first static contact (105) includes two first static contact portions (106) and a connecting portion (107); one end of the connecting portion (107) extends toward one contact support (103) and the other end extends toward the other contact support (103); the two first static contact portions (106) are respectively provided at the two ends of the connecting portion (107).

4. The multi-breakpoint contact system according to claim 3, characterized in that: One end of the first static contact portion (106) is connected to the connecting portion (107), and the other end extends in a direction away from the connecting portion (107); the extension directions of the two first static contact portions (106) are parallel and opposite.

5. The multi-breakpoint contact system according to claim 3, characterized in that: The static contact assembly (101) comprises a second static contact (108) located on a side of the contact support (103) facing away from the first static contact (105); a second static contact portion (109) is provided on the second static contact (108); the second static contact portion (109) and the first static contact portion (106) close to the contact support (103) are arranged rotationally symmetrically about a movement axis.

6. The multi-breakpoint contact system according to claim 5, characterized in that: The moving contact assembly (100) and the static contact assembly (101) are arranged in a straight line direction (102) to form a single-layer multi-breakpoint structure (110); there are at least two single-layer multi-breakpoint structures (110) arranged in sequence along the extension direction of the moving axis; and two adjacent single-layer multi-breakpoint structures (110) are electrically connected in series.

7. The multi-breakpoint contact system according to claim 6, characterized in that: The second static contact (108) comprises a U-shaped series structure (111), and the second static contact parts (109) are respectively provided at both ends of the U-shaped series structure (111); in the closed position, one second static contact part (109) abuts against a moving contact (104) in a single-layer multi-breakpoint structure (110), and the other second static contact part (109) abuts against a moving contact (104) in another single-layer multi-breakpoint structure (110), so that the two adjacent single-layer multi-breakpoint structures (110) are electrically connected in series.

8. The multi-breakpoint contact system according to claim 6 or 7, characterized in that: Two adjacent single-layer multi-breakpoint structures (110) are arranged in a plane symmetrical manner.

9. The multi-breakpoint contact system according to claim 1, characterized in that: In the straight direction (102), the rotation planes of adjacent contact supports (103) coincide.

10. An isolating switch, characterized in that: The invention comprises a switch housing (112), and a multi-breakpoint contact system according to any one of claims 1 to 9, which is arranged in the switch housing (112).

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