Load switch for switch cabinet and switch cabinet

Abstract

The invention relates to a load switch for a switch cabinet and the switch cabinet. The load switch includes: a bracket; the three-position switch comprises a first static contact and a grounding static contact which are fixedly arranged on the bracket; the first moving contact is rotatably arranged on the support, and the first moving contact is provided with a closing position jointed with the first static contact, a grounding position jointed with the grounding static contact, and an isolation position between the first static contact and the grounding static contact; the vacuum arc-extinguishing chamber is connected with the three-position switch in parallel and comprises a shell, a second static contact and a second moving contact which are arranged in the shell, and the second moving contact is connected with a moving conductive rod extending out of the shell; and the first shielding piece is arranged near the shell in a manner of equipotential with the movable conducting rod, and the first shielding piece is provided with an opening for the second movable contact to pass through so as to provide electric field shielding during the switching-on and switching-off period.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, and more particularly to load switches and switchgear for use in switchgear cabinets. Background Technology

[0002] Load switches are key operating devices in power systems. Their functions generally include safely switching rated load current and limited overload current, and in some cases, providing visible isolation to ensure the safe operation and maintenance of power equipment. Load switches are used in various scenarios, including distribution line switching, and are particularly prevalent in renewable energy grid connection and urban ring main units. A drawback of traditional load switches is that during opening, distortion of the electric field in the contact gap can easily lead to arc reignition or insulation breakdown, causing power equipment failure. This defect is especially prominent in scenarios involving frequent opening and closing operations.

[0003] Therefore, there is a demand in the industry for the development of new load switch electric field shielding solutions, which are expected to improve the operation and maintenance safety of power equipment by optimizing the electric field distribution path and improving the insulation reliability of load switches. Summary of the Invention

[0004] The present invention aims to provide a load switch for switchgear, which can at least solve some of the above-mentioned technical problems.

[0005] The present invention also aims to provide a switch cabinet that applies the above-described improved load switch.

[0006] According to one aspect of the present invention, a load switch for a switchgear is provided, comprising: a bracket; a three-position switch including: a first stationary contact and a grounding stationary contact fixed to the bracket; and a first moving contact rotatably disposed on the bracket, wherein the first moving contact has a closed position engaging with the first stationary contact, a grounding position engaging with the grounding stationary contact, and an isolated position between the first stationary contact and the grounding stationary contact; a vacuum interrupter connected in parallel to the three-position switch, and comprising: a housing; a second stationary contact and a second moving contact disposed within the housing, wherein the second moving contact is connected to a moving conductive rod extending out of the housing; and a first shielding member disposed near the housing at the same potential as the moving conductive rod, the first shielding member having an opening through which the second moving contact passes to provide electric field shielding during interruption.

[0007] The load switch provided in this solution achieves a dual improvement in insulation reliability and operational stability of the power equipment through the synergistic effect of a parallel structure of a three-position switch and a vacuum interrupter, as well as a dynamic electric field shielding mechanism. The first shielding component surrounds the first stationary contact with a double-sided configuration and completely encloses the contact area of ​​the first moving contact when in the closed position, thus forming a closed electric field shield. This reduces the peak electric field strength at the contact edge and effectively suppresses the risk of arc reignition caused by electric field distortion during the opening of the first moving and stationary contacts. Furthermore, the gap structure of the first shielding component can precisely match the movement trajectory of the first moving contact, making it particularly suitable for frequent operation scenarios in new energy ring main units. This solution improves the insulation reliability of the load switch while enabling long-term stable operation of the load switch in environments with frequent operation and high electromagnetic interference.

[0008] In some embodiments, a second shield is provided at the end of the first stationary contact to be engaged with the first moving contact. The second shield surrounds the first stationary contact from at least two opposite sides and defines a gap for accommodating the first moving contact. When the first moving contact is in the closed position, the second shield completely covers the end of the first moving contact that is engaged with the first stationary contact.

[0009] In some embodiments, the load switch includes an actuation mechanism connected to the moving conductive rod, the actuation mechanism being configured to drive a second moving contact away from a second stationary contact in response to movement of the first moving contact from the closed position to the closed position, and configured to drive the second moving contact closer to the second stationary contact in response to movement of the first moving contact from the closed position to the closed position, wherein the first shielding member has a base surrounding the housing and an extension integrally extending from the base, the base defining an opening for receiving the moving conductive rod, and the extension at least covering the metal part of the actuation mechanism.

[0010] In some embodiments, the load switch includes a holding mechanism for holding the first moving contact in the isolated position, and includes a third shield disposed at the isolated position, wherein when the first moving contact moves to the isolated position, the third shield surrounds the first moving contact from at least opposite sides.

[0011] In some embodiments, the static conductive rod connected to the second static contact extends out of the housing, and the load switch includes a fourth shielding member disposed at the end of the housing. The fourth shielding member is a circumferentially closed integral molded part and has a through hole for fixing the static conductive rod.

[0012] In some embodiments, the fourth shielding member has a circumferentially continuous and closed peripheral body portion and a transverse joining portion integrally extending inward from the peripheral body portion, the outer surface of the peripheral body portion being a curved surface configuration, the through hole being formed in the transverse joining portion, and the end face of the second end of the housing abutting the transverse joining portion.

[0013] In some embodiments, the lateral joining portion is integrally connected to the peripheral body portion via a smooth transition section that forms a groove structure extending around the lateral joining portion, such that the lateral joining portion is configured as a boss protruding inside the peripheral body portion, and the second end of the housing is inserted into a recess formed by the boss.

[0014] In some embodiments, the first moving contact is provided with a fifth shielding member, which surrounds the first moving contact from at least two opposite sides.

[0015] In some embodiments, the first moving contact includes a lower segment extending from the midpoint toward the support and an upper segment extending from the midpoint away from the support, wherein the fifth shield is disposed on the upper segment of the first moving contact.

[0016] According to another aspect of the present invention, a switch cabinet is provided, including the aforementioned load switch.

[0017] Other features and advantages of the present invention will partly become apparent to those skilled in the art upon reading this application, and partly will be described in conjunction with the accompanying drawings in the detailed description below. Attached Figure Description

[0018] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of a load switch according to an embodiment of the present invention, wherein only one set of three-position switches and vacuum interrupters is shown for clarity;

[0020] Figure 2 This is a side view of a load switch according to an embodiment of the present invention, wherein the first moving contact is in the closed position;

[0021] Figure 3 This is a cross-sectional view of a load switch according to an embodiment of the present invention;

[0022] Figure 4 This is a side view of a load switch according to an embodiment of the present invention, wherein the first moving contact is between the closed position and the disconnected position;

[0023] Figure 5This is a side view of a load switch according to an embodiment of the present invention, wherein the first moving contact is in the isolated position;

[0024] Figure 6 This is a schematic diagram of the third shielding component according to an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the third shielding member according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the fourth shielding component according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures

[0028] 1-Load switch; 2-Bracket; 21-First support part; 22-Second support part; 23-Support; 3-Three-position switch; 31-First stationary contact; 32-First moving contact; 33-Isolation position; 34-Grounding stationary contact; 4-Vacuum interrupter; 41-Outer shell; 42-Second stationary contact; 43-Stationary conductive rod; 44-Second moving contact; 45-Moving conductive rod; 46-Connector; 5-Second shield; 6-Third shield; 7-Fourth shield; 71-Outer body part; 711-Outer surface; 72-Boss; 721-Peripheral wall; 722-Top wall; 73-Through hole; 74-Transition section; 75-Recess; 76-Slot structure; 8-First shield; 81-Base; 82-Extension; 83-Orifice; 9-Fifth shield Detailed Implementation

[0029] The illustrative embodiments of the technical solutions disclosed in this invention will now be described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of the invention, they are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of the invention. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar expressions appearing in the specification do not necessarily refer to all drawings or examples.

[0030] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0031] The terms “first,” “first,” “second,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are used to distinguish one component from others.

[0032] Figures 1 to 5 An example of the environmentally friendly load switch of the present invention is shown, which adopts a structure of a vacuum interrupter and a three-position switch connected in parallel, and optimizes the global electric field distribution through a multi-position coordinated electric field shielding mechanism, significantly improving the insulation reliability of the load switch. This load switch can be, for example, a 24kV voltage level load switch, and can be integrated into any type of switchgear, such as a ring main unit.

[0033] As shown in the figure, the load switch 1 includes a bracket 2 and a three-position switch 3 and a vacuum interrupter 4 mounted on the bracket 2. The bracket 2, as the load-bearing main body of the load switch 1, can be constructed as a rigid frame structure. A portion of the bracket 2 is shown in the figure, including a first support portion (or first support beam) 21 and a second support portion (or second support beam) 22 that are parallel to each other. A support 23 is fixedly mounted on the second support portion 22. The three-position switch 3 and the vacuum interrupter 4 are mounted on this rigid frame.

[0034] The three-position switch 3 includes a first stationary contact 31, a first moving contact 32, and a grounding stationary contact 34. The first moving contact 32 is pivotally mounted on a support 23. The first stationary contact 31 is fixedly mounted on a bracket 2 and suspended above the first moving contact 32, for connecting a busbar or branch busbar. The grounding stationary contact 34 is fixedly mounted on the first support portion 21 of the bracket 2 and maintains a safe isolation distance from the first stationary contact 31. The movement trajectory of the first moving contact 32 covers three positions: when engaged with the first stationary contact 31, the first moving contact 32 is in the closed position; when engaged with the grounding stationary contact 34, the first moving contact 32 is in the grounded position; and when located in the isolation position 33 between the grounding stationary contact 34 and the first stationary contact 31, the main contacts of the load switch 1 are completely separated. In order to keep the first moving contact 32 stably in the isolated position 33, a holding mechanism can be configured for the first moving contact 32, such as a pull-type holding mechanism or a linkage-type holding mechanism that is driven to the first moving contact 32.

[0035] The vacuum interrupter 4 and the three-position switch 3 are electrically connected in parallel. The ceramic shell or outer shell 41 of the vacuum interrupter 4 defines a sealed inner cavity, within which the vacuum interrupter contact system, including the second stationary contact 42 and the second moving contact 44, is located. The second moving contact 44 is connected to a moving conductive rod 45, which extends from the first end of the outer shell 41 and connects to the actuating mechanism. The second stationary contact 44 is connected to a stationary conductive rod 43, which extends from the second end of the outer shell 41. The stationary conductive rod 43 is electrically connected to the main busbar or branch busbar via a connector 46, thus connecting the vacuum interrupter 4 and the three-position switch 3 in parallel. The actuating mechanism can be, for example, a linkage mechanism or a cam mechanism. The second moving contact 43 can be mechanically linked with the first moving contact 32 via this actuating mechanism to achieve the opening and closing linkage between the vacuum interrupter and the three-position switch. For example, the rotation of the first moving contact 32 from the closed position to the isolated position 33 can drive the actuating mechanism to move, and then the actuating mechanism can drive the moving conductive rod 45 together with the second moving contact 43 to move away from the second stationary contact 42.

[0036] Combination Figures 2 to 5 The parallel switching process of load switch 1 can be clearly understood:

[0037] like Figure 2 and Figure 3 As shown, when the three-position switch 3 is closed, the first stationary contact 31 and the first moving contact 32 form the main circuit, and the current flows to the downstream branch through the main circuit. At this time, although the contact system of the vacuum interrupter 4 is closed, no current flows through it because it is not connected to a circuit.

[0038] refer to Figure 4 When the three-position switch 3 is ready to open, the operating mechanism drives the first moving contact 32 to rotate counterclockwise. During the rotation, the first moving contact 32 will first reach a position that engages with both the first stationary contact 31 and the operating mechanism of the vacuum interrupter 4. At this time, while the three-position switch 3 forms the main circuit, the vacuum interrupter 4 forms a parallel branch to allow current to pass through.

[0039] Subsequently, the operating mechanism continues to drive the first moving contact 32 to rotate counterclockwise, causing the first moving contact 32 to disengage from the first stationary contact 31 while remaining engaged with the operating mechanism of the vacuum interrupter 4. At this point, the main circuit is disconnected, while the parallel branch remains conductive. The current is instantly transferred to the parallel branch constructed by the vacuum interrupter 4, and no current flows through the three-position switch 3.

[0040] Subsequently, the first moving contact 32, driven by the operating mechanism, continues to rotate counterclockwise, triggering the operating mechanism of the vacuum interrupter 4. This causes the operating mechanism to drive the second moving contact 43 of the vacuum interrupter 4 to move away from the second stationary contact 42. At this time, the vacuum interrupter 4 completes the current interruption within the sealed outer shell 41 and efficiently extinguishes the arc using the vacuum medium.

[0041] like Figure 5 As shown, finally, the first moving contact 32 reaches the isolation position 33.

[0042] When closing is required, the operating mechanism drives the first moving contact 32 clockwise, causing it to rotate from the isolating position 33 to the closing position, and finally engage with the first stationary contact 31. The movement of the first moving contact 32 triggers the actuating mechanism of the vacuum interrupter 4, located between the isolating position 33 and the closing position (first stationary contact 31), causing the actuating mechanism to drive the second moving contact 43 of the vacuum interrupter 4 closer to the second stationary contact 42. After the first moving contact 32 engages with the first stationary contact 31, the second moving contact 44 of the vacuum interrupter 4 also engages with the second stationary contact 42, thus achieving closing.

[0043] The tripping action of load switch 1 can easily cause dynamic electric field distortion, leading to arc reignition or insulation breakdown. To prevent this problem, this invention equips load switch 1 with an electric field shielding scheme that combines a multi-position cooperative layout with geometrically optimized shielding components. The multi-field shielding mechanism of this invention will be described in detail below.

[0044] The first shielding element 8 is used for shielding the moving end of the vacuum interrupter 4. The first shielding element 8 is generally L-shaped and arranged near the vacuum interrupter 4 at the same potential as the moving conductive rod 45, for example, at the end of the housing 41 where the moving conductive rod 45 is located. The first shielding element 8 has an opening through which the moving conductive rod 45 of the vacuum interrupter 4 passes, providing electric field shielding during the breaking process to ensure insulation during breaking. In the illustrated embodiment, two first shielding elements 8 surround the first end of the housing 41 where the moving conductive rod 45 is located from opposite sides, and enclose the metal parts of the actuating mechanism, or even the entire actuating mechanism. Figure 8 As shown, each first shield 8 includes a base 81 and an extension 82 integrally extending from the base 81. The edge of the extension 82 may be a highly curved arc. The arc edges of the two first shields 8 face each other, jointly defining a cavity for accommodating the actuating mechanism. The bases 81 of the two first shields 8 form an opening 82 for the end of the housing 41 to be inserted, through which the moving conductive rod 45 of the vacuum interrupter 4 passes and extends into the cavity defined by the extensions 82 of the two second shields 8. The extensions of the first shields 8 may also extend toward the area between the second shield 5 at the first stationary contact 31 (described in detail later) and the third shield 6 at the isolation position 33, even to the point that the end of the extension of the first shield 8 is approximately centered between the second shield 5 and the third shield 6. When the first moving contact 32 moves between the closed position and the isolation position 33, it passes through the clearance between the extensions 82 of the two first shields 8 and drives the actuating mechanism.

[0045] The second shield 5 is disposed at the engagement end of the first stationary contact 31 for engaging the first moving contact 32, and the second shield 5 covers the engagement end of the first stationary contact 31. The outer surface of the second shield 5 facing away from the first stationary contact 31 has a turtle-back streamlined configuration, and a large-curvature arc surface configuration is constructed in the edge region. The adjacent surfaces of the first stationary contact 31 have a smooth transition to uniformly disperse electric field lines. In the illustrated embodiment, two independent second shields 5 are fixedly installed to the first stationary contact 31 from opposite sides, for example, by bolts or other connecting members. A gap is formed between the two second shields 5 to allow the movement trajectory of the first moving contact 32. In other embodiments, the second shield 5 may be a single piece that surrounds the engagement end of the first stationary contact 31 around its circumference, and the single second shield 5 has a relief groove formed corresponding to the movement trajectory of the first moving contact 32.

[0046] The second shield 5 can extend appropriately beyond the engagement end of the first stationary contact 31, so that when the first moving contact 32 is in the closed position, the second shield 5 can completely cover the entire area where the first moving contact 32 engages with the first stationary contact 31, thereby forming a closed equipotential shield, reducing the field strength at the contact edge during opening, and effectively eliminating the risk of arc reignition. The second shield 5, symmetrically arranged on both sides of the engagement area between the first moving contact 32 and the first stationary contact 31, can effectively eliminate electric field distortion and reduce the probability of arc reignition.

[0047] The third shield 6 is disposed at the isolation position 33. In the illustrated embodiment, the third shield 6 adopts a streamlined turtleback configuration similar to the first shield 5, wherein two independent third shields 6 are arranged opposite each other, with a gap between them to allow for the movement trajectory of the first moving contact 32. The opposing outer surface edges of the two third shields 6 also form a highly curved arcuate configuration, and there is a smooth transition between adjacent surfaces of each third shield 6. In other embodiments, the third shield 6 may be a single piece that completely surrounds the isolation position, and this single piece has a relief groove corresponding to the movement trajectory of the first moving contact 32. When the first moving contact 32 rotates into the isolation position 33, the two opposing third shields 6 can completely cover the end of the first moving contact 32, resulting in a uniform electric field distribution.

[0048] The fourth shielding element 7 is located at the stationary end of the vacuum interrupter 4. For example... Figure 6 and Figure 7As shown, the fourth shielding member 7 is constructed as a circumferentially closed (i.e., without gaps) integrally molded part. The outer surface 711 of its peripheral main body portion 71 has a streamlined curved surface, and a transverse joint portion extending integrally inward from the peripheral main body portion 71 forms a through hole 73 to fix the static conductive rod 43. When the fourth shielding member 7 is installed to the second end of the vacuum interrupter 4, the transverse joint portion abuts against the end face of the second end. In the illustrated embodiment, the transverse joint portion is constructed as a thin-walled internal boss 72, which includes a peripheral wall 721 integrally connected to the peripheral main body portion 72 via a transition section 74 and a top wall 722 covering the end of the peripheral wall 721 facing away from the transition section 74. The through hole 72 is formed approximately at the center of the top wall 722. A recess 75 is formed by the peripheral wall 721 and the top wall 722. The second end of the outer casing 41 can be inserted into the recess 75, with the top wall 722 abutting against the end face of the second end, thereby fitting the third shield 7 onto the outer casing 41. The outer main body portion 71 and the inner boss 72 are smoothly connected by a curved transition section 74, which protrudes in the opposite direction to the inner boss 72, thus forming a circumferentially continuous groove structure 76 between the outer main body portion 71 and the inner protrusion 72. The overall smooth and streamlined appearance of the fourth shield 7 helps prevent tip discharge, and the groove structure 76 helps guide the creepage distance, allowing the fourth shield 7 to more effectively eliminate high-voltage end angular electric field concentration. The stationary conductive rod 43 abuts against the top wall 722 of the inner boss 72 from one side of the recess 75, while the connector 46 abuts against the top wall 722 of the inner protrusion 72 from the opposite side and passes through the through hole 72 to connect to the stationary conductive rod 43. Figure 7 As shown in the cross-sectional view, the internal protrusion 72 does not protrude above or extend beyond the outer main body 71.

[0049] Although only an example with an internal boss 72 and a circumferential groove structure 76 continuously extending around the internal boss 72 is shown in the figure, those skilled in the art will understand that the fourth shield 7 can have other configurations. In an embodiment not shown, the fourth shield 7 has a peripheral body portion and a thin-walled lateral engagement portion integrally extending inward from the peripheral body portion. The structure of the peripheral body portion is similar to... Figure 6 and Figure 7 The outer body portion 71 of the illustrated embodiment has the same or similar structure, but the lateral joining portion differs from the boss 72 shown in the figure. In this embodiment (not shown), the transition section 74 is omitted, so that the lateral joining portion is directly and integrally connected to the outer body portion 71, and a substantially flat wall is constructed inside the outer body portion 71.

[0050] When the first moving contact 32 is close to the first stationary contact 31 of the three-position switch 3, the recovery voltage formed after the three-position switch 3 is opened will cause breakdown. To avoid this situation, a fifth shield 9 is provided on the first moving contact 32. The first moving contact 32 has a rod-shaped structure, with the end pivotally connected to the bracket 23 as the pivot end and the end engaging with the first stationary contact 31 / second stationary contact 42 as the engagement end. The section from the midpoint to the pivot end of the first moving contact 32 is defined as the lower section, and the section from the midpoint to the engagement end is defined as the upper section. In one embodiment, the fifth shield 9 is arranged at the midpoint or the upper section of the first moving contact 32. The fifth shield 9 can adopt a turtleback streamlined configuration similar to the first shield 5. As shown in the figure, two independent fifth shields 9 are arranged on opposite sides of the first moving contact 32. The opposing outer surface edges of the two fifth shielding elements 9 also form a large-curvature arcuate configuration, and there is a smooth transition between adjacent surfaces of each fifth shielding element 9. In other embodiments, the fifth shielding element 9 may be a single piece that completely surrounds the first moving contact 32. When the first moving contact 32 rotates between the closed position and the isolated position 33, the fifth shielding element 9 follows the first moving contact 32 and continuously surrounds the first moving contact 32, eliminating the electric field abrupt change formed during the movement of the first moving contact 32, and working together with the first shielding element 5 and the second shielding element 6 to form a dynamic complementary shielding chain.

[0051] The aforementioned shielding components can be made of conductive metal and manufactured using a one-piece molding process. Suitable conductive metals include, for example, aluminum alloys, preferably die-cast aluminum.

[0052] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0053] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A load switch for switchgear, characterized in that, include: Support (2); Three-position switch (3), including: The first stationary contact (31) and the grounding stationary contact (34) are fixed to the bracket (2); and A first moving contact (32) is rotatably disposed on the bracket (2), wherein the first moving contact (32) has a closed position engaged with the first stationary contact (31), a grounded position engaged with the grounded stationary contact (34), and an isolated position (33) between the first stationary contact (31) and the grounded stationary contact (34). A vacuum interrupter (4) is connected in parallel to the three-position switch (3) and includes: Outer shell (41): A second stationary contact (42) and a second moving contact (44) are provided inside the housing (41), wherein the second moving contact (44) is connected to a moving conductive rod (45) extending out of the housing (41). A first shield (8) is arranged near the housing (41) at the same potential as the moving conductive rod (45), and the first shield (8) has an opening through which the second moving contact (44) passes to provide electric field shielding during the switching process.

2. The load switch for switchgear according to claim 1, characterized in that, A second shield (5) is provided at the end of the first stationary contact (31) to be engaged with the first moving contact (32). The second shield (5) surrounds the first stationary contact (31) from at least two opposite sides and defines a gap to accommodate the first moving contact (32). When the first moving contact (32) is in the closed position, the second shield (5) completely covers the end of the first moving contact (32) that is engaged with the first stationary contact (31).

3. The load switch for switchgear according to claim 1, characterized in that, The load switch includes an actuation mechanism connected to the moving conductive rod (45), the actuation mechanism being configured to drive the second moving contact (44) away from the second stationary contact (42) in response to movement of the first moving contact (32) from the closed position to the closed position (33), and to drive the second moving contact (44) closer to the second stationary contact (42) in response to movement of the first moving contact (32) from the closed position (33) to the closed position, wherein the first shield (8) has a base (81) surrounding the housing (41) and an extension (82) integrally extending from the base (81), the base (81) defining an opening (83) for receiving the moving conductive rod (45), and the extension (82) at least covering the metal part of the actuation mechanism.

4. The load switch for switchgear according to claim 1, characterized in that, The load switch includes a holding mechanism for holding the first moving contact (32) in the isolation position (33), and includes a third shield (6) disposed at the isolation position (33), wherein when the first moving contact (32) moves to the isolation position (33), the third shield (6) surrounds the first moving contact (32) from at least opposite sides.

5. The load switch for switchgear according to claim 1, characterized in that, The static conductive rod (43) connected to the second static contact (42) extends out of the housing (41). The load switch includes a fourth shield (7) located at the end of the housing (41). The fourth shield (7) is a circumferentially closed integral molded part and has a through hole (73) for fixing the static conductive rod (43).

6. The load switch for switchgear according to claim 5, characterized in that, The fourth shielding member (7) has a circumferentially continuous and closed peripheral main body portion (71) and a transverse joint portion integrally extending inward from the peripheral main body portion (71). The outer surface (711) of the peripheral main body portion (71) is curved. The through hole (73) is formed in the transverse joint portion, and the end face of the second end of the outer shell (41) abuts against the transverse joint portion.

7. The load switch for switchgear according to claim 6, characterized in that, The transverse joint portion is integrally connected to the outer body portion (71) by a smooth transition section (74), the transition section (74) forming a groove structure (76) extending around the transverse joint portion, thereby the transverse joint portion being configured as a boss (72) protruding inside the outer body portion (71), the second end of the outer shell (41) being inserted into a recess (75) surrounded by the boss (72).

8. The load switch for switchgear according to claim 1, characterized in that, The first moving contact (32) is provided with a fifth shield (9), which surrounds the first moving contact (32) from at least two opposite sides.

9. The load switch for switchgear according to claim 8, characterized in that, The first moving contact (32) includes a lower section extending from the midpoint toward the support (2) and an upper section extending from the midpoint away from the support (2), wherein the fifth shield (9) is disposed on the upper section of the first moving contact (32).

10. A switch cabinet, characterized in that, The load switch includes any one of claims 1 to 9.

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