Contact assembly and low-voltage switch

Abstract

The invention relates to the technical field of low-voltage electric appliances, and particularly discloses a contact assembly and a low-voltage switch, and the contact assembly comprises a moving contact structure and a static contact structure which is matched with the moving contact structure. The moving contact structure comprises a rotating member, a mechanism linkage shaft and a moving contact body arranged on the rotating member. An arc-shaped groove is formed in the rotating piece, and the center of the arc-shaped groove coincides with the rotating axis of the rotating piece; the mechanism linkage shaft abuts against one end of the arc-shaped groove and pokes the rotating piece to rotate around the rotating axis. When the moving contact body and the static contact structure are switched off, the mechanism linkage shaft abuts against the other end of the arc-shaped groove, and the rotating piece rotates around the rotating axis under the action of inertia force. According to the low-voltage switch, under the condition that the size of the low-voltage switch shell is not increased, the maximum opening distance between the moving contact structure and the static contact structure can be increased through inertia force, and therefore the arc extinguishing performance of the low-voltage switch is improved.

Description

Technical Field

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

[0002] Conventional low-voltage switches generally use an arc extinguishing chamber structure composed of multiple grids arranged in parallel or radially to extinguish the arc. At present, it is common to increase the arc breaking voltage by adding grids to improve the arc extinguishing ability of low-voltage switches so that low-voltage switches can meet higher voltage arc extinguishing requirements. However, due to the small size of low-voltage switches and the limited internal space of the switch housing, increasing the number of grids or increasing the extension length of the moving contact structure to improve the arc breaking capacity will be limited by the size of the low-voltage switch.

[0003] In the prior art, the moving contact of the contact assembly is usually driven by a rotating part, and the rotation angle of the driving shaft is equal to the rotation angle of the moving contact, so that the opening distance between the moving contact and the static contact is limited, and the opening distance between the moving contact and the static contact cannot be further lengthened, resulting in the arc extinguishing ability of the low-voltage switch cannot be further improved. Summary of the invention

[0004] The purpose of the present application is to provide a contact assembly and a low-voltage switch, which can increase the maximum spacing between the moving contact structure and the static contact structure through inertial force without increasing the volume of the low-voltage switch housing, thereby improving the arc extinguishing performance of the low-voltage switch.

[0005] The embodiment of the present application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application provides a contact assembly, including a moving contact structure and a stationary contact structure arranged in cooperation with the moving contact structure; the moving contact structure includes a rotating member, a mechanism linkage shaft and a moving contact body arranged on the rotating member; an arc groove is arranged on the rotating member, and the center of the arc groove coincides with the rotation axis of the rotating member; the mechanism linkage shaft abuts against one end of the arc groove and drives the rotating member to rotate around the rotation axis; the moving contact body and the stationary contact structure are disconnected, the mechanism linkage shaft abuts against the other end of the arc groove, and the rotating member rotates around the rotation axis under the action of inertia force.

[0007] As an optional implementation, the extension direction of the mechanism linkage axis is perpendicular to the rotation plane of the rotating member.

[0008] As an optional implementation, the maximum rotation angle of the moving contact body and the stationary contact structure for closing is 90°; and / or the maximum rotation angle of the moving contact body and the stationary contact structure for opening is 150°.

[0009] As an optional implementation, there are at least two arc-shaped grooves, and at least two arc-shaped grooves are spaced apart and distributed around the rotation axis.

[0010] In the second aspect, an embodiment of the present application provides a low-voltage switch, comprising a shell, the above-mentioned contact assembly and a hybrid arc extinguishing chamber; the hybrid arc extinguishing chamber comprises a grid arc extinguishing assembly and a magnetic arc extinguishing assembly arranged along the movement path of the moving contact body of the contact assembly, which is used to extinguish the arc generated by the contact assembly in the shell.

[0011] As an optional implementation, there are two moving contact bodies symmetrically arranged on the rotating member; and there are two hybrid arc extinguishing chambers arranged on both sides of the rotating member, and corresponding one-to-one to the two moving contact bodies.

[0012] As an optional embodiment, the hybrid arc extinguishing chamber is projected as an L-shaped structure on the rotation plane of the rotating part; a rectangular chamber is provided in the shell, the rotating part is arranged in the middle of the rectangular chamber, and the two L-shaped structures are respectively arranged at two non-adjacent corners of the rectangular chamber.

[0013] As an optional implementation, the moving contact body is opened by passing through the grid arc extinguishing assembly and the magnetic arc extinguishing assembly in sequence; or, the moving contact body is opened by passing through the magnetic arc extinguishing assembly and the grid arc extinguishing assembly in sequence.

[0014] As an optional implementation, the shell is provided with exhaust passages on both sides of the hybrid arc extinguishing chamber, and the exhaust passages extend on the rotation plane of the rotating member and communicate with the external environment of the shell.

[0015] As an optional embodiment, the exhaust channel is parallel to the length direction of the shell, and the air outlet of the exhaust channel is arranged on both sides of the length direction of the shell; at least one of the exhaust channels is far away from the static contact structure, and at least one of the exhaust channels is close to the static contact structure.

[0016] The beneficial effects of the embodiments of the present application include:

[0017] The embodiment of the present application provides a contact assembly, including a moving contact structure and a stationary contact structure arranged in cooperation with the moving contact structure; the moving contact structure includes a rotating member, a mechanism linkage shaft and a moving contact body arranged on the rotating member; the embodiment of the present application is provided with an arc groove on the rotating member, and the center of the arc groove coincides with the rotation axis of the rotating member; the mechanism linkage shaft of the embodiment of the present application abuts against one end of the arc groove, and drives the rotating member to rotate around the rotation axis; when the moving contact body and the stationary contact structure are opened, they rotate around the rotation axis under the action of inertia force, so that the mechanism linkage shaft abuts against the other end of the arc groove. Compared with the prior art, the opening process of the contact assembly of the embodiment of the present application has two parts of movement to form a larger dynamic opening distance. In the first part of the movement of the moving contact body away from the stationary contact structure, the rotation angle of the moving contact body is consistent with the rotation angle of the mechanism linkage shaft. In the second part of the movement of the moving contact body away from the stationary contact structure, the idle stroke formed by the arc-shaped groove allows the moving contact body to continue to move away from the stationary contact structure under the action of inertia force, thereby increasing the maximum spacing between the moving contact structure and the stationary contact structure and improving the arc breaking capacity.

[0018] The embodiment of the present application provides a low-voltage switch, including a housing, the above-mentioned contact assembly and a hybrid arc extinguishing chamber; the hybrid arc extinguishing chamber includes a grid arc extinguishing assembly and a magnetic arc extinguishing assembly arranged along the moving contact body movement path of the contact assembly, which is used to extinguish the arc generated by the contact assembly in the housing. The low-voltage switch provided by the embodiment of the present application includes the above-mentioned contact assembly, and combined with the hybrid arc extinguishing chamber structure, the arc extinguishing ability of the low-voltage switch can be greatly improved, and the low-voltage switch can meet higher voltage arc extinguishing requirements without increasing the volume of the low-voltage switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the static contact structure close to the grid arc extinguishing assembly in the embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of the static contact structure close to the magnetic arc extinguishing assembly in the embodiment of the present application.

[0022] Figure 3 This is one of the structural schematic diagrams of the contact assembly of the embodiment of the present application;

[0023] Figure 4 This is the second structural schematic diagram of the contact assembly of the embodiment of the present application;

[0024] Figure 5 This is the third structural diagram of the contact assembly of the embodiment of the present application;

[0025] Figure 6 This is one of the structural schematic diagrams of the low-voltage switch in the embodiment of the present application;

[0026] Figure 7 This is the second structural diagram of the low-voltage switch in the embodiment of the present application;

[0027] Figure 8 This is the third structural schematic diagram of the low-voltage switch according to the embodiment of the present application.

[0028] Icons: 100-contact assembly; 101-moving contact structure; 102-static contact structure; 103-rotating part; 104-mechanism linkage shaft; 105-moving contact body; 106-arc groove; 107-rotation axis; 108-low-voltage switch; 109-housing; 110-hybrid arc extinguishing chamber; 111-grid arc extinguishing assembly; 112-magnetic arc extinguishing assembly; 113-L-type structure; 114-exhaust channel; 115-length direction; 116-air outlet. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] 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 which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] Conventional low-voltage switches generally use an arc extinguishing chamber structure composed of multiple grids arranged in parallel or radially to extinguish the arc. At present, it is common to increase the arc breaking voltage by adding grids to improve the arc extinguishing ability of low-voltage switches so that low-voltage switches can meet higher voltage arc extinguishing requirements. However, due to the small size of low-voltage switches and the limited internal space of the switch housing, increasing the number of grids or increasing the extension length of the moving contact structure to improve the arc breaking capacity will be limited by the size of the low-voltage switch.

[0034] In the prior art, the moving contact of the contact assembly is usually driven by a rotating part, and the rotation angle of the driving shaft is equal to the rotation angle of the moving contact, so that the opening distance between the moving contact and the static contact is limited, and the opening distance between the moving contact and the static contact cannot be further lengthened, resulting in the arc extinguishing ability of the low-voltage switch cannot be further improved.

[0035] In order to solve the above technical problems, an embodiment of the present application provides a contact assembly 100 and a low-voltage switch 108 .

[0036] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, an embodiment of the present application provides a contact assembly 100, including a moving contact structure 101 and a stationary contact structure 102 arranged in cooperation with the moving contact structure 101; the moving contact structure 101 includes a rotating member 103, a mechanism linkage shaft 104 and a moving contact body 105 arranged on the rotating member 103; an arc groove 106 is arranged on the rotating member 103, and the center of the arc groove 106 coincides with the rotation axis 107 of the rotating member 103; the mechanism linkage shaft 104 abuts against one end of the arc groove 106, and drives the rotating member 103 to rotate around the rotation axis 107; the moving contact body 105 and the stationary contact structure 102 are disconnected, and the rotating member 103 rotates around the rotation axis 107 under the action of inertia force, so that the mechanism linkage shaft 104 abuts against the other end of the arc groove 106.

[0037] It should be noted that the movable contact body 105 of the embodiment of the present application is fixedly mounted on the rotating member 103, and extends in the radial direction of the rotating member 103 away from the rotation axis 107. The mechanism linkage shaft 104 abuts against one end of the arc groove 106, and drives the rotating member 103 to rotate, so that the arc groove 106 can form an idle stroke in the direction opposite to the rotation direction. When the rotating member 103 needs to rotate in the opposite direction, the mechanism linkage shaft 104 first rotates to abut against the other end of the arc groove 106, and then the mechanism linkage shaft 104 drives the rotating member 103 to rotate to a preset rotation angle. Due to the setting of the idle stroke of the arc groove 106, the rotating member 103 and the movable contact body 105 can continue to rotate under the action of inertia, thereby increasing the opening distance of the switch without affecting the volume of the low-voltage electrical appliance and improving the arc breaking capacity.

[0038] The specific structure of the stationary contact structure 102 can be selected by those skilled in the art according to their needs.

[0039] The embodiment of the present application provides a contact assembly 100, including a moving contact structure 101 and a stationary contact structure 102 arranged in cooperation with the moving contact structure 101; the moving contact structure 101 includes a rotating member 103, a mechanism linkage shaft 104 and a moving contact body 105 arranged on the rotating member 103; the embodiment of the present application is provided with an arc groove 106 on the rotating member 103, and the center of the arc groove 106 coincides with the rotation axis 107 of the rotating member 103; the mechanism linkage shaft 104 of the embodiment of the present application and the arc groove 106 are arranged on the rotating member 103. One end of the slot 106 abuts against and drives the rotating member 103 to rotate around the rotation axis 107; when the moving contact body 105 and the stationary contact structure 102 are opened, the mechanism linkage shaft 104 first moves to abut against the other end of the arc slot 106, and then the mechanism linkage shaft 104 drives the rotating member 103 to rotate to a preset rotation angle. Since the arc slot 106 forms an idle stroke in the direction opposite to the rotation direction, the moving contact body 105 continues to rotate around the rotation axis 107 under the action of inertia force, thereby increasing the opening distance of the opening. Compared with the prior art, the opening process of the contact assembly 100 of the embodiment of the present application has two parts of movement to form a larger dynamic opening distance. In the first part of the movement of the moving contact body 105 away from the stationary contact structure 102, the rotation angle of the moving contact body 105 is consistent with the rotation angle of the mechanism linkage shaft 104. In the second part of the movement of the moving contact body 105 away from the stationary contact structure 102, the idle stroke formed by the arc groove 106 allows the moving contact body 105 to continue to move away from the stationary contact structure 102 under the action of inertia force, thereby increasing the maximum distance between the moving contact structure 101 and the stationary contact structure 102 and improving the arc breaking capacity.

[0040] Reference Figure 3 , Figure 4 as well as Figure 5As shown in FIG. 1 , as an optional embodiment, the extension direction of the mechanism linkage shaft 104 is perpendicular to the rotation plane of the rotating member 103. Figure 4 As shown, the mechanism linkage shaft 104 is located at one end of the arc groove 106. Figure 5 As shown, the mechanism linkage shaft 104 is located at the other end of the arc-shaped slot 106 .

[0041] Furthermore, the embodiment of the present application discloses a specific arrangement of the mechanism linkage shaft 104. The embodiment of the present application arranges the extension direction of the mechanism linkage shaft 104 perpendicular to the rotation plane of the rotating member 103, so that the mechanism linkage shaft 104 can reliably and stably drive the rotating member 103 to rotate. The rotation of the rotating member 103 is driven by the rotation of the mechanism linkage shaft 104, which is convenient for operation.

[0042] Exemplarily, the maximum rotation angle of the moving contact body 105 and the stationary contact structure 102 for closing is 90°. Exemplarily, the maximum rotation angle of the moving contact body 105 and the stationary contact structure 102 for opening is 150°. Preferably, the maximum rotation angle of the moving contact body 105 and the stationary contact structure 102 for closing is 80°. The maximum rotation angle of the moving contact body 105 and the stationary contact structure 102 for opening is 120°.

[0043] As an optional implementation, there are at least two arcuate grooves 106 , and the at least two arcuate grooves 106 are spaced apart and distributed around the rotation axis 107 .

[0044] In the embodiment of the present application, by increasing the number of arc grooves 106, multiple mechanism linkage shafts 104 can be inserted into the arc grooves 106, so that the mechanism linkage shafts 104 can reliably drive the rotating member 103 to rotate, and provide sufficient driving force for the rotating member 103, so that the moving contact body 105 can obtain a larger inertia force. It should be noted that the number of arc grooves 106 can be set by technicians in this field as needed. Exemplarily, there are two arc grooves 106 and they are evenly spaced around the rotation axis 107. Exemplarily, there are three arc grooves 106 and they are evenly spaced around the rotation axis 107.

[0045] Reference Figure 6 as well as Figure 8 As shown, an embodiment of the present application provides a low-voltage switch 108, including a shell 109, the above-mentioned contact assembly 100 and a hybrid arc extinguishing chamber 110; the hybrid arc extinguishing chamber 110 includes a grid arc extinguishing assembly 111 and a magnetic arc extinguishing assembly 112 arranged along the movement path of the moving contact body 105 of the contact assembly 100, which is used to extinguish the arc generated by the contact assembly 100 in the shell 109.

[0046] The embodiment of the present application provides a low-voltage switch 108, including a housing 109, the above-mentioned contact assembly 100, and a hybrid arc extinguishing chamber 110; the hybrid arc extinguishing chamber 110 includes a grid arc extinguishing assembly 111 and a magnetic arc extinguishing assembly 112 arranged along the moving path of the moving contact body 105 of the contact assembly 100, and is used to extinguish the arc generated by the contact assembly 100 in the housing 109. The low-voltage switch 108 provided in the embodiment of the present application includes the above-mentioned contact assembly 100, and the structure of the hybrid arc extinguishing chamber 110 can greatly improve the arc extinguishing ability of the low-voltage switch 108, so that the low-voltage switch 108 can meet higher voltage arc extinguishing requirements without increasing the volume of the low-voltage switch 108.

[0047] Reference Figure 6 As shown, as an optional implementation, there are two moving contact bodies 105 symmetrically arranged on the rotating member 103 ; there are two hybrid arc extinguishing chambers 110 arranged on both sides of the rotating member 103 and corresponding to the two moving contact bodies 105 one by one.

[0048] The embodiment of the present application discloses that two moving contact bodies 105 are symmetrically arranged on a rotating member 103, and two hybrid arc extinguishing chambers 110 are correspondingly arranged to form a low-voltage switch 108 with double breakpoints.

[0049] Reference Figure 6 As shown, as an optional embodiment, the hybrid arc extinguishing chamber 110 is projected as an L-shaped structure 113 on the rotation plane of the rotating member 103; a rectangular chamber is provided in the shell 109, the rotating member 103 is arranged in the middle of the rectangular chamber, and two L-shaped structures 113 are respectively arranged at two non-adjacent corners of the rectangular chamber.

[0050] Furthermore, the embodiment of the present application specifically discloses a specific layout of a double-breakpoint low-voltage switch 108. The double-breakpoint low-voltage switch 108 provided in the embodiment of the present application has a compact structure, so that the internal space of the housing 109 can be fully utilized, which is convenient for reducing the volume of the entire low-voltage switch 108. In addition, the double-breakpoint low-voltage switch 108 provided in the embodiment of the present application adopts the above-mentioned contact assembly 100, and the above-mentioned contact assembly 100 can generate a larger opening distance between the moving contact body 105 and the static contact structure 102, thereby improving the arc extinguishing ability of the double-breakpoint low-voltage switch 108. Further, the double-breakpoint low-voltage switch 108 in the embodiment of the present application adopts a hybrid arc extinguishing chamber 110, and the hybrid arc extinguishing chamber 110 includes a grid arc extinguishing assembly 111 and a magnetic arc extinguishing assembly 112 arranged along the moving path of the moving contact body 105 of the contact assembly 100, so that the arc breaking ability of the double-breakpoint low-voltage switch 108 can be further enhanced. That is to say, the double-breakpoint low-voltage switch 108 provided in the embodiment of the present application can significantly improve the arc breaking capacity of the switch without increasing the volume of the entire switch.

[0051] Among them, refer to Figure 1 and Figure 2 As shown, the moving contact body 105 is opened and passes through the grid arc extinguishing assembly 111 and the magnetic arc extinguishing assembly 112 in sequence. Or, the moving contact body 105 is opened and passes through the magnetic arc extinguishing assembly 112 and the grid arc extinguishing assembly 111 in sequence.

[0052] Reference Figure 6 and Figure 7 As shown, as an optional implementation, the housing 109 is provided with exhaust passages 114 on both sides of the hybrid arc extinguishing chamber 110 , and the exhaust passages 114 extend on the rotation plane of the rotating member 103 and communicate with the external environment of the housing 109 .

[0053] Specifically, the exhaust channel 114 is parallel to the length direction 115 of the housing 109, and the gas outlets 116 of the exhaust channel 114 are arranged on both sides of the length direction 115 of the housing 109. It should be noted that in the embodiment of the present application, exhaust channels 114 are arranged on both sides of the two hybrid arc extinguishing chambers 110, and the high-temperature gas generated in the low-pressure switch 108 is discharged through the exhaust channels 114, and one exhaust channel 114 is far away from the static contact structure 102, and the other exhaust channel 114 is close to the static contact structure 102.

[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A contact assembly (100), characterized in that: The invention comprises a moving contact structure (101) and a stationary contact structure (102) arranged in cooperation with the moving contact structure (101); the moving contact structure (101) comprises a rotating member (103), a mechanism linkage shaft (104) and a moving contact body (105) arranged on the rotating member (103); an arc groove (106) is arranged on the rotating member (103), and the center of the arc groove (106) is aligned with the rotation axis of the rotating member (103). The axis (107) coincides; the mechanism linkage shaft (104) abuts against one end of the arc-shaped slot (106), and drives the rotating member (103) to rotate around the rotation axis (107); the moving contact body (105) and the static contact structure (102) are disconnected, the mechanism linkage shaft (104) abuts against the other end of the arc-shaped slot (106), and the rotating member (103) rotates around the rotation axis (107) under the action of inertia force.

2. The contact assembly (100) according to claim 1, characterized in that: The extension direction of the mechanism linkage shaft (104) is perpendicular to the rotation plane of the rotating member (103).

3. The contact assembly (100) according to claim 1, characterized in that: The maximum rotation angle of the moving contact body (105) and the stationary contact structure (102) when closing the switch is 90°; and / or the maximum rotation angle of the moving contact body (105) and the stationary contact structure (102) when opening the switch is 150°.

4. The contact assembly (100) according to any one of claims 1 to 3, characterized in that: There are at least two arc-shaped grooves (106), and at least two arc-shaped grooves (106) are spaced apart and distributed around the rotation axis (107).

5. A low voltage switch (108), characterized in that: It comprises a shell (109), a contact assembly (100) as claimed in any one of claims 1 to 4, and a hybrid arc extinguishing chamber (110); the hybrid arc extinguishing chamber (110) comprises a grid arc extinguishing assembly (111) and a magnetic arc extinguishing assembly (112) arranged along the movement path of a moving contact body (105) of the contact assembly (100), and is used for extinguishing the arc generated by the contact assembly (100) in the shell (109).

6. The low-voltage switch (108) according to claim 5, characterized in that: There are two moving contact bodies (105) symmetrically arranged on the rotating member (103); and two hybrid arc extinguishing chambers (110) are arranged on both sides of the rotating member (103) and correspond one to one to the two moving contact bodies (105).

7. The low-voltage switch (108) according to claim 6, characterized in that: The hybrid arc extinguishing chamber (110) is projected onto the rotation plane of the rotating member (103) into an L-shaped structure (113); a rectangular chamber is provided in the housing (109), the rotating member (103) is arranged in the middle of the rectangular chamber, and two L-shaped structures (113) are respectively arranged at two non-adjacent corners of the rectangular chamber.

8. The low-voltage switch (108) according to claim 5 or 6, characterized in that: The moving contact body (105) is opened and passes through the grid arc extinguishing assembly (111) and the magnetic arc extinguishing assembly (112) in sequence; or, the moving contact body (105) is opened and passes through the magnetic arc extinguishing assembly (112) and the grid arc extinguishing assembly (111) in sequence.

9. The low-voltage switch (108) according to any one of claims 5 to 7, characterized in that: The housing (109) is provided with exhaust passages (114) on both sides of the hybrid arc extinguishing chamber (110); the exhaust passages (114) extend on the rotation plane of the rotating member (103) and are in communication with the external environment of the housing (109).

10. The low-voltage switch (108) according to claim 9, characterized in that: The exhaust channel (114) is parallel to the length direction (115) of the shell (109), and the air outlet (116) of the exhaust channel (114) is arranged on both sides of the length direction (115) of the shell (109); at least one of the exhaust channels (114) is far away from the stationary contact structure (102), and at least one of the exhaust channels (114) is close to the stationary contact structure (102).

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