Contact system and change-over switch

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses a contact system and a change-over switch, and the contact system comprises a moving contact assembly, a first static contact, a second static contact and a third static contact. The moving contact assembly is driven to rotate to a first closing position through a first arc path and is connected with the first static contact and the third static contact; the moving contact assembly is driven to rotate to a second closing position through a second arc path and is connected with the second static contact and the third static contact; the first arc path and the second arc path are located on the two sides of the moving contact assembly, and at least one magnetic arc extinguishing piece is arranged on each of the first arc path and the second arc path. By improving the contact system, the arc extinguishing function can be enhanced, and the service lives of the contact system and the change-over switch are effectively prolonged.

Description

Technical Field

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

[0002] The contact system of the prior art usually reciprocates on an arc path when implementing a switching operation. Since the generation of the electric arc causes erosion to the internal structure of the switching switch, the service life of the structural components near the single arc path will be greatly reduced during long-term use, ultimately limiting the service life of the switching switch. Utility Model Content

[0003] The purpose of the present application is to provide a contact system and a transfer switch, which can enhance the arc extinguishing function and effectively increase the service life of the contact system and the transfer switch by improving the contact system.

[0004] The embodiment of the present application is implemented as follows:

[0005] In the first aspect, an embodiment of the present application provides a contact system, including a moving contact assembly, a first stationary contact, a second stationary contact and a third stationary contact; the moving contact assembly is driven to rotate through a first arc path to a first closing position to connect the first stationary contact and the third stationary contact; the moving contact assembly is driven to rotate through a second arc path to a second closing position to connect the second stationary contact and the third stationary contact; the first arc path and the second arc path are located on both sides of the moving contact assembly, and at least one magnetic arc extinguishing member is arranged on the first arc path and the second arc path.

[0006] As an optional implementation, the magnetic pole direction of the magnetic arc extinguishing member is perpendicular to the rotation plane of the moving contact assembly.

[0007] As an optional implementation, the magnetic pole direction of the magnetic arc extinguishing member is parallel to the rotation plane of the moving contact assembly.

[0008] As an optional embodiment, the moving contact assembly includes a rotating bracket and a moving contact rod, the rotating bracket is driven to drive the moving contact rod to rotate forward, the first end of the moving contact rod abuts against the first static contact, and the second end of the moving contact rod abuts against the third static contact; the rotating bracket is driven to drive the moving contact rod to rotate reversely, the first end of the moving contact rod abuts against the third static contact, and the second end of the moving contact rod abuts against the second static contact.

[0009] In a second aspect, an embodiment of the present application provides a switching switch, comprising a switch housing and the above-mentioned contact system, wherein the contact system is installed in the switch housing; wherein the magnetic arc extinguishing member is installed on the moving contact assembly; and / or the magnetic arc extinguishing member is installed on the switch housing.

[0010] As an optional implementation, the switch housing has a cavity for installing the contact system; the switch housing is provided with at least one exhaust channel, one end of the exhaust channel is connected to the cavity, and the other end is connected to the external environment of the switch housing.

[0011] As an optional embodiment, there are four exhaust channels; wherein, the air inlet port of the first exhaust channel is close to the closing contact portion of the first static contact; the air inlet port of the second exhaust channel is close to the closing contact portion of the second static contact; the air inlet ports of the other two exhaust channels are arranged on both sides of the third static contact; the four air inlet ports are all arranged on the rotation path of the moving contact assembly.

[0012] As an optional implementation, the inner wall of the exhaust passage has a guide structure that allows the airflow to flow along an arc path.

[0013] As an optional implementation, it further includes arc-extinguishing grids, and the arc-extinguishing grids are arranged at intervals along the first arc path and the second arc path.

[0014] As an optional embodiment, the inner wall of the switch housing is provided with a protrusion structure arranged at intervals along the rotation path of the moving contact assembly; the protrusion structure includes a first rib and a second rib; the first rib intersects perpendicularly with the rotation plane of the moving contact assembly; the extension direction of the second rib is parallel to the rotation plane of the moving contact assembly.

[0015] As an optional implementation, a third rib is provided on the side surface of the moving contact assembly; and an extension direction of the third rib is perpendicular to and intersects with the rotation plane of the moving contact assembly.

[0016] In a preferred embodiment of the present application, the above-mentioned conversion switch includes a switch housing and a contact system, and the contact system is installed in the switch housing; the contact system includes a moving contact assembly, a first static contact, a second static contact and a third static contact; the moving contact assembly is driven to rotate through a first arc path to a first closing position to connect the first static contact and the third static contact; the moving contact assembly is driven to rotate through a second arc path to a second closing position to connect the second static contact and the third static contact; the first arc path and the second arc path are located on both sides of the moving contact assembly, and at least one magnetic arc extinguishing member is arranged on the first arc path and the second arc path.

[0017] Wherein, the magnetic pole direction of the magnetic arc extinguishing member is perpendicular or parallel to the rotation plane of the moving contact assembly.

[0018] Wherein, the magnetic arc extinguishing member is installed on the moving contact assembly; and / or, the magnetic arc extinguishing member is installed on the switch housing.

[0019] The beneficial effects of the embodiments of the present application include:

[0020] The embodiment of the present application provides a contact system, including a moving contact assembly, a first static contact, a second static contact and a third static contact; the moving contact assembly of the embodiment of the present application is driven to rotate through a first arc path to a first closing position to connect the first static contact and the third static contact; the moving contact assembly of the embodiment of the present application is driven to rotate through a second arc path to a second closing position to connect the second static contact and the third static contact; the first arc path and the second arc path of the embodiment of the present application are located on both sides of the moving contact assembly, and at least one magnetic arc extinguishing member is arranged on the first arc path and the second arc path. Compared with the prior art, the embodiment of the present application arranges the first arc path and the second arc path on both sides of the moving contact assembly, so that the magnetic arc extinguishing member can be arranged on both the first arc path and the second arc path, thereby greatly increasing the arrangement space of the magnetic arc extinguishing member, thereby effectively enhancing the magnetic arc extinguishing effect. In addition, the embodiment of the present application can prevent the arc from repeatedly burning on one path during circuit conversion through the setting of the first arc path and the second arc path. The use of two arc paths effectively increases the durability of the entire structural component, thereby greatly improving the service life of the conversion switch.

[0021] A switching switch provided in an embodiment of the present application includes a switch housing and the above-mentioned contact system, wherein the contact system is installed in the switch housing; wherein the magnetic arc extinguishing member is installed on the moving contact assembly; and / or the magnetic arc extinguishing member is installed on the switch housing. The switching switch of the embodiment of the present application can install the magnetic arc extinguishing member on the switch housing, and can also install the magnetic arc extinguishing member on the moving contact assembly of the contact system. The magnetic arc extinguishing member on the switch housing is fixedly arranged, and the magnetic arc extinguishing member on the moving contact assembly can rotate with the moving contact assembly to realize dynamic traction and pulling of the electric arc. Compared with the prior art, the embodiment of the present application can effectively improve the service life of the contact system and the switching switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is one of the structural schematic diagrams of the conversion switch of the embodiment of the present application;

[0024] Figure 2 This is the second structural diagram of the transfer switch according to the embodiment of the present application;

[0025] Figure 3 This is the third structural diagram of the transfer switch of the embodiment of the present application;

[0026] Figure 4 This is the fourth structural schematic diagram of the conversion switch according to the embodiment of the present application.

[0027] icon:

[0028] 100-moving contact assembly; 101-first static contact; 102-second static contact; 103-third static contact; 104-first closing position; 105-second closing position; 106-magnetic arc extinguishing member; 107-rotating bracket; 108-moving contact rod; 109-first end; 110-second end; 111-conversion switch; 112-switch housing; 113-cavity; 114-exhaust channel; 115-inlet port; 116-flow guide structure; 117-first rib; 118-second rib; 119-third rib. 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] The contact system of the prior art switching switch 111 usually reciprocates on an arc path when implementing a switching operation. Since the generation of the electric arc causes erosion to the internal structure of the switching switch 111, the service life of the structural components near the single arc path will be greatly reduced during long-term use, ultimately limiting the service life of the switching switch 111.

[0034] In order to solve the above technical problems, an embodiment of the present application provides a contact system and a conversion switch 111.

[0035] Reference Figure 1 As shown, an embodiment of the present application provides a contact system, including a moving contact assembly 100, a first stationary contact 101, a second stationary contact 102 and a third stationary contact 103; the moving contact assembly 100 is driven to rotate through a first arc path to a first closing position 104 to connect the first stationary contact 101 and the third stationary contact 103; the moving contact assembly 100 is driven to rotate through a second arc path to a second closing position 105 to connect the second stationary contact 102 and the third stationary contact 103; the first arc path and the second arc path are located on both sides of the moving contact assembly 100, and at least one magnetic arc extinguishing member 106 is arranged on the first arc path and the second arc path.

[0036] Among them, the moving contact assembly 100 of the embodiment of the present application includes a rotating bracket 107 and a moving contact rod 108. The rotating bracket 107 is driven to drive the moving contact rod 108 to rotate forward, and the first end 109 of the moving contact rod 108 abuts against the first static contact 101, and the second end 110 of the moving contact rod 108 abuts against the third static contact 103; the rotating bracket 107 is driven to drive the moving contact rod 108 to rotate reversely, and the first end 109 of the moving contact rod 108 abuts against the third static contact 103, and the second end 110 of the moving contact rod 108 abuts against the second static contact 102.

[0037] It should be noted that the first end 109 of the moving contact rod 108 of the embodiment of the present application rotates forward to form a first arc path, and the second end 110 of the moving contact rod 108 rotates backward to form a second arc path.

[0038] It should be noted that the third static contact 103 may also be electrically connected to the moving contact rod 108 by means of a flexible connection.

[0039] When the moving contact rod 108 rotates forward, the first end 109 abuts against the first static contact 101, and the first static contact 101 and the third static contact 103 are connected through the soft connection to achieve closing. The second end 110 rotates synchronously to achieve opening of the second static contact 102 and the third static contact 103.

[0040] When the moving contact rod 108 rotates in the opposite direction, the second end 110 contacts the second static contact 102, and the second static contact 102 and the third static contact 103 are connected through the soft connection to achieve closing. The first end 109 rotates synchronously to achieve opening of the first static contact 101 and the third static contact 103.

[0041] As to whether to use a soft connection to achieve continuous connection with the third static contact 103 or to use the end of the moving contact rod 108 to abut against the third static contact 103 to achieve electrical conduction connection, technicians in this field can choose according to needs, and there is no special limitation on this.

[0042] It should be noted that, refer to Figure 1 As shown, the end of the movable contact rod 108 of the embodiment of the present application can be set to a clamping type, which can realize the clamping combination of the first static contact 101, the second static contact 102 and the third static contact 103. The end of the movable contact rod 108 of the embodiment of the present application can also be set to snap together to realize snap contact closing.

[0043] An embodiment of the present application provides a contact system, including a moving contact assembly 100, a first stationary contact 101, a second stationary contact 102 and a third stationary contact 103; the moving contact assembly 100 of the embodiment of the present application is driven to rotate through a first arc path to a first closing position 104 to connect the first stationary contact 101 and the third stationary contact 103; the moving contact assembly 100 of the embodiment of the present application is driven to rotate through a second arc path to a second closing position 105 to connect the second stationary contact 102 and the third stationary contact 103; the first arc path and the second arc path of the embodiment of the present application are located on both sides of the moving contact assembly 100, and at least one magnetic arc extinguishing member 106 is arranged on the first arc path and the second arc path. Compared with the prior art, the embodiment of the present application sets the first arc path and the second arc path on both sides of the moving contact assembly 100, so that the magnetic arc extinguishing member 106 can be arranged on both the first arc path and the second arc path, thereby greatly increasing the arrangement space of the magnetic arc extinguishing member 106, thereby effectively enhancing the magnetic arc extinguishing effect. In addition, the embodiment of the present application can prevent the arc from repeatedly burning on one path during circuit conversion through the arrangement of the first arc path and the second arc path, and the use of two arc running paths effectively increases the durability of the entire structural component, thereby greatly improving the service life of the conversion switch 111.

[0044] It should be noted that the magnetic pole direction of the magnetic arc extinguishing member 106 is perpendicular to the rotation plane of the moving contact assembly 100 ; the magnetic pole direction of the magnetic arc extinguishing member 106 is parallel to the rotation plane of the moving contact assembly 100 .

[0045] Those skilled in the art may arrange the magnetic poles of the magnetic arc extinguishing member 106 in the direction in accordance with the actual needs, in order to achieve effective electromagnetic arc extinguishing.

[0046] The magnetic arc extinguishing assembly may be one or more arranged along the rotation path of the end of the moving contact rod 108 to form a magnetic field along the arc running path, and the arc is pulled by the magnetic field to achieve rapid arc extinguishing.

[0047] Reference Figure 2 , Figure 3 as well as Figure 4 As shown, an embodiment of the present application provides a switching switch 111, including a switch housing 112 and the above-mentioned contact system, and the contact system is installed in the switch housing 112; wherein the magnetic arc extinguishing member 106 is installed on the moving contact assembly 100; and / or, the magnetic arc extinguishing member 106 is installed on the switch housing 112.

[0048] For example, refer to Figure 2 As shown, the magnetic arc extinguishing member 106 is embedded in the switch housing 112 and is arranged close to the first arc path and the second arc path. The N pole or S pole of the magnetic arc extinguishing member 106 is close to the arc path, so that the extension direction of the magnetic arc extinguishing member 106 is parallel to the rotation plane of the moving contact assembly 100. Preferably, the geometric center axis of the magnetic arc extinguishing member 106 is located on the rotation plane.

[0049] For example, refer to Figure 3 As shown, the magnetic arc extinguishing member 106 is embedded in the rotating bracket 107 and is arranged close to the first arc path and the second arc path. The extension direction of the magnetic arc extinguishing member 106 is parallel to the rotation plane of the moving contact assembly 100. Preferably, the geometric center axis of the magnetic arc extinguishing member 106 is located on the rotation plane.

[0050] For example, refer to Figure 4 As shown, the magnetic arc extinguishing member 106 is respectively embedded in the switch housing 112 on both sides of the first arc path and the second arc path. That is to say, the first arc path is provided with magnetic arc extinguishing members 106 on both sides of the rotation plane, and the magnetic arc extinguishing members 106 sandwich the first arc path. Similarly, the second arc path is provided with magnetic arc extinguishing members 106 on both sides of the rotation plane, and the magnetic arc extinguishing members 106 sandwich the second arc path. Among them, the extension direction of the magnetic arc extinguishing member 106 is perpendicular to the rotation plane of the moving contact assembly 100.

[0051] The conversion switch 111 of the embodiment of the present application can install the magnetic arc extinguishing member 106 on the switch housing 112, and can also install the magnetic arc extinguishing member 106 on the moving contact assembly 100 of the contact system. The magnetic arc extinguishing member 106 on the switch housing 112 is fixedly arranged, and the magnetic arc extinguishing member 106 on the moving contact assembly 100 can rotate with the moving contact assembly 100 to achieve dynamic pulling of the arc. Compared with the prior art, the embodiment of the present application can effectively improve the service life of the contact system and the conversion switch 111.

[0052] Reference Figure 3 As shown, as an optional embodiment, the switch housing 112 has a cavity 113 for installing the contact system; the switch housing 112 is provided with at least one exhaust channel 114, one end of the exhaust channel 114 is connected to the cavity 113, and the other end is connected to the external environment of the switch housing 112.

[0053] The specific number of the exhaust passages 114 can be set by those skilled in the art as required, and is not particularly limited thereto.

[0054] For example, refer to Figure 3 As shown, there are four exhaust channels 114; wherein, the air inlet port 115 of the first exhaust channel 114 is close to the closing contact portion of the first static contact 101; the air inlet port 115 of the second exhaust channel 114 is close to the closing contact portion of the second static contact 102; the air inlet ports 115 of the other two exhaust channels 114 are arranged on both sides of the third static contact 103; the four air inlet ports 115 are all arranged on the rotation path of the moving contact assembly 100.

[0055] Reference Figure 3 As shown, as an optional embodiment, the inner wall of the exhaust passage 114 has a guide structure 116 for making the air flow flow along an arc path.

[0056] It should be noted that the guide structure 116 disposed on the inner wall for exhaust gas to pass through may be a blocking plate alternately arranged at intervals along the extension path of the exhaust passage 114 , so that the airflow travels in a curved path in the exhaust passage 114 .

[0057] The flow guiding structure 116 can also directly configure the exhaust passage 114 to be curved, so that the airflow moves along a curve under the guidance of the inner wall of the exhaust passage 114 .

[0058] The embodiment of the present application can prevent the high-temperature airflow from directly spraying out of the conversion switch 111, prevent the high-temperature airflow from damaging the structural parts of the external environment of the conversion switch 111, and improve safety.

[0059] Reference Figure 4 As shown, as an optional embodiment, the inner wall of the switch housing 112 is provided with a protrusion structure arranged at intervals along the rotation path of the moving contact assembly 100; the protrusion structure includes a first rib 117 and a second rib 118; the first rib 117 intersects perpendicularly with the rotation plane of the moving contact assembly 100; the extension direction of the second rib 118 is parallel to the rotation plane of the moving contact assembly 100.

[0060] Further, see Figure 4 As shown, a third rib 119 is disposed on the side of the moving contact assembly 100 ; the extension direction of the third rib 119 is perpendicular to the rotation plane of the moving contact assembly 100 .

[0061] It should be noted that under the action of the magnetic arc extinguishing member 106, the arc will extend along the side walls of the switch housing 112 and the rotating bracket 107. The embodiment of the present application can increase the arc extension path when the arc moves close to the side wall through the arrangement of the first rib 117, the second rib 118 and the third rib 119, thereby facilitating the extinguishing of the arc and achieving rapid arc extinguishing.

[0062] Furthermore, arc extinguishing grids are also included, and the arc extinguishing grids are arranged alternately along the first arc path and the second arc path. It should be noted that the arc extinguishing grids can be combined with the magnetic arc extinguishing member 106 to form a combined arc extinguishing structure for enhancing the arc extinguishing effect, facilitating shortening the arc extinguishing time, and achieving rapid arc extinguishing.

[0063] Exemplarily, there are two groups of arc extinguishing grids arranged along the first arc path and the second arc path, respectively, and magnetic arc extinguishing members 106 are respectively provided on both sides of the arc extinguishing grids. The extension direction of the magnetic arc extinguishing members 106 is perpendicular to the rotation plane of the moving contact assembly 100.

[0064] In a preferred embodiment of the present application, the above-mentioned conversion switch 111 includes a switch housing 112 and a contact system, and the contact system is installed in the switch housing 112; the contact system includes a moving contact assembly 100, a first static contact 101, a second static contact 102 and a third static contact 103; the moving contact assembly 100 is driven to rotate through a first arc path to a first closing position 104 to connect the first static contact 101 and the third static contact 103; the moving contact assembly 100 is driven to rotate through a second arc path to a second closing position 105 to connect the second static contact 102 and the third static contact 103; the first arc path and the second arc path are located on both sides of the moving contact assembly 100, and at least one magnetic arc extinguishing member 106 is arranged on the first arc path and the second arc path. Among them, the magnetic pole direction of the magnetic arc extinguishing member 106 is perpendicular or parallel to the rotation plane of the moving contact assembly 100. The magnetic arc extinguishing member 106 is mounted on the moving contact assembly 100 , and the magnetic arc extinguishing member 106 is mounted on the switch housing 112 .

[0065] 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 system, characterized in that: The invention comprises a moving contact assembly (100), a first stationary contact (101), a second stationary contact (102) and a third stationary contact (103); the moving contact assembly (100) is driven to rotate to a first closing position (104) through a first arc path and connects the first stationary contact (101) and the third stationary contact (103); the moving contact assembly (100) is driven to rotate to a second closing position (105) through a second arc path and connects the second stationary contact (102) and the third stationary contact (103); the first arc path and the second arc path are located on both sides of the moving contact assembly (100), and at least one magnetic arc extinguishing member (106) is arranged on each of the first arc path and the second arc path.

2. The contact system according to claim 1, characterized in that: The magnetic pole direction of the magnetic arc extinguishing member (106) is perpendicular to the rotation plane of the moving contact assembly (100).

3. The contact system according to claim 1, characterized in that: The magnetic pole direction of the magnetic arc extinguishing member (106) is parallel to the rotation plane of the moving contact assembly (100).

4. The contact system according to claim 1, characterized in that: The moving contact assembly (100) comprises a rotating bracket (107) and a moving contact rod (108); the rotating bracket (107) is driven to drive the moving contact rod (108) to rotate in the forward direction, and the first end (109) of the moving contact rod (108) abuts against the first static contact (101), and the second end (110) of the moving contact rod (108) abuts against the third static contact (103); the rotating bracket (107) is driven to drive the moving contact rod (108) to rotate in the reverse direction, and the first end (109) of the moving contact rod (108) abuts against the third static contact (103), and the second end (110) of the moving contact rod (108) abuts against the second static contact (102).

5. A transfer switch, characterized in that: It comprises a switch housing (112) and a contact system as described in any one of claims 1 to 4, wherein the contact system is installed in the switch housing (112); wherein a magnetic arc extinguishing element (106) is installed on the moving contact assembly (100); and / or, the magnetic arc extinguishing element (106) is installed on the switch housing (112).

6. The transfer switch according to claim 5, characterized in that: The switch housing (112) has a cavity (113) in which the contact system is installed; the switch housing (112) is provided with at least one exhaust channel (114); one end of the exhaust channel (114) is connected to the cavity (113), and the other end is connected to the external environment of the switch housing (112).

7. The transfer switch according to claim 6, characterized in that: There are four exhaust channels (114); wherein, the air inlet port (115) of the first exhaust channel (114) is close to the closing contact portion of the first static contact (101); the air inlet port (115) of the second exhaust channel (114) is close to the closing contact portion of the second static contact (102); the air inlet ports (115) of the other two exhaust channels (114) are arranged on both sides of the third static contact (103); the four air inlet ports (115) are all arranged on the rotation path of the moving contact assembly (100).

8. The transfer switch according to claim 5, characterized in that: It also includes arc-extinguishing grids, which are arranged at intervals along the first arc path and the second arc path.

9. The transfer switch according to claim 5, characterized in that: The inner wall of the switch housing (112) is provided with protrusion structures arranged at intervals along the rotation path of the moving contact assembly (100); the protrusion structure comprises a first rib (117) and a second rib (118); the first rib (117) intersects perpendicularly with the rotation plane of the moving contact assembly (100); and the second rib (118) extends in a direction parallel to the rotation plane of the moving contact assembly (100).

10. The transfer switch according to claim 5, characterized in that: A third rib (119) is provided on the side of the moving contact assembly (100); the extension direction of the third rib (119) intersects perpendicularly with the rotation plane of the moving contact assembly (100).

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