Dustproof cover of change-over switch and change-over switch
By designing a dustproof cover to cover the operation hole and wiring hole of the conversion switch, the problem of dust or dust entering is solved, and the dustproof effect is achieved and convenient installation is ensured to ensure the normal working of the contacts.
Patent Information
- Application Number
- CN202421598077.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-07-08
AI Technical Summary
The operation holes and plug-in holes of the switch are prone to dust or dust entering, resulting in poor contact with the contacts and affecting the normal operation of the switch.
A dustproof cover is designed, including a main body and a boss. The main body covers the circumferential outer surface of the supporting shell covering the operation hole and the wiring hole. The boss and the operating hole are tightly matched and fixed. The dustproof cover is removable and equipped. The material is an insulating material and is elastic to adapt to dimensional errors. It is easy to install and remove by setting up the boss.
Effectively prevent dust or dust from entering the inside of the conversion switch, ensure the normal operation of the contacts, be stable in installation and easy to disassemble, and adapt to different size errors.
Smart Images
Figure CN223052038U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a dust cover, in particular to a dust cover for a change-over switch and a change-over switch including the same. Background Art
[0002] A change-over switch is a master switch that can control multiple circuits, and is mainly used for the conversion of various control circuits, the conversion of distribution device circuits, the control of a voltmeter, etc.
[0003] Operation holes for inserting tools to operate wiring screws and wire insertion holes for inserting wiring terminals are provided on the outer wall of the change-over switch. Dust or powder in the use environment easily enters the interior of the change-over switch through these holes and slowly deposits on the surface of the contacts, resulting in poor contact of the contacts and further causing the switch to fail. Utility Model Content
[0004] The purpose of the present application is to provide a dust cover for a change-over switch, which can effectively prevent dust or powder in the use environment from entering the interior of the change-over switch.
[0005] Another purpose of the present application is to provide a change-over switch, which can effectively prevent dust or powder in the use environment from entering the interior of the change-over switch.
[0006] The present application provides a dust cover for a change-over switch. The change-over switch has a contact module. The contact module includes a support housing and a static contact unit installed in the support housing. The static contact unit includes wiring screws. Operation holes for inserting tools to operate the wiring screws and wire insertion holes for inserting wiring terminals are provided on the circumferential wall of the support housing. The dust cover can be detachably installed on the support housing. The dust cover includes a main body and a boss. The main body can cover the outer circumferential surface of the support housing to radially cover the operation holes and the wire insertion holes. The boss protrudes from the surface of the main body. The boss can be inserted into the operation hole and form a tight fit with the hole wall of the operation hole to fix the dust cover to the support housing.
[0007] The dust cover of the change-over switch can effectively prevent dust or powder in the use environment from entering the interior of the change-over switch by covering the operation holes and the wire insertion holes. In addition, by providing the boss, the installation and removal of the dust cover are convenient and it is not easy to fall off after installation.
[0008] In another exemplary embodiment of the dust cover of the change-over switch, the operation hole is columnar, and the boss has a columnar portion and a frustum portion. One end of the columnar portion is connected to the main body. The cross-sectional shape of the columnar portion is the same as that of the operation hole. The columnar portion can be inserted into the operation hole and form a tight fit with the hole wall of the operation hole. The frustum portion is connected to the other end of the columnar portion. The conical surface of the frustum portion can play a guiding role when the boss is inserted into the operation hole, making the insertion easier.
[0009] In yet another illustrative embodiment of the dust cover of the change-over switch, the main body has a through-hole. The through-hole is positioned opposite to the wire insertion hole and is for the terminal to pass through. The main body also has a knockout part. The knockout part is located within the through-hole to block the through-hole. The knockout part is connected to the hole wall of the through-hole by a connecting structure. The knockout part can be detached from the main body by breaking the connecting structure. When a certain wire insertion hole is not needed, the corresponding knockout part can be retained to reduce the entry of dust or powder into the interior of the change-over switch.
[0010] In yet another illustrative embodiment of the dust cover of the change-over switch, the shape and size of the through-hole are set such that the terminal passing through the through-hole can squeeze the hole edge of the through-hole to elastically deform it, and the hole edge closely fits against the surface of the terminal under the action of the elastic restoring force. Thereby, the entry of dust or powder into the interior of the change-over switch can be reduced.
[0011] In yet another illustrative embodiment of the dust cover of the change-over switch, a groove extending axially is formed on the circumferential outer surface of the support housing. The wire insertion hole opens onto the groove wall. The dust cover is also provided with a pair of flanges for each wire insertion hole to be covered. Each flange can be inserted into the groove and fit against the groove wall to axially close the groove. The pair of flanges are axially spaced apart and are respectively located on both axial sides of the corresponding wire insertion hole. Thereby, the gap formed between the main body and the support housing at the groove can be closed, preventing dust or powder from entering the interior of the change-over switch through this gap.
[0012] In yet another illustrative embodiment of the dust cover of the change-over switch, the operation holes and the wire insertion holes formed in the support housing form at least one unit hole group. Each unit hole group is divided into two sub-hole groups that are symmetric about an axial cross-section of the support housing. Each sub-hole group includes two operation holes and two wire insertion holes, where the two operation holes and the two wire insertion holes are arranged circumferentially, and the two operation holes are located at both ends of the queue. Each dust cover corresponds to one sub-hole group. Each dust cover has two bosses and two pairs of flanges to respectively correspond to the two operation holes and the two wire insertion holes of one sub-hole group. This helps to improve the stability of the dust cover when installed on the support housing.
[0013] In yet another illustrative embodiment of the dust cover of the change-over switch, the dust cover is an integrally formed part made of an elastic material. Thereby, it is convenient for installation, can improve the compatibility with dimensional errors, and enhance the stability after installation.
[0014] The present application also provides a change-over switch, which has a contact module. The contact module includes a support housing and a stationary contact unit installed in the support housing. The stationary contact unit includes connection screws. An operation hole for inserting a tool to operate the connection screws and a wire insertion hole for inserting a wire terminal are formed in the circumferential wall of the support housing. The change-over switch includes the above-mentioned dust-proof cover. The dust-proof cover is detachably installed on the support housing. The main body covers the outer circumferential surface of the support housing to radially cover the operation hole and the wire insertion hole. The boss can be inserted into the operation hole and form a tight fit with the hole wall of the operation hole to fix the dust-proof cover to the support housing. The dust-proof cover of this change-over switch can effectively prevent dust or powder in the use environment from entering the interior of the change-over switch by covering the operation hole and the wire insertion hole. In addition, by providing the boss, the installation and removal of the dust-proof cover are convenient and it is not easy to fall off after installation.
[0015] In another schematic embodiment of the change-over switch, the support housing includes several sub-housings stacked axially and a pull rod. An assembly groove penetrating axially is recessed in the outer circumferential surface of the sub-housing. The pull rod is inserted into the assembly grooves of several sub-housings to fix the several sub-housings. An identification mark is provided on the surface of the pull rod exposed from the assembly groove. The dust-proof cover radially avoids the assembly groove. Thereby, the identification mark can be avoided from being blocked.
[0016] In still another schematic embodiment of the change-over switch, the contact module further includes a moving contact unit installed in the support housing. The change-over switch further includes a base and a change-over handle. The contact module is fixed to the base. The change-over handle can rotate relative to the base and can drive the moving contact unit to act by rotation to switch the conduction mode of the contact module. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The following drawings only schematically illustrate and explain the present application and do not limit the scope of the present application.
[0018] Figure 1 FIG. is a schematic structural diagram of a schematic embodiment of the change-over switch.
[0019] Figure 2 For Figure 1 the exploded view of the change-over switch shown in
[0020] Figure 3 For Figure 1 the exploded view of the support housing of the change-over switch shown in
[0021] Figure 4 shows a sub-housing and the moving contact unit and the stationary contact unit installed therein.
[0022] Figure 5 For Figure 1 the three-dimensional view of the dust-proof cover shown in
[0023] Figure 6 ForFigure 1 A perspective view of another angle of the dust cover shown.
[0024] Figure 7 Shows the state after the dust cover is installed on the Figure 4 structure shown.
[0025] Figure 8 Used to illustrate the state of elastic deformation of the hole edge after the through hole is penetrated by the terminal.
[0026] Figure 9 Is Figure 1 a top view of the support housing of the changeover switch shown.
[0027] Figure 10 Is Figure 1 another exploded view of the changeover switch shown.
[0028] Label description
[0029] 100 Dust cover 52 Wiring hole
[0030] 10 Main body 53 Groove
[0031] 11 Through hole 54 Sub-housing
[0032] 13 Knock-out part 541 Assembly groove
[0033] 20 Boss 55 Pull rod
[0034] 21 Columnar part 551 Identification mark
[0035] 22 Frustum part 56 Bottom shell
[0036] 40 Flange 60 Static contact unit
[0037] 200 Contact module 61 Wiring screw
[0038] 50 Support housing 70 Moving contact unit
[0039] 51 Operation hole 300 Base
[0040] 400 Changeover handle L axis
[0041] 500 Terminal C circumferential
[0042] 600 Rotating shaft A axial
[0043] 700 Cam F cross-section Detailed implementation method
[0044] For a clearer understanding of the technical features, objectives, and effects of the application, the specific implementation of the application will now be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote components having the same or similar structures and the same functions.
[0045] In this document, "schematic" means "serving as an example, instance, or illustration". Any illustration or implementation described as "schematic" in this document should not be construed as a more preferred or advantageous technical solution.
[0046] To simplify the drawings, only the parts relevant to the application are schematically shown in each figure, and they do not represent the actual structure of the product as a whole. In this patent application, nouns and pronouns related to people are not limited to specific genders.
[0047] Figure 1 A change-over switch is shown, which is used to illustrate a schematic implementation of the dust cover of the change-over switch. Figure 2 For Figure 1 the exploded view of the change-over switch shown. As Figure 1 and Figure 2 shown, the change-over switch includes a contact module 200, a base 300, and a change-over handle 400. The change-over handle 400 can rotate relative to the base 300 about an axis L. For the sake of convenience of description, an axial direction A and a circumferential direction C are defined herein. The axial direction A is parallel to the axis L, and the circumferential direction C has the axis L as the central axis. The contact module 200 is fixed to the base 300. The contact module 200 includes a support housing 50 and a stationary contact unit and a moving contact unit installed in the support housing 50. The change-over handle 400 can drive the moving contact unit to act by rotation to switch the conduction mode of the contact module 200. The change-over switch further includes a transmission member installed on the base 300, which includes, for example, a rotating shaft 600 and a cam 700. The rotating shaft 600 is used to connect the change-over handle 400, and the cam 700 is used to abut against the moving contact unit to act.
[0048] Figure 3 The exploded structure of the support housing 50 is shown. As Figure 2 and Figure 3 shown, the support housing 50 is, for example, composed of two sub-housings 54, two tie rods 55, and a bottom shell 56. The two sub-housings 54 and the bottom shell 56 are overlapped along the axial direction A and are connected into a whole by the two tie rods 55. In other schematic implementations, the number of sub-housings 54 in the support housing 50 can be adjusted as needed. Of course, the support housing 50 can also have other structures.
[0049] Figure 4Shows two static contact units 60 and two moving contact units 70 installed within a sub-housing 54. One static contact unit 60 and one moving contact unit 70 on the upper side form a contact group, which is in an open state, and one static contact unit 60 and one moving contact unit 70 on the lower side form a contact group, which is in a closed state. Two static contact units 60 and two moving contact units 70 are installed as shown in each sub-housing 54 of the support housing 50. Each contact group can achieve the conduction and disconnection of two static contacts in the static contact unit 60 through the movement of the moving contact unit 70. As Figure 4 shown, each static contact unit 60 includes two wiring screws 61, corresponding to the two static contacts of the static contact unit 60 respectively. The wiring screws 61 are used to connect the wiring ends of the cables inserted into the changeover switch.
[0050] As Figure 2 and Figure 4 shown, an operation hole 51 for inserting a tool to operate the wiring screw 61 and a wiring hole 52 for inserting the wiring end of the cable are provided in the circumferential wall of the support housing 50.
[0051] The dust cover 100 can be detachably installed on the support housing 50, where Figure 1 shows the installed state, Figure 2 shows the detached state. Figure 5 and Figure 6 show the three-dimensional structure of the dust cover 100. As Figure 5 and Figure 6 shown, the dust cover 100 includes a main body 10 and a boss 20. As Figure 1 shown, the main body 10 can cover the circumferential outer surface of the support housing 50 to cover the operation hole 51 and the wiring hole 52 in the radial direction, where the radial direction is centered on the axis L. The main body 10 is, for example, in a strip shape, which can make the volume more compact, but is not limited thereto. The boss 20 protrudes from the surface of the main body 10. Figure 7 shows the state after installing the dust cover 100 on the basis of Figure 6 . As Figure 7 shown, the boss 20 can be inserted into the operation hole 51 and form a tight fit with the hole wall of the operation hole 51 to fix the dust cover 100 to the support housing 50.
[0052] The dust cover of this changeover switch can effectively prevent dust or powder in the use environment from entering the interior of the changeover switch by covering the operation hole and the wiring hole. In addition, by providing the boss, the installation and removal of the dust cover are convenient and it is not easy to fall off after installation.
[0053] It can be understood that in other schematic embodiments, the specific structure of the dust cover should be adaptively adjusted according to the specific structure of the changeover switch using it.
[0054] In a schematic embodiment, the dust cover 100 is an integrally formed part made of an elastic material. This facilitates installation, improves compatibility with dimensional errors, and enhances the stability after installation. The material of the dust cover 100 should be an insulating material. The material of the dust cover 100 is, for example, silicone, but is not limited thereto.
[0055] Specifically, in this schematic embodiment, the operation holes 51 and the wire insertion holes 52 formed in the support housing 50 form two unit hole groups arranged along the axial direction A. Figure 4 The four operation holes 51 and the four wire insertion holes 52 shown in form a unit hole group. Each unit hole group is divided into two sub-hole groups symmetric about an axial section F of the support housing 50. Figure 4 In, the two operation holes 51 and the two wire insertion holes 52 on the upper side form a sub-hole group, and the two operation holes 51 and the two wire insertion holes 52 on the lower side form another sub-hole group. As Figure 4 shown, the two operation holes 51 and the two wire insertion holes 52 of each sub-hole group are arranged along the circumferential direction C, and the two operation holes 51 are located at both ends of the queue. As Figure 7 shown, each dust cover 100 corresponds to a sub-hole group, that is, the main body 10 of each dust cover 100 can cover the two operation holes 51 and the two wire insertion holes 52 of the corresponding sub-hole group along the radial direction. Each dust cover 100 has two bosses 20 to respectively correspond to the two operation holes 51 of a sub-hole group. This helps to improve the stability of the dust cover installed on the support housing.
[0056] In a schematic embodiment, as Figure 4 shown, the operation hole 51 is columnar. Refer to Figure 5 , the boss 20 has a columnar portion 21 and a frustum portion 22. One end of the columnar portion 21 is connected to the main body 10. The columnar portion 21 has the same cross-sectional shape as the operation hole 51. The columnar portion 21 can be inserted into the operation hole 51 and form a tight fit with the hole wall of the operation hole 51. The frustum portion 22 is connected to the other end of the columnar portion 21, and its conical surface can play a guiding role when the boss 20 is inserted into the operation hole 51 to make the insertion easier.
[0057] As Figure 6 shown, in a schematic embodiment, the main body 10 has a through hole 11. The through hole 11 is opposite to the wire insertion hole 52 in position and is used for the wiring end of the cable to pass through. The main body 10 also has a knockout portion 13. The knockout portion 13 is located in the through hole 11 to block the through hole 11. The knockout portion 13 is connected to the hole wall of the through hole 11 through a connecting structure. The knockout portion 13 can be detached from the main body 10 by breaking the connecting structure. The connecting structure is, for example, several connecting ribs arranged at intervals along the edge of the knockout portion 13, but is not limited thereto. During use, the knockout portion 13 can be conveniently detached by breaking the connecting structure to expose the through hole 11. When a certain wire insertion hole 52 is not needed, the corresponding knockout portion 13 can be retained to reduce the entry of dust or powder into the inside of the changeover switch.
[0058] In a schematic embodiment, the shape and size of the through hole 11 are set such that the terminal passing through the through hole 11 can squeeze the hole edge of the through hole 11 to elastically deform it, and the hole edge is in close contact with the surface of the terminal under the action of the elastic restoring force. Figure 8 A cross-sectional view of the dust cover 100 is shown, in which the upper through hole 11 is penetrated by the terminal 500, and its hole edge is elastically deformed and in contact with the surface of the terminal 500. Thereby, the entry of dust or powder into the inside of the changeover switch can be reduced.
[0059] As Figure 2 shown, in a schematic embodiment, a groove 53 extending in the axial direction A is formed on the circumferential outer surface of the support housing 50. Figure 9 A top view of the support housing 50 is shown, in which four grooves 53 of the support housing 50 are shown filled with dots. As Figure 2 shown, the wire insertion hole 52 opens on the groove wall of the groove 53. As Figure 5 shown, each dust cover 100 is also provided with a pair of flanges 40 for each wire insertion hole 52 to be covered by it. Figure 10 For Figure 1 another exploded view of the changeover switch shown, as Figure 10 shown, each flange 40 can be inserted into the groove 53 and be in contact with the groove wall of the groove 53 to close the groove 53 in the axial direction A. The pair of flanges 40 are spaced apart in the axial direction A and are respectively located on both sides of the corresponding wire insertion hole 52 in the axial direction A. Thereby, the gap formed between the main body 10 and the support housing 50 at the groove 53 can be closed, preventing dust or powder from entering the inside of the changeover switch through this gap.
[0060] In a schematic embodiment, the surface of the dust cover 100 has an indication mark, as Figure 1 shown, the indication mark is, for example, in the shape of an arrow to indicate the installation direction of the dust cover 100. The indication mark is, for example, in the form of a convex block, a groove, or a printed form.
[0061] This application also provides a changeover switch, Figure 1 and Figure 2Shows a schematic embodiment of a changeover switch, the changeover switch having a contact module 200. The contact module 200 includes a support housing 50 and a stationary contact unit 60 mounted within the support housing 50. The stationary contact unit 60 includes a connection screw 61. The circumferential wall of the support housing 50 is provided with an operation hole 51 for inserting a tool to operate the connection screw 61 and a wire insertion hole 52 for inserting the connection end of the pre-connected stationary contact unit 60. The changeover switch includes the above-mentioned dust cover 100. The dust cover 100 is detachably mounted on the support housing 50. The main body 10 covers the outer circumferential surface of the support housing 50 to radially cover the operation hole 51 and the wire insertion hole 52. The boss 20 can be inserted into the operation hole 51 and form a tight fit with the hole wall of the operation hole 51 to fix the dust cover 100 to the support housing 50. The dust cover of this changeover switch can effectively prevent dust or powder in the use environment from entering the interior of the changeover switch by covering the operation hole and the wire insertion hole. In addition, by providing the boss, the installation and removal of the dust cover are convenient and it is not easy to fall off after installation.
[0062] The specific features of the changeover switch of this schematic embodiment have been described above and will not be elaborated here.
[0063] In other schematic embodiments, the number of sub-housings 54 and tie rods 55 of the support housing 50 can be adjusted as needed, and the number of unit hole groups, moving contact units, and stationary contact units is also adjusted accordingly. Of course, in other schematic embodiments, the support housing 50 can also be of other structures. It can be understood that in other schematic embodiments, the specific structure of the dust cover should be adaptively adjusted according to the specific structure of the changeover switch using it.
[0064] As Figure 3 shown, in the schematic embodiment, an assembly groove 541 penetrating axially along A is recessed on the outer circumferential surface of the sub-housing 54. The tie rod 55 is inserted into the assembly grooves 541 of several sub-housings 54 to fix the several sub-housings 54. An identification mark 551 is provided on the surface of the tie rod 55 exposed from the assembly groove 541, and the identification mark 551 is used, for example, to display the number of the wire insertion hole 52. The dust cover 100 radially avoids the assembly groove 541. This can avoid blocking the identification mark 551.
[0065] It should be understood that although this specification is described according to each embodiment, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0066] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of this application, and they are not intended to limit the protection scope of this application. Any equivalent implementation schemes or changes made without departing from the technical spirit of this application, such as the combination, division, or repetition of features, shall be included within the protection scope of this application.
Claims
1. A dust cover for a transfer switch, the transfer switch having a contact module (200), the contact module (200) comprising a support shell (50) and a stationary contact unit (60) installed in the support shell (50), the stationary contact unit (60) comprising a wiring screw (61), the circumferential wall of the support shell (50) being provided with an operating hole (51) for inserting a tool to operate the wiring screw (61) and a wire insertion hole (52) for inserting a wiring terminal, characterized in that: The dust cover can be detachably mounted on the support shell (50), and the dust cover comprises: A main body (10), the main body (10) being capable of covering the circumferential outer surface of the support shell (50) so as to cover the operating hole (51) and the wire insertion hole (52) in the radial direction; and A boss (20), wherein the boss (20) is protruding from the surface of the main body (10), and the boss (20) can be inserted into the operating hole (51) and form a tight fit with the hole wall of the operating hole (51) to fix the dust cover to the supporting shell (50).
2. The dust cover of the transfer switch according to claim 1, characterized in that: The operating hole (51) is columnar, the boss (20) comprises a columnar portion (21) and a frustum portion (22), one end of the columnar portion (21) is connected to the main body (10), the columnar portion (21) has the same cross-sectional shape as the operating hole (51), the columnar portion (21) can be inserted into the operating hole (51) and form a tight fit with the hole wall of the operating hole (51), and the frustum portion (22) is connected to the other end of the columnar portion (21).
3. The dust cover of the transfer switch according to claim 1, characterized in that: The main body (10) has a through hole (11), the through hole (11) is opposite to the wire insertion hole (52) and is used for the wiring terminal to pass through, the main body (10) also has a knock-off portion (13), the knock-off portion (13) is located in the through hole (11) to cover the through hole (11), the knock-off portion (13) is connected to the hole wall of the through hole (11) through a connecting structure, and the knock-off portion (13) can be detached from the main body (10) by destroying the connecting structure.
4. The dust cover of the transfer switch according to claim 3, characterized in that: The shape and size of the through hole (11) are set so that the terminal passing through the through hole (11) can squeeze the hole edge of the through hole (11) to elastically deform it, and the hole edge is tightly fitted with the surface of the terminal under the action of elastic restoring force.
5. The dust cover of the switching switch according to claim 1, wherein the peripheral outer surface of the support housing (50) is formed with a groove (53) extending along the axial direction (A), and the wire insertion hole (52) opens to the groove wall of the groove (53), characterized in that: The dust cover is also provided with a pair of flanges (40) for each of the wire insertion holes (52) to be covered, and each of the flanges (40) can be inserted into the groove (53) and fit with the groove wall of the groove (53) to close the groove (53) along the axial direction (A). The pair of flanges (40) are arranged at intervals along the axial direction (A) and are respectively located on both sides of the corresponding wire insertion hole (52) along the axial direction (A).
6. The dust cover of the transfer switch according to claim 5, characterized in that: The operating holes (51) and the wire insertion holes (52) opened in the support shell (50) form at least one unit hole group, each of the unit hole groups is divided into two sub-hole groups symmetrical along an axial section (F) of the support shell (50), each of the sub-hole groups includes two operating holes (51) and two wire insertion holes (52), wherein the two operating holes (51) and the two wire insertion holes (52) are arranged along the circumferential direction (C), and the two operating holes (51) are located at both ends of the queue, each of the dust covers corresponds to one of the sub-hole groups, and each of the dust covers has two bosses (20) and two pairs of flanges (40) to respectively correspond to the two operating holes (51) and the two wire insertion holes (52) of one of the sub-hole groups.
7. The dust cover of the transfer switch according to claim 1, characterized in that: The dust cover is an integrally formed part made of elastic material.
8. A transfer switch, the transfer switch comprising a contact module (200), the contact module (200) comprising a support shell (50) and a stationary contact unit (60) installed in the support shell (50), the stationary contact unit (60) comprising a wiring screw (61), the circumferential wall of the support shell (50) being provided with an operating hole (51) for inserting a tool to operate the wiring screw (61) and a wire insertion hole (52) for inserting a wiring terminal, characterized in that: The switching switch comprises a dust cover as described in any one of claims 1 to 7, wherein the dust cover is detachably mounted on the supporting shell (50), the main body (10) covers the circumferential outer surface of the supporting shell (50) to radially cover the operating hole (51) and the wire insertion hole (52), and the boss (20) can be inserted into the operating hole (51) and form a tight fit with the hole wall of the operating hole (51) to fix the dust cover to the supporting shell (50).
9. The transfer switch according to claim 8, characterized in that: The supporting shell (50) comprises: A plurality of sub-shells (54) stacked in the axial direction (A), wherein the circumferential outer surface of the sub-shell (54) is provided with a mounting groove (541) penetrating in the axial direction (A), and the dust cover avoids the mounting groove (541) in the radial direction; and A pull rod (55) is inserted into the assembly grooves (541) of the plurality of sub-shells (54) to fix the plurality of sub-shells (54), and an identification mark (551) is provided on the surface of the pull rod (55) exposed from the assembly groove (541).
10. The transfer switch according to claim 8, characterized in that: The contact module (200) further comprises a moving contact unit (70) installed in the supporting housing (50), and the switching switch further comprises: a base (300), the contact module (200) being fixed to the base (300); and A switching handle (400) is rotatable relative to the base (300) and can drive the moving contact unit (70) to move by the rotation, so as to switch the conduction mode of the contact module (200).