CN214227362U - Ring main unit and three-position switch thereof - Google Patents
Ring main unit and three-position switch thereof Download PDFInfo
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- CN214227362U CN214227362U CN202120443630.1U CN202120443630U CN214227362U CN 214227362 U CN214227362 U CN 214227362U CN 202120443630 U CN202120443630 U CN 202120443630U CN 214227362 U CN214227362 U CN 214227362U
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Abstract
The utility model provides a looped netowrk cabinet and three station switches thereof, this looped netowrk cabinet include three station switches, and this three station switches include mechanism input shaft and at least a switch unit. The switch unit comprises a crank arm plate, a grounding contact, an insulating connecting plate and a moving contact. The crank arm plate is fixedly connected with the mechanism input shaft, can rotate along with the rotation of the mechanism input shaft and is provided with a first end and a second end. The ground contact is connected with the first end of the crank arm plate, and one end of the insulating connecting plate is connected with the second end of the crank arm plate. The moving contact is movably connected with the other end of the insulating connecting plate, the first end of the moving contact is movably connected with the moving contact seat, the second end of the moving contact is a free end, and the connecting point of the moving contact and the insulating connecting plate is located between the first end of the moving contact and the second end of the moving contact. When the mechanism input shaft rotates towards the grounding closing direction, the moving contact and the grounding contact move relatively and move towards the closing direction.
Description
Technical Field
The utility model relates to the technical field of electrical equipment, in particular to looped netowrk cabinet and three-station switch thereof.
Background
The three-position switch is used as an important element in a primary electric loop in the ring main unit, needs to bear rated continuous current, rated short-time withstand current and rated closing current, and needs to meet the requirements of reliable connection, high stability, small contact resistance and the like. The three-position switch integrates the functions of an isolating switch and a grounding switch, and the mechanical locking is realized by one moving contact. The three stations refer to three working positions: firstly, switching-on position of the main fracture of the isolating switch; secondly, an isolated position where the main fracture is separated; and thirdly, grounding position of the grounding side. When a rated short circuit closing current test of the grounding switch is performed on the three-position switch, the closing speed of the grounding part is required to be increased, however, the closing speed of the grounding part of the traditional three-position switch is increased by increasing the operation power of the operating mechanism of the three-position switch, the service lives of the operating mechanism and the three-position switch are reduced, and the stability of a product is not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the service life and the stability are reduced when the switching-on speed of the grounding part is increased by increasing the operation power of the operating mechanism in the related art, the disclosure provides another ring main unit capable of increasing the switching-on speed of the grounding part and a three-position switch thereof.
The utility model provides a three-station switch, its characterized in that is applied to the looped netowrk cabinet, includes:
the mechanism input shaft can be connected with the three-station operating mechanism and is driven by the three-station operating mechanism to rotate; and
at least one switch unit, each switch unit comprising:
the crank arm plate is fixedly connected with the mechanism input shaft and can rotate along with the rotation of the mechanism input shaft, and the crank arm plate is provided with a first end and a second end;
a ground contact connected to a first end of the throw arm plate;
one end of the insulating connecting plate is connected with the second end of the crank arm plate;
the movable contact is movably connected with the other end of the insulation connecting plate, the first end of the movable contact is movably connected with a movable contact seat, the movable contact seat can be fixed on a fixed frame, the fixed frame is fixed on the inner wall of the gas tank of the ring main unit, the second end of the movable contact is a free end, and a connection point of the movable contact and the insulation connecting plate is positioned between the first end of the movable contact and the second end of the movable contact;
when the mechanism input shaft rotates towards the grounding closing direction, the moving contact and the grounding contact move relatively and both move towards the closing direction.
Optionally, the area of the first end of the arm-bending plate is larger than the area of the second end.
Optionally, the area of the bell crank plate decreases gradually from the first end to the second end.
Optionally, the distance from the connection point of the crank arm plate and the ground contact to the mechanism input shaft is smaller than the distance from the connection point of the crank arm plate and the insulating connection plate to the mechanism input shaft;
the pin shaft at the joint of the crank arm plate and the insulating connecting plate and the mechanism input shaft are in the same straight line, and the connection point of the first end of the crank arm plate and the grounding contact deviates from the straight line.
Optionally, the switch unit further includes an isolation fixed contact, the isolation fixed contact is fixed on an isolation contact base, the isolation contact base can be fixed on the fixed frame, and the second end of the moving contact can be electrically connected to the ground contact or the isolation fixed contact under the driving of the mechanism input shaft;
when the three-station switch is used for grounding and opening, and the mechanism input shaft rotates towards a first direction, the first end of the crank arm plate drives the grounding contact to rotate towards the first direction, and the second end of the crank arm plate drives the movable contact to rotate towards a second direction opposite to the first direction through the insulating connecting plate, so that the grounding contact and the movable contact simultaneously move towards the opening direction;
when the three-station switch is grounded and switched on, the mechanism input shaft rotates towards the second direction, the first end of the turning arm plate drives the grounding contact to rotate towards the second direction, and the second end of the turning arm plate drives the moving contact to rotate towards the first direction through the insulating connecting plate, so that the moving contact and the grounding contact simultaneously move towards the switching-on direction.
Optionally, the isolation fixed contact is located on a path through which the moving contact rotates in the first direction, and the ground contact is located on a path through which the moving contact rotates in the second direction.
Optionally, the moving contact and the insulating connecting plate are both in a long-strip plate shape, and a connection point of the moving contact and the insulating connecting plate is located in the middle of the moving contact.
Optionally, the three-position switch further includes a ground busbar, and the ground busbar is connected with the shell of the ring main unit through a flexible connection;
the ground contact is connected to the ground strap.
Optionally, the three-position switch is applied to a three-phase current switching device, each phase of current is correspondingly provided with one switch unit, and the crank arm plates of each switch unit are arranged on the mechanism input shaft at intervals;
the ground contact of each switch unit is connected to the ground bus.
The invention provides a ring main unit which comprises an air box, the three-position switch arranged in the air box and a three-position operating mechanism arranged in a mechanism chamber;
a fixed frame is arranged on the inner wall of the gas box, a moving contact seat of the three-position switch is fixed on the fixed frame, and insulating gas is filled in the gas box;
the three-station operating mechanism is connected with a mechanism input shaft of the three-station switch and can drive the mechanism input shaft to rotate.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the utility model provides a three-position switch, this three-position switch include mechanism input shaft and at least a switch unit, this mechanism input shaft can be connected with three-position operating device to take place to rotate under three-position operating device's drive. The switch unit comprises a crank arm plate, a grounding contact, an insulating connecting plate and a moving contact. The crank arm plate is fixedly connected with the mechanism input shaft and can rotate along with the rotation of the mechanism input shaft, and the crank arm plate is provided with a first end and a second end. The ground contact is connected with the first end of the crank arm plate, and one end of the insulating connecting plate is connected with the second end of the crank arm plate. The moving contact is movably connected with the other end of the insulating connecting plate, the first end of the moving contact is movably connected with the moving contact seat, the moving contact seat can be fixed on the fixed frame, the fixed frame is fixed on the inner wall of the air box of the ring main unit, the second end of the moving contact is a free end, and the connecting point of the moving contact and the insulating connecting plate is located between the first end of the moving contact and the second end of the moving contact. When the mechanism input shaft rotates towards the grounding closing direction, the moving contact and the grounding contact move relatively and move towards the closing direction. Because ground contact and moving contact relative motion to move toward ground connection combined floodgate direction simultaneously, so increased the combined floodgate speed of ground contact and moving contact, can effectively reduce electric arc arcing time, reduce the contact ablation, increase the life of product. Compared with the prior art that the closing speed is increased by increasing the spring energy and the like to increase the mechanism operation power, the service life of the operation mechanism and the three-position switch is prolonged, and the stability of the product is improved.
The utility model also provides a looped netowrk cabinet, this looped netowrk cabinet include the gas tank, set up at the inside foretell three-station switch of gas tank and set up the three-station operating device in the mechanism room. The inner wall of the gas box is provided with a fixed frame, a moving contact seat of the three-position switch is fixed on the fixed frame, and the gas box is filled with insulating gas. The three-position operating mechanism is connected with a mechanism input shaft of the three-position switch and can drive the mechanism input shaft to rotate. Because this disclosed looped netowrk cabinet adopts above-mentioned three station switches can effectively reduce the electric arc time of arcing of three station switches, reduces the contact ablation, increases the life of product.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic perspective view illustrating a disconnecting switch portion and a grounding switch portion of a three-position switch in an open state according to an exemplary embodiment.
Fig. 2 is a cross-sectional view of a three-position switch showing both the disconnect switch portion and the ground switch portion in an open state, according to an exemplary embodiment.
Fig. 3 is a cross-sectional view of a three-position switch showing a disconnector part in a closed position and a grounding switch part in an open position, according to an exemplary embodiment.
Fig. 4 is a cross-sectional view of a three-position switch showing a disconnect switch portion in an open state and a ground switch portion in a closed state, according to an exemplary embodiment.
Detailed Description
For further explanation of the principles and construction of the present disclosure, reference will now be made in detail to the preferred embodiments of the present disclosure, which are illustrated in the accompanying drawings.
The present disclosure provides a three-position switch, which can be applied to a ring main unit. The ring main unit includes a housing divided into a plurality of compartments, such as a low pressure chamber, a mechanism chamber, an air box, a cable chamber, and the like. The ring main unit further comprises a circuit breaker switch arranged in the gas box, a three-position switch and a three-position operating mechanism arranged in the mechanism chamber, wherein the gas box is filled with insulating gas, and the insulating gas can be sulfur hexafluoride gas for example. The three-station operating mechanism drives the three-station switch to act so as to realize grounding switching-on and switching-off or separating, clutching and switching-off.
As shown in fig. 1, the present disclosure provides a three-position switch 100, where the three-position switch 100 includes at least one switch unit 10 and a mechanism input shaft 20, and the mechanism input shaft 20 is connected to a three-position operating mechanism located in a mechanism chamber, and is driven by the three-position operating mechanism to rotate clockwise or counterclockwise around itself.
The three-position switch 100 can be used in a three-phase current switchgear. As shown in fig. 1, the three-position switch 100 employs a switching device using three-phase current, and a switching unit 10 is provided corresponding to each phase, that is, the three-position switch 100 has three switching units 10. Each switch unit 10 comprises a rocker arm plate 11, a grounding contact 12, an insulating connecting plate 13 and a movable contact 14. The grounding contact 12 and the movable contact 14 of each switch unit 10 are arranged on the same mechanism input shaft 20 through respective crank arm plates 11, and are driven by the mechanism input shaft 20 to move. The crank arm plates 11 are arranged at intervals on the mechanism input shaft 20.
The crank arm plate 11 is provided with an opening for the mechanism input shaft 20 to pass through. The crank arm plate 11 is fixedly connected to the mechanism input shaft 20 by welding, and can rotate by rotating the mechanism input shaft 20. The crank arm plate 11 has a first end 11a and a second end 11 b.
The crank arm plate 11 has a plate-like structure with a large end and a small end. The crank arm plate 11 may be a double-plate structure. One end of the ground contact 12 is held between the two plates at the first end 11a of the crank arm plate 11 and fixed by a fastener. The fastener may be a connecting bolt or screw or the like. One end of the insulating connecting plate 13 is clamped between the two plates at the second end 11b of the crank arm plate 11 and connected by a pin 111. The insulating connecting plate 13 can swing around the pin 111 relative to the crank arm plate 11. The insulating connecting plate 13 and the crank arm plate 11 form an angle therebetween, which changes with the rotation of the input shaft 20.
The first end 11a of the crank arm plate 11 has a larger area than the second end 11b, and the area of the crank arm plate 11 is gradually reduced from the first end 11a to the second end 11 b. The pin 111 at the connection point of the crank arm plate 11 and the insulating connecting plate 13 is in the same straight line with the mechanism input shaft 20, and the connection point of the first end 11a of the crank arm plate 11 and the ground contact 12 deviates from the straight line. The distance from the connecting point of the crank arm plate 11 and the grounding contact 12 to the mechanism input shaft 20 is smaller than the distance from the connecting point of the crank arm plate 11 and the insulating connecting plate 13 to the mechanism input shaft 20.
The toggle arm plate 13 of each corresponding switch unit 10 is connected to the mechanism input shaft 20.
The ground contact 12 includes a vertical portion and a horizontal portion, and the vertical portion is connected to the crank arm plate 11 and is driven by the crank arm plate 11 to rotate. The vertical portion is connected to the ground busbar 18. The grounding bus bar 18 is connected with the shell of the ring main unit through a flexible connection, so that reliable grounding is formed. As shown in fig. 1, the three-position switch has three ground contacts 12, and a lateral portion of each ground contact 12 is connected to a ground busbar 18.
As described above, one end of the insulating connecting plate 13 is connected to the second end 11b of the toggle plate 11, and the other end of the insulating connecting plate 13 is connected to the movable contact 14 through the pin 143. The first end 141 of the movable contact 14 is movably connected to the movable contact block 15. A fixed frame (not shown) is fixed on the inner wall of the air box of the ring main unit, the fixed frame includes a plurality of supports, and the movable contact base 15 is fixed on one of the supports of the fixed frame. The second end 142 of the movable contact 14 is a free end. The connection point of the movable contact 14 and the insulating connecting plate 13 is located between the first end 141 and the second end 142 of the movable contact 14. Alternatively, the connection point of the movable contact 14 and the insulating connecting plate 13 is located at the middle position of the movable contact 14 or in the area close to the middle position.
The insulating connecting plate 13 and the movable contact 14 are both in the form of a long plate. Alternatively, the insulating connecting plate 13 and the movable contact 14 may be of a double-layer structure.
The insulating connecting plate 13, the crank arm plate 11 and the moving contact 14 form an I shape, and the insulating connecting plate 13 can be twisted relative to the crank arm plate 11 and the moving contact 14, namely, an included angle between the insulating connecting plate 13 and the crank arm plate 11 and the moving contact 14 is changed.
The switch unit 10 further includes an isolation stationary contact 16, the isolation stationary contact 16 is fixed on an isolation contact seat 17, the isolation contact seat 17 is fixed on another support of the fixed frame, the isolation contact seat 17 and the moving contact seat 15 can be located on the same vertical surface of the gas tank, and the moving contact seat 15 is located below the isolation contact seat 17. Alternatively, the isolating contact block 17 and the movable contact block 15 may be located on the bottom surface of the air box or on different sides of the air box.
The second end 142 of the movable contact 14 can be electrically connected to or separated from the isolated stationary contact 16 by the driving of the mechanism input shaft 20. The isolated stationary contact 16 is located on a path of the movable contact 14 rotating in a first direction (e.g., clockwise), and the ground contact 12 is located on a path of the movable contact 13 rotating in a second direction (e.g., counterclockwise) opposite to the first direction. Thus, when the movable contact 14 rotates around the first end 141 in the first direction and rotates to a certain angle, the second end 142 of the movable contact 14 is electrically connected to the isolated stationary contact 16; when the movable contact 14 rotates in the second direction around the first end 141 and rotates to a certain angle, the second end 142 of the movable contact 14 is electrically connected to the ground contact 12, so as to achieve the isolation switching on/off and the grounding switching on/off.
When the mechanism input shaft 20 rotates, the crank arm plate 11 is driven to rotate, the crank arm plate 11 drives the grounding contact 12 and the insulating connecting plate 13 to rotate, and the movable contact 14 moves in the opposite direction relative to the grounding contact 12 under the pulling of the insulating connecting plate 13. Specifically, as shown in fig. 1 and fig. 2, the three-position switch 100 is in an isolation switching-off state and an earthing switching-off state, when the isolation switch part is switched on, when the mechanism input shaft 20 moves in a first direction (for example, clockwise), the mechanism input shaft 20 drives the crank arm plate 11 to rotate, the first end 11a of the crank arm plate 11 drives the earthing contact 12 to rotate in the first direction, the second end 11b of the crank arm plate 11 drives the movable contact 14 to rotate around the first end 141 thereof in a second direction (for example, counterclockwise) opposite to the first direction through the insulating connecting plate 13, that is, the second end 142 of the movable contact 14 approaches to the direction of the isolation fixed contact 16 under the pushing of the insulating connecting plate 13 and rotates for a certain angle, and after the second end 142 of the movable contact 14 is electrically contacted with the isolation fixed contact 16, as shown in fig. 3, the isolation switching-on state is realized.
When the isolating switch part is opened, the mechanism input shaft 20 rotates in the second direction (i.e. counterclockwise), the charged crank arm plate 11 rotates, the insulating connecting plate 13 drives the moving contact 14 to move in the isolating and opening direction, and as shown in fig. 2, the isolating switch part returns to the opening state.
When the earthing switch part is switched on (at this time, the disconnecting switch part and the earthing part are both in an open state), the mechanism input shaft 20 moves in the second direction (for example, counterclockwise), the mechanism input shaft 20 drives the crank arm plate 11 to rotate, the first end 11a of the crank arm plate 11 drives the earthing contact 12 to rotate in the second direction, the second end 11b of the crank arm plate 11 drives the movable contact 14 to rotate around the first end 141 thereof in the first direction (for example, clockwise) through the insulating connecting plate 13, that is, the second end 142 of the movable contact 14 approaches the earthing contact 12 under the pulling of the insulating connecting plate 13 and rotates for a certain angle, as shown in fig. 4, the second end 142 of the movable contact 14 is electrically contacted with the earthing contact 12, so as to achieve the switching-on and earthing. Because the grounding contact 12 and the moving contact 14 move relatively and move towards the grounding closing direction at the same time, the closing speed of the grounding contact 12 and the moving contact 14 is increased, the arc burning time can be effectively reduced, the contact ablation is reduced, and the service life of a product is prolonged. Compared with the prior art that the switching-on speed is increased by increasing the spring energy and other modes of increasing the mechanism operation power, the three-position switch operating mechanism has the advantages that the service life of the three-position switch operating mechanism and the three-position switch is prolonged, and the stability of a product is improved.
When the grounding switch is partially opened, the mechanism input shaft 20 rotates in a first direction (i.e., clockwise direction) to drive the rocker plate 11 to rotate, and simultaneously drives the grounding contact 12 and the movable contact 14 of the rocker plate 11 to move in the opening direction, i.e., the grounding contact 12 randomly rotates the input shaft 20 clockwise, and the movable contact 14 moves counterclockwise around the first end 141 thereof.
Because the moving contact 14 and the grounding contact 12 are driven to rotate by the same mechanism input shaft 20, the grounding switch part can be in an open state when the moving contact 14 and the isolation static contact 16 are switched on, and the isolation switch part is in an open state when the moving contact 14 and the grounding contact 12 are switched on, so that live grounding is effectively prevented.
The movable contact 14 and the grounding contact 12 respectively move in opposite directions during switching on and switching off, and here, the opposite directions refer to: the ground contact 12 and the movable contact 14 move in opposite directions about their respective axes of rotation, e.g., if the ground contact 12 moves clockwise about the mechanism input shaft 20, the movable contact 14 moves counterclockwise about its first end 141; if the grounding contact 12 moves counterclockwise around the mechanism input shaft 20, the movable contact 14 moves clockwise around the first end 141 thereof, and thus, the grounding contact 12 and the movable contact 14 move relative to or away from each other.
In conclusion, the grounding contact and the moving contact of the three-station switch disclosed by the invention are driven to rotate through the same mechanism input shaft, and the grounding contact and the moving contact are driven to move in opposite directions, so that the closing speed of the moving contact and the grounding contact can be accelerated under the condition of meeting the interlocking requirement of the switch equipment, the arc burning time is effectively reduced, and the contact ablation is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the scope of the present disclosure, but rather is intended to cover all equivalent structural changes made by applying the teachings of the present disclosure to the accompanying drawings.
Claims (10)
1. The utility model provides a three-station switch, its characterized in that is applied to the looped netowrk cabinet, includes:
the mechanism input shaft can be connected with the three-station operating mechanism and is driven by the three-station operating mechanism to rotate; and
at least one switch unit, each switch unit comprising:
the crank arm plate is fixedly connected with the mechanism input shaft and can rotate along with the rotation of the mechanism input shaft, and the crank arm plate is provided with a first end and a second end;
a ground contact connected to a first end of the throw arm plate;
one end of the insulating connecting plate is connected with the second end of the crank arm plate;
the movable contact is movably connected with the other end of the insulation connecting plate, the first end of the movable contact is movably connected with a movable contact seat, the movable contact seat can be fixed on a fixed frame, the fixed frame is fixed on the inner wall of the gas tank of the ring main unit, the second end of the movable contact is a free end, and a connection point of the movable contact and the insulation connecting plate is positioned between the first end of the movable contact and the second end of the movable contact;
when the mechanism input shaft rotates towards the grounding closing direction, the moving contact and the grounding contact move relatively and both move towards the closing direction.
2. The three position switch of claim 1, wherein the first end of the toggle plate has an area greater than the area of the second end.
3. The three position switch of claim 2, wherein the area of the toggle arm plate decreases from the first end to the second end.
4. The three-position switch of claim 1, wherein the distance from the connection point of the toggle plate and the ground contact to the mechanism input shaft is less than the distance from the connection point of the toggle plate and the insulating connection plate to the mechanism input shaft;
the pin shaft at the joint of the crank arm plate and the insulating connecting plate and the mechanism input shaft are in the same straight line, and the connection point of the first end of the crank arm plate and the grounding contact deviates from the straight line.
5. The three-position switch according to claim 1, wherein the switch unit further comprises an isolation stationary contact fixed on an isolation contact base, the isolation contact base can be fixed on the fixed frame, and the second end of the movable contact can be electrically connected with the grounding contact or the isolation stationary contact under the driving of the mechanism input shaft;
when the three-station switch is used for grounding and opening, the mechanism input shaft rotates towards a first direction, the first end of the crank arm plate drives the grounding contact to rotate towards the first direction, and the second end of the crank arm plate drives the movable contact to rotate towards a second direction opposite to the first direction through the insulating connecting plate, so that the grounding contact and the movable contact simultaneously move towards the opening direction;
when the three-station switch is grounded and switched on, the mechanism input shaft rotates towards the second direction, the first end of the turning arm plate drives the grounding contact to rotate towards the second direction, and the second end of the turning arm plate drives the moving contact to rotate towards the first direction through the insulating connecting plate, so that the moving contact and the grounding contact simultaneously move towards the switching-on direction.
6. The three-position switch of claim 5, wherein the stationary isolation contact is located on a path of the movable contact rotating in a first direction, and the ground contact is located on a path of the movable contact rotating in a second direction.
7. The three-position switch according to claim 1, wherein the moving contact and the insulating connecting plate are both in the form of a long strip, and a connection point of the moving contact and the insulating connecting plate is located at a middle position of the moving contact.
8. The three-position switch according to claim 1, further comprising a grounding busbar, wherein the grounding busbar is connected with the shell of the ring main unit through a flexible connection;
the ground contact is connected to the ground strap.
9. The three-position switch according to claim 8, wherein the three-position switch is applied to a three-phase current switch device, one switch unit is correspondingly arranged on each phase of current, and the crank arm plate of each switch unit is arranged on the mechanism input shaft at intervals;
the ground contact of each switch unit is connected to the ground bus.
10. A ring main unit, which is characterized by comprising an air box, a three-position switch according to any one of claims 1-9 arranged in the air box, and a three-position operating mechanism arranged in a mechanism chamber;
a fixed frame is arranged on the inner wall of the gas box, a moving contact seat of the three-position switch is fixed on the fixed frame, and insulating gas is filled in the gas box;
the three-station operating mechanism is connected with a mechanism input shaft of the three-station switch and can drive the mechanism input shaft to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120443630.1U CN214227362U (en) | 2021-03-01 | 2021-03-01 | Ring main unit and three-position switch thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120443630.1U CN214227362U (en) | 2021-03-01 | 2021-03-01 | Ring main unit and three-position switch thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214227362U true CN214227362U (en) | 2021-09-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120443630.1U Active CN214227362U (en) | 2021-03-01 | 2021-03-01 | Ring main unit and three-position switch thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214227362U (en) |
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2021
- 2021-03-01 CN CN202120443630.1U patent/CN214227362U/en active Active
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