CN111785591A - Switching-on/off handle mechanism and plug-in circuit breaker - Google Patents
Switching-on/off handle mechanism and plug-in circuit breaker Download PDFInfo
- Publication number
- CN111785591A CN111785591A CN202010726893.3A CN202010726893A CN111785591A CN 111785591 A CN111785591 A CN 111785591A CN 202010726893 A CN202010726893 A CN 202010726893A CN 111785591 A CN111785591 A CN 111785591A
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- circuit breaker
- plug
- handle
- shaft hole
- rocker arm
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- 238000005452 bending Methods 0.000 claims abstract description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000003780 insertion Methods 0.000 abstract description 7
- 230000037431 insertion Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
- H01H71/521—Details concerning the lever handle
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0207—Mounting or assembling the different parts of the circuit breaker
- H01H71/0214—Housing or casing lateral walls containing guiding grooves or special mounting facilities
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1009—Interconnected mechanisms
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- Breakers (AREA)
Abstract
The invention relates to a switching-on/off handle mechanism and an insertion type circuit breaker, wherein the handle mechanism comprises a handle rocker arm and a connecting rod, the handle rocker arm is hinged on a shell of the insertion type circuit breaker through a rotating shaft, the handle rocker arm is connected with an operating mechanism in the insertion type circuit breaker through the connecting rod, a first long shaft hole and a second long shaft hole are formed in the handle rocker arm, the rotating shaft is installed in the first long shaft hole, a connecting end of the connecting rod penetrates into the second long shaft hole, a bent part is formed in the connecting end, a braking part is arranged on the side wall of one side of the handle rocker arm, and the bent part of the connecting end is positioned on the side wall with the braking part. Compared with the prior art, the invention ensures that the bending part rotates at the braking part without interference in the opening and closing processes of the plug-in circuit breaker; after the switch is switched on, the bending part and the braking part mutually form limit, so that the arm rocker is fixed and static, and the stability of the arm rocker after the switch is switched on is ensured.
Description
Technical Field
The invention relates to the field of plug-in circuit breakers, in particular to a switching-on/off handle mechanism and a plug-in circuit breaker.
Background
In recent years, plug-in circuit breakers are more and more widely used, and particularly, with the rapid development of the 5G industry, 5G cabinets have more and more requirements, and plug-in circuit breakers used in cooperation with the 5G cabinets are more and more valued by manufacturers.
Chinese patent application publication No. CN 107993900 a discloses a plug-in type miniature circuit breaker. The invention is applied to the most common commercial plug-in circuit breaker. The plug-in circuit breaker adopts a button type structure, and when the button is pressed, the circuit breaker is switched on; when the button is pulled out, the breaker is opened. But this structure easily takes place the maloperation problem that the circuit breaker breaks away from the rack when opening.
In order to solve the above problems, the chinese patent application No. 202010287069.2 provides a switching handle mechanism of a plug-in circuit breaker, which controls switching on and off by rotating a handle rocker arm, and operates a locking member by linear movement. However, this structure has the following disadvantages: the handle rocker arm is moved linearly through two elongated shaft holes parallel to each other to operate the locking member, however, the two elongated shaft holes are easily loosened when rotated. The method specifically comprises the following steps: when the handle rocker rotates along one end of one long-strip shaft hole, a certain movable gap is formed between the connecting rod and the handle rocker because the connecting rod is connected with the handle rocker through the other long-strip shaft hole. After the handle rocker arm drives the connecting rod to rotate, the handle rocker arm can be easily shifted in a reverse small gap mode, so that the self positioning control of the handle rocker arm is unstable, the user use trouble is caused, and even the switch-on and switch-off of the circuit breaker is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a switching-on/off handle mechanism and an insertion type circuit breaker, so that the stability of self-positioning control of a handle rocker arm is improved.
The purpose of the invention can be realized by the following technical scheme:
a switching-off and switching-on handle mechanism of an insertion type circuit breaker comprises a handle rocker arm and a connecting rod, wherein the handle rocker arm is hinged to a shell of the insertion type circuit breaker through a rotating shaft, the handle rocker arm is connected with an operating mechanism in the insertion type circuit breaker through the connecting rod, a first strip shaft hole and a second strip shaft hole are formed in the handle rocker arm, the rotating shaft is installed in the first strip shaft hole, a connecting end of the connecting rod penetrates into the second strip shaft hole, a bent part is arranged on the connecting end, a braking part is arranged on one side wall of the handle rocker arm, and after the connecting end penetrates through the second strip shaft hole, the bent part is positioned on a side wall with the;
when the plug-in circuit breaker is switched on, the axis of the bending part and the long central line of the second long shaft hole mutually form an included angle larger than a first set angle, so that the bending part is abutted against the braking part, and the connecting rod and the handle rocker arm mutually form position limitation;
when plug-in circuit breaker separating brake, the axis of kink and the long central line in the rectangular shaft hole of second form the contained angle that is less than the second and sets for the link can slide in the rectangular shaft hole of second.
Furthermore, the braking part is a limiting lug arranged on the side wall of the rocker arm of the handle, and the limiting lug is used for contacting the bent part.
Further, the braking portion include spacing lug and the groove of stepping down, the groove of stepping down is the axial extension in the rectangular shaft hole of second, spacing lug sets up the one end in the groove of stepping down, after the link passed the rectangular shaft hole of second, its kink was located the groove of stepping down.
Furthermore, the abdicating groove is a fan-shaped groove, and one side of the fan-shaped groove is collinear with one long side of the second strip shaft hole.
Furthermore, the first setting angle is 60-80 degrees, and the second setting angle is 0-20 degrees.
Furthermore, on the handle rocker arm, a reinforcing block is arranged on the side wall opposite to the braking part, and the reinforcing block is used for contacting the bending part of the connecting end and the connecting rod body in the connecting rod.
Further, the protruding direction of the handle part on the handle rocker arm is parallel to the extending direction of the first long shaft hole.
The handle rocker arm is provided with a locking part, and the locking part is used for locking and connecting the plug-in circuit breaker and the cabinet; when the handle rocker arm is pulled outwards of the cabinet, the first strip-shaped shaft hole and the rotating shaft slide relatively, the locking part drives the locking piece to unlock, and the plug-in circuit breaker is separated from the cabinet.
Further, the locking member is hinged in the housing through a locking shaft and a spring member, the locking member includes a linking portion and a boss portion, the boss portion protrudes from an opening of the housing of the plug-in type circuit breaker, and the linking portion is used for contacting the locking portion.
A plug-in circuit breaker is provided with the switching-on/off handle mechanism.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the connecting rod is provided with the bending part, the handle rocker arm is provided with the braking part matched with the connecting rod, and through the matching of the structures, the bending part rotates at the braking part without interference in the opening and closing process of the plug-in circuit breaker (the handle rocker arm rotates clockwise/anticlockwise along one end of the first long shaft hole); after the switch is switched on, the bending part and the braking part mutually form limit, so that the arm rocker is fixed and static, and the stability of the arm rocker after the switch is switched on is ensured.
2. The braking part can be directly a limiting lug, and the brake device is simple in structure, easy to realize and good in popularization; the braking part can also adopt a matching structure of the limiting convex block and the yielding groove, the yielding groove can form a hiding and protecting effect on the bending part, and meanwhile, the space-saving structure is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of the first embodiment.
Fig. 2 is a schematic structural view of the connecting rod.
Fig. 3 is a sectional structural schematic view of the handle rocker arm.
Fig. 4 is a schematic view of a handle rocker arm structure.
Fig. 5 is a structural schematic diagram of a closing state in the first embodiment.
Fig. 6 is a schematic structural diagram of the first embodiment in the open state.
Fig. 7 is a structural schematic diagram of a disassembled state in the first embodiment.
Fig. 8 is a schematic structural diagram of the second embodiment.
Fig. 9 is a structural schematic diagram of a closing state in the second embodiment.
Fig. 10 is a structural diagram of the second embodiment in the open state.
Fig. 11 is a structural diagram illustrating a disassembled state in the second embodiment.
Reference numerals: 1. the handle rocker arm 11, first rectangular shaft hole, 12, second rectangular shaft hole, 13, spacing lug, 14, abdicating groove, 15, locking portion, 16, reinforcing block, 2, connecting rod, 21, connecting end, 22, kink, 3, locking piece, 31, linkage portion, 32, boss portion, 33, locking axle, 34, spring part, 4, pivot.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example one
As shown in fig. 1 and 2, the present embodiment provides a switching-on/off handle mechanism of a plug-in circuit breaker, which is installed in a certain plug-in circuit breaker. The plug-in circuit breaker further comprises a shell and an operating mechanism. The switching-on and switching-off handle mechanism specifically comprises a handle rocker arm 1 and a connecting rod 2, wherein the handle rocker arm 1 is hinged on a shell of the plug-in circuit breaker through a rotating shaft 4. The connecting rod 2 is a rod piece with two bent ends, the right end of the connecting rod is bent to form a connecting end 21 and is used for being connected with the handle rocker arm 1, and the end part of the connecting end 21 is further provided with a bent part 22. The left end of the connecting rod 2 is connected with an operating mechanism in a bent mode, and the operating mechanism is driven to deform by stirring the handle rocker arm 1, so that the opening and closing states of the circuit breaker are changed.
As shown in fig. 1, 3 and 4, the handle swing arm 1 is provided with a first elongated shaft hole 11 and a second elongated shaft hole 12 which are parallel to each other. The side wall of one side of the handle rocker arm 1 is provided with a braking part, and after the connecting end 21 passes through the second long shaft hole 12, the bending part 22 is positioned on the side wall with the braking part. The braking portion in this embodiment includes a limiting protrusion 13 and a yielding groove 14, and the yielding groove 14 is an axial extension of the second elongated shaft hole 12. Specifically, the receding groove 14 is a sector groove, an upper side edge of the sector groove and an upper long side edge of the second elongated shaft hole 12 are collinear, and a lower side edge of the sector groove and a lower long side edge of the second elongated shaft hole 12 form the limit projection 13. On the handle rocker arm 1, a reinforcing block 16 is further arranged on the side wall opposite to the braking part, and the reinforcing block 16 is used for contacting the bending part of the connecting end 21 and the connecting rod 2 body in the connecting rod 2, so that the stability of the connecting rod 2 in rotation is improved. When the plug-in circuit breaker is switched on, the axis of the bending part 22 and the long central line of the second long shaft hole 12 mutually form an included angle larger than a first set angle, so that the bending part 22 abuts against the braking part to limit the position of the connecting end 21 in the second long shaft hole 12; when the plug-in circuit breaker is opened, the axis of the bending part 22 and the long central line of the second elongated shaft hole 12 mutually form an included angle smaller than a second set angle, so that the bending part 22 is away from the braking part by a distance, and the connecting end 21 of the connecting rod 2 can slide in the second elongated shaft hole 12. The first setting angle is generally 60 to 80 degrees, preferably 80 degrees in the embodiment. The second setting angle is generally 0 to 20 degrees, and preferably 10 degrees in the present embodiment. The handle swing arm 1 also has a handle portion protruding in a direction parallel to the extending direction of the first elongated shaft hole 11.
As shown in fig. 1, the present embodiment further includes a locking member 3, and the handle rocker arm 1 is further provided with a locking portion 15. The locking member 3 comprises an interlocking part 31 and a boss part 32 connected to each other, and the joint of the interlocking part 31 and the boss part 32 is hinged in the housing by a locking shaft 33 and a spring member 34. The locking member 3 is located at the upper rear of the handle rocker 1. The spring member 34 is typically a torsion spring or a tension and compression spring, and a torsion spring is used in this embodiment. The torsional spring nests in on locking axle 33, and one end fixed connection is on locking piece 3, and the other end is fixed on the inside wall of casing. An opening is provided at the top end of the housing, and the locking member 3 is normally under the action of the spring member 34 such that the boss portion 32 always protrudes from the housing through the opening and is fixed to the cabinet. When the plug-in circuit breaker is in the open state, the handle rocker arm 1 is rotated to a position such that the locking portion 15 contacts the interlocking portion 31 on the locking member 3 while the first elongated shaft hole 11 and the second elongated shaft hole 12 are both in a horizontal state. When the handle rocker arm 1 is pulled in the outward direction of the cabinet, the first elongated shaft hole 11 and the rotating shaft 4 slide relatively, the second elongated shaft hole 12 and the connecting end 21 of the connecting rod 2 slide relatively, the locking part 15 drives the linkage part 31 to move, so that the locking part 3 rotates around the locking shaft 33 against the restoring force of the spring part 34, and the boss part 32 retracts into the housing from the opening at the top end of the housing.
The working principle of the embodiment is as follows:
when the circuit breaker is normally switched on and off, the locking piece 3 enables the boss part 32 to always extend out of the shell from the opening under the action of the spring piece 34, and the circuit breaker is fixed with the cabinet. The rotating shaft 4 is located at the rightmost end of the first elongated shaft hole 11, and the connecting end 21 of the connecting rod 2 is also located at the rightmost end of the second elongated shaft hole 12. The handle rocker arm 1 rotates by taking the rightmost end of the first long shaft hole 11 as a circle center.
When the circuit breaker needs to be closed, the handle rocker 1 rotates along the rotating shaft 4 counterclockwise, so that the bent part 22 rotates clockwise in the abdicating groove 14 until abutting against the stop block 13, thereby locking the handle rocker 1 and the connecting rod 2 with each other, and no relative movement occurs.
As shown in fig. 6, when the circuit breaker needs to be opened, the handle rocker 1 rotates clockwise along the rotation shaft 4, so that the bent portion 22 rotates counterclockwise in the relief groove 14, the bent portion 22 is separated from the stop block 13, and thus the mutual locking of the link 2 and the handle rocker 1 is released, and the connecting end 21 can slide in the second elongated shaft hole 12.
As shown in fig. 7, when the circuit breaker needs to be disassembled, the handle rocker arm 1 of the circuit breaker is firstly shifted to an opening state. When the brake is off, the handle part of the handle rocker arm 1 is in a horizontal state with the first long shaft hole 11 and the second long shaft hole 12. The locking portion 15 and the interlocking portion 31 contact each other; the lever arm 1 is pulled outward, and at this time, the rotation shaft 4 moves to the leftmost end of the first elongated shaft hole 11, and the connection end 21 of the link 2 also moves to the leftmost end of the second elongated shaft hole 12 without interference with the stopper 13. Thereby, the locking portion 15 drives the interlocking portion 31 to move upward, specifically, the interlocking portion 31 slides along the inclined surface on the locking portion 15, the locking member 3 rotates around the locking shaft 33 against the restoring force of the spring member 34, and the boss portion 32 retracts into the housing from the opening at the top end of the housing. And then the handle rocker arm 1 is continuously pulled outwards, so that the whole circuit breaker can be conveniently pulled out of the cabinet.
Example two
As shown in fig. 8, the main differences between the present embodiment and the first embodiment are as follows: the braking part is only one limiting lug 13 in the embodiment, and the limiting lug 13 is arranged on the side wall of the handle rocker arm 1.
When the plug-in circuit breaker needs to be closed, the handle rocker 1 rotates clockwise along the rotating shaft 4, so that the bent part 22 rotates counterclockwise relative to the handle rocker 1 until the bent part abuts against the stop block 13, and therefore the handle rocker 1 and the connecting rod 2 are locked with each other and do not move relatively.
As shown in fig. 10, when the circuit breaker needs to be opened, the handle rocker 1 rotates counterclockwise along the rotation shaft 4, so that the bent portion 22 is separated from the stop block 13, thereby releasing the mutual limit between the link 2 and the handle rocker 1, and the connecting end 21 can slide in the second elongated shaft hole 12. At this time, as shown in fig. 11, the connecting end 21 is moved to the leftmost end of the second elongated shaft hole 12 by pulling the handle swing arm 1 in the outside direction of the cabinet, and the locking member (not shown) is unlocked without interfering with the connecting block 13.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A switching-on and switching-off handle mechanism of a plug-in circuit breaker comprises a handle rocker arm (1) and a connecting rod (2), the handle rocker arm (1) is hinged on the shell of the plug-in circuit breaker through a rotating shaft (4), and the handle rocker arm (1) is connected with an operating mechanism in the plug-in circuit breaker through a connecting rod (2), a first strip shaft hole (11) and a second strip shaft hole (12) are arranged on the handle rocker arm (1), the rotating shaft (4) is arranged in the first strip shaft hole (11), the connecting end (21) of the connecting rod (2) penetrates into the second strip shaft hole (12), it is characterized in that a bending part (22) is arranged on the connecting end (21), a braking part is arranged on the side wall of one side of the handle rocker arm (1), and after the connecting end (21) passes through the second long shaft hole (12), a bending part (22) of the connecting end is positioned on the side wall with the braking part;
when the plug-in circuit breaker is switched on, the axis of the bending part (22) and the long central line of the second long shaft hole (12) mutually form an included angle which is larger than a first set angle, so that the bending part (22) abuts against the braking part, and the connecting rod (2) and the handle rocker arm (1) mutually form a position limitation;
when the plug-in circuit breaker is opened, the axis of the bending part (22) and the long central line of the second strip shaft hole (12) mutually form an included angle smaller than a second set angle, so that the connecting end (21) can slide in the second strip shaft hole (12).
2. The switch-on/off handle mechanism of the plug-in circuit breaker according to claim 1, wherein the braking portion is a limit protrusion (13) disposed on a sidewall of the handle rocker (1), and the limit protrusion (13) is used for contacting the bending portion (22).
3. The switch-on/off handle mechanism of the plug-in circuit breaker according to claim 1, wherein the braking portion comprises a limiting protrusion (13) and a yielding groove (14), the yielding groove (14) is an axial extension of the second elongated shaft hole (12), the limiting protrusion (13) is disposed at one end of the yielding groove (14), and after the connecting end (21) passes through the second elongated shaft hole (12), the bending portion (22) of the connecting end is located in the yielding groove (14).
4. A switch-on/switch-off handle mechanism of a plug-in type circuit breaker according to claim 3, wherein said relief groove (14) is a fan-shaped groove, one side of which is collinear with one long side of the second elongated axial hole (12).
5. The switch-on/off handle mechanism of the plug-in circuit breaker according to claim 1, wherein the first setting angle is 60 to 80 degrees, and the second setting angle is 0 to 20 degrees.
6. The switch-on/off handle mechanism of the plug-in circuit breaker according to claim 1, characterized in that the handle rocker arm (1) is provided with a reinforcing block (16) on the side wall opposite to the braking part, and the reinforcing block (16) is used for contacting the connecting end (21) of the connecting rod (2) and the bending part of the connecting rod (2) body.
7. A switch-on/switch-off handle mechanism of a plug-in circuit breaker according to claim 1, characterized in that the direction of projection of the handle portion on the handle rocker (1) is parallel to the direction of extension of the first elongated axial hole (11).
8. The switching-closing handle mechanism of the plug-in circuit breaker according to claim 1, characterized in that, further comprises a locking piece (3), the handle rocker arm (1) is provided with a locking part (15), the locking piece (3) is used for locking and connecting the plug-in circuit breaker and the cabinet; when the handle rocker arm (1) is pulled outwards of the cabinet, the first long-strip shaft hole (11) and the rotating shaft (4) slide relatively, the locking part (15) drives the locking part (3) to unlock, and the plug-in circuit breaker is separated from the cabinet.
9. Switching-closing handle mechanism of plug-in circuit breaker according to claim 8, characterized in that said locking member (3) is hinged inside the housing by means of a locking shaft (33) and a spring member (34), the locking member (3) comprising a cooperating portion (31) and a boss portion (32), the boss portion (32) protruding from the opening of the housing of the plug-in circuit breaker, the cooperating portion (31) being intended to contact the locking portion (15).
10. A plug-in circuit breaker characterized in that the opening/closing handle mechanism according to any one of claims 1 to 9 is installed inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010726893.3A CN111785591B (en) | 2020-07-26 | 2020-07-26 | Switching-on and switching-off handle mechanism and plug-in circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010726893.3A CN111785591B (en) | 2020-07-26 | 2020-07-26 | Switching-on and switching-off handle mechanism and plug-in circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111785591A true CN111785591A (en) | 2020-10-16 |
| CN111785591B CN111785591B (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010726893.3A Active CN111785591B (en) | 2020-07-26 | 2020-07-26 | Switching-on and switching-off handle mechanism and plug-in circuit breaker |
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| Country | Link |
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| CN (1) | CN111785591B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105575737A (en) * | 2016-03-15 | 2016-05-11 | 佳一电气有限公司 | Circuit breaker operating mechanism and circuit breaker |
| CN210778452U (en) * | 2019-12-18 | 2020-06-16 | 浙江明晖智能电气有限公司 | Plug-in circuit breaker |
| CN212257323U (en) * | 2020-07-26 | 2020-12-29 | 德力西电气有限公司 | Switching-on/off handle mechanism and plug-in circuit breaker |
-
2020
- 2020-07-26 CN CN202010726893.3A patent/CN111785591B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105575737A (en) * | 2016-03-15 | 2016-05-11 | 佳一电气有限公司 | Circuit breaker operating mechanism and circuit breaker |
| CN210778452U (en) * | 2019-12-18 | 2020-06-16 | 浙江明晖智能电气有限公司 | Plug-in circuit breaker |
| CN212257323U (en) * | 2020-07-26 | 2020-12-29 | 德力西电气有限公司 | Switching-on/off handle mechanism and plug-in circuit breaker |
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| Publication number | Publication date |
|---|---|
| CN111785591B (en) | 2024-06-18 |
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