CN206602086U - A kind of breaker and circuit protection device - Google Patents
A kind of breaker and circuit protection device Download PDFInfo
- Publication number
- CN206602086U CN206602086U CN201720376229.4U CN201720376229U CN206602086U CN 206602086 U CN206602086 U CN 206602086U CN 201720376229 U CN201720376229 U CN 201720376229U CN 206602086 U CN206602086 U CN 206602086U
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- feeler lever
- contact
- connecting portion
- breaker
- rotational axis
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Abstract
The utility model provides a kind of breaker and circuit protection device, belongs to technical field of electric appliances.The breaker includes housing, drive device, trip gear and feeler lever mechanism, housing has the first contact, trip gear includes dropout body, dropout body is rotatablely connected with housing, dropout body has the first abutting part, drive device is used to drive dropout body to rotate, and feeler lever mechanism includes drivening piece and feeler lever part.By the relation that is linked of dropout body, drivening piece and feeler lever part, when realizing disjunction, there is larger spacing between two contacts, contact position is not allowed easily to extinguish after being also easy to produce electric arc, or generation, and overall using effect is preferable.The circuit protection device includes breaker, and it has the repertoire of the breaker.
Description
Technical field
The utility model is related to technical field of electric appliances, in particular to a kind of breaker and circuit protection device.
Background technology
Breaker：Can turn on, carry and disjunction normal circuit under the conditions of electric current, also can be in defined improper circuit
Under the conditions of connect, carrying certain time and breaking current a kind of mechanical switch electrical equipment.
Miniature circuit breaker, abbreviation MCB (Micro Circuit Breaker), is during architectural electricity terminal power distribution draws
A kind of most popular terminal protection electrical equipment.Single-phase, three-phase short circuit, overload, overvoltage for below 125A etc. are protected, bag
Include four kinds of monopole 1P, two pole 2P, three pole 3P, quadrupole 4P etc..
Inventor has found that traditional breaker at least has the following disadvantages under study for action：
Electric arc is easily produced at contact, and is difficult to extinguish；
Using effect is poor.
Utility model content
The purpose of this utility model is the provision of a kind of breaker, improves the deficiencies in the prior art, it can pass through band
Moving part band movable feeler lever part is rotated, and is made feeler lever part closer or far from the first contact, the function of combined floodgate or separating brake is realized, by threading off this
The relation that is linked of body, drivening piece and feeler lever part, when realizing disjunction, has larger spacing, contact position between two contacts
Do not allow easily to extinguish after being also easy to produce electric arc, or generation, overall using effect is preferable.Its is reasonable in design, and market application potential is huge.
Another object of the present utility model is the provision of a kind of circuit protection device, and it includes open circuit mentioned above
Device, it has the repertoire of the breaker.
What embodiment of the present utility model was realized in：
Embodiment of the present utility model provides a kind of breaker, and it includes housing, drive device, trip gear and feeler lever
Mechanism, housing has the first contact, and trip gear includes dropout body, and dropout body is rotatablely connected with housing, threads off this
Body has the first abutting part, and drive device is used to drive dropout body to rotate, and feeler lever mechanism includes drivening piece and feeler lever part, drives
Part is rotatablely connected with housing around the first rotational axis line, and drivening piece has the second abutting part for being used for abutting the first abutting part
With the first connecting portion for being connected with feeler lever part, feeler lever part have be used for the second contact of the first contact and for
The second connecting portion that first connecting portion coordinates, feeler lever part is rotatablely connected with housing, drivening piece energy around the second rotational axis line
Enough band movable feeler lever parts rotate and make the second contact closer or far from the first contact.
Specifically, the breaker can be rotated by drivening piece band movable feeler lever part, feeler lever part is set to be touched closer or far from first
Point, realizes the function of combined floodgate or separating brake, by the relation that is linked of dropout body, drivening piece and feeler lever part, when realizing disjunction,
There is larger spacing, contact position is not allowed easily to extinguish after being also easy to produce electric arc, or generation, overall using effect between two contacts
Preferably.Its is reasonable in design, and market application potential is huge.
Optionally, feeler lever mechanism also includes return unit, and return unit makes the second contact that there is the motion close to the first contact to become
Gesture.
Optionally, the second abutting part relative to first connecting portion close to the first rotational axis line.
Optionally, second connecting portion relative to the second contact close to the second rotational axis line.
Optionally, first connecting portion is located at the both sides of the first rotational axis line, second connecting portion with the second abutting part respectively
It is located at the both sides of the second rotational axis line respectively with the second contact.
Optionally, first connecting portion and the second abutting portion be in the homonymy of the first rotational axis line, second connecting portion and the
Two contacts are located at the homonymy of the second rotational axis line.
Optionally, second connecting portion is provided with sliding groove, and first connecting portion is provided with sliding shoe, and sliding shoe rotatably connects
First connecting portion is connected to, sliding shoe is slidably embedded in sliding groove, sliding groove is on the direction of the radius of gyration of feeler lever part
Extension.
Optionally, second connecting portion is provided with slotted hole, and first connecting portion is provided with sliding bar, and sliding bar is slidably worn
In slotted hole, slotted hole is upwardly extended in the side of the radius of gyration of feeler lever part.
Optionally, feeler lever part includes the clamping part for being used to clamp contact, and contact is removably connected to clamping part, clamping part
Tilted relative to feeler lever part, the second contact is located on contact.
Embodiment of the present utility model additionally provides a kind of circuit protection device, and it includes breaker mentioned above, its
Repertoire with breaker.
Compared with prior art, the beneficial effect of the utility model embodiment is：
In summary, the breaker can be rotated by drivening piece band movable feeler lever part, make feeler lever part closer or far from first
Contact, realizes the function of combined floodgate or separating brake, by the relation that is linked of dropout body, drivening piece and feeler lever part, realizes disjunction
When, there is larger spacing, electric arc is not allowed to be also easy to produce in contact position between two contacts, or easily extinguish after producing, integrally use
Effect is preferable.Its is reasonable in design, and market application potential is huge.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, it will use below required in embodiment
Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram under the first visual angle for the breaker that the utility model embodiment 1 is provided；
Fig. 2 is the schematic diagram under second of visual angle of the breaker that the utility model embodiment 1 is provided；
Fig. 3 is the schematic diagram of the first feeler lever mechanism shown in Fig. 1；
Fig. 4 is the schematic diagram for second of feeler lever mechanism that the utility model embodiment 2 is provided.
Icon：100- breakers；101- housings；10- drive devices；11- spanners；12- driving members；20- trip gears；
21- dropout bodies；22- back-moving springs；23- dropout parts；24- fine motion parts；The abutting parts of 25- first；30- feeler levers mechanism；31- drives
Part；The abutting parts of 311- second；The rotational axis lines of 312- first；313- first connecting portions；32- feeler lever parts；321- second connecting portions；
The rotational axis lines of 322- second；323- clamping parts；324- contacts；The contacts of 325- second；33- return units；The contacts of 40- first；50-
Sensor；60- electromagnetic mechanisms.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit requirement
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
, it is necessary to which explanation, term " on ", " under ", "left", "right", " interior " etc. are indicated in description of the present utility model
Orientation or position relationship be that, based on orientation shown in the drawings or position relationship, or the utility model product is usual when using
The orientation or position relationship put, are for only for ease of description the utility model and simplify description, rather than indicate or imply institute
The device or element of finger must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this reality
With new limitation.In addition, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying phase
To importance.
In description of the present utility model, in addition it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set
Put ", " installation ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Embodiment 1
Refer to Fig. 1 and Fig. 2, present embodiments provide a kind of breaker 100, it include housing 101, drive device 10,
Trip gear 20 and feeler lever mechanism 30, housing 101 have the first contact 40, and trip gear 20 includes dropout body 21, threads off this
Body 21 is rotatablely connected with housing 101, and dropout body 21 has the first abutting part 25, and drive device 10, which is used to drive, threads off this
Body 21 is rotated, and feeler lever mechanism 30 includes drivening piece 31 and feeler lever part 32.
The overall structure of breaker 100 includes drive device 10, trip gear 20, feeler lever mechanism 30, sensor 50 and electricity
Magnetic mechanism 60, above-mentioned structure is all connected to housing 101.
Drive device 10 includes spanner 11 and driving member 12, and trip gear 20 includes dropout body 21, back-moving spring 22, taken off
Fastener 23 and fine motion part 24.Spanner 11 and dropout body 21 are connected by driving member 12, spanner 11, driving member 12, dropout body
21 and housing 101 constitute four-bar mechanism.When spanner 11 is rotated, driving member 12 is driven, dropout body 21 is rotated.
Dropout part 23 is fixedly connected or is integrally formed with dropout body 21, and fine motion part 24 is rotatablely connected with dropout body
21, in making process, fine motion part 24 abuts dropout part 23 all the time.When needing disjunction, fine motion part 24 is de- relative to dropout part 23
From being also associated with back-moving spring 22 between dropout body 21 and housing 101, in the presence of back-moving spring 22, realize separating brake.
In order that those skilled in the art can be better understood from the present embodiment, Fig. 2 hiding fine motion part 24.
Specific principle is that after spanner 11 closes a floodgate, the first contact 40 is contacted with feeler lever part 32, and fine motion part 24 abuts electromagnetism
Mechanism 60, sensor 50 is used to detect by electric current, when reaching that electromagnetic mechanism 60 promotes fine motion part 24, makes micro- when needing disjunction
Moving part 24 is rotated relative to dropout body 21, until departing from relative to dropout part 23, work of the dropout body 21 in back-moving spring 22
Resetted, and resetted with wrench 11 with lower.During reset, feeler lever part 32 finally realizes disjunction away from the first contact 40
Function.
Fig. 3 is refer to, and combines Fig. 1 and Fig. 2, drivening piece 31 is rotatablely connected with shell around the first rotational axis line 312
Body 101, drivening piece 31 have the second abutting part 311 for being used for abutting the first abutting part 25 and for be connected with feeler lever part 32 the
One connecting portion 313, feeler lever part 32 has the second contact 325 for being used for contacting with the first contact 40 and is used for and first connecting portion
313 second connecting portions 321 coordinated, feeler lever part 32 is rotatablely connected with housing 101 around the second rotational axis line 322, drives
Part 31 can rotate with movable feeler lever part 32 and make the second contact 325 closer or far from the first contact 40.
Explanation is needed exist for, drivening piece 31 realizes rotatable connection, the first rotary shaft by rotating shaft and housing 101
Heart line 312 is located in the rotating shaft.Feeler lever part 32 is also to realize rotatable connection, second by another rotating shaft and housing 101
Rotational axis line 322 is located in another rotating shaft.
Specifically, the breaker 100 can be rotated by drivening piece 31 with movable feeler lever part 32, make feeler lever part 32 close or remote
From the first contact 40, the function of combined floodgate or separating brake is realized, passes through being linked for dropout body 21, drivening piece 31 and feeler lever part 32
Relation, when realizing disjunction, has larger spacing, contact position is not allowed to be also easy to produce after electric arc, or generation easily between two contacts
Extinguish, overall using effect is preferable.Its is reasonable in design, and market application potential is huge.
Optionally, feeler lever mechanism 30 also includes return unit 33, and return unit 33 makes the second contact 325 have close to the first contact
40 movement tendency.
Return unit 33 includes spring, elastic drag rope, shell fragment.
It is described with the relative position in Fig. 3, is the view after the separating brake of breaker 100 shown in Fig. 3.Reset
Part 33 is located at the right side of drivening piece 31 or feeler lever part 32.
The return unit 33 can be connected with drivening piece 31, one end being connected with drivening piece 31 of return unit 33 and the first connection
Portion 313 is located at the both sides of the first rotational axis line 312 respectively, now, and the return unit 33 is in compressive state.
Similarly, the return unit 33 can be connected with drivening piece 31, one end being connected with drivening piece 31 of return unit 33 and
One connecting portion 313 is located at the homonymy of the first rotational axis line 312, now, and the return unit 33 is in extended state.
Similarly, the return unit 33 can also be connected with feeler lever part 32, one end being connected with feeler lever part 32 of return unit 33 and
Second connecting portion 321 is located at the homonymy of the second rotational axis line 322, now, and the return unit 33 is in extended state.
Similarly, the return unit 33 can also be connected with feeler lever part 32, one end being connected with feeler lever part 32 of return unit 33 and
Second connecting portion 321 is located at the both sides of the second rotational axis line 322 respectively, now, and the return unit 33 is in compressive state.
Similarly, the return unit 33 may be located on the left side of drivening piece 31 or feeler lever part 32.Also preferably effect can be played.
Acted on by the restoring force of return unit 33, can make the second contact 325 that there is the motion close to the first contact 40 to become
Gesture.During combined floodgate, the first abutting part 25 is under the drive of dropout body 21, gradually with remote second abutting part 311
Movement tendency, drivening piece 31 or feeler lever part 32 make the second contact 325 close to the first contact in the presence of return unit 33, gradually
40, final realize is closed a floodgate.
Optionally, the second abutting part 311 relative to first connecting portion 313 close to the first rotational axis line 312.
According to arc length calculation formula：L=α (radian) × r (radius), when the second abutting part 311 rotates identical angle,
The position more remote relative to the first rotational axis line 312, the arc length of rotation is longer.That is, it is only necessary to the first abutting part 25
Less angle is rotated, just can realize that first connecting portion 313 rotates larger arc length relative to the first rotational axis line 312.Most
Realize that the first abutting part 25 need to rotate less angle eventually, realize and deposited after disjunction between the first contact 40 and the second contact 325
In larger spacing.
Optionally, second connecting portion 321 relative to the second contact 325 close to the second rotational axis line 322.
Principle and mentioned above identical, it is only necessary to second connecting portion 321 relative to the second rotational axis line 322 rotate compared with
Small angle, just can realize that the second contact 325 rotates larger arc length relative to the second rotational axis line 322.Final realize is divided
Have no progeny, there is larger spacing between the first contact 40 and the second contact 325.
Optionally, the abutting part 311 of first connecting portion 313 and second is located at the both sides of the first rotational axis line 312 respectively, the
Two connecting portions 321 and the second contact 325 are located at the both sides of the second rotational axis line 322 respectively.
Acted on by the linkage of drivening piece 31 and feeler lever part 32, finally realize the rotation direction and feeler lever part of dropout body 21
32 rotation direction is identical.That is when dropout body 21 is rotated counterclockwise, it can realize that feeler lever part 32 also turns counterclockwise
It is dynamic.
In mechanical field, to realize that an object had not only been rotated but also the mechanism of translation has a lot, use in the present embodiment
Slider-crank mechanism or slider-rocker mechanism.
Optionally, second connecting portion 321 is provided with sliding groove, and first connecting portion 313 is provided with sliding shoe, and sliding shoe can turn
Dynamic is connected to first connecting portion 313, and sliding shoe is slidably embedded in sliding groove, rotation half of the sliding groove in feeler lever part 32
The side in footpath is upwardly extended.
Pass through the design of sliding shoe, it is ensured that when drivening piece 31 is rotated, can realize that band movable feeler lever part 32 is also rotated together.
Need exist for explanation, can also be set between the first connecting portion 313 and second connecting portion 321 connecting rope or
Connects chain, can also realize when drivening piece 31 is rotated, can be rotated with movable feeler lever part 32.
Optionally, second connecting portion 321 is provided with slotted hole, and first connecting portion 313 is provided with sliding bar, and sliding bar can be slided
Dynamic is arranged in slotted hole, and slotted hole is upwardly extended in the side of the radius of gyration of feeler lever part 32.
Principle is identical with above-mentioned principle.
Optionally, feeler lever part 32 includes the clamping part 323 for being used to clamp contact 324, and contact 324 is removably connected to folder
Portion 323 is held, clamping part 323 is tilted relative to feeler lever part 32, the second contact 325 is located on contact 324.
Contact 324 it is detachable, make its installation and maintenance just more facilitate.
Inclined design, after disjunction, the contact 324 is not that, towards the first contact 40, can avoid the production of electric arc
It is raw, or the electric arc of generation is quickly extinguished.
According to a kind of breaker 100 of the utility model embodiment offer, the operation principle of breaker 100 is：
By the relation that is linked of dropout body 21, drivening piece 31 and feeler lever part 32, realize dropout body 21 rotate compared with
During small angle, feeler lever part 32 can rotate larger angle, and the second contact 325 can rotate larger arc length.After disjunction, the
There is larger spacing between one contact 40 and the second contact 325, the generation of electric arc can be avoided, or make the electric arc of generation fast
Speed is extinguished.
Embodiment 2
Fig. 4 is refer to, the present embodiment also provides a kind of breaker 100, and the technical scheme that embodiment 1 is described is equally applicable
In the present embodiment, description is not repeated in the published technical scheme of embodiment 1.
Specifically, the present embodiment and the difference of embodiment 1 are, the abutting part 311 of first connecting portion 313 and second is located at the
The homonymy of one rotational axis line 312, the contact 325 of second connecting portion 321 and second is located at the homonymy of the second rotational axis line 322.
By the design of homonymy, it can also realize that dropout body 21 is identical with the rotation direction of feeler lever part 32.Entirety is used
Effect is preferable.
Embodiment 3
The present embodiment also provides a kind of circuit protection device, and it includes breaker 100 mentioned above, breaker 100
Structure may be referred to embodiment 1 or 2, the circuit protection device have breaker 100 institute it is functional.
General circuit protection device often sets multiple breakers 100 to carry out operation, it is ensured that the normal work of circuit.
In summary, the utility model provides a kind of breaker 100, and the breaker 100 can pass through the band of drivening piece 31
Movable feeler lever part 32 is rotated, and is made feeler lever part 32 closer or far from the first contact 40, the function of combined floodgate or separating brake is realized, by threading off this
The relation that is linked of body 21, drivening piece 31 and feeler lever part 32, when realizing disjunction, has larger spacing between two contacts,
Contact position is not allowed easily to extinguish after being also easy to produce electric arc, or generation, and overall using effect is preferable.Its is reasonable in design, and market application is latent
Power is huge.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of breaker, it is characterised in that including housing, drive device, trip gear and feeler lever mechanism；
The housing has the first contact；
The trip gear includes dropout body, and the dropout body is rotatablely connected with the housing；
The dropout body has the first abutting part；
The drive device is used to drive the dropout body to rotate；
The feeler lever mechanism includes drivening piece and feeler lever part, and the drivening piece is rotatablely connected with institute around the first rotational axis line
Housing is stated, the drivening piece, which has, to be used to abut the second abutting part of first abutting part and for being connected with the feeler lever part
First connecting portion；
The feeler lever part, which has, to be used for the second contact of first contact and for coordinating with the first connecting portion
Second connecting portion, the feeler lever part is rotatablely connected with the housing around the second rotational axis line, and the drivening piece can
The feeler lever part is driven to rotate and make second contact closer or far from first contact.
2. breaker according to claim 1, it is characterised in that the feeler lever mechanism also includes return unit, the reset
Part makes second contact have the movement tendency close to first contact.
3. breaker according to claim 1, it is characterised in that second abutting part is relative to the first connecting portion
Close to first rotational axis line.
4. breaker according to claim 1, it is characterised in that the second connecting portion is leaned on relative to second contact
Nearly second rotational axis line.
5. the breaker according to claim any one of 1-4, it is characterised in that the first connecting portion is supported with described second
Socket part is located at the both sides of first rotational axis line respectively, and the second connecting portion is located at described respectively with second contact
The both sides of second rotational axis line.
6. the breaker according to claim any one of 1-4, it is characterised in that the first connecting portion is supported with described second
Socket part is located at the homonymy of first rotational axis line, and the second connecting portion is located at described second with second contact and rotated
The homonymy of axial line.
7. the breaker according to claim any one of 1-4, it is characterised in that the second connecting portion is provided with slip
Groove, the first connecting portion is provided with sliding shoe, and the sliding shoe is rotatablely connected with the first connecting portion, the slip
Block is slidably embedded in the sliding groove, and the sliding groove is upwardly extended in the side of the radius of gyration of the feeler lever part.
8. the breaker according to claim any one of 1-4, it is characterised in that the second connecting portion is provided with oval
Hole, the first connecting portion is provided with sliding bar, and the sliding bar is slidably arranged in the slotted hole, the slotted hole
Upwardly extended in the side of the radius of gyration of the feeler lever part.
9. the breaker according to claim any one of 1-4, it is characterised in that the feeler lever part includes being used to clamp contact
Clamping part, the contact is removably connected to the clamping part, and the clamping part is tilted relative to the feeler lever part, described
Second contact is located on the contact.
10. a kind of circuit protection device, it is characterised in that including the breaker described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720376229.4U CN206602086U (en) | 2017-04-11 | 2017-04-11 | A kind of breaker and circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720376229.4U CN206602086U (en) | 2017-04-11 | 2017-04-11 | A kind of breaker and circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206602086U true CN206602086U (en) | 2017-10-31 |
Family
ID=60143883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720376229.4U Active CN206602086U (en) | 2017-04-11 | 2017-04-11 | A kind of breaker and circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206602086U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108573837A (en) * | 2018-07-26 | 2018-09-25 | 厦门大恒科技有限公司 | A kind of Wound-rotor type memorial alloy reclosing |
| CN109545634A (en) * | 2019-01-09 | 2019-03-29 | 厦门大恒科技有限公司 | A kind of rotary contact mechanism and breaker |
-
2017
- 2017-04-11 CN CN201720376229.4U patent/CN206602086U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108573837A (en) * | 2018-07-26 | 2018-09-25 | 厦门大恒科技有限公司 | A kind of Wound-rotor type memorial alloy reclosing |
| CN108573837B (en) * | 2018-07-26 | 2024-03-19 | 厦门大恒科技有限公司 | Wound-type memory alloy reclosing valve |
| CN109545634A (en) * | 2019-01-09 | 2019-03-29 | 厦门大恒科技有限公司 | A kind of rotary contact mechanism and breaker |
| CN109545634B (en) * | 2019-01-09 | 2024-05-28 | 厦门大恒科技有限公司 | Rotary contact mechanism and circuit breaker |
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