CN102436984B - Breaker rapid disjunction device - Google Patents
Breaker rapid disjunction device Download PDFInfo
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- CN102436984B CN102436984B CN201110441959.5A CN201110441959A CN102436984B CN 102436984 B CN102436984 B CN 102436984B CN 201110441959 A CN201110441959 A CN 201110441959A CN 102436984 B CN102436984 B CN 102436984B
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Abstract
The invention discloses a breaker rapid disjunction device. The device comprises a static contact mechanism and a moving contact mechanism which are arranged in a shell, wherein the static contact mechanism comprises a static contact and an electromagnetic driving mechanism; the moving contact mechanism comprises a handle mechanism, a main shaft, a moving contact support rotatably assembled on the main shaft, a moving contact rotatably assembled on a moving contact support through a moving contact rotor shaft, a jump button connected with the moving contact support and the handle mechanism, and a disconnection rod which is matched with the jump button and driven by the electromagnetic driving mechanism so as to force the jump button to disconnect; and the device is characterized in that the moving contact mechanism also comprises an appending drive rod which drives the disconnection rod to move so as to departure the jump button by the moving contact. The device provided by the invention can force the static contact and the moving contact to fully disconnect by only depend on the electromotive force repulsion generated by contacts in the response time of the electromagnetic driven mechanism, thereby overcoming the defects that the disjunction can not ensured in the first time and the contacts can not effectively protected caused by long disjunction time of the existing breaker.
Description
Technical field
the present invention relates to a kind of breaker rapid disjunction device.
Background technology
the static contact mechanism of at present traditional Shell of circuit breaker inside generally includes fixed contact and electromagnetic drive mechanism, described electromagnetic drive mechanism mainly comprises coil rack, be wrapped in solenoid on coil rack, be located at quiet, the moving iron core in solenoid and be fixed on moving iron core and the magnetic core push rod from passing in static iron core, between described quiet, moving iron core, is provided with stage clip.Described fixed contact is fixed on coil rack front end relative with moving contact, and fixed contact is provided with silver point.A whole set of interlinked mechanism that described dynamic contact mechanism is normally assembled up by some parts, it mainly comprises that handle mechanism, main shaft, rotation are assemblied in moving contact rack on main shaft, are articulated in the moving contact on moving contact rack, the tripping being connected with handle mechanism with moving contact rack, and the release lever that coordinates with tripping and can force by the driving of electromagnetic drive mechanism tripping to be threaded off.
described moving contact is assemblied on moving contact rack by moving contact rotating shaft rotation, described moving contact is sheathed on main shaft by mounting hole simultaneously, described main shaft is positioned at moving contact rotating shaft top, and between this moving contact and housing, be connected with moving contact reset tension spring, the tie point of described moving contact reset tension spring and moving contact is between main shaft and moving contact rotating shaft.Described release lever rotation is assemblied on main shaft, is equipped with release lever reduction torsion spring on described main shaft simultaneously, and described tripping is assemblied on moving contact rack by tripping rotating shaft rotation, and this tripping is provided with the hook part hook part overlap joint that be provided with corresponding to release lever top; Described handle mechanism comprises that the arm pivot post that is fixed in housing, rotation are assemblied in the switch lever on arm pivot post and connect the tripping drive rod of switch lever and tripping, are equipped with handle reduction torsion spring on described arm pivot post.
in theory; if there is the large electric current of abnormal failure in above-mentioned traditional circuit breaker when closing a floodgate energising; can flow through solenoid in electromagnetic drive mechanism magnetize stress moment that dynamic and static iron core makes both overcome stage clip and clap and close of large electric current; magnetic core push rod is ejected and promotes the stress that release lever overcomes release lever reduction torsion spring; force tripping to be threaded off; and then make the inner interlock that occurs of dynamic contact mechanism, finally make dynamic and static contact separation complete overcurrent protection separating brake.After completing, dynamic contact mechanism can complete reset under handle reduction torsion spring and both effect of stress of release lever reduction torsion spring, for closing a floodgate and prepare for the second time.
yet in the actual course of work, if the large electric current of abnormal failure appears in traditional circuit breaker, and this undercurrent is so that electromagnetic drive mechanism while making quick response, often cannot drive release lever action to force tripping to be threaded off in time.The running of electromagnetic drive mechanism needs the response time, response during this period of time in, first dynamic and static contact can scold and hold partition under the effect of electromotive force repulsion, and contact scolds out partition to cause repulsion first mate between dynamic and static contact to weaken convergence disappearance, now moving contact can again rotate to contacting with the silver point of fixed contact under the stress of moving contact reset tension spring, so repeated multiple times, this phenomenon is also called arc reignition.The chain event that the number of times of arc reignition is opened whole dynamic contact mechanism by electromagnetic drive mechanism determines, this phenomenon can cause repeatedly serious scaling loss to silver point and moving contact, reduces its energising useful life.This phenomenon simultaneously also will repeatedly produce a large amount of metal gas or claim electric arc, these will directly affect the insulation property of circuit breaker inside by the circuit breaker inside high-temperature metal gas producing of restriking, and enter into vicious circle district.Therefore at present traditional circuit breaker break-time is long, when there is abnormal large electric current, can not guarantee quiet, moving contact disjunction within the very first time, circuit breaker is enough to damage within the response time of electromagnetic drive mechanism.
Summary of the invention
the present invention seeks to: a kind of breaker rapid disjunction device is provided; this device can be within the response time of electromagnetic drive mechanism; only rely on the electromotive force repulsion producing between contact to force quiet, the thorough disjunction of moving contact; with this, overcome existing circuit breaker break-time long; cannot guarantee disjunction in the very first time, can not effectively protect the shortcoming of contact.
technical scheme of the present invention is: a kind of breaker rapid disjunction device, comprise static contact mechanism and the dynamic contact mechanism be located in housing, described static contact mechanism comprises fixed contact and electromagnetic drive mechanism, described dynamic contact mechanism comprises that handle mechanism, main shaft, rotation are assemblied in moving contact rack on main shaft, by moving contact rotating shaft rotation, are assemblied in the moving contact on moving contact rack, the tripping being connected with handle mechanism with moving contact rack, and the release lever that coordinates and can force by the driving of electromagnetic drive mechanism tripping dropout with tripping; It is characterized in that described dynamic contact mechanism also comprises can drive drive the movable additional drives bar that departs from tripping of release lever by moving contact.
concrete structure and assembling form for additional drives bar in the present invention have following several preferred schemes:
1) described additional drives bar is push rod, on described push rod, has axis hole, and is assemblied on main shaft by this axis hole rotation; The upper end of described push rod forms horizontal push arm, and is resisted against on release lever by this push arm; And the lower end of described push rod also forms horizontal push arm, and be resisted against on moving contact by this push arm; And described push rod and release lever against point, be positioned at main shaft top, and push rod and moving contact against point, be positioned at moving contact rotating shaft below.
2) described additional drives bar is push rod, and described push rod upper end is connected with release lever, and push rod lower end is connected with moving contact, or forms horizontal push arm, and is resisted against on moving contact by this push arm; And the tie point of described push rod and release lever is positioned at main shaft top, and the tie point of push rod and moving contact or contact point are positioned at moving contact rotating shaft below.
3) described additional drives bar is push rod, and the lower end of described push rod is connected with moving contact, and push rod upper end is connected with release lever, or forms horizontal push arm, and is resisted against on release lever by this push arm; And the tie point of described push rod and moving contact is positioned at moving contact rotating shaft below, and the tie point of push rod and release lever or contact point are positioned at main shaft top.
certainly above-mentioned 2) and 3) in two schemes, on described push rod, also can have axis hole, and rotate and be assemblied on main shaft by this axis hole.
4) described additional drives bar is pull bar, and one end of described pull bar is connected with release lever, and the other end of described pull bar is connected with moving contact, or forms horizontal push arm, and is resisted against on moving contact by this push arm; And the tie point of described pull bar and release lever is positioned at main shaft below, and the tie point of pull bar and moving contact or contact point are positioned at the below of moving contact rotating shaft.
electromagnetic drive mechanism described in the present invention is routine techniques, it specifically comprises coil rack, be wrapped in solenoid on coil rack, be fixed on moving iron core and static iron core in coil rack, fixed magnetic core push rod on described moving iron core, described magnetic core push rod passes from static iron core, and is provided with stage clip between quiet, moving iron core; Described fixed contact is fixed on coil rack front end relative with moving contact, and fixed contact is provided with silver point.
dynamic contact mechanism described in the present invention is also routine techniques, and the concrete structure arrangement form of moving contact wherein, tripping, release lever and handle mechanism can be known any one form of continuous action relation each other that meets.Certainly in the present invention, preferably adopt conventional following version:
described moving contact is sheathed on main shaft by mounting hole, described main shaft is positioned at moving contact rotating shaft top, and between this moving contact and housing, be connected with moving contact reset tension spring, the tie point of described moving contact reset tension spring and moving contact is between main shaft and moving contact rotating shaft.
described release lever rotation is assemblied on main shaft, is equipped with release lever reduction torsion spring on described main shaft simultaneously, and described tripping is assemblied on moving contact rack by tripping rotating shaft rotation, and this tripping is provided with the hook part hook part overlap joint that be provided with corresponding to release lever top; Described handle mechanism comprises that the arm pivot post that is fixed in housing, rotation are assemblied in the switch lever on arm pivot post and connect the tripping drive rod of switch lever and tripping, are equipped with handle reduction torsion spring on described arm pivot post.
concrete structure shape for additional drives bar in the present invention is not construed as limiting.
specific works principle of the present invention is as follows: in the breaker electrifying course of work, occur the large electric current of abnormal failure, and electromagnetic drive mechanism is also within the response time time, first dynamic and static contact can scold and hold under the effect of electromotive force repulsion, it is moving contact moving contact rotating shaft rotation, and the additional drives bar activity that rotarily driven of moving contact, and then promote or pull release lever movable by additional drives bar, release lever and tripping are departed from, the poised state of breaking dynamic contact mechanism, completes dropout.There are a series of interlocks in dynamic contact mechanism immediately; under the effect of stress of handle reduction torsion spring; tripping is rotated and is driven moving contact rack to rotate around main shaft; the final thorough disjunction that completes moving contact and fixed contact within the response time of electromagnetic drive mechanism; for protective circuit breaker and power grid security try to gain time precious to one, danger simultaneously that also protect silver point and moving contact to avoid restriking.
certainly the same with routine techniques, if the present invention meets with the large electric current of abnormal failure when work, and when this large electric current can force electromagnetic drive mechanism to respond fast, additional drives bar is just inoperative, now, release lever equally relies on the magnetic core push rod in electromagnetic drive mechanism to eject the disengaging realizing with tripping with conventional, and then makes dynamic contact mechanism interlock, completes dynamic and static contact disjunction subsequently.
advantage of the present invention is:
1. this breaker rapid disjunction device provided by the invention, can be within the response time of electromagnetic drive mechanism, only rely on the electromotive force repulsion producing between contact to force quiet, the thorough disjunction of moving contact, with this, overcome existing circuit breaker break-time long, cannot guarantee disjunction in the very first time, can not effectively protect the shortcoming of contact; For protective circuit breaker and power grid security try to gain time precious to one, danger simultaneously that also protect silver point and moving contact to avoid restriking.
2. this breaker rapid disjunction device provided by the invention, compare the electromagnetic drive mechanism that only relies on of current routine and implement the circuit breaker of disjunction, owing to having increased additional drives bar, can use electromagnetic force and electromotive force repulsion to order about circuit breaker disjunction simultaneously, dual job security and the functional reliability that has guaranteed circuit breaker, the breaking capacity of circuit breaker is further improved, and for this reason, the present invention is very suitable to be applied on high breaking circuit breaker that rated current is larger.
Accompanying drawing explanation
below in conjunction with drawings and Examples, the invention will be further described:
fig. 1 is the structural representation of a kind of specific embodiment of the present invention;
fig. 2 is the structural representation of the second specific embodiment of the present invention.
wherein: 1, fixed contact; 2, main shaft; 3, moving contact rack; 4, moving contact rotating shaft; 5, moving contact; 6, tripping; 7, release lever; 8, additional drives bar; 9, coil rack; 10, solenoid; 11, moving iron core; 12, static iron core; 13, magnetic core push rod; 14, stage clip; 15, silver point; 16, moving contact reset tension spring; 17, release lever reduction torsion spring; 18, tripping rotating shaft; 19, arm pivot post; 20, switch lever; 21, tripping drive rod; 22, handle reduction torsion spring.
Embodiment
embodiment 1: be illustrated in figure 1 a kind of specific embodiment of breaker rapid disjunction device of the present invention, its static contact mechanism and dynamic contact mechanism in being located at housing (omitting in figure) forms, and described static contact mechanism is comprised of fixed contact 1 and electromagnetic drive mechanism.The same with routine techniques, described electromagnetic drive mechanism comprises coil rack 9, be wrapped in solenoid 10 on coil rack 9, be fixed on moving iron core 11 and static iron core 12 in coil rack 9, fixed magnetic core push rod 13 on described moving iron core 11, described magnetic core push rod 13 passes from static iron core 12, and is provided with stage clip 14 between quiet, moving iron core 12,11; Described fixed contact 1 is fixed on coil rack 9 front ends relative with moving contact 5, and fixed contact 1 is provided with silver point 15.
dynamic contact mechanism described in the present embodiment consists of jointly handle mechanism, main shaft 2, moving contact rack 3, moving contact rotating shaft 4, moving contact 5, moving contact reset tension spring 16, tripping 6, tripping rotating shaft 18, release lever 7, release lever reduction torsion spring 17 and additional drives bar 8.Described main shaft 2 is fixed in housing, and moving contact rack 3 and the common rotation of release lever 7 are assemblied on main shaft 2, and are equipped with release lever reduction torsion spring 17 on main shaft 2.Described moving contact 5 is assemblied on moving contact rack 3 by moving contact rotating shaft 4 rotations, described moving contact 5 is sheathed on main shaft 2 by mounting hole simultaneously, described main shaft 2 is positioned at moving contact rotating shaft 4 tops, and between this moving contact 5 and housing, be connected with moving contact reset tension spring 16, the tie point of described moving contact reset tension spring 16 and moving contact 5 is between main shaft 2 and moving contact rotating shaft 4.
tripping described in the present embodiment 6 is assemblied on moving contact rack 3 by tripping rotating shaft 18 rotations, and this tripping 6 is provided with the hook part hook part overlap joint that be provided with corresponding to release lever 7 tops; Described handle mechanism comprise the arm pivot post 19 that is fixed in housing, rotation be assemblied in switch lever 20Ji two ends on arm pivot post 19 respectively with the tripping drive rod 21 of switch lever 20 and tripping 6 pivot joints, on described arm pivot post 19, be equipped with handle reduction torsion spring 22.
the design core of the present embodiment has been to increase and can has driven and drive the movable additional drives bar 8 that departs from tripping 6 of release lever 7 by moving contact 5, and this additional drives bar 8 is push rod, has axis hole on push rod, and is assemblied on main shaft 2 by this axis hole rotation; The upper end of described push rod forms horizontal push arm (invisible in figure), and is resisted against on release lever 7 by this push arm; And the lower end of described push rod also forms horizontal push arm (invisible in figure), and be resisted against on moving contact 5 by this push arm; And described push rod and release lever 7 against point, be positioned at main shaft 2 tops, and push rod and moving contact 5 against point, be positioned at moving contact rotating shaft 4 belows.
the specific works principle of the present embodiment is as follows: in the breaker electrifying course of work, occur the large electric current of abnormal failure, and electromagnetic drive mechanism is also within the response time time, first dynamic and static contact 5,1 can scold and hold under the effect of electromotive force repulsion, be moving contact 5 moving contact rotating shaft 4 rotations, and the additional drives bar 8 that rotarily driven of moving contact 5 rotates around main shaft 2, and then rotated counterclockwise by additional drives bar 8 promotion release levers 7, release lever 7 and tripping 6 are departed from, the poised state of breaking dynamic contact mechanism, completes dropout.There are a series of interlocks in dynamic contact mechanism immediately; under the effect of stress of handle reduction torsion spring 22; tripping 6 is rotated and is driven moving contact rack 3 to rotate around main shaft 2; the final thorough disjunction that completes moving contact 5 and fixed contact 1 within the response time of electromagnetic drive mechanism; for protective circuit breaker and power grid security try to gain time precious to one, danger simultaneously that also protect silver point and moving contact to avoid restriking.
certainly the same with routine techniques, if the present embodiment meets with the large electric current of abnormal failure when work, and when this large electric current can force electromagnetic drive mechanism to respond fast, additional drives bar 8 is just inoperative, now, release lever 7 equally relies on the magnetic core push rod 13 in electromagnetic drive mechanism to eject the disengaging realizing with tripping 6 with conventional, and then makes dynamic contact mechanism interlock, completes dynamic and static contact 5,1 disjunction subsequently.
embodiment 2: as shown in Figure 2, the difference of the present embodiment and embodiment 1 is that its additional drives bar 8 adopts the version of pull bar, one end of described pull bar and release lever 7 are articulated, and the other end of described pull bar forms horizontal push arm (invisible in figure), and be resisted against on moving contact 5 by this push arm; And the tie point of described pull bar and release lever 7 is positioned at main shaft 2 belows, and the tie point of pull bar and moving contact 5 or contact point are positioned at the below of moving contact rotating shaft 4.The present embodiment all the other with embodiment 1.
the specific works principle of the present embodiment and the difference of embodiment 1: in the breaker electrifying course of work, occur the large electric current of abnormal failure, and electromagnetic drive mechanism is also within the response time time, first dynamic and static contact 5,1 can scold and hold under the effect of electromotive force repulsion, be moving contact 5 moving contact rotating shaft 4 rotations, and additional drives bar 8 activities that rotarily driven of moving contact 5, and then pull release lever 7 to rotate counterclockwise by additional drives bar 8, release lever 7 and tripping 6 are departed from, the poised state of breaking dynamic contact mechanism, completes dropout.
certainly above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformation or modification that according to the present invention, the Spirit Essence of main technical schemes is done, within all should being encompassed in protection scope of the present invention.
Claims (9)
1. a breaker rapid disjunction device, comprise static contact mechanism and the dynamic contact mechanism be located in housing, described static contact mechanism comprises fixed contact (1) and electromagnetic drive mechanism, described dynamic contact mechanism comprises handle mechanism, main shaft (2), rotation is assemblied in the moving contact rack (3) on main shaft (2), by moving contact rotating shaft (4) rotation, be assemblied in the moving contact (5) on moving contact rack (3), the tripping (6) being connected with handle mechanism with moving contact rack (3), and the release lever (7) that coordinates with tripping (6) and can force by the driving of electromagnetic drive mechanism tripping (6) to be threaded off, it is characterized in that described dynamic contact mechanism also comprises can drive drive the movable additional drives bar (8) that departs from tripping (6) of release lever (7) by moving contact (5).
2. breaker rapid disjunction device according to claim 1, is characterized in that described additional drives bar (8) is push rod, has axis hole on described push rod, and is assemblied on main shaft (2) by this axis hole rotation; The upper end of described push rod forms horizontal push arm, and is resisted against on release lever (7) by this push arm; And the lower end of described push rod also forms horizontal push arm, and be resisted against on moving contact (5) by this push arm; And described push rod and release lever (7) against point, be positioned at main shaft (2) top, and push rod and moving contact (5) against point, be positioned at moving contact rotating shaft (4) below.
3. breaker rapid disjunction device according to claim 1, it is characterized in that described additional drives bar (8) is push rod, described push rod upper end is connected with release lever (7), and push rod lower end is connected with moving contact (5), or form horizontal push arm, and be resisted against on moving contact (5) by this push arm; And the tie point of described push rod and release lever (7) is positioned at main shaft (2) top, and the tie point of push rod and moving contact (5) or contact point are positioned at moving contact rotating shaft (4) below.
4. breaker rapid disjunction device according to claim 1, it is characterized in that described additional drives bar (8) is push rod, the lower end of described push rod is connected with moving contact (5), and push rod upper end is connected with release lever (7), or form horizontal push arm, and be resisted against on release lever (7) by this push arm; And the tie point of described push rod and moving contact (5) is positioned at moving contact rotating shaft (4) below, and the tie point of push rod and release lever (7) or contact point are positioned at main shaft (2) top.
5. according to the breaker rapid disjunction device described in claim 3 or 4, it is characterized in that having axis hole on described push rod, and be assemblied on main shaft (2) by this axis hole rotation.
6. breaker rapid disjunction device according to claim 1, it is characterized in that described additional drives bar (8) is pull bar, one end of described pull bar is connected with release lever (7), and the other end of described pull bar is connected with moving contact (5), or form horizontal push arm, and be resisted against on moving contact (5) by this push arm; And the tie point of described pull bar and release lever (7) is positioned at main shaft (2) below, and the tie point of pull bar and moving contact (5) or contact point are positioned at the below of moving contact rotating shaft (4).
7. breaker rapid disjunction device according to claim 1, it is characterized in that described electromagnetic drive mechanism comprises coil rack (9), is wrapped in solenoid (10) on coil rack (9), is fixed on moving iron core (11) and static iron core (12) in coil rack (9), the upper fixed magnetic core push rod (13) of described moving iron core (11), described magnetic core push rod (13) passes from static iron core (12), and is provided with stage clip (14) between quiet, moving iron core (12,11); Described fixed contact (1) is fixed on coil rack (9) front end relative with moving contact (5), and fixed contact (1) is provided with silver point (15).
8. breaker rapid disjunction device according to claim 1, it is characterized in that described moving contact (5) is sheathed on main shaft (2) by mounting hole, described main shaft (2) is positioned at moving contact rotating shaft (4) top, and between this moving contact (5) and housing, be connected with moving contact reset tension spring (16), the tie point of described moving contact reset tension spring (16) and moving contact (5) is positioned between main shaft (2) and moving contact rotating shaft (4).
9. according to the breaker rapid disjunction device described in claim 1 or 8, it is characterized in that described release lever (7) rotation is assemblied on main shaft (2), on described main shaft (2), be equipped with release lever reduction torsion spring (17) simultaneously, it is upper that described tripping (6) is assemblied in moving contact rack (3) by tripping rotating shaft (18) rotation, and this tripping (6) is provided with the hook part hook part overlap joint that be provided with corresponding to release lever (7) top; Described handle mechanism comprises that the arm pivot post (19) that is fixed in housing, rotation are assemblied in the switch lever (20) on arm pivot post (19) and connect the tripping drive rod (21) of switch lever (20) and tripping (6), are equipped with handle reduction torsion spring (22) on described arm pivot post (19).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110441959.5A CN102436984B (en) | 2011-12-26 | 2011-12-26 | Breaker rapid disjunction device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110441959.5A CN102436984B (en) | 2011-12-26 | 2011-12-26 | Breaker rapid disjunction device |
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| CN102436984A CN102436984A (en) | 2012-05-02 |
| CN102436984B true CN102436984B (en) | 2014-01-15 |
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| CN201110441959.5A Active CN102436984B (en) | 2011-12-26 | 2011-12-26 | Breaker rapid disjunction device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104332365B (en) * | 2014-11-17 | 2016-08-17 | 法泰电器（江苏）股份有限公司 | The short delayed releasing mechanism of selective protection formula miniature circuit breaker |
| CN104505316B (en) * | 2015-01-14 | 2017-04-05 | 法泰电器（江苏）股份有限公司 | The overcurrent protection of chopper |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201576638U (en) * | 2009-11-12 | 2010-09-08 | 徐浩明 | Small circuit breaker current limiting device |
| CN102129941A (en) * | 2010-01-19 | 2011-07-20 | 三菱电机株式会社 | Circuit breaker |
| CN202384276U (en) * | 2011-12-26 | 2012-08-15 | 法泰电器（江苏）股份有限公司 | Quick breaking device for circuit breaker |
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2011
- 2011-12-26 CN CN201110441959.5A patent/CN102436984B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201576638U (en) * | 2009-11-12 | 2010-09-08 | 徐浩明 | Small circuit breaker current limiting device |
| CN102129941A (en) * | 2010-01-19 | 2011-07-20 | 三菱电机株式会社 | Circuit breaker |
| CN202384276U (en) * | 2011-12-26 | 2012-08-15 | 法泰电器（江苏）股份有限公司 | Quick breaking device for circuit breaker |
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| CN102436984A (en) | 2012-05-02 |
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