CN204857636U - Rapid interrupter's explosion chamber and miniaturized circuit breaker of applied this explosion chamber - Google Patents
Rapid interrupter's explosion chamber and miniaturized circuit breaker of applied this explosion chamber Download PDFInfo
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- CN204857636U CN204857636U CN201520289279.XU CN201520289279U CN204857636U CN 204857636 U CN204857636 U CN 204857636U CN 201520289279 U CN201520289279 U CN 201520289279U CN 204857636 U CN204857636 U CN 204857636U
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- arc
- circuit breaker
- control device
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Abstract
The utility model relates to a rapid interrupter's explosion chamber and miniaturized circuit breaker of applied this explosion chamber, the explosion chamber includes shell of being made by insulating material and the arc extinguishing bars piece of being made by metal material, two lateral walls on the shell are being provided with the fluting near electric arc spout department, the side of arc extinguishing bars piece is provided with the arch, this arch with fluting on the explosion chamber shell corresponds the setting and holds in the inslot. Miniaturized circuit breaker adopts functional unit stacked structure to come reduced size, simultaneously circuit breaker casing side with the position that the fluting is corresponding that sets up on the explosion chamber shell is provided with the decompression jetexhaust. This explosion chamber realizes that rapid interrupter and breaking capacity improve under not changing the explosion chamber volume and do not reduce the prerequisite of manufacturability, in the high breaking capacity's of specially adapted needs the miniaturized circuit breaker. The utility model discloses simple structure, the technological level requires the samely with the existing product, can conveniently realize the miniaturization of circuit breaker and breaking capacity's improvement.
Description
Technical field
The utility model relates to Low Voltage Electrical Apparatus, especially relates to a kind of arc control device of fast arc extinction and applies the miniaturized circuit breaker of these arc control device.
Background technology
Arc control device are as the critical function parts of in low-voltage electrical apparatus, the height of its performance plays conclusive effect to low-voltage electrical apparatus breaking capacity and useful life, arc control device particularly in circuit breaker, so improve the performance of arc control device, particularly it is that Low Voltage Electrical Apparatus pursues the important means of high breaking capacity to the elongation of electric arc and cooling capacity always, usual way strengthens arc extinguishing grid pieces surface area, increase grid quantity and carry out the increasing of arc control device capacity to improve the breaking capacity of arc control device, but such method can make arc control device volume constantly increase, and then the problem brought is the continuous increase of circuit breaker volume, this obviously and circuit breaker run counter to the trend of miniaturization.
Circuit breaker is as the critical elements in low-voltage electrical apparatus, its miniaturization and high-performance are the targets that Low Voltage Electrical Apparatus is constantly pursued always, in the epoch that new forms of energy development grows, especially the fast development of field of photovoltaic power generation, photovoltaic can flow a large amount of uses of case, miniaturized and high performance circuit breaker not only can make the header box of same volume hold the photovoltaic generation unit of more multichannel, brings great convenience simultaneously, also reduce the cost of whole system to operation and maintenance.
Chinese utility model patent application publication number CN101868840B discloses a kind of arc chamber of switching device, its technical measures is: in arc control device, add the magnetic pole that ferrimagnet is formed, the magnetic pole that described ferrimagnet is formed is arranged on the end of " U " shape arc extinguishing grid pieces forked section in arc control device, in order to the magnetic pole making set ferrimagnet form can not by each arc extinguishing grid pieces short circuit, so the magnetic pole that described ferrimagnet is formed wraps up by its housing being also provided with an insulation, the electric arc produced when simultaneously also making low-voltage electrical apparatus disconnect can not by described ferrimagnet short circuit.
What the magnetic pole that ferrimagnet described in technique scheme is formed was arranged is the volume needing to reduce major part arc extinguishing grid pieces in advance, although the magnetic pole that the ferrimagnet arranged like this is formed can strengthen the magnetic field in arc control device region but its effect is limited, reason is that recruitment that magnetic pole that described ferrimagnet is formed more does not arrange its permeable section of arc control device of this magnetic pole is only had an appointment the half of magnetic pole that described ferrimagnet forms, simultaneously because the setting of described insulation shell makes to there is certain magnetic resistance between arc extinguishing grid pieces and described magnetic pole, so it is limited that its magnetic field to arc control device region strengthens.Further, the magnetic pole that above-mentioned ferrimagnet is formed is arranged in the housing of an insulation, so it is very micro-to the cooling capacity of electric arc, and arc control device must be caused to decline to the cooling capacity of electric arc concerning the minimizing of its grid cumulative volume whole arc control device, all in all, the breaking capacity of technique scheme to raising arc control device is limited, simultaneously it is limited by again the impact of arc control device overall volume, so be apparent concerning realizing miniaturized difficulty the low-voltage electrical apparatus using arc control device in this technical scheme.
Utility model content
Based on the problems referred to above, the purpose of this utility model is to provide a kind of arc control device of fast arc extinction, it adopts the arc extinguishing grid pieces increased with the arc control device housing of decompression exhaust spout and volume to improve arc control device cooling capacity and Distribution of Magnetic Field, and then realizes fast arc extinction and the high breaking of arc control device under same volume;
Another object of the present utility model is to provide a kind of circuit breaker of miniaturization, and it adopts the arc control device of described fast arc extinction and functional part stepped construction to realize miniaturization.Because it does not reduce each functional unit, circuit breaker performance is not reduced while miniaturization, coordinate the arc control device of described fast arc extinction to improve cooling and the extinguishing speed of electric arc by arc voltage release tech, to meet circuit breaker miniaturization and high performance requirement simultaneously.
In order to realize the purpose of this utility model, following technical scheme is proposed:
Arc control device for fast arc extinction, described arc control device 1 comprise:
A housing be made up of insulating material 11, is provided with arc extinguishing grid pieces positioning bar 112, two sidewalls and is provided with fluting 113 in described housing 11;
An arc extinguishing grid pieces be made up of metal material 12, the general shape of arc extinguishing grid pieces 12 is " U " shape, is arranged in described housing 11;
A flash barrier be made up of insulating material 13, flash barrier 13 and housing 11 form the cavity of a relative closure jointly, and flash barrier 13 top arranges electric arc spout 14; The fluting 113 of described housing 11 is arranged at electric arc spout 14 side.
Described fluting 113 in the vertical arc extinguishing grid pieces 12 lower side a slice lower surface to uppermost a slice upper surface between, laterally initial from described housing 11 left surface 111, until the left side of the rectangular projection line of described arc extinguishing grid pieces 12 upper surface " U " shape circular arc summit 121 line on described housing 11 sidewall 114 is terminated.
Described arc extinguishing grid pieces 12 is made up of cold-rolled low carbon steel plate stamping, and two sides are respectively provided with a lug boss 122, and described lug boss 122 is contained in the fluting 113 of described housing 11, increases arc control device capacity and improves Distribution of Magnetic Field.
According to an embodiment of the present utility model, propose a kind of arc control device of fast arc extinction, described arc control device 8 are made up of housing, arc extinguishing grid pieces 82 and flash barrier 83, and described housing is made up of two panels insulation board sidewall 81, and described sidewall 81 has square hole 811; Described arc extinguishing grid pieces 82 is provided with lug boss 821, and described lug boss 821 penetrates described square hole 811 and adopts the mode of riveted joint and sidewall 81 to fix; Described sidewall 81 is made up of the punching press of melamine glass-cloth board.
The utility model also proposes a kind of miniature circuit breaker using described arc control device, described circuit breaker comprises arc control device 1, fixed contact 2, moving contact 3, operating mechanism 4, release 5, housing 6 and baffle plate 7, wherein, described arc control device 1 are arranged at deciliter region of described dynamic and static contact 2,3; Described fixed contact 2 has one " U " shape bending part 21, the part of described bending part 21 near operating mechanism 4 side is arranged at the below of operating mechanism 4, has overlapping in the vertical direction with operating mechanism 4, make fixed contact 2 and moving contact 3 have one section overlapping.
Described housing 6 comprises pedestal 61, described pedestal 61 is provided with an insulation and cuts off part 611, described insulation cut off part 611 be an entirety with pedestal 61 and molded by pedestal 61 time together make.
It is an arc insulating apparatus 9 that described insulation cuts off part 611, described arc insulating apparatus 9 comprises cross sectional shape and is roughly the Part I 91 of " recessed " font and the interior shape Part II 92 corresponding with " U " shape bending part of described fixed contact 2, described Part II is wrapped in " U " shape bending part of described fixed contact 2, and Part I is wrapped in " U " shape bending part of described fixed contact 2 on the conducting base of moving contact 3 side; Described arc insulating apparatus 9 is made up of gas exhausted material.
Described housing 6 is provided with pressure release spout 601 on two lateral walls with on the correspondence position of the fluting 113 on the housing 11 of described arc control device 1, described pressure release spout 601 and the angle of housing 6 sidewall be acute angle and opening direction towards cover; Described housing 6 is provided with fluting 612 on two lateral walls with on the correspondence position of fluting 113, and described fluting 612 forms a passage with described fluting 113, and a part for high temperature and high pressure gas is discharged from described pressure release spout 601 through described passage.
Described baffle plate 7 is the thin plate with elongated hole 71 that a punching press is made, and described moving contact 3 is through described elongated hole 71, and described baffle plate 7 moves with moving contact 3.
Described release 5 has overlapping with operating mechanism 4 in the vertical direction, and a part for described release 5 is positioned at the below of operating mechanism 4.
The beneficial effect that technical solutions of the utility model are brought:
Compared with prior art, the arc control device in the utility model can not change current arc control device volume and realize fast arc extinction and breaking capacity raising under not reducing technological prerequisite, and it is specially adapted to need in the miniaturized circuit breaker of high breaking capacity.
The utility model structure is simple, and technological level requires identical with existing product, can realize the miniaturization of circuit breaker easily, can realize the raising of breaking capacity simultaneously.
Accompanying drawing explanation
Fig. 1 is the axis side view of the utility model embodiment one arc control device;
Fig. 2 is the section of the utility model embodiment one arc control device;
Fig. 3 is the axis side view of the utility model embodiment one arc control device housing;
Fig. 4 is the axis side view of the utility model embodiment one arc extinguishing grid pieces;
Fig. 5 is the axis side view of the utility model embodiment one flash barrier;
Fig. 6 is the cutaway view of the utility model embodiment one circuit breaker;
Fig. 7 is the axis side view of the utility model embodiment one fixed contact;
Fig. 8 is the axis side view of the utility model embodiment one circuit breaker;
Fig. 9 is the axis side view of the utility model embodiment one circuit breaker;
Figure 10 is the cutaway view of the utility model embodiment one Shell of circuit breaker;
Figure 11 is the cutaway view of the utility model embodiment one circuit breaker base;
Figure 12 is the axis side view of the utility model embodiment one circuit breaker cover;
Figure 13 is the axis side view of the utility model embodiment one baffle plate;
Figure 14 is the axis side view of the utility model embodiment two arc control device;
Figure 15 is the axis side view of the utility model embodiment two sidewall;
Figure 16 is the axis side view of the utility model embodiment two arc extinguishing grid pieces;
Figure 17 is the cutaway view of the utility model embodiment three circuit breaker;
Figure 18 is the axis side view of the utility model embodiment three arc insulating cover;
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment one
As Figure 1-Figure 5, the arc control device 1 that the utility model relates to comprise a housing be made up of insulating material 11, arc extinguishing grid pieces be made up of metal material 12, flash barrier be made up of insulating material 13; Flash barrier 13 and housing 11 form the cavity of a relative closure jointly; The general shape of arc extinguishing grid pieces 12 is " U " shape, is arranged in described housing 11; Flash barrier 13 top arranges electric arc spout 14; Be provided with arc extinguishing grid pieces positioning bar 112, two sidewalls in described housing 11 and be provided with fluting 113, and this fluting 113 is arranged at electric arc spout 14 side.
Further, described fluting 113 in the vertical lower side a slice arc extinguishing grid pieces 12 lower surface to uppermost a slice arc extinguishing grid pieces 12 upper surface between, laterally terminate from the left side of the rectangular projection line 17 of circular arc summit 121 line on described housing 11 sidewall 114 of initial until described arc extinguishing grid pieces 12 upper surface " U " the shape feature of described housing 11 left surface 111.This fluting 113 can reduce arc control device internal pressure, is beneficial to electric arc and elongates, cool and increase arc extinguishing grid pieces capacity.
Further, two sides of described arc extinguishing grid pieces 12 are respectively provided with a lug boss 122, and described lug boss 122 is contained in the fluting 113 of described housing 11; Described arc extinguishing grid pieces 12 is made up of cold-rolled low carbon steel plate stamping; This projection can increase arc control device capacity and improve Distribution of Magnetic Field.
The miniaturized circuit breaker of arc control device 1 as described in the application of Fig. 6-Figure 13 shows that the utility model, this circuit breaker comprises arc control device 1, fixed contact 2, moving contact 3, operating mechanism 4, release 5, housing 6, dividing plate 7.Wherein: described arc control device 1 are arranged at deciliter region of dynamic/static contact in housing, its in circuit breaker deciliter produce the extinguishing of electric arc; Described fixed contact 2 has one " U " shape bending part 21, described bending part 21 has overlapping with operating mechanism 4 in the vertical direction;
Further, described bending part 21 is arranged at the below of operating mechanism 4 near the part of mechanism side, and then make fixed contact 2 and moving contact 3 have one section overlapping, this overlap makes circuit breaker can shorten length corresponding to lap in the longitudinal direction, and then the more miniaturized of circuit breaker design can be made, this overlap can also make circuit breaker moving contact when disconnecting be subject to fixed contact overlapping its Lorentz force partly given, this Lorentz force forces moving contact to be opened fast, and then accelerate the opening speed of circuit breaker, so circuit breaker will disconnect when electric current does not also rise to maximum, so the energy that whole circuit breaker bears also will reduce, namely the current limiting performance of circuit breaker has had lifting, the utility model is not sacrificed this important indicator of circuit breaker breaking capacity and is made breaking capacity improve on the contrary while making circuit breaker miniaturization as can be seen here,
Due to described fixed contact 2 and moving contact 3 have one section overlapping, so in order to ensure that electric arc that circuit breaker produces when disjunction big current is unlikely to make " U " shape bending part and the short circuit of moving contact afterbody of fixed contact 2, pedestal 61 is provided with an insulation and cuts off part 611, described insulation cut off part 611 be an entirety with pedestal 61 and molded by base mold time together make;
Described moving contact 3 is provided with a baffle plate 7 moved with moving contact 3, described baffle plate 7 is the thin plate with elongated hole 71 that a punching press is made, wherein moving contact is through the elongated hole 71 on described baffle plate 7, move relative to described baffle plate 7 in the certain limit of the elongated hole 71 of moving contact 3 on described baffle plate 7, described baffle plate 7 will be driven to move when moving contact 3 moves to one side of the elongated hole 71 on described baffle plate 7, this baffle plate 7 can close high-temperature gas that arc control device region makes disjunction during at the opening of mechanism side, electric arc causes and slag can not spray to mechanism section and damage mechanism and mechanism rear for the copper flexible cord that is electrically connected and release 5,
Described release 5 has overlapping with operating mechanism 4 in the vertical direction, further, a part for described release 5 is positioned at the below of operating mechanism 4, circuit breaker is made to achieve dimension reduction in the longitudinal direction when not reducing release volume like this, release is understood as the personage in industry completely for the important function of circuit breaker, ensure that the stability of circuit breaker and reliability must be provided with the enough stable and reliable release of performance, and in the technical program, just change the position of release, so its stability and reliability are remained by good,
Described housing 6 is slotted with described arc control device 1 on two lateral walls in arc control device 1 region 113 correspondence position on be provided with pressure release spout 601;
Further, fluting 612 is provided with on two lateral walls on described housing 6 with on the correspondence position of the fluting 113 on the housing 11 of described arc control device 1, described fluting 612 and described arc control device 1 are slotted 113 formation passage, a part for the high temperature and high pressure gas produced during circuit breaker disjunction will be discharged from described pressure release spout 601 through described passage, therefore the temperature and pressure of circuit breaker internal all will reduce, electric arc is cooled, and the impact that Shell of circuit breaker is subject to also will reduce.
The pressure release spout 601 that described housing 6 is arranged in arc control device 3 region and the angle of housing sidewall be acute angle and opening direction towards cover.
Embodiment two
As Figure 14, Figure 15, shown in Figure 16, with above-described embodiment one difference be, the housing of described arc control device 8 can also be made up of as sidewall 81 two panels insulation board, described sidewall 81 has square hole 811, described arc extinguishing grid pieces 82 is provided with lug boss 821, described lug boss 821 to penetrate in the square hole 811 that described sidewall 81 has and adopts the mode of riveted joint fixing with sidewall 81, further described sidewall is made up of the punching press of melamine glass-cloth board, sidewall high-temperature electric arc in circuit breaker is short-circuited disjunction that described melamine glass-cloth board is made causes sidewall to discharge to be beneficial to the gas of arc extinction, and then be beneficial to the extinguish fast of electric arc and improve circuit breaker breaking capacity.
Embodiment three
As Figure 17, shown in Figure 18, with above-described embodiment one difference be, described insulation cuts off part 611 for being wrapped in an arc insulating apparatus 9 of " U " shape bending part on fixed contact 2, described arc insulating apparatus 9 is molded plastic parts, its interior shape is roughly the same with " U " shape bending part of contact 2, further described arc insulating apparatus 9 comprises Part I 91 and Part II 92, described Part I 91 cross sectional shape is roughly " recessed " font, described Part I is wrapped in " U " shape bending part of described fixed contact 2 on the conducting base 22 of moving contact side, further, described arc insulating apparatus is made up of gas exhausted material, when circuit breaker generation disjunction, described arc insulating apparatus at high temperature can discharge the gas being beneficial to arc extinction and cooling.
The circuit breaker of the utility model arc control device is used on volume, to have obvious reduction compared with the circuit breaker of prior art, and while reducing volume, do not change the size of internal functional unit, so its performance does not reduce because volume reduces compared with prior art circuit breaker, simultaneously fast arc extinction arc control device application and with arc control device slot the corresponding pressure release spout arranged can make to be short-circuited time the electric arc arc voltage that produces promote electric arc and to move to arc control device top and arc spraying mouth direction and then be conducive to the elongation of electric arc and discharge circuit breaker fast, so that electric arc can cool fast and extinguish, also mitigate the problem of the circuit breaker internal pressure increase brought because volume reduces simultaneously.
Above-described specific embodiment; further detailed description has been carried out to the purpose of this utility model, technical scheme and beneficial effect; be understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. arc control device for fast arc extinction, is characterized in that, described arc control device (1) comprising:
A housing be made up of insulating material (11), is provided with arc extinguishing grid pieces positioning bar (112) in described housing (11), two sidewalls are provided with fluting (113);
An arc extinguishing grid pieces be made up of metal material (12), the general shape of arc extinguishing grid pieces (12) is " U " shape, is arranged in described housing (11);
A flash barrier be made up of insulating material (13), flash barrier (13) and housing (11) form the cavity of a relative closure jointly, and flash barrier (13) top arranges electric arc spout (14); The fluting (113) of described housing (11) is arranged at electric arc spout (14) side.
2. arc control device according to claim 1, it is characterized in that, the lower surface that described fluting (113) is positioned at arc extinguishing grid pieces (12) lower side a slice in the vertical to uppermost a slice upper surface between, laterally initial from described housing (11) left surface (111), until the left side of the rectangular projection line of described arc extinguishing grid pieces (12) upper surface " U " shape circular arc summit (121) line on described housing (11) sidewall (114) is terminated.
3. arc control device according to claim 2, it is characterized in that, described arc extinguishing grid pieces (12) is made up of cold-rolled low carbon steel plate stamping, two sides are respectively provided with a lug boss (122), described lug boss (122) is contained in the fluting (113) of described housing (11), for increasing arc control device capacity and improve Distribution of Magnetic Field.
4. arc control device according to claim 1, is characterized in that, the sidewall (81) that described housing (11) is made up of insulation board of two panels is formed, and described sidewall (81) has square hole (811); Described arc extinguishing grid pieces (82) is provided with lug boss (821), described lug boss (821) penetrates described square hole (811) and adopts the mode of riveted joint and sidewall (81) to fix.
5. one kind uses the miniature circuit breaker as claim 1-4 arc control device as described in one of them, it is characterized in that, described circuit breaker comprises arc control device (1), fixed contact (2), moving contact (3), operating mechanism (4), release (5), housing (6) and baffle plate (7), wherein, described arc control device (1) are arranged at deciliter region of described dynamic and static contact (3,2); Described fixed contact (2) there is one " U " shape bending part (21), the part of described bending part (21) near operating mechanism (4) side is arranged at the below of operating mechanism (4), have overlapping in the vertical direction with operating mechanism (4), make fixed contact (2) and moving contact (3) have one section overlapping.
6. miniature circuit breaker according to claim 5, it is characterized in that, described housing (6) comprises pedestal (61), described pedestal (61) is provided with insulation partition part (611), described insulation cut off part (611) be an entirety with pedestal (61) and molded by pedestal (61) time together make.
7. miniature circuit breaker according to claim 6, it is characterized in that, it is an arc insulating apparatus (9) that described insulation cuts off part (611), and described arc insulating apparatus (9) comprises cross sectional shape and is roughly the Part I (91) of " recessed " font and the interior shape Part II (92) corresponding with " U " shape bending part of described fixed contact (2);
Described Part II is wrapped in " U " shape bending part of described fixed contact (2), and Part I is wrapped in " U " shape bending part of described fixed contact (2) on the conducting base of moving contact (3) side; Described arc insulating apparatus (9) is made up of gas exhausted material.
8. miniature circuit breaker according to claim 7, it is characterized in that, described housing (6) is provided with pressure release spout (601) on two lateral walls with on the correspondence position of the fluting (113) on the housing (11) of described arc control device (1), the angle of described pressure release spout (601) and housing (6) sidewall be acute angle and opening direction towards cover; Be provided with slot (612) on two lateral walls on described housing (6) with on the correspondence position of fluting (113), described fluting (612) and described fluting (113) form a passage, and a part for high temperature and high pressure gas is discharged from described pressure release spout (601) through described passage.
9. miniature circuit breaker according to claim 8, it is characterized in that, described baffle plate (7) is the thin plate with elongated hole (71) that a punching press is made, described moving contact (3) is through described elongated hole (71), and described baffle plate (7) moves with moving contact (3).
10. miniature circuit breaker according to claim 9, it is characterized in that, described release (5) has overlapping with operating mechanism (4) in the vertical direction, and a part for described release (5) is positioned at the below of operating mechanism (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520289279.XU CN204857636U (en) | 2015-05-06 | 2015-05-06 | Rapid interrupter's explosion chamber and miniaturized circuit breaker of applied this explosion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520289279.XU CN204857636U (en) | 2015-05-06 | 2015-05-06 | Rapid interrupter's explosion chamber and miniaturized circuit breaker of applied this explosion chamber |
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| Publication Number | Publication Date |
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| CN204857636U true CN204857636U (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520289279.XU Active CN204857636U (en) | 2015-05-06 | 2015-05-06 | Rapid interrupter's explosion chamber and miniaturized circuit breaker of applied this explosion chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810222A (en) * | 2015-05-06 | 2015-07-29 | 北京人民电器厂有限公司 | Arc extinguish chamber with quick arc extinguishing function and miniaturized circuit breaker with arc extinguish chamber |
| CN109360755A (en) * | 2018-11-26 | 2019-02-19 | 北京人民电器厂有限公司 | Arc-extinguishing mechanism and dc circuit breaker |
-
2015
- 2015-05-06 CN CN201520289279.XU patent/CN204857636U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810222A (en) * | 2015-05-06 | 2015-07-29 | 北京人民电器厂有限公司 | Arc extinguish chamber with quick arc extinguishing function and miniaturized circuit breaker with arc extinguish chamber |
| CN109360755A (en) * | 2018-11-26 | 2019-02-19 | 北京人民电器厂有限公司 | Arc-extinguishing mechanism and dc circuit breaker |
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