CN206003729U - Static contact, arc extinguishing external member and chopper - Google Patents

Abstract

This utility model is related to breaker technical field and in particular to a kind of static contact for chopper, the arc extinguishing external member with this static contact and chopper, and this static contact includes：For the stationary contact with the movable contact electrical contact of moving contact；Terminals；And electrically connect at least one arch busbar of described stationary contact and described terminals, at least one arch busbar wherein said is located at the side of stationary contact and arch direction extends towards moving contact side, and described stationary contact is surrounded in the projection in described side of the arcuate in shape of at least one arch busbar described.

Description

Static contact, arc extinguishing external member and chopper

Technical field

This utility model is related to breaker technical field and in particular to a kind of static contact for chopper and to have this quiet The arc extinguishing external member of contact and chopper.

Background technology

In technical field of electricity, chopper can be cut off, be connected electric current by the separating brake of dynamic/static contact, combined floodgate, and from Dynamic disengagement failure circuit.In dynamic/static contact separating brake because of active or fault of chopper, electric arc between dynamic/static contact, can be produced.

In order to effectively extinguish electric arc in dynamic/static contact disjunction, existing chopper is usually provided with arc-chutes and goes out Arc piece, the arc energy producing when moving contact is separated with static contact enters arc quenching plate under dependent interaction including for example include electric power To extinguish electric arc.

For this reason, it would be desirable to provide can improve arc quenching effect and can the structure that steeply rises of fault current limiting or Means.

Utility model content

Therefore, task of the present utility model is the arc extinguishing providing a kind of static contact for chopper and having this static contact External member and chopper.Static contact according to embodiment of the present utility model and arc extinguishing external member and the chopper with this static contact Not only arc quenching effect can be improved by providing or improving to the magnetic blow-out effect of electric arc, and larger electric repulsion can be produced Quickly scold and start contact and obtain reliable current limiting capacity.

This utility model is achieved through the following technical solutions：

This utility model provides a kind of static contact, including：For the stationary contact with the movable contact electrical contact of moving contact；Connect Line end；And at least one arch busbar of the described stationary contact of electrical connection and described terminals, at least one arch wherein said Shape busbar is located at the side of stationary contact and arch direction extends towards moving contact side, the arch of at least one arch busbar described Described stationary contact is surrounded in the projection in described side for the shape shape.Preferably, the arcuate in shape of busbar is in the projection of described side Also can surround be configured to movable contact or this movable contact contacting with this stationary contact at least a portion, most or all Range of movement.Being projected in some embodiments of the present disclosure of described side may be interpreted as in terms of stationary contact side, such as from side See in view.Described be enclosed in some embodiments of the present disclosure can be construed to besieged part, such as stationary contact is in conduction The arcuate in shape of row is in the envelope of side projection.

Compared to the static contact in correlation technique, the static contact according to this utility model embodiment is by using static contact stream The Lorentz force that the electric current crossed produces, to provide effective electric arc magnetic blow-out, improves arc quenching effect, the electricity that moving contact is subject to simultaneously Repulsion also can improve under the influence of a magnetic field, and when fault current occurs, moving contact can be opened rapidly, and limiting short-circuit current rises.Phase The ratio construction of the magnetizable stalloy in correlation technique or permanent magnet, passes through according to the static contact of this utility model embodiment Can produce using the electric current that static contact flows through that bigger, Lorentz force evenly is to provide more effective arc quenching effect, and have There is greater compactness of structure.Compared to the construction of the stalloy in correlation technique, carried according to the static contact of this utility model embodiment For electromagnetic field intensity be directly proportional with size of current, magnetic field will not saturation.And, compared to the structure of the permanent magnet in correlation technique Make, be provided that the suitability of alternating current-direct current chopper according to the static contact of this utility model embodiment.

Preferably, at least one arch busbar described has the flat plate shape extending in the side of described stationary contact.? In some embodiments, that is to say, the flat plate shape of described busbar is to be basically parallel to moving contact with respect to static contact motion Plane in extend.

Preferably, including a described arch busbar being pointed to described stationary contact both sides.This is conducive to transporting in moving contact Dynamic region forms equally distributed magnetic field.

Preferably, wherein said arch busbar is of similar shape.This advantageously forms equally distributed further Magnetic field.

Preferably, also include stationary contact support, wherein said stationary contact support electrically connects this to arch busbar, its Described in stationary contact support be at least partially situated at stationary contact one end adjacent to moving contact.Those skilled in the art it can be appreciated that This at least partially effective funtion part.

Preferably, this is all-in-one-piece metal bending to arch busbar, described stationary contact support and described terminals Part.

Preferably, it is additionally included in the striking corner fittings of the iron-based on described stationary contact support, described striking corner fittings is arranged on Stationary contact deviates from one end of moving contact.This striking corner fittings rapidly can guide electric arc into arc quenching plate from stationary contact, thus utilizing Arc quenching plate carries out disjunction to electric arc, effectively improves arc quenching effect.

This utility model additionally provides a kind of arc extinguishing external member, including：Arc-chutes, including moving contact opening, air vent, first Side wall and second sidewall；It is contained in the indoor multiple arc quenching plates of arc extinguishing；Aforesaid static contact, wherein this presss from both sides respectively to arch busbar Fasten to described the first side wall and second sidewall, thus described stationary contact is held stationary in described arc extinguishing interior.

Preferably, this extends along the edge of described the first side wall and second sidewall respectively to arch busbar.This maximizes The scope of effective magnetic field.

This utility model additionally provides a kind of chopper, including：There is the base of holder；Arc extinguishing equipped with multiple arc quenching plates Room, described arc-chutes include moving contact opening and are accommodated in described holder；Aforesaid static contact；And stretch into described Moving contact in the moving contact opening of arc-chutes, wherein, described moving contact is movably mounted with respect to static contact and includes dynamic touching Point, described movable contact is surrounded in the projection in described side of the arcuate in shape of at least one arch busbar described of described static contact Range of movement at least a portion.Preferably, institute is surrounded in the projection of the side in described static contact for the arcuate in shape of busbar State the overall range of motion of movable contact.May be interpreted as from stationary contact in being projected in some embodiments of the present disclosure of described side Side is seen, such as from side view.Described it is enclosed in the motion that can be construed to movable contact in some embodiments of the present disclosure Scope is in the arcuate in shape of busbar in the envelope of side projection.

A part for other features and advantages of the utility model would is that those skilled in the art upon reading this disclosure Obvious, another part will be described in conjunction with the accompanying in specific embodiment below.

Brief description

Hereinafter, to describe embodiment of the present utility model in detail in conjunction with accompanying drawing, wherein：

Fig. 1 is the axonometric chart of the embodiment of chopper of the present utility model；

Fig. 2 is the axonometric chart of the embodiment of chopper of the present utility model；

Fig. 3 is the axonometric chart of the embodiment of arc-chutes of the present utility model；

Fig. 4 is the axonometric chart of the embodiment of arc extinguishing external member of the present utility model, wherein according to this utility model embodiment Static contact is fixed on arc-chutes；

Fig. 5 is the axonometric chart of the embodiment of arc extinguishing external member of the present utility model further it is shown that moving contact；

Fig. 6 is the axonometric chart of the static contact of an embodiment of the present utility model；

Fig. 7 is the axonometric chart that the moving contact of this utility model embodiment, static contact and arc quenching plate match, not shown in it Arc-chutes；

Fig. 8 is the schematic diagram that the static contact shown in Fig. 7 causes magnetic blow-out effect；

Fig. 9 is the static contact of another embodiment of the present utility model and the axonometric chart of moving contact cooperation；

Figure 10 is that static contact and the moving contact of embodiment illustrated in fig. 9 are in the side view of separated position；

Figure 11 is that static contact and the moving contact of embodiment illustrated in fig. 9 are in the side view of engagement state；

Figure 12 is the axonometric chart of the static contact of embodiment illustrated in fig. 9.

Reference table

1st, chopper；202nd, terminals；

10th, arc extinguishing external member；203rd, arch busbar；

12nd, arc-chutes；2032nd, the first leg；

14th, arc quenching plate；2034th, the second leg；

120th, body；2036th, bridge-linking part；

122nd, end cap；204th, stationary contact support；

126th, moving contact opening；205th, striking corner fittings；

128th, air vent；206th, connecting portion；

1202nd, the first side wall；30th, moving contact；

1204th, second sidewall；40th, base；

20th, static contact；400th, holder.

200th, stationary contact；

Specific embodiment

Description, describes the signal of chopper disclosed in the utility model and its static contact and arc extinguishing structure in detail Property scheme.Although providing accompanying drawing to be to assume some embodiments of the present utility model, accompanying drawing need not be by specific embodiment party The size of case is drawn, and some features can be exaggerated, remove or office is cutd open preferably to illustrate and to explain public affairs of the present utility model Open content.Partial component in accompanying drawing can carry out position adjustment on the premise of not influence technique effect according to the actual requirements.? In description, the phrase " in the accompanying drawings " occurring or similar term need not be with reference to all accompanying drawings or examples.

Hereinafter be used for describe accompanying drawing some directional terminology, such as " interior ", " outward ", " top ", " lower section " and Other directional terminology are it will accordingly be understood that be to have its normal implication and criticize those directions when often seeing accompanying drawing involved.Remove Otherwise indicated, directional terminology described in this specification is substantially according to routine direction understood by one of ordinary skill in the art.In this public affairs In opening, unless otherwise stated, with stationary contact, the orientation as reference will so be orientated, and the part being contacted with movable contact is limited by stationary contact Make " top " or " top ", the side deviating from this " top " will for " bottom " or " bottom, " for example, and the top surface of stationary contact can be touched with dynamic Point engages, and the top of stationary contact can be supported by.Correspondingly, stationary contact can be dynamic to deviate from the extension side of moving contact as one end The extension side of contact, such as arc quenching plate side are the other end.Correspondingly, by stationary contact side, such as moving contact engages or disconnects stationary contact The side that may be interpreted as stationary contact of the plane of movement both sides of point.People are readily apparent that, arc-chutes can also be based on stationary contact and phase Should orient on ground, for example, there is bottom, the moving contact opening being located on two ends and air vent and an offside of neighbouring stationary contact Wall.

Term " first " used in this utility model, " second " and its similar terms, in this utility model not Represent any order, quantity or importance, but for making a distinction a part with other parts.

As shown in Figure 1-2, this utility model embodiment provides a kind of chopper 1, and this chopper 1 can be that plastic shell breaks Road device (MCCB).But it will be appreciated that, the chopper according to utility model embodiment can include miniature circuit breaker (MCB) or Frame-type circuit breaker (ACB it is also possible to referred to as universal circuit breaker or air-break).

With continued reference to Fig. 1-2, this chopper 1 includes the base 40 with least one holder 400, operating mechanism, stationary contact 20, moving contact 30, have arc-chutes 12 and the multi-disc arc quenching plate 14 being disposed therein arc extinguishing chamber device (also referred to as equipped with The arc-chutes 12 of arc quenching plate (group)) and trip gear (sign).Arc extinguishing chamber device can be contained in base 40, specifically It is accommodated in holder 400.As shown in Figure 1-2, operating mechanism can include the operation button (sign) positioned at its top, and By this operation button control operation mechanism and then the moving contact 30 of chopper 1 and opening and connecing of static contact 20 can be controlled Close.This chopper 1 can also include top cover (not shown) for the internal structure with base 40 mating protection chopper 1.

In the embodiments illustrated in the figures, base 40 has three holders 400, correspondingly to accommodate three arc extinguishing chamber devices (three arc-chutes 12 equipped with arc quenching plate).Correspondingly, in chopper 1 in the embodiments illustrated in the figures, there are three fixations To the static contact 20 of arc-chutes 12, and three moving contacts 30 matching with these three static contacts.But it will be appreciated that, open circuit Device can have different number of holder, arc extinguishing chamber device (arc-chutes and arc quenching plate group therein), moving contact and/or stationary contact Head, this falls in scope of the present utility model.

In conjunction with reference to Fig. 1-2 and Fig. 3-5, show the arc-chutes (device) according to this utility model embodiment, it can use In the chopper 1 according to this utility model embodiment.This arc extinguishing chamber device may include arc-chutes 12 and is located in arc-chutes 12 Multi-disc arc quenching plate 14 (also referred to as arc quenching plate group).Arc quenching plate 14 can be installed or integrally formed in any suitable manner (in an illustrated embodiment for plug-in mounting) is in arc-chutes 12.

With reference to Fig. 1-5 and referring especially to Fig. 3, described arc-chutes 12 include body 120 and plug-in mounting to the opening of body End cap 122.In an illustrated embodiment, body 120 can limit the first side wall 1202, second sidewall 1204, roof (are not marked Show), diapire (sign) and be located at end cap 122 opposite end on end wall (sign).Although showing in an illustrated embodiment Body and plug-in mounting are gone out to the end cap of body open end, it is envisioned that can have it according to arc-chutes of the present utility model Its structure.As an example and without limitation, body can be inserted in end cap, or some wall portions above-mentioned of body are limited by end cap Fixed, or even there is no end cap etc..With reference to Fig. 1-5 and referring especially to Fig. 3, arc-chutes 12 may include for inserting for moving contact 30 Enter the moving contact opening 126 of arc-chutes device and the air vent 128 discharging arc extinguishing chamber device internal gas after blow-out.Shown In embodiment, described moving contact opening 126 is arranged on end cap 122, and air vent 128 is arranged in body 120, specifically exists The top of the end wall of body.In some embodiments of the present utility model, end cap 122 may be configured to for example tightly plug-in mounting this In body 120, so that body 120 is mutually fixed with end cap 122.

With reference to Fig. 1-8, show the embodiment according to static contact 20 of the present utility model and moving contact 30.As it was previously stated, Moving contact 30 is stretched in arc extinguishing chamber device by moving contact opening 126, to be optionally switched on or switched off with static contact.Institute State static contact 20 and can be fixed to arc extinguishing chamber device, specifically arc-chutes 12 with formed knockdown arc extinguishing external member 10.Correspondingly as shown in figure 4, this utility model may also provide a kind of embodiment of arc extinguishing external member 10, this arc extinguishing external member can be wrapped Include arc-chutes 12 (and the arc quenching plate 14 of wherein installation and presumable air-blowing piece) and be fixed on the static contact 20 on arc-chutes. It is contemplated that can be provided with molectron form by manufacturer according to this arc extinguishing external member of this utility model embodiment, and coordinate Conventional or ad hoc moving contact and/or the miscellaneous part of conventional or ad hoc chopper.In embodiment of the present utility model and For example shown in Fig. 5, it is indoor and match with the static contact being fixed to arc-chutes that arc extinguishing external member 10 can also include stretching into arc extinguishing Moving contact 30.It is contemplated that can be carried with molectron form by manufacturer according to this arc extinguishing external member of this utility model embodiment For, and coordinate the miscellaneous part of conventional or ad hoc chopper.

With reference to Fig. 1-8 and with particular reference to Fig. 6, show according to an embodiment of the present utility model for chopper Static contact 20.This static contact 20 may include the stationary contact 200 for electrically connecting with the movable contact of moving contact 30；Outer for connecting The terminals 202 of portion's wiring；And electrically connect the arch busbar 203 of described stationary contact 200 and terminals 202.Arch is conductive Row 203 can be one or more.

In the preferred embodiment shown in the drawings, show a pair of arch busbar 203 with same shape, thus arch is led Electricity row 203 is located at the both sides of stationary contact 200.In an illustrated embodiment, arch busbar 203 has arch direction upward, Extend towards stationary contact towards the side of moving contact 30.Preferably, from the side, that is, the motion being approximately perpendicular to moving contact is put down Face is seen, a part for the range of movement of moving contact 30, preferably most of, be more preferably entirely located in busbar 203 arcuate in shape Around envelope in.It will be appreciated that, described envelope may include the scope surrounded in busbar inner side edge or conductive exclusive The scope surrounded in side.It will be appreciated that, the bottom of this many embodiment of arch busbar 203 is unlimited, can be by even The imaginary line connecing busbar two bottom is as bottom envelope.In embodiment as shown in figures 1-8, each busbar 203 may include First leg 2032 of neighbouring stationary contact, the second leg 2034 of neighbouring terminals and the bridge joint bridging this first and second leg Portion 2036.In embodiment shown in Fig. 1-8, this bridge part 2036 extends substantially horizontally.

In embodiment shown in Fig. 1-8, described arch busbar 203 is preferably configured as flat.Described in the disclosure Flat refer to busbar wholly or largely in the plane of plane of movement that is parallel or being in substantially parallel relationship to moving contact extend, and The plane that busbar has in this parallel plane extends size, and width is more than or is significantly greater than perpendicular to this parallel plane in other words Depth dimensions thickness in other words.Preferably, the width of busbar can be 2-10 times of thickness.

In conjunction with reference to Fig. 4-6, static contact 20 can be configured to be fixed to arc-chutes 12, for example to form aforesaid arc extinguishing set Part 10.In embodiment shown in Fig. 4-5, static contact 20 includes the arch busbar 203 described in a pair positioned at both sides.This is right Arch busbar can be fixedly clamped respectively to the first side wall 1202 of arc-chutes 12 and second sidewall 1204, so that stationary contact 200 are held stationary in arc-chutes 12.Thus, the stationary contact 200 in arc-chutes 12 can with by moving contact opening 126 movable contacts (sign) stretching into the moving contact 30 in arc-chutes 12 match, thus the electricity producing during the disjunction of sound contact It is indoor that arc is limited in arc extinguishing.In an illustrated embodiment, arch busbar 203 can be substantially along side wall 1202,1204 Edge extend.Thus, for example, in the embodiment shown in Fig. 5 and Fig. 6, the first leg 2032 of busbar 203 has coupling Meander-shaped in arc-chutes end cap 122 sidepiece.Preferably, the bridge-linking part 2036 of busbar 203 can have substantially matching in The flat shape at top side wall edge.Preferably, the second leg 2034 of busbar 203 also has meander-shaped, this indentation A part for shape is matched with the sidepiece of end wall.In the preferred embodiment shown, can be in the first side wall 1202 of arc-chutes 12 With the part edge of second sidewall 1204, such as at the sidepiece of end cap 122 and/or end wall, the limiting section of setting busbar.

With continued reference to Fig. 1-8 and referring especially to Fig. 6, according to the static contact 20 of this utility model embodiment may also include for The stationary contact support 204 of supporting stationary contact 200.In the embodiment shown in fig. 6, stationary contact support 204 is flat-shaped, and It is integrally connected with the busbar 203 of both sides, wherein in stationary contact support 204, connect the part of stationary contact and busbar 203 It is to extend towards moving contact direction.In an illustrated embodiment, static contact 20 may also include the striking of neighbouring stationary contact 200 setting Corner fittings 205.In an illustrated embodiment, striking corner fittings 205 is arranged on the rear side of stationary contact, that is, deviate from the side of moving contact, from And electric arc can be rapidly introduced into arc quenching plate 14 by this striking corner fittings 205.In a preferred embodiment, this striking corner fittings 205 is ferrum Base, that is, include iron or be made up of iron.

With continued reference to Fig. 1-8 and referring especially to Fig. 6, use be may also include according to the static contact 20 of this utility model embodiment The connecting portion 206 being integrally connected in a pair of conductive row 203 and terminals 202.Preferably, can be provided in connecting portion 206 Navigate to the detent in the positioning convex portion in arc-chutes 12 (sign).In preferred embodiment shown in Fig. 6, this is to leading Electric row, static contact support, connecting portion and terminals are integrally formed, and more preferably all-in-one-piece metal bending member, As all-in-one-piece (silver-plated) copper bar bending member.

Although being not bound by the restriction of opinion, with particular reference to Fig. 4-5 and Fig. 8, describe as an example and without limitation according to this The embodiment of utility model is compared to the advantage of correlation technique.It will be apparent to one skilled in the art that following have the technical effect that signal Property, and some embodiments of the present utility model or scheme can have wherein at least one effect or advantage, but need not have All following effects.

For example, busbar arch upward towards moving contact side, the structure of preferred envelope moving contact range of movement can be formed very strong equal The effective magnetic field of even distribution, so that the Lorentz force that electric arc is subject to points to arc quenching plate, thus obtaining reliable and stable magnetic blow-out Effect, shortens the arc time, improves the arc extinguishing ability of arc-chutes, realizes the higher disjunction index of chopper.This is not only substantially excellent The stationary contact head structure that bottom side extends in such as correlation technique, and be also significantly better than because using magnetized stalloy or permanent magnetism The correlation technique of body, for example, provide much bigger Lorentz force.It is additionally, since busbar when AC current direction changes Produce corresponding magnetic field, thus magnetic blow-out direction is not affected by the sense of current, from regardless of whether the sense of current how electric arc is subject to Lorentz force always points at arc quenching plate, the static contact thus according to this utility model embodiment cannot be only used for direct current it is also possible to In AC circuit breaker.And it is not used to the AC circuit breaker of alternating current using the correlation technique of permanent magnet.In addition, for example comparing In the correlation technique of magnetized stalloy or permanent magnet, function is greatly reduced according to the static contact of this utility model embodiment Part, structure is simpler, achieves that magnetic blow-out function merely with the conductive static contact structure of itself, and magnetic blow-out effect and event Barrier current value is directly proportional, with more effectively breaking arc.Referring especially to Fig. 8, schematically illustrate to be implemented according to this utility model The structure of the static contact 20 of example produces Lorentz force, and then the effect of electric arc magnetic blow-out.

In the embodiment shown in fig. 8, now there is anticlockwise electric current in static contact 20, and moving contact 30 He The electric current of the electric arc between static contact 20 is generally downward, produces the inside magnetic field of paper based on the right-hand rule, then is based on left hand Rule and to electric arc produce towards arc quenching plate 14 direction Lorentz force F, thus causing electric arc magnetic blow-out.If for example because of alternation Produce inverse current, then there is clockwise electric current in static contact, and the electric current of the electric arc between moving contact and static contact For generally upwards, the outside magnetic field of paper being produced based on the right-hand rule, then based on left hand rule, electric arc generation still court is gone out The Lorentz force in arc piece 14 direction, thus cause electric arc magnetic blow-out.

In addition, still as shown in figure 8, in the case that stationary contact is connected with movable contact, moving contact be subject to simultaneously Huo Muli with And the Lorentz force that magnetic field produces, thus when fault current occurs, larger electric repulsion F can be produced₁, can scold moment start tactile Head, limits electric current and rises, possess reliable current limiting capacity, realize quick disjunction.

Especially as shown in Figure 4 and Figure 5, the flat sheet structure of arch busbar can minimize or will not take arc-chutes Structure space, thus be conducive to obtain arc quenching plate quantity maximize and arrangement mode optimization.Meanwhile, although intuition arch Shape busbar (as the structure division of static contact) looks and brings the factor being unfavorable for increasing material, but inventor makes us It has surprisingly been found that busbar is amassed with air contacting surface increasing, quick heat radiating, lower temperature rise, to chopper or its arc quenching system Bring relatively more favourable advantage, and others discussed above advantage.

With reference to Fig. 9-12, show the static contact 20 according to another embodiment of the present utility model, this static contact 20 also may be used It is configured to match with moving contact.With the static contact embodiment shown in Fig. 6-8, this embodiment is differing principally in that arch is conductive Row's 203 shape and the shape of stationary contact support 204.In the embodiment of the static contact shown in Fig. 9-12, arch busbar The bridge-linking part 2036 of 203 first legs 2032, the second vertical leg 2034 and level with complications.Such arch is conductive Row 203 for example can be adapted to heteroid arc-chutes, to be for example configured to arc extinguishing external member.Compared to flat-shaped shown in Fig. 6-8 Stationary contact support, the static contact 20 shown in Fig. 9-12 has the stationary contact support 204 of U-shaped, and specifically this U-bend folding is first Extend towards moving contact direction, and down, towards away from the back bending of moving contact direction, that is, U-shaped bending structure opening is towards terminals 202, thus having the mistake between first extension and the second extension in bottom and two extensions of neighbouring moving contact Cross portion.Although showing seamlessly transitting of U-shaped, it is contemplated that straight or angular transition.

Above description, as preferred embodiment of the present utility model, is not limited to this utility model.For this area Technical staff for, this utility model can have various modifications and variations.All of the present utility model spirit and principle within, Any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.To the system and The above description of method should be read to include the combination of whole new and non-obvious element described herein, and this There may be the claim of the combination being related to any new and non-obvious element in application or subsequent application.Additionally, on It is exemplary for stating embodiment, in the whole possible combination that may require that protection in the application or subsequent application, does not have One single features or element are requisite.

Claims (10)

1. a kind of static contact, is characterized in that, including：For the stationary contact with the movable contact electrical contact of moving contact；Terminals；And Electrically connect at least one arch busbar of described stationary contact and described terminals, at least one arch wherein said is conductive to be ranked In the side of stationary contact and arch direction extends towards moving contact side, the arcuate in shape of at least one arch busbar described is in institute Described stationary contact is surrounded in the projection stating side.

2. static contact according to claim 1, is characterized in that, at least one arch busbar described has in described stationary contact The flat plate shape that the side of point extends.

3. static contact according to claim 1 and 2, is characterized in that, is pointed to the described of described stationary contact both sides including one Arch busbar.

4. static contact according to claim 3, is characterized in that, wherein said arch busbar is of similar shape.

5. static contact according to claim 3, is characterized in that, also includes stationary contact support, and wherein said stationary contact props up Bearing portion electrically connects this to arch busbar, and wherein said stationary contact support is at least partially situated at stationary contact adjacent to moving contact One end.

6. static contact according to claim 5, is characterized in that, this is to arch busbar, described stationary contact support and institute Stating terminals is all-in-one-piece metal bending member.

7. static contact according to claim 5, is characterized in that, the drawing of the iron-based being additionally included on described stationary contact support Arc angle part, described striking corner fittings is arranged on one end that stationary contact deviates from moving contact.

8. a kind of arc extinguishing external member, is characterized in that, including：

Arc-chutes, including moving contact opening, air vent, the first side wall and second sidewall；

It is contained in the indoor multiple arc quenching plates of arc extinguishing；

Static contact according to any one of claim 3 to 7,

Wherein this is fixedly clamped to described the first side wall and second sidewall respectively to arch busbar, thus described stationary contact is protected Hold and be fixed on described arc extinguishing interior.

9. arc extinguishing external member according to claim 8, is characterized in that, this is to arch busbar at least in part along described first The edge of side wall and second sidewall extends.

10. a kind of chopper, is characterized in that, including：

There is the base of holder；

Equipped with the arc-chutes of multiple arc quenching plates, described arc-chutes include moving contact opening and are accommodated in described holder；

Static contact according to any one of claim 1 to 7；And

Stretch into the moving contact in the moving contact opening of described arc-chutes, wherein, described moving contact is movable with respect to static contact Ground is installed and is included movable contact, and the arcuate in shape of at least one arch busbar described of described static contact is in described static contact At least a portion of the range of movement of described movable contact is surrounded in the projection of side.