CN1279495A - Electric circuit breaker - Google Patents

Abstract

In a electric circuit breaker, two exhaust holes 110, 109 are separately formed upside and downside in the height direction of the apparatus body 1, for discharging arc gas generated, when the contacts of two poles mounted in the apparatus body are separated from a each other. It is difficult to occur interelectrode short circuit even if the arc achieve to the outside of the apparatus body.

Description

Circuit-breaker

The present invention relates to form the circuit-breaker of when various contacts force to disconnect, discharging two steam vents of the arcing gas that is produced respectively.

The sort circuit circuit breaker is opened flat 11-No. 670496 the Japanese patent gazette spy and is gone up open.This circuit-breaker is to be set up in parallel contact, the two poles of the earth on the Width of device main body inside in described device main body, in a side of device main body in being set up in parallel on the Width when various contacts force to disconnect, discharge the steam vent of the arcing gas that is produced respectively, so that various electric arc is difficult to mix in device main body.

Yet above-mentioned circuit-breaker is to be set up in parallel steam vent on the Width of device main body, and the electric arc that therefore meets multipole generation device main body occurs when outer, probably mixes easily and is short-circuited in that device main body is outside.

The present invention finishes in view of the above-mentioned origin of an incident, and its purpose is, even provide a kind of electric arc the circuit-breaker of intereelectrode short-circuit to occur also being difficult to the outside of device main body.

The first invention circuit-breaker of the present invention, two fixed contacts that comprise fastening fixed contact, fastening and described each fixed contact break-make is two movable contacts of the moving contact of subtend freely, operation freely keeps the switching mechanism of these two movable contacts, include the handle that makes described each moving contact and each fixed contact break-make by this switching mechanism, with can keep this handle and form to discharge the device main body of two steam vents of the arcing gas that described each moving contact produced when described each fixed contact is left from peripheral operation, it is characterized in that, in the short transverse of described device main body, form described steam vent at two sections.

Second invention of the present invention comprises first invention, it is characterized in that, the outer peristome of described each steam vent is to form with the angle that is separated from each other.

The 3rd invention of the present invention, comprise first or second invention, it is characterized in that, on the Width of described device main body, be set up in parallel described each moving contact and each fixed contact, while is in the short transverse of described device main body, in configuration up and down, the next door member of isolating described each fixed contact is set, separately leave described each moving contact and fixed contact in separated two zones by two side on the described device main body Width and next door member, in one zone, above described device main body, form the steam vent of epimere moving contact and fixed contact, in another zone, below described device main body, form the steam vent of hypomere moving contact and fixed contact simultaneously.

The 4th invention of the present invention, comprise the 3rd invention, it is characterized in that, described next door member is included between each fixed contact described device main body sidewall is slightly extended in parallel, and with the described device main body sidewall of epimere fixed contact side together with the longitudinal wall part of epimere fixed contact harvesting, with lower end from this longitudinal wall part, slightly extend in parallel with the bottom surface of device main body, and with the sidewall of the described device main body of hypomere fixed contact side together with the cross wall portion of the conductor coupling portion harvesting of hypomere fixed contact, and near the beginning fixed contact of the fixed contact of epimere to the sidewall direction bulging of the described device main body of hypomere fixed contact side and the bulge that contacts with the described device main body sidewall of hypomere fixed contact side; By the two side of described cross wall portion and bulge and described device main body, harvesting is across the fixed contact of the hypomere fixed contact between the two side of described device main body.

The 5th invention of the present invention comprises the 4th invention, it is characterized in that, described switching mechanism comprises is gone into each movable contact and have a door bolt free to rotate with the grooving of each regional connectivity by the horizontal respectively intercalation in both sides; On the two side of described next door member and described device main body, be provided with the spacer of the front end face of the moving contact side of under described each moving contact leaves the form of each fixed contact, touching described door bolt.

The 6th invention of the present invention comprises the 5th invention, it is characterized in that, concavo-convex locking part is set on the front end face of described spacer and door bolt.

The present invention's the 7th invention comprises the 3rd to the 6th invention, it is characterized in that described next door member is to be made by the material of the hydroxide of alkaline including earth metal.

Below accompanying drawing and individual symbols thereof are done simple declaration.

Fig. 1 is a front view of the present invention.

Fig. 2 is the same exploded perspective view.

Fig. 3 is the same end view.

Fig. 4 is A-A cutaway view of the same Fig. 3.

Fig. 5 is B-B cutaway view of the same Fig. 3.

Fig. 6 is C-C cutaway view of the same Fig. 3.

Fig. 7 is the same stereogram.

Fig. 8 is the same vertical view.

Fig. 9 is the same upward view.

Figure 10 is the same rearview

Figure 11 is the same middle casing amplification stereogram.

Figure 12 is part abridged, the position amplification stereogram of fastening with a bolt together.

Figure 13 is the same upside electromagnetic drive part and the exploded perspective view of upside bimetal leaf structure position.

Figure 14 is the same upside electromagnetic drive part and the stereogram of upside bimetal leaf structure position.

Figure 15 is the same downside electromagnetic drive part and downside bimetal leaf structure position exploded perspective view.

Figure 16 is the same downside electromagnetic drive part and the stereogram of downside bimetal leaf structure position.

Figure 17 is that the same bimetal leaf is adjusted key diagram.

The amplification stereogram that Figure 18 omits and analyses and observe for the part that the same upside steam vent of explanation formation is used.

Figure 19 is the end view of the same component-assembled form to first side body.

Figure 20 is the form key diagram of the same arrangement for closed configuration.

Figure 21 is the form key diagram to the same disconnection form transition.

Figure 22 is the form key diagram of the same disconnection form.

Figure 23 is for to take off shown disconnection form key diagram under the same form of separating buckle.

The form key diagram that Figure 24 trips and moves for the same overload current.

Figure 25 causes moment to disconnect the form key diagram of form for the same by overload current.

In above-mentioned accompanying drawing, 1-device main body, 1A-first side body, 1B-second side body, 109,110-steam vent.

Embodiment

Below in conjunction with accompanying drawing 1 to accompanying drawing 19 embodiment is described

The circuit-breaker of present embodiment as shown in Figure 2, comprise fastening fixed contact 2A, two fixed contact 12A of 2B, 12B, but be fastened with break-make freely with respect to each fixed contact 2A, two movable contact 3A of the moving contact of 2B, 3B, operation keeps the switch 5 of these two movable contacts freely, on the short transverse of device main body 1, make each travelling contact and each fixed contact 2A by this switching mechanism 5 in two sections formation up and down, the handle 6 of 2B break-make, keep this handle 6 with operating, discharge described each moving contact 3A simultaneously by the outside, 3B leaves each fixed contact 2A, two steam vents 110 of the arcing gas that is produced during 2B, 109.

Also have, be equipped with in by the first side body 1A of synthetic resin manufacturing and the superimposed device main body that constitutes 1 of the second side body 1B: two fixed contact 2A, 2B being set up in parallel at Width along device main body 1 in both sides; Subtend these each fixed contact 2A, 2B's, connect, disconnect freely moving contact 3A, 3B; Two movable contact 4A, the 4B of fastening moving contact 3A, 3B; With the switching mechanism 5 that drives these two movable contact 4A, 4B.Make each moving contact 3A, 3B connect, disconnect each fixed contact 2A, 2B, by switching mechanism 5 at short transverse upper and lower settings each fixed contact 2A, 2B and movable contact 4A, the 4B of device main body 1 by handle 6 switching manipulations.Simultaneously in two movable contact 4A, 4B, leaving under the form of each moving contact 3A, 3B by each fixed contact 2A, 2B, it seems that from the cross direction of device main body 1 Uncrossed height and position is provided with, in short transverse, a movable contact 4B is set between two fixed contact 2A, 2B and connects, disconnect the fixed contact 2A of the moving contact 3A of another movable contact 4A.

Then, be provided with the next door member (to call middle casing in the following text) 7 that alkaline including earth metal oxide (as magnesium hydroxide) synthetic resin material forms in an end inside of device main body 1, sandwich between two housings 1A, the 1B, in the zone that the longitudinal wall part 35 of recess 8 inboard by the sidewall (outer wall) of the first side body 1A and middle casing 7 constitutes, the conduct that harvesting at one end is provided with fixed contact 2A constitutes the terminal block 10A of the first fixation side circuit; In the zone that the sidewall (outer wall) of the recess 9 that is provided with by the second side body 1B side of middle casing 7 and the second side body 1B constitutes, harvesting have at one end be provided with fixed contact 2B, as the terminal block 10B that constitutes the fixation side circuit.

Its formation of terminal block 10A comprises: the terminal board 11 that is the bending of " コ " shape; By an end of 11 times sheets of this terminal board whole upward prolong and from this upper end that prolongs sheet 11a to prolonging sheet 11a right-angle bending to the outwards whole fixed contact 12A that prolong of terminal board 11; The fixed contact 2A of riveted and fixed on the end of this fixed contact 12A; On following of terminal board 11 mounting, receive and keep the latch spring 13A of " Si " font of roughly being in terminal board 11.On the downward-sloping bottom surface of the recess 8 of the described first side body 1A, be provided with following of load terminal daughter board 11, along the prolongation sheet 11a of the wall 8a of recess 8 one ends; Fixed contact 12A in the upper end that will cross wall 8a, between wall 8a that outside recess, derives and the next door 14 that erects by the bottom of the first side body 1A, in the same integrally formed fixed contact configuration portion 15 of tilting in the bottom of recess 8, the front portion of fixed contact 12A is set, terminal block 10A is arranged in the recess 8 (as shown in figure 19).At the recess 15a of fixed contact configuration portion 15 formation to the downside lower end that protrude, that miss fixed contact 2A of fixed contact 12A.Terminal board 11 forms T word slice 11b by upwards whole prolongation of last slice the other end, is positioned at the upper surface of protruding flat portion 22 of the medial surface of the first side body 1A in formation, the sheet side front end of the side protuberance of the upper end of this T word slice of mounting 11b.And, the whole projection 23 that forms in the presser blade 13b that inserts latch spring 13A, prevents latch spring 13A shakiness in the side of the lateral plate of terminal board 11.

Because latch spring 13A and terminal board 11 are the quick connection terminals that are enough to constitute conductor coupling portion, when the first side body 1A was overlapped middle casing 7, the section that forms in the longitudinal wall part of the other end of the first side body 1A was that the downward-sloping groove 160 of the same shape shape that forms by semicircular downward-sloping groove 160 with at the subtend wall of middle casing 7 forms; By downward-sloping electric wire insertion holes 16A, the heart yearn of the electric wire 111 (with reference to Fig. 1) that will insert by the outside be pressed into terminal board 11 last slice and the upper end of the upper end of the grip tab 13a of latch spring 13A and presser blade 13b between, by the front end snap close of grip tab 13a the heart yearn of drawing direction with respect to electric wire, and, by with the upper surface of presser blade 13b with heart yearn be pressed in terminal board 11 last slice, when being electrically connected heart yearn, mechanically maintain.Removing this electric wire snap close is with removing the rotation axis 18 that handle 17 is provided with in these releasing handle 17 lower side, rotate in the axis hole 20 that is provided with in the protruding flat portion 22 of the medial surface that is supported in the first side body 1A freely, and the axle 36 of the wall of the longitudinal wall part 35 of the protrusion middle casing 7 that is provided with in the another side, bottom rotates in the recess 37 of the another side setting that is supported in the bottom freely, in Figure 19, the operating portion 17a in device main body 1 outside is exposed in manual operation, make it when counter-clockwise direction is rotated, the driving projection 19 that the lower end is provided with is pushed the front portion of a side of the grip tab 13a of latch spring 13A, make grip tab 13a bending, can remove snap close heart yearn.Among the figure 21 is the back-moving springs when removing the rotation of handle 17 clockwise directions.

On the other hand, terminal block 10B is by constituting with the same terminal board 11 of basic terminal block 10A and latch spring 13B and fixed contact 12B, the terminal board 11 of different with the terminal board 11 of terminal block 10A is terminal block 10B be by its down an end of sheet prolong the prolongation sheet 11c that forms downwards, prolong abreast by its bottom that prolongs the front end of sheet 11c and device main body 1 and to form fixed contact 12B, and, by an end of the lateral plate of terminal board 11 form that the right angle prolongs in sheet 11d.

Latch spring 13B is identical with the structure of latch spring 13A, is positioned on following of terminal board 11, inserts the projection 23 that the lateral plate by terminal board 11 protrudes in presser blade 13b.

This terminal block 10B prolongs following of mounting terminal board 11 in the cross wall portion 24 that forms at the bottom almost parallel with the device main body 1 of recess 9 bottoms that constitute middle casing 7, simultaneously the longitudinal wall 25 of an end of recess 9 along the lower end of the longitudinal wall 25 of lining sheet 11d and and an end of cross wall portion 24 between inlay an end of terminal board 11 on the breach 27 that forms, to prolong sheet 11c stretches out outside recess 9, when the first side body 1A, one side superimposed middle casing 7, flange 26 in the bottom of the first side body 1A, the front portion of mounting fixed contact 12B on 26, just be provided with fixed contact 2B below.That is to say,, cross between two housings 1A, 1B fixed contact 2B is set with the cross wall portion 24 of middle casing 7 and bulge described later 30 and the space that between the sidewall of two housings 1A, 1B, constitutes.Also have, the recess that flange is 26,26 is to be the bottom that a side is protruded below the fixed contact 12B of the fixed contact 2B of the anterior riveted and fixed of fixed contact 12B of staggering.

And, the front end that prolongs the side protuberance of the upper end that forms T word slice 11b upward by last slice the other end of terminal board 11 be set at the protruding flat portion 22 of the wall that forms middle casing 7 ' the upper surface.

The latch spring 13B of terminal block 10B connects terminal with the speed that terminal board 11 constitutes the conductor coupling portion identical with terminal block 10A situation, when the second side body 1B overlaps middle casing 7, the groove 160 that the section semicircular in shape that is provided with on the longitudinal wall part of the other end of the recess 9 of middle casing 7 is downward-sloping and using and this downward-sloping groove 160 downward-sloping groove 160 formed electric wire insertion holes 16B of being provided with of the longitudinal wall in the other end of the second side body 1B equally, with the grip tab 13a snap close of latch spring 13B insertion electric wire and its heart yearn from electric wire insertion holes 16B, with presser blade 13b with heart yearn be crimped on terminal board 11 last slice, when being electrically connected electric wire, its mechanical lock is fastened.

With the releasing handle 17 of removing this electric wire snap close ' the axis hole 20 of protruding flat portion 22 ' settings of middle casing 7 rotate support freely this releasings handle 17 ' with above-mentioned releasing handle 17 same rotation axiss 18 in the lower side setting, and be bearing in the axle 38 of side formation freely to the medial surface protrusion of the second side body 1B in recess 37 rotations, when the operating portion 17a that exposes device main body 1 outside in manual operation rotates it, the driving projection 19 that is provided with in the lower end can be pushed down the front portion of a side of the grip tab 13a of latch spring 13B, make grip tab 13a lax, remove the snap close form.Among the figure 21 ' be move in the direction of the clock remove handle 17 ' back-moving spring.

Middle casing 7 is formed on the second side body 1B side of bulge 30 as shown in Figure 11 the sidewall that is roughly parallel to two housings 1A, 1B protrudes, connects the side wall inner surface of the second side body 1B to to(for) longitudinal wall part 35, than more sagging wall below this bulge 30 is described longitudinal wall 25, and sidewall, diapire 31, the longitudinal wall 32 of an end and the recess of using towards the second side body 1B side 34 that roof 33 surrounds is set in the first side body 1A side.Then in the first side body 1A side when butt joint during middle casing 7, on the section face 31a of the bottom 31 of recess 34, be positioned in the front end sidepiece of fixed contact 12A of the terminal block 10A of first side body 1A side assembling, and the following configuration roof 33 of the cross wall 29 that more protrudes than the medial surface of the first side body 1A.Form the groove 31b of bottom of the fixed contact 2A of the riveted and fixed fixed contact 12A that staggers at section face 31a.And form in order in recess 34, to insert the free-ended peristome 39 of the movable contact 4A of corresponding fixed contact 2A at longitudinal wall 32.

Have again, the switching mechanism 5 of switch drive movable contact 4A, 4B be by working plate 43 that is equivalent to Hook member and door bolt part 40 and have sealed working plate 43 an end section shape locking part 57 first separate the formations such as connecting rod 44 that buckle 41 and second is separated the working plate 43 of buckle 42, locking member, handle 6 and " コ " font, when these being applied the overload current detection, two bimetal leafs 45,46 of driving switch mechanism 5, particularly when short circuit current flows through, the common member that the electromagnetic drive part 47,48 of additional drives switching mechanism 5 constitutes.

Handle 6 is made of operating portion 6a and rotation section 6b and Handle axis 6c, the Handle axis 6c that the central authorities of the two sides of rotation section 6b are protruded rotates axis hole 49 that the medial surface that is inserted in the 1st side body 1A freely forms respectively and between axis hole 49 that the medial surface of the 2nd side body 1B forms and the two housings 1A, the 1B that remain on, operating portion 6a is the fenestra 50 that faces opening above the device main body 1 that constitutes under the superimposed form of two housings 1A, 1B.Also have, at Handle axis 6c torsionspring 51 is installed, by this torsionspring 51, handle 6 relies on the pass direction of operating at ON operation position (with reference to Figure 22).

The lower end of rotation section 6b be provided with in the axis hole 52 rotate insert freely connecting rod 44 on side shaft 44a, connect working plates 43 by connecting rod 44.

Working plate 43 is to pass through the following side shaft 44b that inserts connecting rod 44 at the dead eye 43a that central both sides are provided with, and connects handle 6 by connecting rod 44 thus, moves up and down to be configured in freely in the device main body 1.

Door bolt 40 is the axle 40a that insert the two sides of protruding top on the medial surface of two housings 1A, 1B in the axis hole 52,52 that forms, be the member that is supported between two housings 1A, the 1B, than axle 40a shown in Figure 12 slightly the sidepiece setting of the first side body 1A side of below embed the grooving 54 of movable contact 4A and embed the grooving 55 of movable contact 4B in the sidepiece setting of the second side body 1B side of bottom from transverse direction from transverse direction.Then in the moving contact side end face, the inner face protrusion that each moving contact 3A, 3B lock under the form of leaving each fixed contact 2A, 2B to the sidewall of middle casing 7 and two housings 1A, 1B is provided with spacer 130, forms the groove 131 that is connected with its bottom at Width.

Here, movable contact 4A is that the conductive metal sheet by rigid body constitutes, insert the grooving 54 of door bolt 40 by side direction, while is at the recess 54a that is provided with later of grooving 54, by the coil spring 53 of pressing usefulness that connects of compressed configuration between the bottom of back basifacial and recess 54a, the rear portion relies on the top, when door bolt 40 is the center rotation with axle 40a, make corresponding moving contact 3A in the free end riveted and fixed, to fixed contact 2A from, close.

And, movable contact 4B is made of conductivity spring light sheet, when door bolt 40 counter-clockwise direction in Figure 19 is rotated, press to the below and make its bending, when being rotated along clockwise direction by this bending shape, door bolt 40 resets, with its crooked with reset, the moving contact 3B that makes in the front end riveted and fixed, to fixed contact 2B from, close.

Door bolt 40 bottom is pushed down by the helical spring 62 that is compressed configuration between this bottom and the wall 63 that stood by the bottom of the first side body 1A, and it is last with clockwise direction rotatory force among Figure 19 it to be leaned on.

First to separate buckle 41 be by axial region 41a, protrude the protuberance 41b on this axial region 41a top, near the second side body 1B side of axial region 41a and the side band part 41c that axial region 41a has the face of intersecting vertically, and constitute to the whole extended transverse arm sheet 41d of an end by the upper end of this side band part 41c, be the two ends of insertion axial region 41a in the axis hole 56,56 that the medial surface of two housings 1A, 1B is provided with, between two housings 1A, 1B, rotate supported freely member, form the locking part 57 that lock takes off an end (right-hand member of Figure 19) of working plate 43 in the upper end of protuberance 41b.Also have, form the support part 88 of the drive division 58a that pushes the movable core 58 that drives electromagnetic drive part 47 in the upper front end of transverse arm sheet 41d.And, the second side body 1B side in side band part 41c bottom, formation is provided with the locking part 61 at the two ends of the torsionspring 60 that is locked together in axial region 41a embedding ring portion by being arranged on the support part 59 that second 42a of subtend portion that separates the bottom end face of buckle 42 pushes driving in the side of this support part 59.And, the lower end of the bimetal leaf 45 that subtend hangs down by the fixing conductive plate 71 that keeps electromagnetic drive part 47, first drive division 69 that is pressed when bimetal leaf 45 bending deflections are set in the first side body 1A side of side band part 41c bottom.

Insert the second axis hole 42b that separates the central portion of buckle 42 towards the first side body 1A medial surface near near the axis body 66 of the central portion setting of the end face of the integrally formed separates walls 65 that is equivalent to the next door bottom upside of the first side body 1A, be between two housings 1A, 1B, to rotate supported freely member, the support part 68 that the drive division 67a of the movable core 67 of electromagnetic drive part 48 is pressed and drives be set in the lower end surface of the opposite side of the above-mentioned 42a of subtend portion.And, the upper end of the bimetal leaf 46 that subtend stands by the fixing rearward end that keeps the movable contact 4B of electromagnetic drive part 48 is set, the 2nd drive division 70 that when bimetal leaf 46 bending deflections, is pressed in second side of the first side body 1A side of separating the upper end of buckle 42.

The conductive plate 71 that is made of the thin-sheet metal material is formed L shaped as shown in figure 13 by warpage, at the fixing electromagnetic drive part 47 that keeps of its outer plate 71a, fixedly fall the transverse sheet of L shaped portion in the upper end of bimetal leaf 45 in the section face welding of the front end bottom of the parallel interior sheet 71b of the outer plate 71a that turns back with front end U-shaped, bimetal leaf 45 is hung down by outer plate 71a.

Electromagnetic drive part 47 is by falling L shaped warpage magnetic iron plate as shown in figure 13, the two side ends of right angle its vertical plate of warpage, horizontal profile is the fixed iron core 74 of " コ " font, with movable core 58 with shake the flat spring 73 that subtend freely supports movable core 58 at the two ends of fixed iron core 74 magnetic pole strength and constitute.Between outer plate 71a and interior sheet 71b, insert by the flat board 75 that constitutes with fixed iron core 74 rectangular integrally formed horizontal plates, by at the recess groove 75a of the central portion of dull and stereotyped 75 both side edges in conjunction with the inverted T-shaped sheet 76 that the central portion by the both side edges of outer plate 71a hangs down, on conductive plate 71 as shown in Figure 14, fixedly be maintained fixed iron core 74.

Movable core 58 is inserted in this projection 58b, 58b at the projection 58b, the 58b that form to protrude this face on the face of fixed iron core 74 1 sides hole 73b, the 73b that the upper end of the central plate 73a of flat spring 73 forms, by riveted and fixed, shake supporting bracket spring 73 freely.Flat spring 73 is configured in two lateral plate 73c, the 73c of the two side flexagons one-tenth of central plate 73a along the outside of two lateral plate 74a, the 74a of fixed iron core 74, by recess 74b, 74b in the formation of the bight, the outside of fixed iron core 74, the front end that is locked together in two lateral plate 73c, 73c is to projecting inward locking piece 73d, 73d, fixedly to be maintained fixed unshakable in one's determination 74.

The magnetic pole strength of the front end of two lateral plate 74a, the 74a of fixed iron core 74, subtend is by the central plate 73a of flat spring 73 and the movable core 58 between two lateral plate 73c, the 73c, when the such super-high-current of conductive plate 71 short circuit current flow, the magnetic force that the magnetic pole strength of two lateral plate 74a, 74a by fixed iron core 74 produces, movable core 58 is shaken in attraction, and the drive division 58a that protrudes a side that is located at movable core 58 is moved.

Also have, screw in to the screw 76 that is arranged on dull and stereotyped 75 central authorities by the inserting hole 72 of the outer plate 71a of conductive plate 71 and to adjust screws 77, make the transverse sheet of the upper end font of the falling L portion of its front end subtend bimetal leaf 45 by interior sheet 71b, adjust screw 77 by precession, make interior sheet 71b bending, can adjust the initial position (with reference to Figure 17) of bimetal leaf 45 lower ends.

Lower end at the vertical plate 71c of conductive plate 71, weld clip is held in joins the contact rod that sets in the dish (not having diagram) cutter and holds spring portion 78, and, on by the lower end of the bimetal leaf 45 plate face above slightly, be welded on the other end of classification track 79 of the end welding of movable contact 4A, be electrically connected cutter and hold the 78A of spring portion, conductive plate 71, bimetal leaf 47, classification track 79 and movable contact 4A.

On the other hand, the movable contact 4B of fixing maintenance electromagnetic drive part 48 as shown in figure 15, rearward end taken the shape of the letter U as outer plate turn back, form the interior sheet 80 of parallel rearward end, the lower end of the section face mounting bimetal leaf 46 of the upper front end of sheet 80 is the transverse sheet of L font folding part in this, and the fixing bimetal leaf 46 of welding is stood.

Electromagnetic drive part 48 forms the shape shape identical with above-mentioned electromagnetic drive part 47, be by fixed iron core 74 ', flat spring 73 ' and movable core 67 constitute, be inserted between the rearward end of movable contact 4B and the interior transverse sheet 80 fixed iron core 74 ' on integrally formed dull and stereotyped 75 ', by to dull and stereotyped 75 ' the T shape sheet 76 that stands by the central portion of the both side edges of the rearward end of movable contact 4B of the recess groove 75a ' combination of central portion of both side edges ', fixed iron core 74 ' in the maintenance that is fixed as shown in Figure 16 of the rearward end of movable contact 4B.

The projection (not having diagram) of the interior insertion movable core 58 of hole 73b ', 73b ' that forms in the upper end of the central plate 73a ' of flat spring 73 ' protrude towards the face of fixed iron core 74 ' one sides, by riveted and fixed, shake be supported on freely flat spring 73 ' on.Flat spring 73 ' be along fixed iron core 74 ' the outside of two lateral plate 74a ', 74a ' be configured in two lateral plate 73c ', the 73c ' that the both sides warpage of central plate 73a ' forms, by fixed iron core 74 ' bight, the outside recess 74b ', the 74b ' that form be locked together in the locking piece (do not have diagram) of the front end of two lateral plate 73c ', 73c ' to projecting inward setting, fixed iron core 74 is fixedly maintained.

By fixed iron core 74 ' the magnetic pole strength of front end of two lateral plate 74a ', 74a ' be by flat spring 73 ' central plate 73a ' and the gap of two lateral plate 73c ', 73c ', subtend movable core 67, when the such super-high-current of short circuit current flows through movable contact 7B, fixed iron core 74 ' the magnetic attraction that produces of the magnetic pole strength of two lateral plate 74a ', 74a ' shake movable core 67, make movable core 67 ' a side end face protrude the drive division 67a that is provided with and move.

By the inserting hole 81 that is provided with in the rearward end of movable contact 4B will adjust screw 77 ' from below screw in dull and stereotyped 75 ' central authorities' setting screw 76 ', make the transverse sheet of the lower end L font portion of its front end subtend bimetal leaf 46 by interior sheet 80, adjust screw 77 by precession, make interior sheet 80 bendings, can adjust the upper end position (with reference to Figure 17) of bimetal leaf 46.

On than the upper end of the bimetal leaf 46 plate face below slightly, welding is held spring 78 identical accompanying with above-mentioned cutter and is arranged on the other end that the interior cutter of leading interior torch (not having diagram) of distribution board holds the classification track 82 of spring portion 81 1 ends welding, is electrically connected cutter and holds spring portion 81, bimetal leaf 46, movable contact 4B.Also have, cutter holds spring portion 81 and is stored in the frame section 83 that is made of synthetic resin formed product.

So, when assembling the circuit-breaker of present embodiment, at first,, pack into together in company with back-moving spring 21 at assigned position simultaneously and remove handle 17 at the recess 8 harvesting terminal block 10A of the first side body 1A.Also have, in company with torsionspring 51 handle 6 is installed together at assigned position, especially, the cutter that is provided with in bottom, an end shown in Figure 19 holds spring portion storage portion 90 harvesting cuttves and holds spring 78, vertical sheet 71c at 91,92 along the next door of the first side body 1A L shaped gap configuration conductive plates 71, the top parallel outer plate 71a of configuration simultaneously and the last cross wall 92a of portion in next door 92, the left side wall (Figure 19) of the separates walls 65 that forms at the flat inner face of the side of the first side body 1A disposes electromagnetic drive part 47 and bimetal leaf 45.At this moment determine the semicircular flange 103 that the medial surface of the position of outer plate 71a of conductive plate 71 and the flexing portion internal ratio first side body 1A that is bumped at the U of interior transverse sheet 71b font of decision protrudes.

Then, rotate at the assigned position of the first side body 1A and to be configured in grooving 54 freely and to be embedded in door bolt 40, movable contact 4A, simultaneously harvesting coil spring 53 in recess 54a.Also have, working plate 43 is connected with handle 6 with connecting rod 44.Also have, harvesting electromagnetic drive part 48 and bimetal leaf 46 between separates walls 65 and next door 92, simultaneously together, in company with frame section 83 cutter is held spring portion 81 be set in place the cutter that holds spring portion 81 in above-mentioned cutter than the first side body 1A hold spring portion storage portion 90 more the cutter of top hold spring storage portion 93.At this moment, to be locked together in the locking holes 94 that the first side body 1A as shown in figure 19 forms by the whole sealed pawl 83b that extends the supporting slice 83a lower end that is provided with in guide plate 83 frame section bottoms, scaffold portion 83 is simultaneously in the bottom of the inboard section that protrudes of the first housing 1A antetheca by semicircular projection 97 scaffold portions 83.

The lower end of the separates walls 65 of top is parallel in the bottom to the other end direction of the first housing 1A slightly than the bottom of the first side body 1A from being positioned at, the inclination position that is tilted to of the central portion of configuration movable contact 4B between the bottom of the next door 95 that prolongs and the first side body 1A that is inclined upwardly by this parallel portion, by the barbed portion 14a in next door 14, the free end side of movable contact 4B is provided in the space that has disposed fixed contact 12B.At this moment, the flange 96 that protrudes setting respectively with the bottom of the following and first side body 1A of the parallel portion of next door 95 is clamped the fixedly rearward end of movable contact 4B.Also have, at this moment the U font flexing portion of rearward end and interior sheet 80 be embedded in the semicircular flange 103 that the medial surface than the first side body 1A protrudes ', make its location.

Separate buckle 41 with first and be configured in assigned position freely with torsionspring 60 rotations.And separate buckle 41 with second and rotate and be configured in assigned position freely.

So as shown in figure 19, first side body 1A side configuration middle casing 7 and be stored in terminal block 10B in the recess 9 of this middle casing 7, releasing handle 17 ' with and back-moving spring 21 ', after having assembled, stress compositely to put terminal block 10B at the first side body 1A, remove handle 17 ' and with back-moving spring 21 ' the be assemblied in middle casing 7 in the recess 9.

Here, when the assigned position at the first side body 1A sets middle casing 7, peristome 39 by longitudinal wall 32 sets movable contact 4A in recess 34 simultaneously, on the section face 31a of diapire 31, be positioned in the front end sidepiece of the fixed contact 12A that is provided with on the terminal block 10A, embed axle 36 at the recess 37 of removing handle 17 simultaneously.

The fixed contact 12B that is provided with on terminal block 10B therein in mounting on the flange on the bottom of the first side body 1A 26.And the end that on the tabular surface that the end wall of the first side body 1A forms, is positioned in middle casing 7 form below hypomere portion.

Under this form, second side body 1B stack is combined in the first side body 1A side.At this moment, by everywhere the elasticity locking piece 100 of the first side body 1A about the whole two ends of protruding of the second side body 1B side ... front end claw type articulate locking part 101 be locked together in convex shaped that the corresponding second side body 1B side is provided with by mounting part 102, constituted in conjunction with the device main body 1 (with reference to Fig. 4, Fig. 5, Fig. 7 etc.) of fixing the first side body 1A and the second side body 1B.In the combination of unloading this first side body 1A and 1B fixedly the time, corresponding each that is provided with in the second side body 1B side is by mounting part 102 ... remove hole 150 insertion screwdrivers 151 from each and push corresponding each elasticity locking piece 100 upward ... articulate locking part 101, by breaking away from and, can unloading the second side body 1B from the first side body 1A by the form that articulates of mounting part 102.

Axle 41a that the axle 40a, first of door bolt 40 separates buckle 41 rotates to insert freely and adheres to the second side body 1B, the axis hole 52,56 that is provided with at the second side body 1B medial surface.

Also have, the adjustment screw 77,77 of corresponding each bimetal leaf 45,46 ' head approach the peristome 104 of the top opening of device main body 1 respectively, at the peristome 105 of bottom opening, the such peristome of the best operating point that obtains when testing 104,105 by the action after assembling screw in action adjust screws 77,77 ', adjust the initial position of bimetal leaf 45,46 like that to Figure 11 (b) by Figure 17 (a), after it is adjusted, utilize its elasticity, use position separately to cover peristome 104,105 loam cake 106, lower cover 106 ' embedding device main body 1.

Here, bimetal leaf the 45, the 46th, with the width of device main body 1 to be a Width part overlapping be set up in parallel like that device main body 1 vertically, with the densification of the Width size of seeking device main body 1.Also have since with the displacement direction setting in mutual lateral direction, so know the initial position of invariant position in advance, even each bimetal leaf 45,46 displacement owing to can not carry out the installation exercise of each bimetal leaf 45,46 easily near more than the initial position.That is to say that if in same direction displacement, need set and adjust its addendum modification, the installation exercise of each bimetal leaf 45,46 is troubles, does not have such trouble in the present embodiment.

Also having, is the separates walls 65 in next door owing to exist between each bimetal leaf 45,46, can reduce the interval between two bimetal leafs 45,46, can make full use of the space that sets of the switching mechanism 5 that is stored in the device main body 1 and contact portion.Classification track 79,82 above-below directions by device main body 1 that particularly will connect each bimetal leaf 45,46 turn back, so carry out the operation of turning back of classification track 79,82 easily.

Then, in the harvesting of the inside of an end inside of device main body 1 cutter of clamping contact rod along the vertical direction is set and holds spring portion 78,81.To hold the corresponding mode of spring portion 78,81 with these cuttves, in an end of device main body 1, the end face of device main body 1 and two sides form the contact rod insertion groove 107,108 of " コ " font opening.

Also have, form a pair of electric wire insertion holes 16A, the 16B that is tilted to upper shed side by side in the other end of device main body 1.

Particularly, at this electric wire insertion holes 16A, the end face of the below of 16B forms will use two housings 1A, the fixed contact 2B of the area configurations of the inner underside in two zones that the sidewall of 1B and middle casing 7 separate and the switch motion of moving contact 3A and the gas that produces, the opening of discharging with locking holes 112 is installed by steam vent 109 and device main body, particularly formation on the other end of device main body 1, as shown in figure 18, will be in the switch motion of the fixed contact 2A of the area configurations of upside and moving contact 3A and the steam vent 110 that the gas that produces is discharged obliquely upward.

These two steam vents 109,110 separate up and down, and owing to face the angle that the direction of device main body 1 outside is left mutually, the discharge direction of the electric arc that is produced when forcing to disconnect is different, and the electric arc by the two poles of the earth mixes can prevent intereelectrode short-circuit.Here, steam vent 110 as shown in figure 18 be the flange 113 that raises of the front end of inner middle casing 7, remove handle 17,17 ' the flange 114,114 that protrudes of side and the horizontal protrusion wall 115 of the opening of the steam vent by facing housing 1A, 1B, emission gases is directed to oblique upper, so be not easy the gas cross of discharging with the steam vent 109 of below.

Then,, connect each terminal block 10A, 10B, contact rod and each cutter are held spring portion 78 be connected, then the circuit-breaker of present embodiment can be inserted circuit if insert the electric wire 111,111 of load-side respectively to electric wire insertion holes 16A, 16B.Among the figure 112 is the fixing locking holes of usefulness of device main body.

The operation of present embodiment is described according to Figure 20 to Figure 25 below.

Figure 20 represents to disconnect form, disconnects under the form at this, and the operating portion 6a of handle 6 is the form of being stood upside down and being exposed by peristome 50, and the form that an end of working plate 43 and first is separated buckle 41 combinations is in the form that comes off.Then, it is last that door bolt 40 leans on it by helical spring 62 as clockwise direction rotation among the figure, movable contact 4A in the grooving 54 of perforation insertion door bolt part 40 is positioned at and is moved upward free-ended form, and, connect to insert the elastic force of movable contact 4B by its spring in the grooving 55 and be positioned at and be moved upward free-ended form, be positioned at moving contact 3A, the 3B of separately free end setting and leave corresponding fixed contact 2A, the form of 2B.

Under this form, when the operating portion 6a of clockwise direction turning handle 6, the last side shaft 44a of connecting rod 44 presses downwards, and connecting rod 44 is pressed working plate 43 by side shaft 44b down.By pressing working plate 43, one end of working plate 43 (right-hand member of figure) touches first locking part 57 of separating buckle 41, with its position as center of rotation, working plate 43 rotates to counter-clockwise direction, the other end of working plate 43 (left end) touches the protuberance 84 that is provided with in the upper end of door bolt 40 as shown in figure 21 like that, leans on the reaction force of spring that door bolt 40 counter-clockwise direction are rotated.

Rotate by this, the movable contact 4B that connects in the grooving 55 that inserts door bolt 40 bends towards the direction that its free end moves down, and makes free-ended moving contact 3B contact fixed contact 2B.And, connect the movable contact 4A counter-clockwise direction of inserting in the grooving 54 and rotate, make its free-ended moving contact 3A contact fixed contact 3B.This contact gear ratio moving contact 3B contact fixed contact 2B postpones.

Here,, do not need to connect the spring assembly of pressing usefulness because movable contact 4B connects pressure with its elasticity from body, and, do not connect owing to do not need to carry out circuit with classification track, be connected operation so saved the part assembling work with classification track, production efficiency is improved.

Then, when handle 6 clockwise directions are rotated, the last side shaft 44a of the line of the position of the following side shaft 44b of connection connecting rod 44 and the center of rotation of handle 6, move to left-hand as shown in figure 22, under this form, the torsionspring 51 of handle 6, by 40 helical spring 62, the spring force of further balanced movable contact 4B etc. of fastening with a bolt, the breech lock form that keeps the end and first of working plate 43 to separate the locking part 57 of buckle 41 is kept the arrangement for closed configuration of Figure 22.Figure 23 is illustrated in and takes off the above-mentioned arrangement for closed configuration of separating under buckle 41,42 forms.

Under arrangement for closed configuration, when the operating portion 6a counter-clockwise direction that makes handle 6 is rotated, because the last side shaft 44a position of connecting rod 44 is to the line of center of rotation that will connect handle 6 and following side shaft 44b, cross right, be moved upward the breech lock form that the left end and first of releasing working plate 43 is separated the locking part 57 of buckle 41, door bolt 40 rotating along clockwise by helical spring 62 against power, simultaneously, handle 6 leaves a side by reverting to against the power quick rotation of helical spring 51.Because the clockwise direction to door bolt 40 rotates, movable contact 4A rotates along clockwise direction, and free end is moved upward, and makes moving contact 3A leave fixed contact 2A.And movable contact 4B does not push downwards, with its spring force attitude that resiles, makes its free-ended moving contact 3B leave fixed contact 2B.This leaves than moving contact 3A and leaves fixed contact 2A delay.It is identical when this delay disconnects with the pressure that the back will be told about.

Here, owing to have the switching and the delay of the contact portion at the two poles of the earth as described above, the electric arc that the contact is produced when opening and closing only is the movable contact 4A of rigid body side, and the moving contact 3B that can prevent to be made of spring material is owing to electric arc consumes.

Because the electric arc that produces in the contact at the two poles of the earth portion produces in configuring area separately, and the discharge directions difference of steam vent 109,110 can prevent intereelectrode short-circuit.

Because the groove 131 that the Width of the front end face of the door bolt 40 that rotates during the leaving of contact portion forms is fastened the spacer 130 that forms at two housings 1A, 1B and middle casing 7; With the bottom connection of groove 131, needn't worry that the electric arc that produces enters another zone by door bolt 40 1 sides of the inboard of device main body 1 are circuitous, prevents to cause intereelectrode short-circuit by the electric arc in the device main body 1 in a zone.

Also have, since with near the space the fixed contact 2A of the fixed contact 12A of upside as by the bulge 30 of middle casing 7 to the wide space the sidewall of two housings 1A, 1B, and, with near the space the fixed contact 2B of the fixed contact 12B of downside as to the wide space between the sidewall of two housings 1A, 1B, therefore can reduce because each contact portion produces the air pressure of electric arc when leaving, can prevent to cause slight crack and the breakage of two housings 1A, 1B by air pressure.

Also have,, can prevent that the carbonoxide that produces when leaving in contact portion from causing ageing of insulation because middle casing 7 is to be shaped with the resin material that contains magnesium hydroxide.

In above-mentioned arrangement for closed configuration as shown in figure 22, when having served as live stream and flowing through load, bimetal leaf 45,46 is owing to the overload current flexural deformation of generating heat.Here, by sagging bimetal leaf 45 lower ends, top to the left of figure to mobile displacement, and displacement is moved to the right of figure in bimetal leaf 46 upper ends that stand, as shown in figure 23, first drive division 69 of buckle 41 is separated in the lower end of bimetal leaf 45 direction promotion left first, and second drive division 70 of buckle 42 is separated in the upper end of bimetal leaf 46 to right promotion second.That is to say that the free end of two bimetal leafs 45,46 is to the direction displacement of leaving mutually.Because this displacement, first and second is separated buckle 41,42 clockwise directions and rotates, and at this moment, second 42a of subtend portion that separates buckle 42 promotes the first support part 59 of separating buckle 41, separates buckle 41 to first clockwise rotatory force is provided.

Here, because the energising direction of bimetal leaf 45,46 rightabout each other when big electric current flows through, produces the magnetic force of departure direction each other on two bimetal leafs 45,46.Therefore, can make bimetal leaf 45,46 quick bending deflections, its result can disconnect in faster pressure.This action disconnects effective too to the pressure of telling about later owing to short circuit current.

Have, when first separates the rotation of buckle 41 clockwise directions, remove the breech lock form of an end (right-hand member) of locking part 57 and working plate 43, working plate 43 is the center with the following side shaft 44b of connecting rod 44, and clockwise direction rotates.Therefore, the other end of working plate 43 (left end) is limit catch 40 not, and door bolt 40 relies on helical spring spring force clockwise direction to rotate, as shown in figure 24, movable contact 4A, 4B are returned to leave form, make moving contact 3A, 3B leave fixed contact 2A, 2B respectively.

Thereafter, because circuit disconnects, bimetal leaf 45,46 turns back to former form, first separate buckle 41 by torsionspring 60 against power, go back to original position, simultaneously, support 59 promotes second 42a of subtend portion that separates buckle 42, makes second to separate buckle 42 and turn back to original position.Also have, handle 6 by torsionspring 51 against power, rotate back into and close direction of operating (counter-clockwise direction).

Also have, under above-mentioned arrangement for closed configuration, when the super-high-current of short circuit current flow,, attract the movable core 58,67 of correspondence, it is shaken fixed iron core 74,74 ' the generations magnetic force of electromagnetic drive part 47,48.Therefore, as shown in figure 25, the drive division 58a of movable core 58 promotes first support 89 of separating buckle 41, and the drive division 67a of movable core 67 promotes second support 68 of separating buckle 42, make its respectively clockwise direction rotate.When flowing through overload current, same first separates buckle 41 clockwise directions rotates, and removes the breech lock form of an end (right-hand member) of locking part 57 and working plate 43, and working plate 43 is that the center clockwise direction rotates with the following side shaft 44b of connecting rod 44.Therefore, by the other end (left end) of working plate 43 limit catch 40 not, door bolt 40 relies on the spring force clockwise direction of helical springs 62 to rotate, and movable contact 4A, 4B is returned to leave form, makes moving contact 3A, 3B leave fixed contact 2A, 2B respectively.

After this, when circuit disconnects, to the fixed iron core 74,74 of electromagnetic drive part 47,48 ' when not producing magnetic force, movable core 58,67, the spring force by flat spring turns back to former form.First separates the power of buckle 41 by torsionspring 60, goes back to original position.Simultaneously, promotion second is separated buckle 44 and is turned back to original position.Also have, handle 6 by torsionspring 51 against power, rotate back into and close direction of operating (counter-clockwise direction).

Here, because at movable core 58, each fixed iron core 74 of 67,74 ' on set that to be attracted direction be reciprocal each other electromagnetic drive part 47,48, even apply vibration, movable core 58, in 67 one because the direction action that vibration is attracted, the direction action that another back suction is drawn, therefore, make first, second separates buckle 41,42 to breech lock trip direction rotatory force only action by any one movable core obtain, therefore, resist torsionspring 60 against power, can not obtain freeing first power of separating buckle 41, thereby can prevent because the misoperation that the knot vibration is taken place.

Of the present invention first the invention, include fastening fixed contact two fixed contacts, fastening and Described each fixed contact break-make freely the moving contact of subtend two movable contacts, the operation freely Ground keeps the switching mechanism of these two movable contacts, include by this switching mechanism make described each can The handle of movable contact and each fixed contact break-make and can keep this handle and form row from peripheral operation Go out two rows of the arcing gas that described each moving contact produces when described each fixed contact is left The device main body of pore. In the sort circuit breaker, about on the short transverse of device main body Two sections form described steam vent, therefore, and when described each moving contact leaves from described each fixed contact When the electric arc that produces occurred outside the device main body, the electric arc of each utmost point was difficult to mix, and has and can prevent End the effect of intereelectrode short-circuit.

Second invention of the present invention comprises first invention, the external-open oral area of described each steam vent That the angle that is separated from each other forms, therefore, when electric arc comes out from steam vent, the easy edge of electric arc Mutually different directions is discharged, add the effect of first invention, has more to prevent intereelectrode short-circuit Effect.

The 3rd invention of the present invention comprises first or second invention, in described device main body Be set up in parallel described each moving contact and each fixed contact on the width, simultaneously described device master The short transverse of body in up and down configuration, arranges the next door member of described each fixed contact of isolation, will Described each moving contact and fixed contact separately are stored in by two on the described device main body width Two zones that sidewall and next door member separate, upper in described device main body in a zone The steam vent of square one-tenth epimere moving contact and fixed contact, simultaneously in another internal area in institute The below of stating device main body forms the steam vent of hypomere moving contact and fixed contact. Therefore, each utmost point Steam vent by the next door member it is isolated, can prevent described each moving contact from each described each The electric arc that fixed contact produces when forcing to disconnect mixes in device main body, has the interpolar of preventing weak point The effect on road.

The 4th invention of the present invention comprises the 3rd invention, and described next door member is included in each admittedly Decide between the contact described device main body sidewall slightly to be extended in parallel, and with the described device of epimere contact side The part main body wall is opened with the longitudinal wall part of epimere fixed contact harvesting with from this longitudinal wall part lower end together Begin, extend slightly abreast with the bottom surface of device main body and with the described device master of hypomere fixed contact side The cross wall section that the sidewall of body is received and kept the conductor coupling portion of hypomere contact side together, and solid from epimere Beginning is to the sidewall side of the described device main body of hypomere fixed contact side near the fixed contact of fixed contact To bulging and with the bulge of the described device main body sidewall contact of hypomere fixed contact side; By the institute State the two side of cross wall section and bulge and described device main body, harvesting makes across described device The fixed contact of the hypomere fixed contact between the two side of main body. Therefore, can be wide by bulge Reach between the device main body two side near the general fixed contact that obtains the epimere fixed contact, also can simultaneously Reach between the device main body two side near extensively obtaining the fixed contact of hypomere fixed contact, can reduce Be formulated in the arcing gas that each regional moving contact produces when fixed contact is left, have appearance Easily prevent from causing slight crack or damaged effect because air pressure makes device main body.

The 5th invention of the present invention comprises the 4th invention, and described switching mechanism comprises can with each Moving contact by both sides respectively horizontal intercalation enter and have free to rotate with the grooving of each regional connectivity Door bolt; On the two side of described next door member and described device main body, but be arranged on described each movable contact Put the location of the front end face of the moving contact side of touching described door bolt under the form of leaving each fixed contact Sheet. Therefore, have and reduce that institute produced when described each movable contact left from described each fixed contact Electric arc by the worry that door bolt one side of device main body inboard enters other zones, it is short to have an interpolar of preventing The effect on road.

The 6th invention of the present invention comprises the 5th invention, the front end face of described spacer and door bolt On concavo-convex locking part is set. Therefore, owing to form locking part at the end face of spacer and door bolt part, Just need not be afraid of that the electric arc that produces in upside or the underside area directly enters upside or underside area, adds The effect of the 5th invention has more the effect of the intereelectrode short-circuit that prevents that electric arc from causing.

The 7th invention of the present invention comprises the 3rd to the 6th invention, and described next door member is Material by alkaline including earth metal hydroxide is made, and therefore, can be prevented described each moving contact The effect of the insulation ag(e)ing that oxidation of coal produces when leaving from described each fixed contact.

Claims (7)

1. circuit-breaker, include two fixed contacts of fastening fixed contact, fastening and described each fixed contact break-make is two movable contacts of the moving contact of subtend freely, operation freely keeps the switching mechanism of these two movable contacts, include the handle that makes described each moving contact and each fixed contact break-make by this switching mechanism, with can keep this handle and form to discharge the device main body of two steam vents of the arcing gas that described each moving contact produced when described each fixed contact is left from peripheral operation, it is characterized in that, form described steam vent at two sections in the short transverse of described device main body.

2. circuit-breaker according to claim 1 is characterized in that, the outer peristome of described each steam vent is to form with the angle that is separated from each other.

3. circuit-breaker according to claim 1 and 2, it is characterized in that, on the Width of described device main body, be set up in parallel described each moving contact and each fixed contact, while is in the short transverse of described device main body, in configuration up and down, the next door member of isolating described each fixed contact is set, described each moving contact and fixed contact separately are stored in two zones that separated by two side on the described device main body Width and next door member, in a zone, above described device main body, form the steam vent of epimere moving contact and fixed contact, in another zone, below described device main body, form the steam vent of hypomere moving contact and fixed contact simultaneously.

4. circuit-breaker according to claim 3, it is characterized in that, described next door member is included between each fixed contact described device main body sidewall is slightly extended in parallel, and with the described device main body sidewall of epimere fixed contact side together with the longitudinal wall part of epimere fixed contact harvesting, with lower end from this longitudinal wall part, slightly extend in parallel with the bottom surface of device main body, and with the sidewall of the described device main body of hypomere fixed contact side together with the cross wall portion of the conductor coupling portion harvesting of hypomere fixed contact, and near the beginning fixed contact of the fixed contact of epimere to the sidewall direction bulging of the described device main body of hypomere fixed contact side and the bulge that contacts with the sidewall of the described device main body of hypomere fixed contact side; By the two side of described cross wall portion and bulge and described device main body, harvesting is across the fixed contact of the downside fixed contact between the two side of described device main body.

5. circuit-breaker according to claim 4 is characterized in that, described switching mechanism includes is gone into described each movable contact and have a door bolt free to rotate with the grooving of each regional connectivity by the horizontal respectively intercalation in both sides; On the two side of described next door member and described device main body, be provided with the spacer of the front end face of the moving contact side of under described each moving contact leaves the form of each fixed contact, touching described door bolt.

6. circuit-breaker according to claim 5 is characterized in that, on the front end face of described spacer and door bolt, is provided with concavo-convex locking part.

7. according to each described circuit-breaker of claim 3 to 6, it is characterized in that described next door member is to be made by the material of the hydroxide of alkaline including earth metal.

Images