CN1384518A - Circuit breaker - Google Patents

Abstract

A breaker. The first junction part of voltage electrode side is composed of a fixed junction 2A and a movable junction 3A fixed to a movable contactor 4A tip, and the second joint part of the ground electrode side is composed of a fixed junction 2B and a movable junction 3B fixed to a movable contactor 4B tip. The distance to move the movable junction 3B when the second joint part is switched to an opened electrode state or a closed electrode state is made shorter than the distance to move the movable junction 3A when the first joint part is switched to the opened electrode state or the closed electrode state. Therefore, at the time of closing, the second joint part carries out the closed electrode earlier than the first joint part does, and at the time of releasing, the second joint part carries out the opened electrode later than the first joint part does. As a result, it can be prevented that a large current flows into the second joint part of the ground electrode side or that an arc is generated at the time of opening and closing, and the inexpensive junction material whose durability is not high can be used.

Description

Circuit breaker

Technical field

The present invention relates to a kind of circuit breaker.

Background technology

Open the spy and to disclose a kind of existing circuit breaker in the flat 11-329201 communique.The structure of the existing circuit breaker of putting down in writing in described communique is: a part is stretched out from casing, the handle that is supported and can freely rotate by the casing axle links by connecting rod and check plate, the interlock plate that is used to drive two movable contacts of the contact portion switching that can make voltage pole one side and neutral pole one side is pushed driving by check plate, if under check plate is stopped at state on the stop matching board, come the rotating operation handle, then each movable contact is driven by interlock plate, and the contact portions of voltage pole and earth electrode is not is not opened and closed.

In described existing example, because adopted the interlock plate of utilization and handle interlock to come the structure of each movable contact of the while driving voltage utmost point one side and earth electrode one side, so exist the problem of the following stated: promptly, because the contact portion of voltage pole one side is more closed earlier than the contact portion of earth electrode one side, or the contact portion of earth electrode one side is than the contact portion disconnection earlier of voltage pole one side, when opening and closing, just might produce electric arc or cause big electric current to flow through the contact portion of earth electrode one side, also must be the same thereby cause with the contact portion of voltage pole one side in the contact portion of earth electrode one side, the high price contactor material that useful life longevity is good.

Summary of the invention

The existence of problem in view of the above the objective of the invention is to:

Provide a kind of can be at the circuit breaker of the not high cheap contactor material of the contact portion useful life longevity of earth electrode one side.

In order to reach described purpose, the present invention 1 circuit breaker comprises:

The body that holds main circuit;

By body pivotal support and handle that can freely rotate;

First travelling contact that has first fixed contact and contact, separate, and the first contact portion that inserts the voltage pole of main circuit with first fixed contact;

Second travelling contact that has second fixed contact and contact, separate, and the second contact portion that inserts the earth electrode of main circuit with second fixed contact;

The interlock along with the rotation of handle moves first travelling contact on the direction that contacts, separates with first fixed contact, and is difficult to first movable contact that deflection ground forms at least on the moving direction of first travelling contact;

By the drive member of first movable contact driving;

With the drive member interlock, second travelling contact is moved on the direction that contacts, separates with second fixed contact, on the moving direction of second travelling contact, have flexual second movable contact at least;

And when switching the second contact portion between off-state and closure state, the distance that makes distance that second travelling contact moves and first travelling contact is moved when switching the first contact portion between off-state and closure state is short;

If turning handle under the state that the first and second contact portions disconnect, with the handle interlock, first movable contact is when contacting first travelling contact to move on the direction of first fixed contact, drive drive member, and with this drive member interlock, second movable contact moves in that second travelling contact is contacted on the direction of second fixed contact, but the second short travelling contact of the displacement before contacting contacts with second fixed contact earlier, thereby the second contact portion closure, if and begin turning handle more from here, then by having the bending of the second flexual movable contact, first travelling contact contacts with first fixed contact, the first contact portion closure.On the other hand, if turning handle under the state that the first and second contact portions disconnect, then with the handle interlock, first movable contact is when the direction that first travelling contact is left from first fixed contact moves, drive drive member, and with this drive member interlock, second movable contact makes second travelling contact move from the direction that second fixed contact leaves, but second crooked under the closure state movable contact returns to original state, make before second travelling contact leaves from second fixed contact, first travelling contact leaves from first fixed contact, thereby the first contact portion disconnects, then, second movable contact that returns to original state makes second travelling contact move to the direction of leaving, thereby the second contact portion is disconnected.In addition, even under the situation of the first contact portion first closure than the second contact portion, at least first movable contact that is difficult to the formation of deflection ground on the moving direction of first travelling contact can not further drive drive member, so limited moving of second movable contact, thereby can stop the second contact portion closure.Therefore, carrying out when off-state switches to the closed action of closure state, the second contact portion of earth electrode one side is necessarily closed earlier than the first contact portion of voltage pole one side, and, in disconnection when action of carrying out switching to from closure state off-state, the second contact portion of earth electrode one side necessarily disconnects after the first contact portion than voltage pole one side.Its result when opening and closing, can prevent that big electric current from flowing through the second contact portion of earth electrode one side and the generation of electric arc, and can the not high cheap contactor material of useful life longevity in the second contact portion of earth electrode one side.

The present invention 2 circuit breaker is characterized in that: in the present invention 1 circuit breaker, first and second movable contacts can be moved freely on same direction, and the moving direction that drive member is configured to make it along first and second movable contacts freely slides, drive member is adopted simple structure, make it easily to be assembled in the body.

The present invention 3 circuit breaker is characterized in that: in the present invention 2 circuit breaker, be set up in parallel the first contact portion and the second contact portion on the short transverse of body, thereby made the body can miniaturization on Width.

The present invention 4 circuit breaker is characterized in that: in the present invention 3 circuit breaker, top ends at first and second movable contacts is fixed first and second travelling contacts respectively, and disposed drive member comparing with the first and second travelling contact tops more by on the position of cardinal extremity one side, with the direction of the moving direction approximate vertical of drive member on, be provided with the longitudinal wall that the cross wall that is present between the first and second contact portions and the moving direction from the end face of drive member one side of this cross wall along drive member stretch out on the body; And utilize cross wall and longitudinal wall and the drive member be provided with on body, can guarantee has sufficient insulation distance between the second contact portion of the first contact portion of voltage pole one side and earth electrode one side.

The present invention 5 circuit breaker is characterized in that: in the present invention 3 circuit breaker, use towards the leaf spring of the attached gesture of direction that second travelling contact is left from second fixed contact and form second movable contact; And, when disconnecting, because utilize second movable contact that constitutes by leaf spring to come drive member is applied actuating force, so the first contact portion that can easily prevent electric arc and caused is deposited.

The present invention 6 circuit breaker is characterized in that: in the present invention 5 circuit breaker, the position of the substantial middle of the Width of body is provided with the first contact portion, and an end of body Width is provided with the second contact portion, and another end of the Width of body is provided with and makes the disconnection spring of drive member towards the attached gesture of direction that the first and second contact portion is disconnected simultaneously; When disconnecting, by disconnecting spring to drive member effect actuating force, therefore, the first contact portion that can more easily prevent electric arc and caused deposited, and the load stabilisation that the first and second contact portions are born.

The present invention 7 circuit breaker is characterized in that: in the present invention 6 circuit breaker, short transverse along body is provided with drive member and it can freely be slided, and, the disconnection spring that is made of compression helical spring is installed between drive member and body, location and the fixing fixed part that disconnects the end of spring are set respectively on drive member and body simultaneously, therefore the buckling of the disconnection spring that constitutes by compression helical spring can be prevented, thereby drive member can be driven reliably.

Description of drawings

Following brief description accompanying drawing.

Fig. 1 represents the off-state of embodiment, is the end view under the state after having pulled down first side box body.

Fig. 2 is the same exploded perspective view.

Fig. 3 is the exploded perspective view of the same overcurrent disconnecting apparatus.

Fig. 4 is the stereogram of the same overcurrent disconnecting apparatus.

Fig. 5 is the same front section view.

Fig. 6 is the same central cross sectional view.

Fig. 7 represents the same closed or disconnect state in the action, is the end view under the state of having pulled down behind first side box body.

Fig. 8 represents the same closure state, is the end view under the state of having pulled down behind first side box body.

Fig. 9 represents the moment of the same bimetallic displacement, is the end view under the state of having pulled down behind first side box body.

After Figure 10 represented the same bimetallic displacement, the state that contact portion is forced to disconnect was an end view of having pulled down the state behind first side box body.

Figure 11 represents the moment of the electromagnetic drive part action of the same example, is the end view under the state of having pulled down behind first side box body.

Following brief description reference numeral.

The 1-body; 2A, 2B-fixed contact; 3A, 3B-travelling contact; 4A, 4B-movable contact; The 5-switching mechanism; The 6-handle; The 40-drive member; The 43-coupling member; 44-connects pressing spring; The 45-guide plate; 47-overcurrent disconnecting apparatus; The 58-stopper element.

Embodiment

Below, be illustrated with regard to one embodiment of the invention with reference to Fig. 1～Figure 11.

The circuit breaker of present embodiment comprises: in the body 1 that constitutes at the plastic first side box body 1A that connects both sides and the second side box body 1B, arrange two fixed contact 2A, 2B that are provided with on the Width of body 1; Two movable contact 4A, the 4B of relative travelling contact 3A, the 3B that also can freely contact with it, separate with each fixed contact 2A, 2B have been fixed; Drive the switching mechanism 5 of these two movable contact 4A, 4B; And, closure according to handle 6, opening operation, by switching mechanism 5, each travelling contact 3A, 3B and each fixed contact 2A, 2B connects from (contact, separate), on the short transverse of body 1, each fixed contact 2A of upper and lower settings, 2B and each movable contact 4A, 4B, and two movable contact 4A, among the 4B, at each travelling contact 3A, 3B is from each fixed contact 2A, under the state that 2B separates, observe from the Width of body 1, on short transverse, be present in two fixed contact 2A, movable contact 4B between the 2B contacts with the travelling contact 3A with another movable contact 4A, the fixed contact 2A that separates is arranged on the Uncrossed height and position.And, the first contact portion that is made of fixed contact 2A and travelling contact 3A is inserted in the voltage pole of main circuit, the second contact portion of fixed contact 2B and travelling contact 3B formation is inserted in the earth electrode (neutral pole) of main circuit.

In an end of body 1, be clipped between two side box body 1A, the 1B, fixed middle housing 7 by the synthetic resin material forming, held in the interval that the recess 8 of the sidewall of the second casing 1B (outer wall) and the longitudinal wall part of middle housing 7 35 constitutes and constituted the terminal block 10B that fixed contact 2B is provided with earth electrode one lateral circuit at one end, constituted at the sidewall (outer wall) of the recess 9 that the first side box body 1A of middle housing 7 side is provided with and the first side box body 1A and held the terminal block 10A that constitutes fixed contact 2A setting voltage pole one lateral circuit at one end in the interval.

Terminal block 10A partly is made of the following stated: the terminal board 11 that is converted into the コ shape; Prolong sheet 11a from an end of following of this terminal board 11 body extension upward, be bent into the right angle from the upper end that prolongs sheet 11a for prolonging sheet 11a, for the fixed contact 12A of terminal board 11 outside one extensions; The fixed contact 2A of riveted and fixed on the upper surface of the end of this fixed contact 12A; Be installed on following of terminal board 11, and be collected in the locking spring 13A of the nearly system word shape in the terminal board 11.This terminal block 10A constitutes the bottom of the recess 9 of middle housing 7, in the parallel cross wall portion 24 that extends to form in the bottom of body 1, put terminal board 11 following, be configured to make its longitudinal wall 25 prolonging sheet 11a along an end of recess 9, the upper end that fixed contact is exceeded longitudinal wall 25 exports to outside the recess 9, the outside at the recess 9 of the length direction of the second side box body 1B, by be close to the end of configuration fixed contact 12A on the integrally formed abreast cross wall 15 in bottom, make it within recess 9 with the second side box body 1B.On cross wall 15, form the recess 15a of the lower end of the fixed contact 2A that avoids fixed contact 12A.Terminal board 11 extends to form T word slice 11b from last slice the other end one that makes progress, and the top of the side protuberance of the upper end of this T word slice 11b is placed on the upper surface of protruding flat 22 ＇ of portion that form on the wall of middle housing 7.In addition, on the side of the lateral plate of terminal board 11, integrally formed being inserted in the compressing tablet 13b that locks spring 13A prevents to lock the projection 23 that spring 13A rocks.

Locking spring 13A and terminal board 11 constitute the speed knot terminal as conductor coupling portion, when middle casing 7 overlaps with the first side box body 1A, by by in the cross section that is provided with on the longitudinal wall part of the other end of the recess 9 of middle housing 7 be under semicircle shape oblique ditch 160 and with this ditch 160 under oblique equally be provided with on the longitudinal wall of the other end of the first side box body 1A oblique under the electric wire insertion holes 16A that forms of ditch 160, the heart yearn of the electric wire (not shown) of inserting from the outside be pressed into terminal board 11 last slice and the upper end of the upper end of the locking plate 13a of locking spring 13A and compressing tablet 13b between, top from locking plate 13a, lead locking heart yearn for electric wire, and by with the upper surface of compressing tablet 13b heart yearn be pressed in terminal board 11 last slice on, not only be electrically connected heart yearn, and supported it.When removing this electric wire locking, with removing handle 17, remove in the handle 17 at this, gone up 20 supports of axis hole that are provided with at the rotation axis 18 that lower side is provided with by the protruding flat portion 22 ' of the medial surface of middle housing 7, can freely rotate, and support by the recess 37 that forms in the side from the axle 38 that the interior sidewall surface of the first side box body 1A is stretched out, can freely rotate, the operating portion 17a that exposes the outside of body 1 by manual operation, make it to rotate, the driving projection 19 that is provided with in the lower end pressure-locks the front portion of a side of the locking plate 13a of spring 13A, makes locking plate 13a bending, just can remove the lock-out state to heart yearn.Among the figure 21 makes to remove the return spring that handle 17 always relies on the moving direction of operating of backhand.

And terminal block 10B is made of terminal board 11, locking spring 13B, fixed contact 12B equally with terminal block 10A basically, but it is different with the terminal board 11 of terminal block 10A, in the terminal board 11 of terminal block 10B, extend to form prolongation sheet 11c downwards from its end of following, extend to form fixed contact 12B from the top of this prolongation sheet 11c, fixed contact 12B is parallel with the bottom of body 1, and, from an end of terminal board 11, meeting at right angles with it extends to form interior sheet 11d.

Locking spring 13B and locking spring 13A have same structure, and it is placed on following of terminal board 11, insert in the compressing tablet 13b from the projection 23 that the lateral plate of terminal board 11 stretches out.

In this terminal block 10B, following of terminal board 11 is placed on the downward-sloping bottom surface of recess 8 of the second side box body 1B, be configured to make its unlifted wall 8a prolonging sheet 11a along an end of recess 8, in the breach 27 that forms between the end of the bottom surface of the lower end of an end of terminal board 11 embedding recess 8 and recess 8, prolongation sheet 11c is stretched out outside the recess 8, when middle casing 7 overlapped with the second side box body 1B, the end of fixed contact 12B promptly was provided with the underneath of fixed contact 2B on the gusset 26 of the bottom of the second side box body 1B.In addition, near the top of fixed contact 12B, isolated wall 14 uprightly is set from second side box body 1B bottom, and the recess between this isolated wall 14 and the gusset 26 becomes the groove that holds the bottom that the fixed contact 2B of riveted and fixed in the front portion of fixed contact 12B stretch out below fixed contact 12B.

In addition, the top of side extension of upper end that extends upward the T word slice 11b of formation from last slice the other end of terminal board 11 is placed on the upper surface of the protruding flat portion 22 that the wall of the second side box body 1B forms.

Identical with the situation of terminal block 10, the locking spring 13B of terminal block 10B and terminal board 11 constitute the speed knot terminal as conductor coupling portion, when middle casing 7 overlaps with the second side box body 1B, it from the cross section that is provided with by longitudinal wall part the electric wire insertion holes 16B insertion electric wire that ditch 160 under semicircle shape oblique and the ditch 160 under oblique is provided with at the opposite of middle housing 7 wall equally with this oblique ditch 160 down form in the other end of the recess 8 of the second side box body 1B, the locking plate 13a locking of the locked spring 13A of this heart yearn, with compressing tablet 13b heart yearn be pressed in terminal board 11 last slice on, not only be electrically connected heart yearn, and locked it.

When removing this electric wire locking, with removing handle 17 ', remove in the handle 17 ' at this, same with described releasing handle 17,20 supports of axis hole that are provided with on by the protruding flat portion 22 of the second side box body 1B at rotation axis 18 that lower side is provided with, can freely rotate, and the axle (not shown) of stretching out from the wall of the longitudinal wall part 35 of middle casing 7 is by 37 supports of recess that are provided with in the another side, bottom, can freely rotate, the operating portion 17a that exposes the outside of body 1 by manual operation, make it to rotate, the driving projection 19 that is provided with in the lower end pressure-locks the front portion of a side of the locking plate 13a of spring 13B, make locking plate 13a bending, just can remove lock-out state heart yearn.Among the figure 21 makes to remove the return spring that handle 17 ' always relies on the moving direction of operating of backhand.

The switching mechanism 5 that drives movable contact 4A, 4B partly is made of the following stated: handle 6; The coupling member 43 that handle 6 links to each other with the movable contact 4A of voltage pole one side; The stopper element 58 that possesses the retainer 60 of the overshooting shape that has limited movable contact 4A rearward end; Drive member 40.

Coupling member 43 possesses: constituted by turning round helical spring, and two ends roughly are bent into the right angle, connect pressing spring 44 as axle 44a, 44b; Form the guide plate 45 of close-table shape by metallic plate.Guide hole 45a, 45b that two ends of bottom surface that make each 44a, the 44b that connect pressing spring 44 be applied in guide plate 45 are provided with.In addition, the guide hole 45a that a side axle 44a (below be called " go up side shaft ") runs through is a circular hole, and the guide hole 45b that the opposing party's axle 44b (below be called " following side shaft ") runs through is the direction of principal axis and the roughly consistent slotted hole of the bottom surface of guide plate 45 of major axis.

Handle 6 is made of operating portion 6a, rotation section 6b and Handle axis 6c, the Handle axis 6c that stretches out from the central authorities of two sides of rotation section 6b inserts the axis hole 49 that the medial surface of the axis hole 49 that the medial surface of the first side box body 1A forms and the second side box body 1B forms respectively, and can freely rotate, be supported between two side box body 1A, the 1B by axle, operating portion 6a is facing to the fenestra 50 of the upper surface upper shed of the body 1 that constitutes under the state that has connected two side box body 1A, 1B.In addition, installed on the Handle axis 6c, by this handle spring 51, when handle 6 during in closed (on) position (with reference to Fig. 8), for it provides the power that relies on disconnection (off) direction by being turned round the handle spring 51 that helical spring constitutes.

The last side shaft 44a that connects pressing spring 44 of the guide hole 45a that has run through guide plate 45 is inserted in the axis hole (not shown) of the lower end that is arranged on rotation axis 6b and can freely rotate, handle 6 and coupling member 43 link together.

In the dead eye 30 of the both sides setting of the substantial middle of the length direction of the following side shaft 44b insertion movable contact 4A that connects pressing spring 44 of the guide hole 45b that has run through guide plate 45, coupling member 43 is linked to each other with movable contact 4A, thereby coupling member 43 is configured to can move by easy on and off in body 1.

Drive member 40 is formed the tabular of nearly rectangle by the synthetic resin with insulating properties, make length direction consistent with the above-below direction (short transverse) of body 1, between two side box body 1A, 1B, can be free to slide mobile at above-below direction, sidepiece at the first side box body 1A on top, be provided with the sidepiece that makes movable contact 4A dissected valley 40a,, be provided with and make the dissected valley 40b of movable contact 4B from horizontal embedding at the sidepiece of the second side box body 1B of bottom, one side from horizontal embedding.In addition, outstandingly in the end of the first side box body 1A of drive member 40 lower surfaces, one side be provided with nearly columned fixed part 40c, this fixed part 40c goes up the upper end that outer build-in has been decided the disconnection spring 53 that is made of compression helical spring.Between the upright wall 31 and isolated wall 14 that is provided with in second side box body 1B bottom and isolated wall 14 almost parallel ground, as shown in Figure 5, form gusset 111a from the medial surface of the second side box body 1B along wall 31 and isolated wall 14, the bottom that disconnects spring 53 is inserted in the recess (being called " attachment recess ") 111 that is surrounded by wall 31, isolated wall 14 and gusset 111a.Therefore, under the state that has compressed disconnection spring 53, drive member 40 is arranged in the body 1, as shown in Figure 1,, makes drive member 40 rely on the top of body 1 by disconnecting the elastic force of spring 53.At this moment, because disconnecting two ends of spring 53 is separately fixed on fixed part 40c that is arranged on the drive member 40 and the described attachment recess 111 that is arranged on the second side box body 1B, so can prevent to disconnect the lateral bending song of spring 53, thereby can provide restoring force for drive member 40 exactly.

In addition, contact with the recess 40d that below the dissected valley 40a of the side of the first side box body 1A of drive member 40 side, forms from the end 56a of the outstanding nearly hook-type gusset 56 that is provided with of the medial surface of the first side box body 1A, can freely contact, separate, contact from the 40e of outward flange portion that forms between the recess 40d of the 33a of top section portion of the longitudinal wall 33 that extends along above-below direction with the end face of the recess 8 relative sides of the outstanding cross wall 15 that is provided with of the medial surface of the second side box body 1B and drive member 40 and the dissected valley 40b, can freely contact, separate, contact from the outstanding restriction gusset 62 that is provided with in the side of the second side box body 1B and the upper end of drive member 40, can freely contact, separate, thereby limited the moving range of drive member 40.Be provided with the guide recess 34 of the 40e of outward flange portion that guiding stretches out to the Width of body 1 on the medial surface of two side box body 1A, 1B in the moving range of drive member 40.

At this, movable contact 4A is made of the rigid body conductive metal sheet, insert from the side among the dissected valley 40a of drive member 40, separate, contact with fixed contact 2A corresponding to the travelling contact 3A of riveted and fixed on the top, the interlock that moves up and down with coupling member 43, in body 1, move up and down, push the opening edge of dissected valley 40a, drive member 40 is moved at above-below direction.At this, because constitute movable contact 4A, so also hardly can be crooked on the thickness direction of moving direction by rigid body.

In addition, movable contact 4B is made of conductivity spring light sheet, insert from the side among the dissected valley 40b of drive member 40, when drive member 40 moves down, pushed downwards, crooked, remove from the arrested state of this case of bending movable contact 4A, moving up of drive member 40 no longer is limited, and returns, by this bending with return, the travelling contact 3B of riveted and fixed on the top with fixed contact 2B contact, separate.

The bimetallic 46 of bending deflection when as shown in Figure 3 and Figure 4, overcurrent disconnecting apparatus 47 is flow through by electromagnetic drive part 48 that drives check plate 58 when the such super-high-current of short circuit current flows through and the such overcurrent of overload current, driving stopper element 58 constitutes.Electromagnetic drive part 48 partly is made of the following stated: magnetic iron plate is bent into the fixed iron core 57 that is nearly コ shape in vertical view; The double movable core of doing stopper element 58; Support that also movable core 58 (stopper element) is freely shaken on the magnetic pole strength of the two ends of fixed iron core 57, and produce movable core 58 (stopper element) is relied on from the fixed iron core 57 flexible leaf spring 59 of direction separately.

Movable core (stopper element) 58 is made of the metal material also harder than the metal material that forms movable contact 4A (copper alloy) (magnetic iron plate), and the installation sheet 58b that it has the principal part 58a of rectangle, stretch out from the following ora terminalis central authorities of principal part 58a, the limiter 58c that stretches out from the last ora terminalis central authorities of principal part 58a, the side view of stretching out from the central authorities of the face of reverse side one side of the face relative with fixed iron core 57 of principal part 58a are nearly leg-of-mutton retainer 60.Hole 59b by the central portion of the central plate 59a that is inserted in the rivet pin (not shown) insertion leaf spring 59 among the installing hole 58d that has run through installation sheet 58b is formed can freedom joltily support leaf spring 59.

On the other hand, in leaf spring 59, in the hole 46a that the bottom of the 67 insertion bimetallics 46 of the rivet pin among the hole 59e that is inserted in the bottom of having run through central plate 59a is formed, make the bottom vertical stand-up of bimetallic 46 from central plate 59a.Be configured to along the outer surface of two lateral plate 57a, 57a of fixed iron core 57 by two lateral plate 59c, the 59c that the upper end of the central plate 59a of leaf spring 59 is bent to form towards two sides, the locking plate 59d, the 59d that inwardly stretch out on the front end of two lateral plate 59c, 59c are pinned recess 57b, the 57b of bight, the outside formation of fixed iron core 57, as shown in Figure 4, make from the bimetallic of the bottom vertical stand-up of the central plate 59a of leaf spring 59 to be present between fixed iron core 57 and the movable core (stopper element) 58, fixed iron core 57 fixed supports leaf spring 59.At this moment, the magnetic pole strength of the front end of two lateral plate 57a, 57a of fixed iron core 57 is present between the central plate 59a and two lateral plate 59c, 59c of leaf spring 59, and is relative with movable core (stopper element) 58.

In the bimetallic 46, the other end that an end is deposited over the classification track 79 on the movable contact 4A is deposited over than central authorities slightly by on the plate face of below, and the conductive plate 70 that constitutes the circuit of voltage pole one side engages with the plate face of upper end.The conductive plate 70 that is made of metallic plate has the main leaf 70a of anti-L font, the Extendible flake 70b of the L font that stretches out from the upside of main leaf 70a, the joint fastener 70c parallel that extends out from the top of Extendible flake 70b with main leaf 70a, the stator 70d of the L font that stretches out from the lower side of main leaf 70a, the top ends of joint fastener 70c engages with bimetallic 46, and the cutter that clips the contact rod (not shown) that is provided in the voltage pole in the distribution panelboard holds spring 78 and is deposited on the lower end of stator 70d, and cutter holds spring 78, conductive plate 70, bimetallic 46, classification track, movable contact 4A is electrically connected.The super-high-current such when short circuit current passes through terminal block 10A and conductive plate 70, when flowing through the bimetallic 46 that inserts the voltage pole circuit, fixed iron core 57 is by excitation, the magnetic force that produces on two lateral plate 57a by fixed iron core 57, the magnetic pole strength on 57a top, movable core (stopper element) 58 is shaken in attraction, and the retainer 60 of the rearward end of pinning movable contact 4A is moved.Like this, by retainer 60 is set on movable core 58, dual-purpose is done stopper element, can reduce number of components, thereby can simplify the workload when overcurrent disconnecting apparatus 47 is installed to body 1.

On the other hand, the conductive plate 71 that constitutes the circuit of earth electrode one side is deposited on the rearward end of movable contact 4B of earth electrode one side.As shown in Figure 2, the conductive plate 71 that constitutes by metallic plate have an end be deposited over main leaf 71a on the movable contact 4B, from the other end of main leaf 71a erect the sheet 71b that stands up that comes, the Extendible flake 71c of the L font that extends out from the top of the sheet 71b that stands up, to hold spring 78 same with above-mentioned cutter, the cutter that clips the contact rod (not shown) that is provided in the earth electrode in the distribution panelboard holds spring 81 and is deposited on the top of Extendible flake 71c of stator, and cutter holds spring 78, conductive plate 71, movable contact 4B and is electrically connected.

So, when the circuit breaker of assembling present embodiment, at first terminal block 10B is collected in the recess 8 of the second side box body 1B, and contact handle 17 ' is contained in certain position with recovering spring 21 '.In addition, handle 6 is contained in institute's allocation with handle spring 51, at one end the upper slitter that is provided with of the top of portion holds and holds cutter in the collection portion of spring portion 93 and hold spring portion 81, and the sheet 71b that stands up of configuration conductive plate 71 makes it along the gap between the next door 91,92 of the second side box body 1B.In addition, the inclination position obliquely of the central portion of movable contact 4B be configured in from be positioned at than the bottom of the second side box body 1B slightly the lower end in the next door 92 of top towards the other end direction of the second side box body 1B, parallel with the bottom, between be inclined upwardly the bottom of the next door 95 of extending and the second side box body 1B from this parallel portion again, free end one side of movable contact 4B is being striden wall 31 and isolated wall 14, is configured in the space that has disposed fixed contact 12B.At this moment, a plurality of gussets 96 that are provided with respectively on the bottom with the lower surface of the parallel portion in next door 95 and the second side box body 1B clip the rearward end of the main leaf 71a and the movable contact 4B of conductive plate 71.

Then, in the dissected valley 40b of drive member 40, sandwich movable contact 4B, and two ends that disconnect spring 53 are fixed on the attachment recess 111 of setting on the fixed part 40c of lower surface of drive member 40 and the second side box body 1B bottom, drive member 40 is configured in institute's allocation of the second side box body 1B, it can be free to slide on this above-below direction.In addition, the upper slitter that is arranged in the second side box body 1B hold collection portion of spring portion 93 below cutter hold collection portion of spring portion 90 and hold cutter and hold spring 78, on the stop ditch 99 above the next door 92 of the medial surface that is arranged on the second side box body 1B, embed the upper end of the main leaf 70a of conductive plate 70, the Extendible flake 70b that makes conductive plate 70 with more cooperate than stop ditch 99 by the cooperating recesses 94 that is provided with on the second last side box body 1B medial surface, collection and fixing conductive plate 70 in the second side box body 1B, along the length direction of the second side box body 1B, more leaning on the overcurrent disconnecting apparatus 47 of having fixed bimetallic 46 on the stator 70d that is contained in conductive plate 70 in the central space than next door 92.In addition, the contact of the top of the limiter 58c by making movable core (stopper element) 58 limits movable core (stopper element) 58 and moves from the contact chip 106 that the stator 71c of the second side box body 1B medial surface and conductive plate 71 is oppositely arranged.

The central portion of the dead eye 30 that is provided with the movable contact 4A that links to each other with bimetallic 46 with classification track 79 and the position fixed between the leading section of travelling contact 3A are embedded among the dissected valley 40a of drive member 40, the last side shaft 44a that connects pressing spring 44 that inserts the guide hole 45a that has worn guide plate 45 is inserted the axis hole of handle 6, and the dead eye 30 the following side shaft 44b that connects pressing spring 44 that inserts the guide hole 45b that has worn guide plate 45 inserts movable contact 4A links to each other with handle 6 coupling member 43 with movable contact 4A.At this moment, the top ends of following side shaft 44b that has run through the dead eye 30 of movable contact 4A is embedded in the guide channel 103 that the below of the axis hole 49 of the second side box body 1B medial surface is provided with along above-below direction, be accompanied by moving up and down of coupling member 43, with side shaft 44b under guide channel 103 guiding.The second side box body 1B goes up near the locator protrusions 105 that protrudes upward guide channel 103 lower ends in the next door 95 that is provided with and forms on the Width of the second side box body 1B, handle 6 is put into make position, coupling member 43 moves downwards, under the state of contact portion closure, near the sheet 45c that stretches out that is provided with the guide hole 45b of the downside of guide plate 45 contacts with being decided to be projection 105, has determined the position (with reference to Fig. 8) of coupling member 43.

So, in the second side box body 1B, one side, by from horizontal embedding, behind the parts beyond the terminal block 10A that holds in the recess 9 of installation middle housing 7 and this middle housing 7, releasing handle 17, this recovery spring 21, the middle housing 7 that terminal block 10A, releasing handle 17 and this recovery spring 21 have been installed at recess 9 is contained in the second side box body 1B, one side.

At this, after the certain position of the first side box body 1A is provided with middle housing 7, just ride on the recess 15a of cross wall 15 at the front end sidepiece of the fixed contact 12A that is provided with on the terminal block 10A, the axle that does not show among the figure in addition embeds in the recess 37 of removing handle 17 '.

Under this state, coincidence is connected with the second side box body 1B the first side box body 1A.At this moment, make from the second side box body 1B to the first side box body 1A one stretch out short transverse up and down and the claw-like on the top of two elasticity locking plates 100 that are provided with respectively on the direction of both ends screw portion 101 and screw portion's 102 cooperations with the quilt of the overshooting shape of the corresponding setting of the first side box body 1A, one side, with regard to the fixedly connected first side box body 1A and the second side box body 1B, constituted body 1.When unclamping being connected and fixed of this first side box body 1A and the second side box body 1B, from being screwed portion 102 at the first side box body 1A and each ... the hole (not shown) of respectively removing of corresponding opening is inserted screwdriver, push (compressing) each elasticity locking plate 100 upward to the top ... the portion that screws 101, by unclamping the state that screws that each is screwed portion 102, just can pull down the second side box body 1B from the first side box body 1A.

At this, the top medial surface of the ectocentral bottom of the length direction of the first side box body 1A forms the rectangular plate shape gusset 110 that stretches out to the second side box body 1B, if connect the first side box body 1A and the second side box body 1B, assembling body 1, as shown in Figure 6, classification track 79 just is clipped between the front end face and the second side box body 1B medial surface of gusset 110, by gusset 110, the position that can determine classification track 79 with the direction of displacement (length direction of body 1) of bimetallic 46 side one side of the Width of the bimetallic 46 of quadrature roughly.Therefore, during the displacement of bimetallic 46 described later, classification track 79 can not become obstacle, and classification track 79 is difficult to have influence on the placement property of bimetallic 46.

As previously discussed, the length direction one end inside that connects the body 1 that constitutes behind first, second side box body 1A, the 1B, hold, be provided with the cutter that is used to sandwich contact rod at above-below direction and hold spring 78,81, for to hold spring 78,81 corresponding with these cuttves, in an end of body 1, the contact rod that forms opening and be コ word shape on the end face of body 1 and two sides inserts ditch 107,108.

In addition, parallel a pair of electric wire insertion holes 16A, the 16B of opening obliquely of forming on the other end of the length direction of body 1.And in patchhole 16A, 16B, insert the electric wire of each load one side, and link to each other with each terminal block 10A, 10B, if contact rod and cutter are held spring 78,81 to link to each other, just can in circuit, insert the circuit breaker of present embodiment.

At this, as shown in Figure 5,, can on Width, make body 1 miniaturization on the short transverse of body 1 by the second contact portion that the first contact portion that is made of fixed contact 2A, travelling contact 3A and fixed contact 2B, travelling contact 3B constitute is set.In addition, by the nearly central configuration first contact portion at the Width of body 1, a side end disposes the second contact portion on the Width of body 1, the opposing party's end on the Width of body 1 (end of the first side box body 1A, one side) configuration disconnects spring 53, just can make the load stabilisation in the first and second contact portions.In addition, as shown in Figure 1, be used in cross wall 15 that the second side box body 1B go up to be provided with, longitudinal wall 33, with the drive member 40 of longitudinal wall 33 configured in parallel, the isolated first contact portion and the second contact portion, thus can guarantee between two contact portions sufficient insulation distance is arranged.

Below, with reference to Fig. 1 and Fig. 7～Figure 11, be illustrated with regard to the action of present embodiment.

Fig. 1 represents to disconnect (off) state, and under this off-state, the operating portion 6a of handle 6 stands upside down from fenestra 50 and exposes, and the retainer 60 of the rearward end of movable contact 4A and stopper element 58 is a lock-out state.Then, by disconnecting spring 53, drive member 40 upwards (makes progress on short transverse in the figure of body 1, below identical), run through the movable contact 4A of the dissected valley 40a of drive member 40, its free end is in the state that is moved upward, in addition, run through the elastic force of the movable contact 4B of dissected valley 40b owing to this spring, free end is in the state of opening from fixed contact 2A, the 2B branch of correspondence (off-state) in the state that is moved upward at travelling contact 3A, the 3B of each free end setting.

Under this state, if the operating portion 6a of the counter clockwise direction turning handle 6 in the figure, as shown in Figure 7, the last side shaft 44a that connects pressing spring 44 is pressed towards the below, coupling member 43 is from meeting the following side shaft 44b of pressing spring 44, with the rearward end that is locked on the retainer 60 is fulcrum, along clockwise direction movable contact 4A is rotated, and makes free-ended travelling contact 3A near fixed contact 2A.In addition, rotation by movable contact 4A, drive the drive member 40 that movable contact 4A has run through dissected valley 40a, move down, move by this, the movable contact 4B of dissected valley 40b that has run through drive member 40 makes free-ended travelling contact 3B contact fixed contact 2B towards the direction bending that free end is moved down.At this, because the distance (distance between the contact of the second contact portion of off-state) that moves before the travelling contact 3B contact fixed contact 2B is shorter than the distance (distance between the contact of the first contact portion) that moves before the travelling contact 3A contact fixed contact 2A, so the contact fixed contact 2B of travelling contact 3B elder generation that the displacement before contact is short, the second contact portion closure (with reference to Fig. 7).

Then, if continue operating portion 6a along counter clockwise direction turning handle 6, then have flexual movable contact 4B further crooked the time, movable contact 4A rotates along clockwise direction, make travelling contact 3A contact fixed contact 2A, the first contact portion closure.If from continuing operating portion 6a here along counter clockwise direction turning handle 6, as shown in Figure 8, the last side shaft 44a that side shaft 44a connects pressing spring 44 from the line of the center of rotation of the position that connected the following side shaft 44b that connects pressing spring 44 and handle 6 moves towards the dextrad the figure, under this state, make handle 6 along right handed handle spring 51, the disconnection spring 53 that drive member 40 is upwards leaned on, make movable contact 4A downward connect pressing spring 44 and the equilibrium of movable contact 4A spring force, the locking-in state that has kept the retainer 60 of the rearward end of movable contact 4A and stopper element 58 has been kept the closure state (on state) of Fig. 8.

Under this closure state, by the spring force (restoring force) that connects pressing spring 44, the downward power of effect on movable contact 4A, when obtaining the contact pressure of travelling contact 3A and fixed contact 2A, by the drive member 40 that movable contact 4A is driven downwards, on movable contact 4B, also act on downward power,, obtain the contact pressure of travelling contact 3B and fixed contact 2B by this power.In the present embodiment promptly, by being constituted and connect pressing spring 44 by turning round helical spring, what can produce first and second contact portions when closed connects pressures (contact pressure), there is no need to be provided with in addition the spring of generation contact pressure, number of components can be cut down, thereby assembling work can be simplified to body 1.In addition, under closure state, on guide plate 45, be provided with stretch out sheet 45c and the locator protrusions 105 of body 1 contact in, guiding meets the following side shaft 44b of pressing spring 44 in the guide channel 103 on being arranged on body 1, therefore, limited the motion of the following side shaft 44b that connects pressing spring 44, travelling contact 3A, 3B are correctly contacted respectively with fixed contact 2A, 2B.

Under closure state, if operating portion 6a along clockwise direction turning handle 6, then when the position of the last side shaft 44a that connects pressing spring 44 surpasses the pivot that has connected handle 6 left and connect the line of position of following side shaft 44b of pressing spring 44, described spring force etc. balanced destroyed, when coupling member 43 relied on the elastic force that connects pressing spring 44 to move up, the elastic force that handle 6 relies on handle spring 51 rotated rapidly and resets to disconnecting (off) side.By moving up of drive member 40, movable contact 4A to counterclockwise rotating, moves up free end to be locked in position, the rear end fulcrum of retainer 60, makes travelling contact 3A leave fixed contact 2A, disconnects the first contact portion (with reference to Fig. 7).In addition, to counterclockwise rotating, drive drive member 40 by movable contact 4A, make it to move up, therefore, need not be to pressing down movable contact 4B, just recovered original state by this spring force, free-ended travelling contact 3B separates from fixed contact 2B, and the second contact portion disconnects.As previously discussed, distance between the contact of the second contact portion is shorter than the distance between the contact of the first contact portion, and because form movable contact 4B with having flexual spring material, so movable contact 4B crooked under off-state returns to original state, make travelling contact 3B from fixed contact 2B separately before, travelling contact 3A separates (with reference to Fig. 7) from fixed contact 2A, then, the movable contact 4B that returns to original state moves up travelling contact 3B, makes travelling contact 3B from fixed contact 2B separately.

; when closure; suppose that travelling contact 3A has contacted the occasion of fixed contact 2A, because movable contact 4A is made of rigid body before the travelling contact 3B contact fixed contact 2B; even want turning handle 6; movable contact 4A is not crooked yet, and drive member 40 can not be moved further, so limited moving of movable contact 4B; thereby can stop travelling contact 3B contact fixed contact 2B, the second contact portion closure.Therefore, when off-state switches to closure state closed, the second contact portion of earth electrode one side (travelling contact 3B and fixed contact 2B) is necessarily closed earlier than the first contact portion (fixed contact 2A and travelling contact 3A) of voltage pole one side, when switching the disconnection of position off-state from closure state, the second contact portion of earth electrode one side necessarily disconnects after the first contact portion than voltage pole one side.As a result, when disconnecting, can prevent that big electric current from flowing through the second contact portion of earth electrode one side or electric arc takes place, thus can be with the second contact portion of the not high cheap contactor material of durability as earth electrode one side.

In addition, because only have coupling member 43 between handle 6 and movable contact 4A, movable contact 4A directly is locked on the stopper element 58, thus compared with the past, can reduce number of components, simplified construction, and make to the assembling operation transfiguration of body 1 easy.At this, with (for example than the member that forms movable contact 4A, copper alloy) also hard member (for example iron) forms stopper element 58, and for the width dimensions of the rearward end of movable contact 4A, the width dimensions of the retainer 60 of stopper element 58 is bigger, embed the retainer 60 of stopper element 58 so can prevent the rearward end of movable contact 4A, can make the load stabilisation on the retainer 60.

And, the movable contact 4B of the movable contact 4A of voltage pole one side and earth electrode one side moves freely in same direction (short transverse of body 1), on body 1, drive member 40 being set to and can being free to slide along the moving direction of movable contact 4A, 4B, so simplified the structure of drive member 40, can easily install to body 1.

In described closure state as shown in Figure 8, if in load, flow through overcurrent, bimetallic 46 is owing to overcurrent is generated heat, bending displacement is at this, as shown in Figure 9, the bimetallic 46 that hangs down from the top is subjected to displacement, the lower end is moved towards the left-hand among the figure, and making the bottom of bimetallic 46 is fulcrum by the stopper element (movable core) 58 that leaf spring 59 connects with the limiter 58c that contacts with the last contact chip 106 that is provided with of the second side box body 1B, rotates along clockwise direction.Thus, the retainer 60 that is provided with on the stopper element (movable core) 58 is moved to the left, the locking-in state of the rearward end of movable contact 4A is disengaged, by disconnecting the elastic force of spring 53, drive member 40 moves up, so movable contact 4A is a fulcrum with the following side shaft 44b that connects pressing spring 44, along counterclockwise rotating, and movable contact 4B is pressing down based on drive member 40 not, return to original state, as shown in figure 10, travelling contact 3A, 3B are divided from fixed contact 2A, 2B respectively open, force to make the first and second contact portions to disconnect.At this moment, same with above-mentioned disconnection action, movable contact 4B crooked under closure state returns to original state, before travelling contact 3B separates from fixed contact 2B, travelling contact 3A from fixed contact 2A separately, so when moving based on the disconnection of overload electric current, the first contact portion of voltage pole one side disconnects earlier than the second contact portion of earth electrode one side.

Then, because circuit breaker, bimetallic 46 returns to original state.In addition because the locking-in state of the rearward end of movable contact 4A has been disengaged, described spring force etc. balanced destroyed, handle 6 since the elastic force of handle spring 51 to disconnection (off) side rotate rapidly, when restoring, coupling member 43 moves up.

In addition, as shown in Figure 8, under described closure state, if the such big electric current of short circuit current flows through, produce magnetic force on the fixed iron core 57 of the electromagnetic drive part 48 of formation overcurrent disconnecting apparatus 47, attract corresponding movable core (stopper element) 58, and it is shaken.Thus, same with the above-mentioned disconnection action that causes based on short circuit current, as shown in figure 11, the retainer 60 that is provided with on the movable core (stopper element) 58 is moved to the left, the locking-in state of the rearward end of movable contact 4A is disengaged, by disconnecting the elastic force of spring 53, drive member 40 moves up, so movable contact 4A is a fulcrum with the following side shaft 44b that connects pressing spring 44, along counterclockwise rotating, movable contact 4B based on the pressing down of drive member 40, does not return to original state, make travelling contact 3A, 3B is respectively from fixed contact 2A, 2B separately makes the first and second contact portions force to disconnect.At this moment, same with based on the disconnection of short circuit current action the time, movable contact 4B crooked under closure state returns to original state, before travelling contact 3B separates from fixed contact 2B, travelling contact 3A from fixed contact 2A separately, so when moving based on the disconnection of short circuit current, the first contact portion of voltage pole one side disconnects earlier than the second contact portion of earth electrode one side.

Then, because circuit breaker, the fixed iron core 57 of electromagnetic drive part 48 no longer produces magnetic force, and movable core (stopper element) 58 is because the spring force of leaf spring 59 returns to original state.In addition, the locking-in state of the rearward end of movable contact 4A has been disengaged, described spring force etc. balanced destroyed, handle 6 since the elastic force of handle spring 51 to disconnect (off) side rotate rapidly, when restoring, coupling member 43 moves up.

; in the present embodiment; upwards promptly rely on the direction that travelling contact 3A is separated from fixed contact 2A owing to disconnect spring 53 drive member 40; so as previously discussed; by overcurrent disconnecting apparatus 47; when the first and second contact portions are disconnected; because the locking-in state based on stopper element 58 is disengaged; so the tie point (meeting the following side shaft 44b of pressing spring 44) with coupling member 43 and movable contact 4A is a fulcrum; movable contact 4A is along counterclockwise rotating, distance little (with reference to Figure 10) between distance (with reference to Fig. 1) between the contact of the travelling contact 3A of off-state and fixed contact 2A is than the contact of tripped condition.As a result, when forcing to disconnect, can cut off the electric arc that the first contact portion produces rapidly, can shorten opening time.

In addition, the movable contact 4B that is formed by leaf spring is when drive member 40 moves down, crooked downwards, and be disengaged from the locking-in state of this case of bending movable contact 4A, after the restriction that moves up of drive member 40 no longer existed, return to original state, so when the pressure of above-mentioned contact portion disconnects, for drive member 40 effect actuating force upwards, can easily prevent the deposited of the first contact portion that electric arc causes from movable contact 4B.The elastic force that disconnects spring 53 acts on the drive member 40 as actuating force, therefore, can more easily prevent the deposited of the first contact portion that electric arc causes.

The invention effect

The present invention 1 circuit breaker comprises: the body that holds main circuit; By body pivotal support and handle that can freely rotate; First travelling contact that has first fixed contact and contact, separate, and the first contact portion that inserts the voltage pole of main circuit with first fixed contact; Second travelling contact that has second fixed contact and contact, separate, and the second contact portion that inserts the earth electrode of main circuit with second fixed contact; The interlock along with the rotation of handle when first travelling contact is moved, is difficult to first movable contact that deflection ground forms at least on the moving direction of first travelling contact on the direction that contacts, separates with first fixed contact; By the drive member of first movable contact driving; With the drive member interlock, when on the direction that second travelling contact contacts, separates with second fixed contact, moving, on the moving direction of second travelling contact, has flexual second movable contact at least.When between off-state and closure state, switching the second contact portion, the distance that makes distance that second travelling contact moves and first travelling contact is moved when switching the first contact portion between off-state and closure state is short, so when switching to closure state closed from off-state, the second contact portion of earth electrode one side is necessarily closed earlier than the first contact portion of voltage pole one side, when closure state switches to the disconnection of off-state, the second contact portion of earth electrode one side necessarily disconnects after the first contact portion than voltage pole one side, the result, disconnect, when closed, can prevent to flow through big electric current in the second contact portion of earth electrode one side, or generation electric arc, thereby can useful life longevity not high cheap contactor material is as the second contact portion of earth electrode one side.

2 the circuit breaker according to the present invention, in the present invention 1 circuit breaker, first and second movable contacts move freely on same direction, and the moving direction that drive member is configured to make it along first and second movable contacts freely slides.Therefore, drive member is taked simple structure, can be easily mounted in the body.

3 the circuit breaker according to the present invention in the present invention 2 circuit breaker, has been set up in parallel the first contact portion and the second contact portion on the short transverse of body, institute is so that body can miniaturization on Width.

4 the circuit breaker according to the present invention, in the present invention 3 circuit breaker, the top ends of first and second movable contacts has been fixed first and second travelling contacts respectively, comparing more by the position configuration of cardinal extremity one side drive member with the top of first and second movable contacts, with the direction of drive member approximate vertical on, be provided with the longitudinal wall that the cross wall that is present between the first and second contact portions and the moving direction from the end face of drive member one side of this cross wall along drive member stretch out on the body.By cross wall and longitudinal wall are set on body, can guarantee has sufficient insulation distance between the second contact portion of the first contact portion of voltage pole one side and earth electrode one side.

5 the circuit breaker according to the present invention in the present invention 3 circuit breaker, forms second movable contact with the leaf spring that makes second travelling contact rely on the direction of separating from second fixed contact.When disconnecting, second movable contact by being made of leaf spring acts on actuating force on drive member, therefore, can easily prevent the deposited of the first contact portion that electric arc causes.

6 the circuit breaker according to the present invention, in the present invention 5 circuit breaker, substantial middle at the Width of body is provided with the first contact portion, an end at the Width of body is provided with the second contact portion, and the disconnection spring that drive member is relied on make the direction that the first and second contact portion disconnects is set in another end of the Width of body.When disconnecting, by disconnecting spring, therefore, can easily prevent the deposited of the first contact portion that electric arc causes to drive member effect actuating force, and the load stabilisation that the first and second contact portions are born.

7 the circuit breaker according to the present invention, in the present invention 6 circuit breaker, short transverse along body is provided with drive member, it is mobile that it can be free to slide, the disconnection spring that is made of compression helical spring is installed between drive member and body, and location and the fixing fixed part that disconnects the end of spring are set respectively on drive member and body, thus can prevent the buckling of the disconnection spring that constitutes by compression helical spring, thus can drive drive member exactly.

Claims (7)

1. circuit breaker is characterized in that:

Comprise:

The body that holds main circuit;

By body pivotal support and handle that can freely rotate;

Have first fixed contact with first fixed contact contact, first travelling contact that separates, and the first contact portion that inserts the voltage pole of main circuit;

Have second fixed contact with second fixed contact contact, second travelling contact that separates, and the second contact portion that inserts the earth electrode of main circuit;

The interlock along with the rotation of handle, make first travelling contact with first fixed contact contact, the direction of separating on move, and on the moving direction of first travelling contact, be difficult to deflection at least and first movable contact that forms;

By the drive member of first movable contact driving;

With the drive member interlock, second travelling contact is moved on the direction that contacts, separates with second fixed contact, and on the moving direction of second travelling contact, have flexual second movable contact at least;

And, making the distance that when between off-state and closure state, switching the second contact portion second travelling contact is moved, the distance that during than the switching first contact portion between off-state and closure state first travelling contact is moved is shorter;

2. circuit breaker according to claim 1 is characterized in that:

First and second movable contacts can freely be moved on same direction, and the moving direction that drive member is configured to make it along first and second movable contacts freely slide.

3. circuit breaker according to claim 2 is characterized in that:

The first contact portion and the second contact portion on the short transverse of body, have been set up in parallel.

4. circuit breaker according to claim 3 is characterized in that:

Top ends at first and second movable contacts is fixed first and second travelling contacts respectively, and disposes drive member on the position of comparing more close cardinal extremity one side with the first and second travelling contact tops; And body is provided with: with the approximately perpendicular direction of the moving direction of drive member on, be present in the cross wall between the first and second contact portions; With end face from drive member one side of this cross wall, the longitudinal wall that stretches out along the moving direction of drive member;

5. circuit breaker according to claim 3 is characterized in that:

The leaf spring that utilization drives towards the direction that second travelling contact is left from second fixed contact forms second movable contact.

6. circuit breaker according to claim 5 is characterized in that:

On the position of the substantial middle of the Width of body, the first contact portion is set, and on an end of the Width of body, the second contact portion is set, on another end of the Width of body, be provided with the disconnection spring that drives drive member towards the direction that the first and second contact portion is disconnected simultaneously.

7. circuit breaker according to claim 6 is characterized in that:

Short transverse along body is provided with drive member and it can freely be slided, and, the disconnection spring that is made of compression helical spring is installed between drive member and body, on drive member and body, is provided with the fixed part that is used to locate and fix the end that disconnects spring simultaneously respectively.

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