JP3555508B2 - Circuit breaker - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a two-pole type circuit breaker that opens and closes two-pole contacts by operating a handle.
[0002]
[Prior art]
In this type of circuit breaker, two fixed contacts are juxtaposed in such a manner that two fixed contacts are juxtaposed in the width direction of the body and each of them is separated from each other. It is necessary to widen the insulation interval, and there is a problem in that the width of the body is increased. Therefore, the present applicant has proposed a circuit breaker as disclosed in Japanese Patent Application Laid-Open No. 5-47291. In this device, two fixed contacts are arranged side by side in the height direction of the body, so that the width of the body can be reduced.
[0003]
[Problems to be solved by the invention]
In the circuit breaker described above, the fixed contacts are arranged side by side in the height direction of the body, so that the width of the body can be reduced, but this time, the height is increased. There was a problem that it would.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a circuit breaker that can reduce the width and height of a body and thus can be made compact. To provide.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, a body having a handle that can be operated from the outside, two fixed contacts arranged side by side in the width direction of the body, and a movable contact opposing each of these fixed contacts so as to be able to come and go. And two opening / closing mechanisms for driving these two moving contacts. The movable contacts are brought into and out of contact with the fixed contacts via the opening / closing mechanism by turning on / off the handle. In the circuit breaker, the fixed contacts and the movable contacts are vertically arranged in a height direction of the body.A partition member for isolating each of the fixed contacts, and each of the fixed contacts is separately housed in two sections divided by both side walls in the width direction of the body and the partition member, and an exhaust hole of the upper fixed contact is provided. Is formed above the body in one section, and the exhaust hole of the lower fixed contact is formed below the body in the other section, and the fixed contact is fixed to one end and the other end is fixed. And two fixed contacts having a conductor connecting portion for connecting a conductor are provided, and the partition member extends substantially parallel to the side wall of the body between the fixed contacts and the upper fixed contact side. A vertical wall portion for accommodating the upper fixed contact with the outer wall of the lower wall, and extending from the lower end of the vertical wall substantially in parallel with the bottom surface of the body, and fixing the lower stage together with the side wall of the body on the lower fixed contact side. The horizontal wall for accommodating the conductor connection part of the contact, and the upper fixed contact A bulging portion that protrudes from the vicinity of the fixed contact in the direction of the side wall of the body on the lower fixed contact side and abuts against the side wall of the body on the lower fixed contact side; The fixed contact of the lower fixed contact is housed over both side walls of the body by the portion and both side walls of the body.It is characterized by the following.
[0011]
Claim2In the invention of the claim,OneIn the invention, the opening / closing mechanism includes a rotatable crossbar having a cut groove communicating with each section by horizontally inserting and inserting each movable contact from both sides individually, and on both side walls of the partition member and the container body. A stop piece is provided in which each movable contact is separated from each fixed contact and a tip end surface of the crossbar on the movable contact side abuts.
[0012]
Claim3In the invention of the claim,2The invention according to the fifth aspect, characterized in that a concave-convex engaging portion is provided on a tip end surface of the stop piece and the crossbar.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0015]
As shown in FIG. 1, the circuit breaker according to the present embodiment includes a housing 1 formed by butt-joining a first side case 1A and a second side case 1B made of synthetic resin on both sides. Two fixed contacts 2A and 2B arranged side by side in the width direction, two fixed contacts 2A and 2B, and two movable contacts 4A and 4B to which the fixed contacts 3A and 3B opposing so as to be able to come and go, are fixed. An opening and closing mechanism 5 for driving the two movable contacts 4A and 4B is provided, and the movable contacts 3A and 3B are brought into contact with and separated from the fixed contacts 2A and 2B via the opening and closing mechanism 5 by turning on and off the handle 6. The fixed contacts 2A, 2B and the movable contacts 4A, 4B are vertically arranged in the height direction of the body 1, and two fixed contacts 2A, 4B are fixed in the height direction. One movable contact 4B interposed between the contacts 2A and 2B, When the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, the movable contacts 2A of the movable contact 4A do not cross each other when viewed from the width direction of the body 1. It is located at the height position.
[0016]
A partition member (hereinafter referred to as an intermediate case) formed of a synthetic resin material containing a hydroxide of alkaline earth metal (for example, Mg hydroxide) so as to be sandwiched between the two cases 1A and 1B in one end of the housing 1. 7), and a fixed contact 2A is provided at one end in a section defined by a concave portion 8 inside the side wall (outer wall) of the first side case 1A and a vertical wall portion 35 of the intermediate case 7. The terminal block 10A, which is a fixed-side electric circuit configuration, is housed therein, and the lower side is placed in a section formed by the concave portion 9 provided on the second side case 1B side of the intermediate case 7 and the side wall (outer wall) of the second side case 1B. A terminal block 10B, which is a second fixed-side electric circuit having a fixed contact 2B at one end, is housed therein.
[0017]
The terminal block 10A is integrally extended upward from one end of a lower piece of the terminal plate 11 bent into a U shape, and is bent at a right angle to the extension piece 11a from an upper end of the extension piece 11a. A fixed contact 12A extending outwardly and integrally with the fixed contact 11; a fixed contact 2A caulked and fixed to the upper surface of one end of the fixed contact 12A; , A lower piece of the terminal plate 11 is placed on the downwardly inclined bottom surface of the recess 8 of the first side case 1A, and a rising wall at one end of the recess 8 is formed. The extension piece 11a is arranged along the upper wall 8a, and the fixed contact 12A is led out of the recess 8 beyond the upper end of the rising wall 8a, and the rising wall 8a and the partition wall 14 rising from the bottom of the first side case 1A. Between recess 8 Parts and by arranging the tip portion of the fixed contact 12A on the fixed contact arrangement 15 which is integrally formed to be inclined in the same manner, the terminal block 10A is disposed as shown in FIG. 19 in the recess 8. The fixed contact disposing portion 15 is formed with a concave portion 15a for releasing the lower end of the fixed contact 2A protruding from the lower surface side of the fixed contact 12A. The terminal plate 11 is integrally formed with a T-shaped piece 11b extending upward from the other end of the upper piece, and one end of a side protruding portion at the upper end of the T-shaped piece 11b is attached to the inner surface of the first side case 1A. It is placed on the upper end surface of the formed convex flat portion 22. Further, a projection 23 which is inserted into the holding piece 13b of the locking spring 13A and prevents rattling of the locking spring 13A is integrally formed on the side surface of the side piece of the terminal plate 11.
[0018]
The lock spring 13A and the terminal plate 11 constitute a quick connection terminal as a conductor connection portion. When the intermediate case 7 is overlapped on the first side case 1A, a vertical wall portion at the other end of the first side case 1A is formed. Is inserted from the outside through an obliquely downward wire insertion hole 16A formed by a diagonally downward groove 160 having a semicircular cross section and an obliquely downward groove 160 having a similar shape formed on a wall formed on the opposite wall surface of the intermediate case 7. The core wire of the electric wire 111 (see FIG. 7) is press-fitted between the upper piece of the terminal plate 11 and the upper end of the locking piece 13a of the locking spring 13A and the upper end of the holding piece 13b. By locking the core in the pull-out direction of 111 and pressing the core against the upper piece of the terminal plate 11 at the upper end surface of the holding piece 13b, the core is electrically connected and mechanically held. Has become. The electric wire lock is released by a release handle 17. The release handle 17 is rotated by a rotation shaft 18 provided on a lower side surface into a shaft hole 20 provided on a convex flat portion 22 on the inner side surface of the first side case 1A. A shaft 36, which is freely supported and protrudes from the wall surface of the vertical wall portion 35 of the intermediate case 7, is rotatably supported in a concave portion 37 provided on the lower side surface. When the operating portion 17a exposed to the outside is manually operated and rotated counterclockwise, the drive projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13A to lock it. The lock 13a is bent so that the lock on the core wire can be released. In the figure, reference numeral 21 denotes a return spring which constantly biases the release handle 17 clockwise.
[0019]
On the other hand, the terminal block 10B is basically composed of a terminal plate 11, a locking spring 13B and a fixed contact 12B like the terminal block 10A, but unlike the terminal plate 11 of the terminal block 10A, The terminal plate 11 of the block 10B extends the extension piece 11c downward from one end of the lower piece, and extends the fixed contact 12B from the tip of the extension piece 11c so as to be parallel to the bottom of the body 1. Further, a back piece 11d extending at a right angle from one end of the side piece of the terminal plate 11 is formed.
[0020]
The lock spring 13B has the same structure as that of the lock spring 13A. The lock spring 13B is mounted on the lower piece of the terminal plate 11, and the projection 23 protruding from the side piece of the terminal plate 11 is inserted into the holding piece 13b. It has become.
[0021]
The terminal block 10B constitutes the bottom of the recess 9 of the intermediate case 7, and the lower piece of the terminal plate 11 is placed on the horizontal wall 24 extending substantially parallel to the bottom of the container 1, and the terminal block 10B One end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of the vertical wall 25 and one end of the horizontal wall portion 24, and the extension piece 11c is recessed. When the intermediate case 7 is overlaid on the first side case 1A side, the front end of the fixed contact 12B, that is, the lower surface on which the fixed contact 2B is provided, is placed at the bottom of the first side case 1A. Are mounted on the ribs 26, 26. That is, the fixed contact 2B is disposed between the two cases 1A and 1B in a space formed between the lateral wall portion 24 of the intermediate case 7, a bulging portion 30 described later, and the side walls of the two cases 1A and 1B. The recess between the ribs 26, 26 serves as a relief for the lower end portion of the fixed contact 2B fixed to the tip of the fixed contact 12B and protruding from the lower surface side of the fixed contact 12B.
[0022]
Further, the tip of the side protruding portion at the upper end of the T-shaped piece 11b formed to extend from the other end of the upper piece of the terminal plate 11 is the upper end face of the convex flat portion 22 'formed on the wall surface of the intermediate case 7. Placed on
[0023]
The locking spring 13B of the terminal block 10B and the terminal plate 11 constitute a quick-connecting terminal as a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is overlaid on the second side case 1B, the intermediate case 7 is provided in the vertical wall at the other end of the concave portion 9 and has a semicircular cross-sectionally downward groove 160 provided in the vertical wall at the other end of the second side case 1B. When an electric wire is inserted from the electric wire insertion hole 16B formed by the obliquely downward groove 160, the core wire is locked by the locking piece 13a of the locking spring 13B, and the core wire is fixed to the upper piece of the terminal plate 11 by the holding piece 13b. The wires are electrically connected by pressing and mechanically locked.
[0024]
A release handle 17 'is used to release the electric wire lock. The release handle 17' is provided with a rotating shaft 18 provided on the lower side surface on the convex flat portion 22 'of the intermediate case 7, similarly to the release handle 17 described above. The shaft 38 rotatably supported by the shaft hole 20 and protruding from the inner wall surface of the second side case 1B is rotatably supported by a concave portion 37 formed on the side surface. When the operation portion 17a exposed to the outside is manually operated and rotated, the drive projection 19 provided at the lower end pushes the tip of one side end of the lock piece 13a of the lock spring 13B to bend the lock piece 13a. However, the locked state can be released. In the drawing, reference numeral 21 'denotes a return spring which constantly biases the release handle 17' clockwise.
[0025]
As shown in FIG. 11, the intermediate case 7 protrudes toward the second side case 1B with respect to the vertical wall portion 35 substantially parallel to the side walls of the two cases 1A and 1B, and bulges into contact with the inner surface of the side wall of the second side case 1B. The wall which forms the part 30 and hangs down from the lower surface of the bulging part 30 is the vertical wall 25, the side wall facing the second side case 1 </ b> B side, the bottom wall 31, the vertical wall 32 at one end, and the ceiling wall 33. Is provided on the first side case 1A side. When the intermediate case 7 is abutted against the first side case 1A, the front end side of the fixed contact 12A of the terminal block 10A assembled on the first side case 1A side is on the step surface 31a of the bottom wall 31 of the recess 34. And the ceiling wall 33 is arranged along the lower surface of the horizontal wall 29 projecting from the inner surface of the first side case 1A. A groove 31b is formed in the step surface 31a to allow the lower end of the fixed contact 2A swaged and fixed to the fixed contact 12A. The vertical wall 32 has an opening 39 for inserting the free end of the movable contact 4A corresponding to the fixed contact 2A into the recess 34.
[0026]
The opening / closing mechanism 5 for driving the movable contacts 4A and 4B to open and close includes a first operating plate 43 serving as a latch member, a crossbar 40, and a stepped locking portion 57 for locking one end of the first operating plate 43. It comprises a tripping plate 41, a second tripping plate 42, an operating plate 43 serving as a latch member, a handle 6, a U-shaped link 44, and the like, and additionally drives the opening / closing mechanism 5 when an overcurrent is detected. Two bimetals 45, 46 and electromagnetic driving units 47, 48 for driving the opening / closing mechanism 5 when a short-circuit current flows are added to form a common part.
[0027]
The handle 6 includes an operating portion 6a, a rotating portion 6b, and a handle shaft 6c. A handle shaft 6c protruding from the center of both side surfaces of the rotating portion 6b is formed on an inner surface of the first side case 1A. The hole 49 and the shaft hole 49 formed in the inner surface of the second side case 1B are rotatably inserted into the hole 49 and held between the two cases 1A and 1B. It faces the window hole 50 opened on the upper surface of the container 1 configured in a state of being overlapped and connected. A torsion spring 51 is mounted on the handle shaft 6c, and the torsion spring 51 urges the handle 6 in the off-operation direction at the on-operation position (see FIG. 22).
[0028]
An upper shaft 44a of a link 44 is rotatably inserted into a shaft hole 52 provided at a lower end of the rotating portion 6b, and is connected to the operating plate 43 via the link 44.
[0029]
The operation plate 43 is connected to the handle 6 via the link 44 by inserting the lower shaft 44b of the link 44 into the bearing holes 43a provided on both sides at the center, and is disposed within the body 1 so as to be vertically movable.
[0030]
The crossbar 40 is formed by inserting shafts 40a protruding from both upper side surfaces into shaft holes 52, 52 formed in inner surfaces of both cases 1A, 1B and pivotally supported between the cases 1A, 1B. As shown in FIG. 12, a cut groove 54 for fitting the side of the movable contact 4A from the lateral side is provided on the side of the first side case 1A slightly below the shaft 40a, and the lower side of the second side case 1B. Each of the portions is provided with a cut groove 55 into which the movable contact 4B is fitted from the lateral direction. The movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B at the movable contact side end surface by the stop pieces 130 projecting from the inner surfaces of the side walls of the intermediate case 7 and the two cases 1A, 1B. A concave groove 131 engaged in the state and abutting on the bottom is formed in the width direction.
[0031]
Here, the movable contact 4A is formed of a rigid conductive metal plate, is inserted from the side into the cut groove 54 of the cross bar 40, and has a rear lower surface and a concave portion 54a provided in the concave portion 54a provided behind the cut groove 54. The rear part is urged upward by a contact pressure coil spring 53 that is compressed and arranged between the movable contact 4A and the bottom of the movable contact 4A when the crossbar 40 rotates about the shaft 40a. Is rotated about the opening edge of the incision 54 so that the movable contact 3A caulked and fixed to the free end is separated and brought into contact with the corresponding fixed contact 2A.
[0032]
The movable contact 4B is made of a conductive spring thin plate. When the crossbar 40 rotates counterclockwise in FIG. 19, the movable contact 4B is pressed downward and bends, and from this bent state, the crossbar 40 turns clockwise. When it moves, it returns, and the movable contact 3B caulked and fixed to the tip is brought into contact with and separated from the fixed contact 2B by the bending and the return.
[0033]
The lower end of the crossbar 40 is pushed by a coil spring 62 that is compressed and arranged between the lower end and a wall 63 suspended from the bottom of the first side case 1A, and the clockwise rotational force in FIG. Is energized.
[0034]
The first release plate 41 has a shaft portion 41a, a protruding portion 41b protruding above the shaft portion 41a, and a side piece having a surface orthogonal to the shaft portion 41a closer to the second side case 1B side of the shaft portion 41a. 41c and an arm piece 41d integrally extending from the upper end of the side piece 41c to one end thereof. Both ends of the shaft 41a are inserted into shaft holes 56, 56 provided on the inner side surfaces of both cases 1A, 1B. A locking portion 57 to which one end (right end in FIG. 19) of the operation plate 43 is engaged and disengaged is provided at the upper end of the protruding portion 41b. A receiving portion 88 that is pushed and driven by the driving portion 58a of the movable iron core 58 of the electromagnetic driving portion 47 is formed at the upper end of the 41d. On the side surface of the second side case 1B below the side piece portion 41c, a receiving portion 59 which is pushed and moved by the facing portion 42a provided on the lower end portion end surface of the second tripping plate 42 is formed. A locking portion 61 for locking both ends of a torsion spring 60 for fitting the ring portion to the shaft portion 41a is provided on the side surface. In addition, on the side surface of the first side case 1A below the side piece portion 41c, the first side which is opposed to the lower end of the bimetal 45 hung down from the conductive plate 71 fixedly holding the electromagnetic driving portion 47 and is pushed when the bimetal 45 is bent and displaced. A drive section 69 is provided.
[0035]
The second tripping plate 42 is formed at the center of the end surface of the separation wall 65 as a partition formed integrally with the shaft hole 42b in the center from the upper side to the bottom side of the first side case 1A on the inner side of the first side case 1A. Since the provided shaft body 66 is inserted and rotatably supported between the two cases 1A and 1B, the movable core 67 of the electromagnetic drive unit 48 is driven on the lower end surface opposite to the above-described facing portion 42a. A receiving portion 68 that is pushed and driven by the portion 67a is provided. The upper end of the second release plate 42 is opposed to the upper end of the bimetal 46 suspended from the rear end of the movable contact child 4B holding the electromagnetic drive unit 48 on the side surface on the first side case 1A side. There is provided a second drive unit 70 that is pressed when the lens is bent.
[0036]
As shown in FIG. 13, the conductive plate 71 made of a thin metal material is formed by being bent in an inverted L-shape. The electromagnetic driving portion 47 is fixed to the outer piece 71a, and is formed in a U-shape from the tip of the outer piece 71a. The bimetal 45 is hung down by welding and fixing a horizontal piece of the upper end inverted L-shaped portion of the bimetal 45 to the stepped surface at the lower end of the inner piece 71b which is turned back and made parallel to the outer piece 71a.
[0037]
As shown in FIG. 13, the electromagnetic driving unit 47 includes a fixed iron core 74 in which a magnetic iron plate is bent in reverse L and both ends of a vertical piece thereof are bent at right angles to form a U-shaped horizontal section, a movable iron core 58, and a movable iron core 74. A plate spring 73 for swingably and opposingly supporting the iron core 58 on the magnetic pole surfaces of both ends of the fixed iron core 74 is provided. Inserting between the inner piece 71a and the inner piece 71b, the inverted T-shaped piece 76 hanging from the center of the both sides of the outer piece 71a is engaged with the cutout groove 75a at the center of both sides of the flat plate 75. The fixed iron core 74 is fixed to the conductive plate 71 as shown in FIG.
[0038]
The movable core 58 protrudes from the surface on the fixed core 74 side, and the projections 58b, 58b are inserted into holes 73b, 73b formed at the upper end of the central piece 73a of the leaf spring 73 and caulked and fixed to the leaf spring 73. The leaf spring 73 is movably supported, and the leaf spring 73 is arranged so that both side pieces 73c, 73c formed by bending both sides of the central piece 73a are arranged along the outer surfaces of both sides 74a, 74a of the fixed core 74. The locking pieces 73d, 73d protruding inward at the tips of the fixed iron core 74 are fixed to the fixed iron core 74 by being locked in concave portions 74b, 74b formed in the outer corners of the fixed iron core 74.
[0039]
The magnetic pole surface, which is the tip of both side pieces 74a, 74a of the fixed iron core 74, faces the movable iron core 58 via the center piece 73a of the leaf spring 73 and the both side pieces 73c, 73c, and causes an excessive amount of short-circuit current. When a current flows through the conductive plate 71, the movable core 58 is attracted and oscillated by the magnetic force generated on the magnetic pole surfaces of the both side pieces 74 a, 74 a of the fixed core 74, and protrudes from one end surface of the movable core 58. The driving unit 58a is moved.
[0040]
The adjusting screw 77 is screwed into the screw hole 76 provided at the center of the flat plate 75 from the insertion hole 72 of the outer piece 71a of the conductive plate 71, and the tip is inserted into the horizontal piece of the upper inverted L-shaped portion of the bimetal 45. The initial position of the lower end of the bimetal 45 can be adjusted by causing the inner piece 71b to bend by causing the adjusting screw 77 to advance by being opposed via the base 71b (see FIG. 17).
[0041]
At the lower end of the vertical piece 71c of the conductive plate 71, a blade receiving spring portion 78 sandwiching a conductive bar (not shown) provided in the distribution board is welded and fixed, and a plate surface slightly above the lower end of the bimetal 45 is fixed. The other end of the braided wire 79 having one end welded to the movable contact 4A is welded, and the blade receiving spring portion 78A, the conductive plate 71, the bimetal 47, the braided wire 79, and the movable contact 4A are electrically connected. ing.
[0042]
On the other hand, as shown in FIG. 15, the movable contact 4B holding the electromagnetic drive section 48 is folded back in a U-shape with the rear end as an outer piece to form an inner piece 80 parallel to the rear end. A horizontal piece of the lower L-shaped bent portion of the bimetal 46 is placed on the stepped surface at the upper end of the bimetal 46 and fixed by welding to make the bimetal 46 stand up.
[0043]
The electromagnetic drive unit 48 includes a fixed core 74 ′, a leaf spring 73 ′, and a movable core 67 formed in the same shape as the electromagnetic drive unit 47, and a flat plate 75 ′ formed integrally with the fixed core 74 ′. Is inserted between the rear end of the movable contact 4B and the inner piece 80, and the center of both ends of the rear end of the movable contact 4B is inserted into the cutout groove 75a 'at the center of both sides of the flat plate 75'. The stationary iron core 74 'is fixed to the rear end of the movable contact 4B as shown in FIG. 16 by engaging the more vertical T-shaped piece 76'.
[0044]
The movable core 58 ′ is protruded from the surface on the fixed core 74 ′ side, and a projection (not shown) is inserted into holes 73 b ′, 73 b ′ formed at the upper end of the central piece 73 a ′ of the leaf spring 73 and caulked. As a result, the leaf spring 73 'is swingably supported by the leaf spring 73'. The leaf spring 73 'is formed by bending both side pieces 73c', 73c 'formed on both sides of the central piece 73a', on both sides 74a ', 74a' of the fixed iron core 74 '. A locking piece (not shown) protruding inward at the tip of both side pieces 73c ', 73c' is disposed along the outer surface of , 74b 'is fixed to the fixed iron core 74.
[0045]
The magnetic pole surface, which is the tip of both side pieces 74a ', 74a' of the fixed iron core 74 ', faces the movable core 67 via a gap between the center piece 73a' of the leaf spring 73 'and the both pieces 73c', 73c '. When an excessive current such as a short-circuit current flows through the movable contact 7B, the movable core 67 is attracted and oscillated by the magnetic force generated on the magnetic pole surfaces of the both side pieces 74a 'and 74a' of the fixed iron core 74 '. 'The drive unit 67a protruding from one end face is moved.
[0046]
The adjusting screw 77 ′ is screwed into the screw hole 76 ′ provided at the center of the flat plate 75 ′ from below through the insertion hole 81 provided at the rear end of the movable contact 4 </ b> B. The upper end position of the bimetal 46 can be adjusted by causing the inner piece 80 to bend by causing the adjustment screw 77 to advance by facing the horizontal piece of the part via the inner piece 80 (FIG. 17).
[0047]
On the plate surface slightly below the upper end of the bimetal 46, a braid in which one end is welded to a blade receiving spring portion 81 sandwiching a conductive bar (not shown) disposed in the distribution board similarly to the blade receiving spring 78 described above. The other end of the wire 82 is welded, and electrically connects the blade receiving spring portion 81, the bimetal 46, and the movable contact 4B. The blade receiving spring 81 is housed in a frame 83 made of a synthetic resin molded product.
[0048]
When assembling the circuit breaker of the present embodiment, first, the terminal block 10A is housed in the recess 8 of the first side case 1A, and the release handle 17 is assembled in a fixed position together with the return spring 21. Further, the handle 6 is assembled together with the torsion spring 51 at a predetermined position, and the blade receiving spring portion 78 is housed in a blade receiving spring portion housing portion 90 provided near the bottom of one end as shown in FIG. The vertical piece 71c is arranged along the L-shaped gap between the partitions 91 and 92 of the first side case 1A, and the outer piece 71a is arranged parallel to the upper surface of the upper horizontal wall portion 92a of the partition 92. The electromagnetic drive unit 47 and the bimetal 45 are arranged on the left side wall surface (see FIG. 19) of the separation wall 65 formed on the inner side surface of the first case 1A. At this time, the semicircular rib 103 protruding from the inner side surface of the first side case 1A fits into the U-shaped bent portion of the outer piece 71a of the conductive plate 71 and the inner piece 71b for positioning.
[0049]
Then, the movable contact 4A is fitted into the cutout 54 of the crossbar 40, and the coil spring 53 is housed in the recess 54a. The operating plate 43 is connected to the handle 6 by a link 44 and disposed. Further, the electromagnetic drive unit 48 and the bimetal 46 are housed in the space between the separation wall 65 and the partition wall 92, and the blade receiving spring portion 81 together with the frame portion 83 is mounted on the blade receiving spring portion 81 of the first side case 1A. The upper blade receiving spring accommodating portion 93 is located above the spring portion accommodating portion 90. At this time, a locking claw 83b at a lower end of a support piece 83a integrally extended from a lower portion of the frame portion 83 is locked in a locking hole 94 formed in the first side case 1A as shown in FIG. A semi-circular projection 97 supporting and projecting from the inner surface of the front wall of the first side case 1A supports the lower portion of the frame portion 83.
[0050]
The obliquely upwardly inclined portion at the center of the movable contact 4B is parallel to the bottom in the direction toward the other end of the first side case 1A from the lower end of the separation wall 65 located slightly above the bottom of the first side case 1A. Further, the movable contact 4B is disposed between the partition wall 95 extended upwardly inclined from the parallel portion and the bottom of the first side case 1A, and the free end side of the movable contact 4B is inserted through the cutout portion 14a of the partition wall 14. It is arranged in the space where the fixed contact 12B is arranged. At this time, the movable contact 4B is fixed by sandwiching the rear end of the movable contact 4B with ribs 96 projecting from the lower surface of the parallel portion of the partition 95 and the bottom of the first side case 1A. At this time, a semicircular rib 103 'protruding from the inner side surface of the first side case 1A is fitted into the U-shaped bent portion between the rear end portion and the inner piece 80, and is positioned.
[0051]
Further, the first release plate 41 is rotatably disposed at a fixed position together with the torsion spring 60, and the second release plate 41 is further rotatably disposed at a fixed position.
[0052]
In this way, as shown in FIG. 19, the parts other than the intermediate case 7 and the terminal block 10B housed in the recess 9 of the intermediate case 7, the release handle 17 'and its return spring 21' are arranged on the first side case 1A side. After assembling, the intermediate case 7 in which the terminal block 10B, the release handle 17 ', and the return spring 21' are assembled in the concave portion 9 is disposed so as to overlap the first side case 1A.
[0053]
Here, when the intermediate case 7 is arranged at a fixed position on the first side case 1A side, the free end side of the movable contact 4A is arranged in the recess 34 through the opening 39 of the vertical wall 32 and the terminal block The tip side of the fixed contact 12A provided on 10A is placed on the step surface 31a of the bottom wall 31, and the shaft 36 is fitted into the concave portion 37 of the release handle 17.
[0054]
On the other hand, the fixed contact 12B provided on the terminal block 10B is placed on the rib 26 on the bottom of the first side case 1A. The lower surface of the downward step formed at the end of the intermediate case 7 is placed on a flat surface formed on the end wall of the first side case 1A.
[0055]
In this state, the second side case 1B is overlapped with the first side case 1A side and joined. At this time, the hook-shaped hooking locking portions 101 at the tips of the four upper and lower elastic locking pieces 100... Which are integrally protruded from the first side case 1A to the second side case 1B side are located on the second side case 1B side. The first side case 1A and the second side case 1B are locked and fixed to the corresponding protruding hooked portions 102 to form the body 1 (FIGS. 1, 4). 7 and the like). When the first side cases 1A and 1B are disengaged from each other, the driver 151 is inserted into the second side case 1B from each release hole 150 opened corresponding to each hooked portion 102. By pressing the hooking locking portion 101 of the locking pieces 100 upward to release the hooking state with the hooked portion 102, the second side case 1B can be removed from the first side case 1A.
[0056]
By attaching the second side case 1B, the shaft 40a of the crossbar 40 and the shaft portion 41a of the first release plate 41 are rotatable in the shaft holes 52 and 56 provided on the inner surface of the second side case 1B. Is inserted into
[0057]
In addition, the heads of the adjusting screws 77 and 77 'corresponding to the bimetals 45 and 46 respectively face the opening 104 opening on the upper surface of the container 1 and the opening 105 opening on the bottom thereof. At this time, the operation adjusting screws 77, 77 'are screwed through the openings 104, 105 so as to obtain the optimum operating point, and the initial positions of the bimetals 45, 46 are changed from FIG. 17 (a) to FIG. 17 (b). The adjustment is performed as shown, and after the adjustment, the upper lid 106 and the lower lid 106 ′ are fitted into the respective portions of the body 1 by using the elasticity thereof to cover the openings 104 and 105.
[0058]
Here, the bimetals 45 and 46 are juxtaposed so that a part of the bimetal 45 overlaps with the longitudinal direction of the body 1 with the width direction of the body 1 as a width direction, thereby reducing the size of the body 1 in the width direction. Further, since the displacement directions are set outward, the initial position at which no displacement occurs is known in advance. Even if the bimetals 45, 46 are displaced, they do not approach the initial position more than the initial positions. Makes work easier. In other words, if they are displaced in the same direction, it is necessary to check the displaced amount and dispose them, and the disposing work of the bimetals 45 and 46 becomes cumbersome. In the present embodiment, there is no such troublesomeness. .
[0059]
Further, since the separation wall 65 which is a partition wall is present between the bimetals 45 and 46, the interval between the bimetals 45 and 46 can be reduced, and the opening / closing mechanism 5 and the contact portion accommodated in the body 1 are provided. It has enough space. Furthermore, since the braided wires 79 and 82 connected to the bimetals 45 and 46 are routed from above and below the container 1, the work of routing the braided wires 79 and 82 is facilitated.
[0060]
Blade receiving spring portions 78 and 81 for vertically sandwiching the conductive bar are housed and arranged inside one end of the container 1, and one end of the container 1 corresponds to the blade receiving spring portions 78 and 81. In the portion, conductive bar insertion grooves 107 and 108 which are open in a U-shape are formed on the end face and both side faces of the body 1.
[0061]
A pair of electric wire insertion holes 16A and 16B opened obliquely upward are formed in parallel at the other end of the body 1.
[0062]
Further, the fixed contact 2B and the movable contact 3A which are disposed in the lower end of the two sections divided by the side walls of the two cases 1A, 1B and the intermediate case 7 are provided on the lower end surfaces of the wire insertion holes 16A, 16B. An exhaust hole 109 for exhausting gas generated by the opening and closing of the container 1 and a locking hole 112 for mounting the body are opened, and further, on the upper surface of the other end of the body 1, as shown in FIG. An exhaust hole 110 is opened to exhaust gas generated by opening and closing the fixed contact 2A and the movable contact 3A, which are arranged obliquely upward.
[0063]
These exhaust holes 109 and 110 are vertically separated and the directions facing the outside of the body 1 are separated from each other. Therefore, the discharge directions of the arcs generated at the time of the forced opening are different from each other, and the arcs of the both poles are mixed. Can prevent short circuit between the electrodes. Here, an exhaust hole 110 shown in FIG. 18 is a laterally projecting rib facing the opening of the leading end rib 113 of the inner intermediate case 7, the ribs 114, 114 projecting to the side surfaces of the release levers 17, 17 and the exhaust holes 110 of the cases 1A, 1B. Since the exhaust gas is guided obliquely upward by the wall 115, it is difficult for the exhaust gas to intersect with the exhaust gas exhausted from the lower exhaust hole 109.
[0064]
Thus, if the electric wires 111, 111 on the load side are inserted into the electric wire insertion holes 16A, 16B and connected to the respective terminal blocks 10A, 10B, and the conductive bars are connected to the respective blade receiving spring portions 78, the present embodiment can be used as an electric circuit. A circuit breaker can be inserted. In the drawing, reference numeral 112 denotes a locking hole for fixing the body.
[0065]
Next, the operation of the present embodiment will be described with reference to FIGS.
[0066]
FIG. 20 shows the off state. In this off state, the operating portion 6a of the handle 6 is in an inverted state exposed from the opening 50, and the engagement state between one end of the operating plate 43 and the first release plate 41 is It is in a detached state. The crossbar 40 is urged by the coil spring 62 so as to rotate clockwise in the drawing, and the movable contact 4A inserted through the cut groove 54 of the crossbar 40 moves the free end upward. The movable contact 4B inserted through the cut groove 55 has its free end moved upward by its spring elastic force, and the movable contacts 3A, 3B provided at the respective free ends have the movable contacts 3A, 3B. It is in a state of being separated from the corresponding fixed contacts 2A, 2B.
[0067]
When the operating portion 6a of the handle 6 is rotated clockwise in this state, the upper shaft 44a of the link 44 is pushed downward, and the link 44 pushes down the operation plate 43 by the lower shaft 44b. When the operation plate 43 is pressed down, one end (right end in the figure) of the operation plate 43 hits the locking portion 57 of the first release plate 41, and the operation plate 43 rotates counterclockwise about the position as a rotation center, As shown in FIG. 21, the other end (left end) of the operation plate 43 hits a projection 84 provided at the upper end of the crossbar 40, and rotates the crossbar 40 counterclockwise against the bias of the spring.
[0068]
Due to this rotation, the movable contact 4B inserted into the cut groove 55 of the crossbar 40 bends in a direction to move the free end downward, and the movable contact 3B at the free end comes into contact with the fixed contact 2B. Further, the movable contact 4A inserted through the cut groove 54 rotates counterclockwise to bring the movable contact 3A at its free end into contact with the fixed contact 3B. This contact is delayed more than the movable contact 3B contacts the fixed contact 2B.
[0069]
Here, since the movable contact 4B obtains a contact pressure by its own elasticity, a spring means for the contact pressure is unnecessary, and since it is not necessary to make an electric circuit connection by using a braided wire, the work for incorporating parts and the braiding No wire connection work is required, improving productivity.
[0070]
When the handle 6 is further rotated clockwise, the upper shaft 44b moves leftward from a line connecting the position of the lower shaft 44b of the link 44 and the rotation center of the handle 6, as shown in FIG. As a result, the torsion spring 51 of the handle 6, the coil spring 62 for urging the cross bar 44, and the spring force of the movable contact 4 B are balanced so that one end of the operation plate 43 and the locking portion 57 of the first release plate 41 are Are held, and the ON state of FIG. 22 is maintained. FIG. 23 shows the above-mentioned ON state in a state where the trip plates 41 and 42 are removed.
[0071]
When the operating portion 6a of the handle 6 is turned counterclockwise in the ON state, the position of the upper shaft 44a of the link 44 moves rightward beyond a line connecting the rotation center of the handle 6 and the lower shaft 44b. In order to move upward, the latched state between the left end of the operation plate 43 and the locking portion 57 of the first release plate 41 is released, and the crossbar 40 rotates clockwise by the urging force of the coil spring 62, and 6 is rapidly rotated and returned to the off side by the urging force of the torsion spring 51. The clockwise rotation of the crossbar 40 causes the movable contact 4A to rotate clockwise to move the free end upward, thereby separating the movable contact 3A from the fixed contact 2A. In addition, the movable contact 4B is no longer depressed downward, and returns to the original state by the spring force, and the movable contact 3B at the free end is separated from the fixed contact 2B. This separation is later than the separation of the movable contact 3A from the fixed contact 2A. This delay is the same also at the time of forced opening described later.
[0072]
Here, since the opening and closing of the contact portions of the two poles is delayed as described above, the arc generated at the time of opening and closing the contacts is only the movable contact 4A on the rigid body side, and the arc of the movable contact 3B made of a spring material. Can be prevented.
[0073]
Arcs generated at the contact portions of the two poles are generated in the respective sections, and since the exhaust directions of the exhaust holes 109 and 110 are different, a short circuit between the electrodes due to the arc can be prevented.
[0074]
Further, stop pieces 130 formed in both cases 1A and 1B and the intermediate case 7 are engaged with the groove 131 formed in the width direction of the distal end surface of the cross bar 40 which rotates when the contact portion is separated, and the groove 131 is formed. To prevent the arc generated in one section from escaping from the crossbar 40 on the back side of the body 1 and entering the other section. Prevent short circuit.
[0075]
The space near the fixed contact 2A of the upper fixed contact 12A is widened by the bulging portion 30 of the intermediate case 7 between the side walls of the two cases 1A and 1B, and the fixed contact 2B of the lower fixed contact 12B is formed. Since the space in the vicinity is a wide space between the side walls of both cases 1A and 1B, the gas pressure due to the arc generated when each contact portion is opened can be reduced, and cracks in both cases 1A and 1B due to the gas pressure. And damage can be prevented.
[0076]
Further, since the intermediate case 7 is formed of a resin material containing Mg hydroxide, carbon generated at the time of opening the contact portion can be oxidized to prevent insulation deterioration due to carbon.
[0077]
When an overcurrent flows through the load in the above-described ON state shown in FIG. 22, the bimetals 45 and 46 generate heat due to the overcurrent and bend and displace. Here, the bimetal 45 hanging down from above is displaced such that the lower end moves leftward in the figure, and the bimetal 46 hanging up is displaced such that the upper end moves rightward in the figure, and as shown in FIG. The lower end pushes the first drive section 69 of the first release plate 41 to the left, and the upper end of the bimetal 46 pushes the second drive section 70 of the second release plate 42 to the right. That is, the free ends of the bimetals 45 and 46 are displaced away from each other. This displacement causes the first and second tripping plates 41 and 42 to rotate clockwise. At this time, the facing portion 42a of the second tripping plate 42 pushes the receiving portion 59 of the first tripping plate 41 to perform the first pulling. A clockwise turning force is applied to the detaching plate 41.
[0078]
Here, since the energizing directions of the bimetals 45 and 46 are opposite to each other, when a large current flows, magnetic forces are generated in the bimetals 45 and 46 in directions away from each other. Therefore, the bending displacement of the bimetals 45 and 46 can be made quick, and as a result, the forced opening can be made faster. This operation is also effective at the time of forcible opening by a short-circuit current described later.
[0079]
When the first release plate 41 rotates clockwise, the latching state between the locking portion 57 and one end (right end) of the operation plate 43 is released, and the operation plate 43 is centered on the lower shaft 44 b of the link 44. It will rotate clockwise. Therefore, the regulation of the crossbar 40 by the other end (left end) of the operation plate 43 is eliminated, and the crossbar 40 rotates clockwise by the spring force of the coil spring, and turns off the movable contacts 4A and 4B as shown in FIG. The movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.
[0080]
Thereafter, the bimetals 45 and 46 return to the original state due to the interruption of the electric circuit, and the first tripping plate 41 returns to the original position by the bias of the torsion spring 60, and at the same time, the opposing portion 42a of the second tripping plate 42 is disengaged. The receiving portion 59 pushes and moves the second release plate 42 back. The handle 6 is turned in the off direction (counterclockwise) by the bias of the torsion spring 51.
[0081]
Further, in the above-mentioned ON state, when an excessive current such as a short-circuit current flows, a magnetic force is generated in the fixed cores 74, 74 'of the electromagnetic driving units 47, 48, and the corresponding movable cores 58, 67 are attracted and swung. . Thereby, as shown in FIG. 25, the driving portion 58a of the movable iron core 58 pushes the receiving portion 89 of the first tripping plate 41, and the driving portion 67a of the movable iron core 67 pushes the receiving portion 68 of the tripping plate 42, respectively. Is rotated clockwise. When the first release plate 41 rotates clockwise in the same manner as when an overcurrent flows, the latching state between the locking portion 57 and one end (right end) of the operation plate 43 is released, and the operation plate 43 is connected to the link 44. Is rotated clockwise about the lower shaft 44b. Therefore, the regulation of the crossbar 40 by the other end (left end) of the operation plate 43 is eliminated, and the crossbar 40 is rotated clockwise by the spring force of the coil spring 62 to return the movable contacts 4A and 4B to the off state. The movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.
[0082]
Thereafter, when the magnetic force is no longer generated in the fixed iron cores 74, 74 'of the electromagnetic drive units 47, 48 due to the interruption of the electric circuit, the movable iron cores 58, 67 return to the original state due to the spring force of the leaf spring, and the first release plate 41 becomes By the bias of the torsion spring 60, it returns to the original position, and at the same time, the second release plate 44 is pushed and moved to the original position. The handle 6 is turned in the off direction (counterclockwise) by the bias of the torsion spring 51.
[0083]
Here, since the electromagnetic driving parts 47 and 48 are arranged so that the directions of suction to the fixed iron cores 74 and 74 ′ of the movable iron cores 58 and 67 are opposite to each other, the movable iron core 58 even if vibration is applied. , 67 move in the direction in which they are sucked and the other in the direction in which they are sucked by vibration, so that the force for rotating the first and second tripping plates 41, 42 in the latching direction is either one of them. Since it is obtained only by the movement of the movable iron core, it is not possible to obtain a force for pulling out the first tripping plate 41 against the urging force of the torsion spring 60, so that a malfunction due to vibration can be prevented.
[0084]
【The invention's effect】
The invention according to claim 1 is a container having a handle operable from the outside, two fixed contacts arranged side by side in the width direction of the container, and a movable contact opposing each of these fixed contacts so as to be able to come and go. Circuit breaker, comprising: two movable contacts to which the two fixed contacts are fixed; and an opening / closing mechanism for driving the two movable contacts, and each movable contact being brought into contact with and separated from each fixed contact via the opening / closing mechanism by turning on / off a handle. In the above, the fixed contacts and the movable contacts are vertically arranged in the height direction of the body, so that the fixed contacts and the movable contacts are arranged side by side in the width direction of the body and the height of the body is increased. Since it is arranged vertically in the vertical direction, the width direction in the body between each fixed contact and each movable contact and the vertical direction in the body between each fixed contact and each movable contact can be narrowed. It is necessary to increase the width and height of the body No, there is an effect that attained the compactness of the device body.
AlsoA partition member for isolating the fixed contacts is provided. Each fixed contact is divided and housed in two sections divided by both side walls in the width direction of the container and the partition member, and an exhaust hole of the upper fixed contact is formed in one section. Since the exhaust hole of the lower fixed contact is formed below the body in the other section, the multi-pole fixed contact can be isolated by the partition member, so that the multi-pole fixed contact The gap between them can be narrowed, the size can be further reduced, and each exhaust hole is formed on the upper and lower stages of the body by separating various types by the partition member, so arcs generated at the time of forced opening of contacts When it comes out of the body, various arcs are less likely to be mixed, and a short circuit between poles can be prevented.This has the effect.
Further, two fixed contacts having a conductor connection portion for fixing the fixed contact to one end and connecting a conductor to the other end are provided, and the partition member is provided between the fixed contacts with respect to the side wall of the body. A vertical wall portion that extends substantially parallel to the upper stationary contactor side and accommodates the upper stationary contactor together with a side wall of the upper stationary contactor side, and extends from the lower end of the vertical wall portion substantially parallel to the bottom surface of the lower body and extends downward. A lateral wall portion for accommodating the conductor connection portion of the lower fixed contact together with the side wall of the body of the fixed contact on the side of the fixed contact, and from the vicinity of the fixed contact of the upper fixed contact to the side wall of the body on the lower fixed contact on the side of the fixed contact. A bulging portion that bulges out and abuts against the side wall of the lower fixed contactor-side body, and the fixed contact of the lower fixed contactor is formed by the lateral wall portion, the bulging portion, and both side walls of the body. Since it is stored over both side walls of the body, the vicinity of the fixed contact of the upper fixed contact is When the movable contact arranged in each section is separated from the fixed contact, it can be widened between the outer walls, and the fixed contact near the lower fixed contact can be widened between both outer walls of the body. The gas pressure due to the arc generated in the gas can be reduced, and there is an effect that cracking or breakage of the container due to the gas pressure is easily prevented.
[0090]
Claim2The invention of claimOneIn the invention, the opening / closing mechanism includes a rotatable crossbar having a cut groove communicating with each section by horizontally inserting and inserting each movable contact from both sides individually, and on both side walls of the partition member and the container body. Since a stop piece is provided in which each movable contact is separated from each fixed contact and the end surface of the crossbar on the movable contact side contacts, an arc generated when each movable contact is separated from each fixed contact. Thus, there is an effect that the possibility of a short-circuit between poles due to an arc can be prevented by reducing the possibility that the gas enters the other section from the crossbar side on the back side of the body.
[0091]
Claim3The invention of claim2In the invention of the above, since the concave and convex engaging portions are provided on the distal end surfaces of the stopper and the cross bar,AndSince the concavo-convex engagement portion is formed on the end surface of the crossbar, there is no possibility that the arc generated in the upper or lower section directly enters the lower or upper section as it is.Item 2In addition to the effect, there is an effect that a short circuit between poles due to an arc can be prevented.
[Brief description of the drawings]
FIG. 1 is a sectional view taken along the line BB of FIG. 3 showing a main part of the present invention.
FIG. 2 is an exploded perspective view of the same.
FIG. 3 is a side view of the same.
FIG. 4 is a sectional view taken along the line AA in FIG. 3 of the above.
FIG. 5 is a sectional view taken along the line CC of FIG.
FIG. 6 is a perspective view of the same.
FIG. 7 is a front view of the same.
FIG. 8 is a top view of the above.
FIG. 9 is a bottom view of the above.
FIG. 10 is a rear view of the same.
FIG. 11 is an enlarged perspective view of the intermediate case.
FIG. 12 is an enlarged exploded perspective view in which a part of the crossbar portion is omitted.
FIG. 13 is an exploded perspective view of a structural part of the upper electromagnetic drive unit and the upper bimetal in the same.
FIG. 14 is a perspective view of a structure of an upper electromagnetic drive unit and an upper bimetal according to the first embodiment;
FIG. 15 is an exploded perspective view of a structural portion of a lower electromagnetic drive unit and a lower bimetal according to the first embodiment.
FIG. 16 is a perspective view of a structure of a lower electromagnetic drive unit and a lower bimetal of the above.
FIG. 17 is an explanatory view of adjusting the bimetal according to the embodiment.
FIG. 18 is an enlarged perspective view of a part of the upper exhaust hole, which is partly omitted and broken, for explaining the structure of the upper exhaust hole.
FIG. 19 is a side view showing a state where members are assembled to the first side case of the above.
FIG. 20 is a state explanatory view of the above-mentioned off state.
FIG. 21 is an explanatory diagram of a state during transition to the on state in Embodiment 1;
FIG. 22 is an explanatory diagram of an on-state of the above.
FIG. 23 is an explanatory diagram showing an on-state in a state where the tripping plate is removed.
FIG. 24 is a diagram illustrating a state of a trip operation due to an overcurrent according to the embodiment.
FIG. 25 is a state explanatory diagram of the instantaneous interruption state due to the excessive current.
[Explanation of symbols]
1 body
1A First side case
1B Second side case
2A, 2B fixed contact
3A, 3B movable contact
4A, 4B movable contact
12A, 12B Fixed contact

Claims (3)

A body having a handle that can be operated from the outside, two fixed contacts juxtaposed in the width direction of the body, and two movable contacts having fixed movable contacts opposed to these fixed contacts so as to be able to come and go freely. A circuit breaker that includes an opening and closing mechanism that drives these two movable contacts, and that causes each of the movable contacts to contact and separate from each of the fixed contacts via an opening and closing mechanism by turning on and off the handle. A fixed contact and each movable contact are vertically arranged in the height direction of the body, a partition member for isolating the fixed contacts is provided, and the fixed contacts are provided on both side walls in the width direction of the body. And divided into two compartments divided by a partition member, and an exhaust hole of the upper fixed contact is formed above the body in one compartment, and an exhaust hole of the fixed contact in the lower compartment is formed in the other compartment. Formed below the vessel, Two fixed contacts having a conductor connecting portion for fixing a contact to one end and connecting a conductor to the other end are provided, and the partition member is provided between the fixed contacts and a side wall of the body. A vertical wall portion extending substantially parallel to the outer wall of the upper fixed contact and accommodating the upper fixed contact, and a lower fixed contact extending from a lower end of the vertical wall substantially parallel to the bottom surface of the container body; A lateral wall portion accommodating the conductor connection portion of the lower fixed contact together with the side wall of the lower body, and bulging from the vicinity of the fixed contact of the upper fixed contact in the direction of the side wall of the lower fixed contact side. A bulging portion that abuts against the side wall of the container at the lower fixed contactor side, and the fixed contact of the lower fixed contactor is formed by the lateral wall portion and the bulging portion and both side walls of the container. A circuit breaker which is housed on both side walls of a body . The opening and closing mechanism includes a rotatable crossbar having a cut groove communicating with each section by inserting each of the movable contacts from side to side individually, and on both side walls of the partition member and the container, 2. The circuit breaker according to claim 1 , wherein a stop piece is provided for contacting a tip end surface of the crossbar on the movable contact side in a state where each movable contact is separated from each fixed contact . 3. The circuit breaker according to claim 2 , wherein a concave / convex engaging portion is provided on a distal end surface of the stop piece and the crossbar .

Images