JP2988133B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a circuit breaker in which a neutral wire led out to a ground side line of an electric circuit is improved.

[0002]

2. Description of the Related Art Conventionally, there is a distribution board shown in FIG. 39 which houses this type of circuit breaker.

[0003] That is, a main breaker 231 is disposed at the upper center of the distribution board 225, and the main bars 232, 233 connected to the load side of the main breaker 231 are suspended, and a plurality of branch breakers 234 are connected to the main bar. Arranged on both sides of 232,233, the main power bars 232,233 are connected to the power supply side line input terminal 8 of the branch breaker 234 via the branch bar 235. Further, a neutral switch 236 is disposed below the distribution board 225, and is connected to the grounding side wires of the main bars 232, 233. When power is supplied from the distribution board 225 to the load 237, the power supply side wire is led out to the load 237 from the output terminal 238 of the branch breaker 234, and the ground side wire is led out from the neutral switch 236 to the load 237.

[0004]

In the above-mentioned conventional distribution board, the power supply side line leading to the load is provided at a position away from the output terminal of the branch breaker, and the ground side line is provided at a position away from the branch breaker. Since the wires are derived from the neutral switch, the pair of wires of the power supply side wire and the grounding side wire leading to the load side need to be changed in length and routed inside the distribution board to be connected, and wiring workability is deteriorated. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a circuit breaker in which wiring work with a ground side line of an electric circuit is easy.

It is a second object of the present invention to provide a circuit breaker which can bend a neutral electric wire freely and can be easily assembled.

It is a third object of the present invention to provide a circuit breaker in which a connection operation between an output terminal side wire and a ground side wire of a neutral wire is easy.

A fourth object of the present invention is to provide a circuit breaker in which a connection place where an output terminal side electric wire and a ground side electric wire are connected has good insulation.

A fifth object of the present invention is to provide a circuit breaker in which a connection portion between an output terminal side electric wire and a ground side electric wire is hard to be removed.

[0010]

According to a first aspect of the present invention, there is provided a circuit breaker having a power supply side line of an electric circuit and a power supply side input / output terminal connected to a load at both ends, and a ground side output terminal connected to a load. A housing that is installed on one of both ends and houses a part of the neutral wire that connects the output terminal on the ground side and the ground side wire, and opens and closes the contacts that intervene between the input and output terminals on the power supply side of the circuit It has an abnormal current detection device that detects an abnormal current flowing in the mechanism section and the electric circuit, and a breaking mechanism that forcibly opens the contact in response to the abnormal current detection device, and a quenching device that extinguishes an arc generated by opening and closing the contact. The circuit breaker includes an arc device, and a lead hole for leading the neutral wire out of the housing is provided at both ends of the housing.

According to a second aspect of the present invention, there is provided a circuit breaker, wherein the neutral electric wire of the first aspect is separated into an output terminal side electric wire and a ground side electric wire, and the output terminal side electric wire has high flexibility. The configuration is such that both electric wires are connected in the housing.

According to a third aspect of the present invention, the output terminal side electric wire and the ground side electric wire of the second aspect are connected via a connecting member.

According to a fourth aspect of the present invention, there is provided a circuit breaker, wherein the housing of the second or third aspect is a vertically divided body, and an isolator for isolating an arc extinguishing device disposed in the interior of the circuit breaker is provided. The output terminal side electric wire and the ground side electric wire were connected on the side isolated by the body.

According to a fifth aspect of the present invention, there is provided a circuit breaker having a structure in which a locking portion for locking the connecting member of the third or fourth aspect is provided in the housing or the separator.

[0015]

According to the first aspect of the present invention, the lead holes for leading the neutral electric wire out of the housing are provided at both ends of the housing. Therefore, even if the grounding side line of the electric circuit is arranged near one end of the housing. The neutral electric wire can be led out from the lead-out hole closer to the ground side line.

According to the second aspect of the present invention, the neutral electric wire is separated into the output terminal side electric wire and the ground side electric wire, and the output terminal side electric wire is made to be highly flexible and connected in the housing. Therefore, in addition to the function of the first aspect, the electric wire on the output terminal side on the ground side can be freely bent and housed so as to match the space in the housing.

According to the third aspect of the present invention, the output terminal side electric wire and the ground side electric wire are connected via the connecting member. Can be connected to electric wires.

According to the fourth aspect of the present invention, the housing is a vertically divided body, and an isolator for isolating the arc extinguishing device provided in the housing is provided, and an output terminal is provided on the side isolated by the isolator. Since the side electric wire and the ground side electric wire are connected, in addition to the effect of claim 2 or claim 3, it is possible to be less affected by the arc at the time of opening and closing the contact.

According to the fifth aspect of the present invention, the locking portion for locking the connecting member is provided on the housing or the separator. The tension at the connection portion with the ground side electric wire can be removed, and it is difficult to remove.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIGS. 2 to 4 are shown in FIG. 1, FIGS. 11 to 16 are shown in FIG. 10, and FIGS.
FIG. 17 to FIG. 26 to FIG. 28, FIG. 30 to FIG. 32 to FIG. 29, and FIG. 35 to FIG. 37 to FIG. 34, respectively. It was decided to show.

That is, the housing 1 of the circuit breaker
Is formed of an insulating material such as synthetic resin, and has an input terminal 8 on the power supply side of the circuit at one end, an output terminal 9 on the power supply side of the circuit at the lower end of the other end, and an output terminal 10 on the ground side of the circuit at the other upper end. A rectangular handle projection 11 is provided at the center of the outer surface of the upper surface, and a neutral handle 214 described later sandwiched between the outer wall 13 and an inner wall 40 described later on one side of the upper surface outside.
And a window hole 12 for a neutral handle having a rectangular shape for operating the vehicle. In FIG. 1, the handle projection 11 has a rectangular operation handle window hole 14 to which an operation handle 52 to be described later is attached, and a through hole having a large diameter at the top and a small diameter at the bottom at the center and right side. Two operation holes 15 and 16 are provided, and the operation portion 82 of the operation handle 52 projects from the handle projection 11. At both ends, mounting recesses 17 and 18 for mounting to a distribution board are provided, and lead holes 19 and 20 for leading a neutral wire 216 described later are provided. Although the output terminal on the ground side is provided on the output terminal side on the power supply side according to the present embodiment, it may be provided on the input terminal side on the power supply side. Further, according to the present embodiment, the neutral wire is led out from the lead-out hole on the output terminal side on the power source side, but may be led out from the lead-out hole on the input terminal side on the power source side.

This housing 1 is vertically divided into a body 2 in which components are horizontally inserted, an isolator 3 for isolating an arc extinguishing device 25 to be described later, a terminal isolator 4, and an opening of the body 2 is closed. It consists of cover 5, body 2, terminal isolator 4 and cover
5 and are integrally fixed to the caulking holes 21 formed by the four caulking studs 22.

The interior of the housing 2 has a first section 23A in which an interrupting mechanism 24 for interrupting an electric circuit by a partition wall 23 at substantially the center and an arc extinguishing device 25 for interrupting and cooling the arc are provided. It is divided into a second section 23B in which a leakage detecting device 26 for detecting and a test button 27 are arranged. The first section 23A has a concave terminal groove 29 for mounting the input terminal 8 on the power supply side, and an exhaust port 30 for exhausting gas generated in the arc extinguishing device 25 below the terminal groove 29. Is formed. Also, this terminal groove
On the back side of 29 is the input terminal 8 on the power supply side and a bimetal
An insulating plate 31 is provided for partitioning from the insulating plate 93.

In the second section 23B, a concave terminal groove 32 for mounting the output terminal 9 on the power supply side, and a support portion 33 on which a neutral device 212 to be described later is mounted above the terminal groove 32 are provided.
And The support portion 33 is provided at one end of the contact surface 33a where the neutral movable plate 213 described later contacts the fixed contact portion 208 of the terminal plate 202 described later, and is provided at one end of the contact surface 33a. A mounting recess 33b in which the biasing spring 215 is mounted is provided. A neutral handle 214 is provided inside the body 2 above the support portion 33.
The neutral movable plate 213 has an inclined abutting portion 34 to be abutted when it is opened, and is provided at one end of the abutting portion 34. It has an insertion recess 34a to be inserted. Further, in the second section 23B, a cut groove 35 for mounting a leakage detection board 133 to be described later is formed inside the upper surface, and a recess 36 for mounting a zero-phase current transformer 129 to be described later is formed inside the lower surface. ing. Further, a side surface of the partition wall 23 is provided with a tension spring described later.
A hook shaft 37 for hooking 148 is formed. In addition, an electric leakage display device 28 for displaying an electric leakage state is provided above the partition wall 23.

The insulator 3 is provided with a neutral electric wire 21 to be described later.
6 has a locking portion 38 for locking a connection member 226 for connecting the output terminal side electric wire 216a and the ground side electric wire 216b, and a fitting projection 39 for isolating the exhaust port 30 and the outlet hole 19 from each other. The fitting projection 39 is fitted to the body 2 so as to close the arc extinguishing device 25 and a part of the blocking mechanism 24 in the first section 23A by fitting the fitting projection 39 from the side of the exhaust port 30.

The terminal separator 4 is provided with inner walls 40 and 41 for isolating the ground-side output terminal 10 from the neutral device 212 and the earth leakage detecting device 26, and is also separated by the inner walls 40 and 41 and connected to the ground-side output terminal 10. The concave terminal groove 42 for mounting
And is mounted so as to be stepwise with the terminal groove 32 of the second section 23B. Further, a through hole 43 communicating with the contact surface 33a of the support portion 33 is provided on the inner wall 40 side of the terminal groove.

The cover 5 is for closing the opening of the body 2, and is provided with a shut-off mechanism 24, an arc extinguishing device 25, and an earth leakage detecting device 26 which are disposed on the body 2 while closing the opening of the body 2. , Test button 2
7. Holds the earth leakage display device 28 and the like.

The shut-off mechanism 24 includes an opening / closing mechanism 44 for manually opening and closing the electric circuit, and an abnormal current detecting device 45 for opening the electric circuit when an abnormal current flows. The opening / closing mechanism section 44,
A movable contact 46 whose intermediate portion is pivotally supported by a first fixed shaft 54 of a frame 53 described later, an opening spring 47 for urging the movable contact 46 in the opening direction, and a first movable contact 46 A connecting link 48 having one end connected via a shaft 57 and a second link
A latch link 49 formed with a slit 71 pivotally supported by the fixed shaft 55 together with the operation handle 52 and swingably supporting a second movable shaft 58 held at the other end of the connection link 48;
A trip link 50 that is supported by a third fixed shaft 56 of 53 and latches a latch link 49, and one end is connected to a connection link 48 via a second movable shaft 58 and the other end is via a third movable shaft 59. A handle link 51 connected to an operation handle 52, an operation handle 52 held by a second fixed shaft 55 of a frame 53 together with a latch link 49, and first to third fixed shafts 54, 55 for holding these members. It comprises a frame 53 having 56 and a contact 60 interposed between the input / output terminals 8 and 9 on the power supply side.

The movable contact 46 has an elliptical slit 61a so that the intermediate portion is supported by the first fixed shaft 54 of the frame 53.
A movable contact 63 which is formed in a substantially U-shape from a pair of leg pieces 61 parallel to each other and a connecting piece 62 connecting the leg pieces 61 and one end of the connecting piece 62 comes into contact with and separates from a fixed contact 92 described later. And a projection 64 for hooking one end of the opening spring 47 to the other end of the connecting piece 62. In addition, at the approximate center of the connecting piece 62, a movable iron core 102, which will be described later, is inserted, and a round hole (not shown) for forcibly opening the movable contact 46 in the opening direction is formed. Further, a claw-shaped holding piece 65 to which the connecting link 48 is connected via a first movable shaft 57 is provided at a tip extending obliquely upward from an intermediate portion of the leg piece 61. The movable contact 46 is connected to the frame 53 via a copper stranded wire 66.

The opening spring 47 is formed in a coil shape, and has one end hooked on the projection 63 of the movable contact 46 and the other end hooked on a hook 117 of the second yoke 105, which will be described later. Child
46 is biased in the opening direction.

The connecting link 48 is composed of a pair of parallel leg pieces 67 having shaft holes at both ends, and a connecting piece 68 for connecting the leg pieces 67 from one end of the leg piece 67 near the shaft hole. A holding piece of the movable contact 46 through a first movable shaft 57 in a shaft hole at one end.
65 and the other end of the shaft hole is connected to the latch link 49 and the handle link 51 via the second movable shaft 58.

The latch link 49 has a shaft hole rotatably supported by the second fixed shaft 55, and has a slit 71 for swingably supporting the second movable shaft 58. It is composed of a pair of leg pieces 69 formed and parallel to each other, and a connecting piece 70 for connecting the leg pieces 69 from substantially the center of the leg pieces 69. That is, the connecting link 48 and the handle link 51 are swingably held in the slit 71 via the second movable shaft 58.

The trip link 50 is composed of a standing piece 72 and a side piece 73 which is integrally provided at an intermediate portion of the standing piece 72, and forms an ear piece 74 on the opposite side to the side piece 73. It is supported by the third fixed shaft 56 via a bearing hole formed in the lug 74. A latch link 49 is provided at the tip of the side piece 73 of the trip link 50.
A locking portion 75 for locking the connecting piece 70 is formed. Furthermore, the side piece 73 is inserted and supported by the third fixed shaft 56 of the frame 53 and is locked by the upper piece 106 of the first yoke 98 described later,
A torsion coil spring 76 for urging the side piece 73 toward the connection piece 70 of the latch link 49 is provided. At the upper end of the standing piece 72, a bimetal interlocking plate 77 for interlocking the deformation of the bimetal 93 and an opening 159 of a first transmission lever 146, which is provided in a direction intersecting with the bimetal interlocking plate 77, are mounted. Spear 78
Is provided at the lower end of the standing piece 72.
A movable core interlocking plate 79 to which the movement of No. 2 is interlocked is provided.

The handle link 51 is composed of a pair of parallel leg pieces 80 having shaft holes at both ends, and a connecting piece 81 for connecting the leg pieces from the center of the leg piece 80. It is connected to the connection link 48 via the second movable shaft 58, and is connected to the operation handle 52 via the third movable shaft 59 to the shaft hole at the other end.

The operating handle 52 is made of an insulating material such as a synthetic resin, and swings the operating portion 82 protruding from the handle projection 11 on the upper surface of the housing 1 and the window hole 14 of the housing 1. A pivot hole 85 held via the second fixed shaft 55 together with the swing portion 83 and the latch link 49 having a fan shape in a side view and a spring shaft hole 86 into which one end 154 of a spring 145 described later is inserted. And a base 84 which is a center of rotation. Also, a third movable shaft is provided at one end of the swing portion 83.
A protrusion 87 having a shaft hole to which the handle link 51 is connected via 59 is provided.

The frame 53 includes a frame body 88 provided integrally with the first yoke 98, and a first body attached to the frame body 88.
And a frame cover 89 connected via third fixed shafts 54, 55, 56. The frame body 88 is formed in a substantially triangular shape with an opening inside when viewed from the side, and the first to third fixed shafts 5 are provided at the apexes and two bottom sides, respectively.
It has a shaft hole into which 4, 55 and 56 are inserted.
A yoke 98 is provided integrally. Frame cover 89
Similarly to the frame body 88, the side view is formed in a substantially triangular shape with an opening inside, and first to third fixed shafts 54, 55, 56 are inserted into both ends of the apex and the bottom side. Shaft hole. From one end of the base, a leg piece 90 extending downward and a side piece 91 extending from the tip of the leg piece 90 toward the frame body 88 are connected. This frame cover
By welding one of the copper strands 66 to 89 and the other of the copper strands 66 to the movable contact 46, the frame cover 89
And the movable contact 46 are connected.

The contact 60 comprises a movable contact 63 provided on the movable contact 46 and a fixed contact 92 provided on a fixed contact 122 which will be described later, and is interposed between the input / output terminals 8 and 9 on the power supply side. doing. The movable contact 63 is a movable contact as described above.
It is provided at one end of 46 connecting pieces 62. The fixed contact 92
It is provided near a base end of a protruding piece 127 of a fixed contact 122 described later. The movable contact 63 and the fixed contact 92 are both formed of a material that is difficult to weld. According to the present embodiment, the opening / closing mechanism is of the link type, but may be of the reversing type in which the contact is rapidly reversed to one of the open position and the closed position.

The abnormal current detecting device 45 comprises a bimetal 93 for detecting an overcurrent and a detecting electromagnet 94 for detecting a short-circuit current. The bimetal 93 is formed by integrally stacking two thin plates having different coefficients of thermal expansion into a vertical piece 95 and a horizontal piece.
As a result, the whole is bent substantially in an L-shape, and generates heat and deforms in accordance with the supplied current. At the upper end of the vertical piece 95, a screw hole 95a into which the gap adjusting screw 97 is screwed is provided.
The bimetal 93 is connected to the input terminal 8 on the power supply side by welding a horizontal piece 96 to the lower end of the side piece 91 of the frame cover 89.
It is arranged near. The detection electromagnet 94 includes a first yoke 98 provided integrally with the frame 53, a fixed core 99 provided on the first yoke 98, a trip link drive rod 100 penetrating the fixed core 99, and a movable core 102. A return spring 101 for urging the movable contact 46 side, a movable iron core 102 forcibly opening the movable contact 46, a coil cylinder 103 covering them, a coil 104 for winding the coil cylinder 103, And a second yoke 105 connected to one yoke 98. The first yoke 98 has an upper piece 106 and a lower piece 107 facing each other, and is formed in a substantially U-shape via a connecting piece 108. It is provided integrally. The fixed iron core 99 has a through hole 110, the tip of which is formed in the connecting piece 108 of the first yoke 98.
109 is fitted from the inside and caulked and fixed.

The trip link drive rod 100 is entirely formed in a columnar shape longer than the fixed iron core 99, and has a through hole formed in the fixed iron core 99.
110 swingably inserted. The return spring 101 is formed in a coil shape, is compression-built between the fixed core 99 and the movable core 102, and urges the movable core 102 toward the movable contact 46. The movable iron core 102 is slidably fitted in the coil cylinder 103, and a forcibly opened pole bar 111 protruding from one end thereof protrudes outside from the small-diameter portion of the coil cylinder 103.
112 are formed and penetrate through the ball holes of the movable contact 46.
The coil cylinder 103 has a through-hole, a large-diameter portion and a small-diameter portion, and the small-diameter portion is a fitting hole for a second yoke 105 described later.
116 is fitted from inside. The coil 104 is a coil cylinder 103
And one end thereof is bent back in the axial direction and welded to a protruding piece 191 of a terminal plate 187 described later. Further, one end of the copper stranded wire 113 is welded to the other end of the coil 104, and the other end of the copper stranded wire 113 is welded to the vertical piece 95 of the bimetal 93 to connect to the bimetal 93. Second
The yoke 105 is composed of a lower piece 114 and a side piece 115 connected to the lower piece 114, and has a fitting hole 116 into which the small diameter portion of the coil cylinder 103 is fitted. At the end of the side piece 115, there is provided a latching portion 117 for latching the opening spring 47 to urge the movable contact 46 in the opening direction.

The arc extinguishing device 25 includes an arc running plate 118 for moving an arc generated when a short circuit is interrupted from the contact 60 including the movable contact 63 and the fixed contact 92; an arc extinguishing grid 119 for dividing and cooling the arc; An arc gas recirculation side plate 120 that protects the container 2 and the separator 3 from arcs and forms an arc gas circulation channel, and the separated and cooled gas is exhausted from the exhaust port 30 of the container 2. Arc running plate 118
Is composed of an arc traveling plate main body 121 and a fixed contact 122. The arc traveling plate main body 118 includes a rectangular sub-piece 123 and a square main piece 124 connected to the sub-piece 123.
It is composed of On the center line of the arc traveling plate main body 118, a projecting rib 125 extends from the sub piece 123 to the main piece 124.
Is provided to make it easier to run the arc and avoid sticking. The fixed contact 122 includes a support piece 126 having a base end connected to the arc traveling plate main body 121 and a protruding piece 127 connected from the support piece 126. A fixed contact 92 is provided. Arc extinguishing grid 119
Is formed by laminating horseshoe-shaped plates 128, and is arranged so as to cover the main piece 124 of the arc traveling plate main body 121, and cuts and cools the arc. The arc gas recirculation side plate 120 sandwiches the sub-piece 123 of the arc traveling plate 118 and the protruding piece 12 of the fixed contact 122.
7 Arranged to engage the proximal end. Also, this protruding piece 12
7 is connected to a leg piece 199 of a terminal plate 194 of an output terminal 9 on the power supply side, which will be described later, via a power supply side electric wire 128.

Next, the operation principle of the shut-off mechanism 24 will be described with reference to FIGS. 1 to 4 and FIGS. 25 to 32.

That is, the operation handle 52 is moved from FIG.
When the latch link 49 is latched by the trip link 50 from the off state side shown in FIG. 25 to the on state side shown in FIG.
The slit 71 of 49 is moved downward from above, and the link 48 is moved by the second movable shaft 58. Then, when the third movable shaft 59 moves beyond a straight line connecting the second movable shaft 58 and the second fixed shaft 55, the third movable shaft 59 is rapidly inverted, so that the movable contact 46 connected to the connection link 48 1 fixed shaft 54
, And as shown in FIGS. 25 to 28,
The movable contact 63 contacts the fixed contact 92. At this time, the first fixed shaft 54 is located in the middle of the elliptical slit 61 a provided in the middle of the movable contact 46, and applies a contact pressure to the movable contact 63. In the overcurrent trip among the trip states, when an overcurrent flows in the electric circuit in the ON state shown in FIGS. 1 to 4, the gap adjusting screw 97 gradually biases the bimetal interlocking plate 77 due to the self-heating of the bimetal 93. As a result, the trip link 50 is pushed, the connecting piece 70 of the latch link 49 is disengaged from the locking part 75, the latch link 49 is rotated by the opening spring 47, and the movable contact 46 is moved to the first fixed shaft 54. , And rotates in a direction away from the fixed contact 92. Then, as shown in FIGS. 29 to 32, the contact 60 is opened, and the movable shaft 58 is connected to the opening edge 89 of the frame cover 89.
a, the operation handle 52 is held at the neutral position. When a short-circuit current flows in the electric circuit in the ON state shown in FIGS. 1 to 4, the short-circuit trip occurs when the movable core 10 of the detecting electromagnet 94 is moved.
2 is sucked into the fixed iron core 99. As a result, the trip link drive rod 100 is pushed out and pushes the movable iron interlocking plate 79 of the trip link 50, and the trip link 50 is rotated to release the latch link 49, and the movable contact 46 is opened as described above. I do. However, before the movable contact 46 is opened by such link interlocking, that is, at the same time as the operation of the movable core 102, the flange 112 of the movable iron core 111
The movable contact 63 is fixed to the fixed contact 92
Away from That is, just before the latch link 49 is tripped, the movable contact 46 is supported by the first fixed shaft 54 as a fulcrum.
Rotates in the direction of compressing the opening spring 47 to perform the opening operation.

As shown in FIGS. 33 to 37, the leakage detecting device 26 includes a zero-phase current transformer 129 for detecting an unbalanced current in an electric circuit.
And a control circuit unit 13 for amplifying the output of the zero-phase current transformer 129.
0 and the operation unit 137 of the test button 27 described later
A movable contact plate 131 that is held so as to protrude from the fixed contact shaft 132 that generates an unbalanced current in the zero-phase current transformer 126 through a test circuit section 141 described below by contacting the movable contact plate 131. And a leakage detection board 133 to which these components are attached.
3 is disposed near the output terminal 9 on the power supply side. In addition,
The leakage detecting board and the zero-phase current transformer may be separately provided. The earth leakage detection board 133
216 form a slit 134 through which it can pass. By mounting the upper end of the leakage detection board 133 in the notch 35 of the housing 2 and the zero-phase current transformer 129 in the recess 36 of the housing 2, the leakage detection device 26 is disposed in the housing 1. ing. Further, the control circuit unit 130 includes an amplifier 135 that outputs a signal when the unbalanced current flowing through the electric circuit becomes equal to or higher than the sensitivity current,
And a switching element 136 formed of a thyristor which is turned on when a signal output from the amplifier 135 is output. Note that the switching element 136 may be composed of a transistor.

The test button 27 is actually operated from the upper surface of the housing 1 and is a substantially cylindrical operating portion 13.
7 and a leg 138 extending from the lower surface of the operation unit 137. The operation unit 137 is attached to the operation hole 16 so as to protrude from the upper surface of the housing 1. The distal end of the leg 138 has a notch 140 at the center to provide elasticity, and when inserted into the operation hole 16, it is locked inside the operation hole 16 and abuts against the movable contact plate 131. A part 139 is provided. When the test button 27 is pressed, the movable contact plate 131 comes into contact with the fixed contact shaft 132, and the zero-phase current transformer
129 generates an unbalanced current. The test circuit section 141 includes a current limiting resistor 142 for limiting a current, and a test winding 143.

The test button 27 is actually operated from the upper surface of the housing 1, and is a substantially cylindrical operating portion 13.
7 and a leg 138 extending from the lower surface of the operation unit 137. The operation unit 137 is attached to the operation hole 16 so as to protrude from the upper surface of the housing 1. The distal end of the leg 138 has a notch 140 at the center to provide elasticity, and when inserted into the operation hole 16, it is locked inside the operation hole 16 and abuts against the movable contact plate 131. A part 139 is provided. When the test button 27 is pressed, the movable contact plate 131 comes into contact with the fixed contact shaft 132, and the zero-phase current transformer
129 generates an unbalanced current. The test circuit section 141 includes a current limiting resistor 142 for limiting a current, and a test winding 143.

The electric leakage display device 28 is provided in the housing
1, and a spring for projecting the leakage display member 144 from the operation hole 15 of the housing 1.
145, first and second transmission levers 146, 147 for rotating the trip ring 50 to trip the opening / closing mechanism 44,
A tension spring 148 for pulling the second transmission lever 147 in the direction of the lower surface of the body 2 and an electromagnet device 149 for rotating the second transmission lever 147 by a current amplified by the control circuit 130 of the leakage detecting device 26. Have been. Electric leakage display member 144
Is an operation hole of the housing 1
Display section 150 protruding from 15 and operation hole 15 having a substantially prismatic shape
The leg 151 has a cut groove 152 into which one end of the spring 145 is inserted, and a locked piece 153 locked by the first transmission lever 146. Spring 145
Is formed in a coil shape, is inserted into the second fixed shaft 55, and has one end
154 is inserted into the spring shaft hole 85 of the operation handle 52, and the other end 155 is inserted into the cut groove 152 of the electric leakage display member 144, and is mounted so as to urge upward in FIG. The other end 155 has an operation handle 52 at a neutral position,
When the operating handle 52 is moved to the open position,
52 has a contact portion 156 that contacts the other end of the swing portion 83. The first transmission lever 146 has a vertical piece 157 having an opening 159, and an engaging part 160 connected to the vertical piece 157 and engaging with the engaging part 167 of the second transmission lever 147. 158. In addition, these vertical pieces 15
An insertion recess 161 into which the third fixed shaft 56 of the frame 53 is inserted is provided between the continuous arrangement of the engagement piece 158 and the engagement piece 158. The third fixed shaft 56 is inserted into the insertion recess 161, and the opening 159 is inserted into the opening 159. By inserting the projecting pieces 78 of the trip link 50, the first transmission lever 146 is held by the frame cover 89 so as to be rotatable. The second transmission lever 147 has a diagonal piece 162 having a locking portion 166 at the tip for locking the locked portion 153 of the leakage display member 144, and a first transmission lever connected to the diagonal piece 162.
Engaging piece having an engaging portion 167 that engages with the engaging portion 160
163 and the oblique piece 16
2 is provided in the direction intersecting with
A hook 164 to be hooked on the hook 148;
An electromagnet device to be described later,
And 149, a locking piece 165 for locking the movable iron core 171. The insertion recess 16 into which the first fixed shaft 54 of the frame 53 is inserted is provided between the connection between the oblique piece 162 and the engagement piece 163.
8 is provided, and the second transmission lever 147 is rotatably held by the frame cover 89 by mounting the first fixed shaft 54 in the insertion recess 168. According to the present embodiment, the transmission lever for transmitting the output of the leakage detection device to the cutoff mechanism is constituted by two members, but the transmission lever can be applied by any number of members.

The tension spring 148 is formed in a coil shape, and is hooked on the hook shaft 164 of the second transmission lever 147 and the hook shaft 37 of the body 2. The electromagnet device 149 includes a coil bobbin 169 around which a coil is wound, a fixed iron core 170, and a movable iron core 17.
1 and a yoke 172. Coil bobbin
169 is a central part 173 around which the coil is wound and this central part 17
3 and a flange portion 17 formed so as to sandwich the central portion 173.
4 from one flange 174 to the other flange.
At both ends reaching 174, through holes 175 are formed. The flanges 174 at both ends have upper pieces 182 of a yoke 172 described later.
A recess 176 is formed in which the lower piece 183 and the lower piece 183 are fitted. The coil terminals 177 at both ends of the coil bobbin 169 are connected to the control circuit unit 130 and the test circuit unit 141 of the leakage detecting device 26 via lead wires (not shown). Fixed iron core 170
The coil bobbin 1 is formed in a substantially cylindrical shape and has a cut groove 178.
69, and is held by a holding recess 185 of a yoke 172 described later. The movable core 171 has a cylindrical movable core body 179, a connecting shaft 180 connected to the movable core body 179, and an engaging member locked by a locking piece 165 of the second transmission lever 147. The movable core 179 is inserted into a through hole 175 formed in the coil bobbin 169 and is prevented from falling off by the holding recess 185 of the yoke 172. There is no. The yoke 172 has an upper piece 182 opposed thereto.
The lower piece 183 and the lower piece 183 are formed in a substantially U-shape via a connecting piece 184, and the upper piece 182 and the lower piece 183 are fitted into the concave portion 176 of the flange portion 174 of the coil bobbin 169, so that the coil bobbin is formed. Attached to 169. Also, this upper piece 182 and lower piece
183 includes the groove 178 of the fixed core 170 and the movable core body 17
9 and retaining recess 1 to keep it from falling out of through hole 175
85 are provided.

The principle of operation of the electric leakage detecting device 26, the test button 27 and the electric leakage display device 28 will be described with reference to FIGS. In the figure, 8 is an input terminal for connecting the power supply side, 216 is a neutral electric wire for connecting the ground line, 9 is an output terminal on the power supply side for connecting the load, and 10 is an output terminal of the ground line for connecting the load.

That is, when an unbalanced current flows in the electric circuit,
A secondary output is generated by detection by the zero-phase current transformer 129 and the amplifier
Amplified by 135, the switching element 136 is turned on, and the exciting core excites the movable core 171 of the electromagnet device 149 to fix the core.
When the locked portion 181 of the movable iron core 171 is sucked toward the 170 side and pushes up the locking piece 165 of the second transmission lever 147, the second transmission lever 147 rotates about the first fixed shaft 54, and the second transmission lever 147 rotates. The engagement portion 167 of the second transmission lever 147 pushes down the engagement portion 160 of the first transmission lever 146, and the first transmission lever 146 rotates about the third fixed shaft 56, and the first transmission lever 146 is rotated. The trip link 50 is connected to the third fixed shaft 56 through the projection 78 of the trip link 50 inserted into the opening 159 of the third fixed shaft 56.
Rotate around. Thereafter, the movable contact 63 is pulled off from the fixed contact 92 and the contact 60 is opened in the same manner as the trip operation of the breaking mechanism 24 described above. In addition, the rotation of the second transmission lever 147 causes the engagement portion 166 to move from the leakage indication member 14.
4 is disengaged, and together with the operation handle 52, the second
The display section 150 of the leakage display member 144 projects from the operation hole 15 of the housing 1 by the spring 145 attached via the fixed shaft 55, and the operation handle 52 is held at the neutral position. Further, when performing an earth leakage test, the test button 27 is pressed to bring the movable contact plate 131 into contact with the fixed contact shaft 132, and a signal is given to the test circuit section 141, so that the zero-phase current transformer is provided.
An unbalanced current is generated at 129, and the electromagnet device 149 operates to attract the movable iron core 171. Therefore, as described above, the movable contact 63 is tripped from the fixed contact 92 by the cutoff mechanism 24.

When the display portion 150 of the leakage display member 144 protrudes from the operation hole 15 of the housing 1 due to the electric leakage and the operation handle 52 is in the neutral position, when the operation handle 52 is displaced toward the opening position, The other end of the swing portion 83 of the operation handle 52 comes into contact with a contact portion 156 formed on the spring 145, and the other end 155 of the spring 145 moves downward in FIG. As a result, the leakage display member 144 into which the other end 155 of the spring 145 is inserted is displaced toward the inside of the housing 1, and the locked portion 153 of the leakage display member 144 locks the second transmission lever 147. The part 166 is locked. According to this embodiment, when the display unit of the leakage display member projects from the operation hole of the housing and the operation handle is in the neutral position,
By moving the operation handle toward the opening position, the electric leakage display member is locked to the second transmission lever. By moving the operation handle toward the closed position, the electric leakage display member is moved to the second transmission lever. What is locked to the transmission lever can also be applied.

The terminals are composed of input / output terminals 8 and 9 on the power supply side and output terminals 10 on the ground side. The input terminal 8 on the power supply side is a terminal screw 18 having a screwdriver operation hole 189.
6 and a screw hole 190 into which a terminal screw 186 is screwed, and a projection 19 connected to the coil 104 of the electromagnet 94 for detection.
1 and a nut 188 having a screw hole 192 into which the terminal screw 186 is screwed. The input terminal 8 on the power supply side is mounted in the terminal groove 29 of the first section 23A. . The output terminal 9 on the power supply side is a terminal screw 19 having a screwdriver operating hole 196 and a chevron-shaped contact 197.
3 and a terminal plate 194 having a screw hole 198 into which a terminal screw 193 is screwed and having a leg piece 199 connected from the fixed contact 122 via a power supply side electric wire 128, and a terminal screw 193. And a nut 195 having a screw hole 200 formed therein, and is mounted in the terminal groove 32 of the second section 23B. The input terminal 8 on the power supply side is electrically connected to the output terminal 9 on the power supply side via the contact 60 and the power supply wire 128. The output terminal 10 on the ground side has a terminal screw 201 having a driver operation hole 205 and a mountain-shaped contact 206, and a terminal screw 20.
1 has a screw hole 207 into which the
4, a terminal plate 202 having a fixed side contact portion 208 penetrating through the through hole 43, a nut 203 having a screw hole 209 into which the terminal screw 201 is screwed, and a through hole overlapping the screw hole 207 of the terminal plate 202. An insulating card 204 having a hole 210 and a cover 211 covering the power supply side output terminal 9, and the ground side output terminal 10 is located above the terminal groove 32 in which the power supply side output terminal 9 is mounted. Terminal groove 42 of terminal separator 4
Attached to.

The neutral device 212 includes a neutral movable plate 213 that contacts the fixed side contact portion 208 of the terminal plate 202;
A neutral handle 214 for pressing the neutral movable plate 213 against the fixed contact portion 208, and a neutral movable plate
A biasing spring 215 for biasing 213 in a direction away from the fixed contact portion 208, and a neutral wire 21 connected to the ground side wire.
And 6. Neutral movable plate 213
An insertion hole 217 formed of a conductive material in a rectangular shape and having one end through which a positioning protrusion 223 of a biasing spring 215 described later is inserted.
And one end is fixed to the neutral electric wire 216 by welding or the like, and is disposed between the outer wall 13 and the inner wall 40 at the contact portion 34 of the body 2 so as to face the fixed contact portion 208. The neutral movable plate 213 and the fixed contact portion 208 constitute a neutral contact 218. The neutral handle 201 is made of an insulating material such as a synthetic resin and has a substantially elliptical shape when viewed from the side, and has an annular portion 219 that comes into contact with the neutral movable plate 213 by rotating, and an uneven portion at a fixed position (not shown) of the body 2. A rotating support shaft 220 which is fitted and becomes the center of rotation;
An operating portion 221 extending from the outside of the housing 1 by extending an upper end surface of the inner wall 40, and a projection 222 for pressing the neutral movable plate 213 against the fixed contact portion 208,
Operating part in window hole 12 for neutral handle in housing 1
221 is disposed inside the housing 1 so as to protrude. The biasing spring 215 is formed in a coil shape by a member having elasticity, and biases the neutral movable plate 213 in a direction away from the fixed contact portion 208 by being mounted in the mounting recess 33b of the support portion 33. . The positioning projection 223 of the biasing spring 215 is inserted into the insertion hole of the neutral movable plate 213.
The neutral movable plate 213 is positioned by inserting the neutral movable plate 213 into the insertion recess 34a of the penetrator 2 at 217.
The urging spring 215 has a receiving end 224 at its leading end that abuts against the neutral movable plate 213 to increase the area for urging the neutral movable plate 213. According to the present embodiment, the neutral contact is opened and closed by rotating the neutral handle. However, the present invention can be applied as long as the neutral wire and the output terminal on the ground side are connected by an opening and closing operation.

As shown in FIG. 21, the neutral electric wire 216 includes an output terminal side electric wire 216a fixed to one end of the neutral movable plate 213 and a ground side electric wire 216b led out to the ground side line.
The output terminal side electric wire 216a and the ground side electric wire 216b are connected by a connecting member 226. As the output terminal side electric wire 216a, a highly flexible electric wire such as a stranded wire is used, and one end is fixed to one end of the neutral movable plate 213 and connected to the connector 226 via the zero-phase current transformer 129. Ground side wire 21
6b has one end connected to the connection member 226 and the other end drawn out from the outlet hole 20 of the housing 1 and connected to the ground side line. The connection member 226 is composed of two members. One member 226a is fixed to the output terminal side electric wire 216a, and the other member 226b is fixed to the ground side electric wire 216b by crimping. One member 226a is provided with a plate-like protrusion 226c, and the other member 226b is provided with a curved side wall-like holding piece 226d.
Into the holding piece 226d and into the through hole 226e of the protruding piece 226c.
By fitting the protrusion 226f of 226d, the output terminal side electric wire 216a and the ground side electric wire 216b are connected as if a plug is inserted into the outlet. The protruding piece 226c and the holding piece 226d of the connecting member 226 are disposed between the two locking portions 38 of the separator 3. In other words, the output terminal side electric wire 21
If you try to pull out 6a or the ground side wire 216b,
Since the holding piece 226d is locked by the locking portion 38, it does not come off. In addition, since a highly flexible electric wire is used for the output terminal side electric wire, the work of drawing the inside of the housing becomes easy. According to the present embodiment, the connecting member is composed of the holding piece and the protruding piece, but any shape or configuration can be used as long as it can be locked to the locking portion of the separator. Applicable. In addition, when a small flexible electric wire is used as the ground-side electric wire, it is easy to make a habit when wiring inside the distribution board.

Next, a method for opening and closing the neutral device 212 will be described with reference to FIG. That is, the broken line in the drawing shows a state in which the neutral handle 214 is depressed and the neutral movable plate 213 is opened. In this state, the neutral movable plate 213 is in contact with the contact portion 34 of the container 2 by the urging of the urging spring 215. In this state, when the operating part 221 of the neutral handle 214 is rotated so as to rise, the neutral handle 214 is rotated.
The tip of the projection 222 formed on 214 is a neutral movable plate
The neutral movable plate 213 is pressed so as to come into contact with the fixed-side contact portion 208 by abutting the 213. And the projection 222
When the neutral movable plate 213 is pressed beyond the center of the end of the projection, the tip of the projection 222 is pressed obliquely upward in FIG. 38 by the pressing force of the biasing spring 215, and the neutral handle 214 is moved to the neutral movable plate 213 on the fixed side. Contact 208
Is fixed in contact with.

According to the present embodiment, the circuit breaker is provided with the leakage detection device and the leakage display device, but can be applied to a circuit breaker without the leakage detection device, the leakage display device, and the like.

Further, according to the present embodiment, the locking portion is provided on the separator, but the locking portion may be provided on the housing.

[0057]

According to the circuit breaker of the present invention, the lead-out holes for leading the neutral wire out of the housing are provided at both ends of the housing, so that the grounding side line of the electric circuit is disposed near one end of the housing. However, it is possible to derive the neutral electric wire from the outlet hole closer to the ground side line,
Wiring work with the ground side line of the electric circuit becomes easy.

In the circuit breaker according to the present invention, the neutral electric wire is separated into an output terminal side electric wire and a ground side electric wire, and the output terminal side electric wire is made highly flexible, and is connected in the housing. Therefore, in addition to the effect of the first aspect, the electric wire on the output terminal side on the ground side can be freely bent and housed so as to fit in the space in the housing, which facilitates assembly.

In the circuit breaker according to the third aspect, the output terminal side electric wire and the ground side electric wire are connected via the connecting member. It can be connected to an electric wire, and the connection work becomes easy.

According to a fourth aspect of the present invention, the circuit breaker has a vertically divided housing, an isolator for isolating the arc extinguishing device provided in the interior of the circuit breaker, and an output terminal on a side isolated by the isolator. Since the side electric wire and the ground side electric wire are connected, in addition to the effect of claim 2 or 3, the influence of the arc at the time of contact opening / closing can be reduced, and the connection place between the output terminal side electric wire and the ground side electric wire is insulated. It has good properties.

In the circuit breaker according to the fifth aspect, the locking portion for locking the connection member is provided in the housing or the separator, so that the circuit breaker in addition to the effects of the third or fourth aspect is provided, and the output terminal side electric wire and The connection between the output terminal side wire and the ground side wire can be hardly removed while the tension at the connection portion with the ground side wire can be removed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a partial longitudinal sectional view of FIG.

FIG. 3 is a partial longitudinal sectional view of FIG.

FIG. 4 is a partial longitudinal sectional view of FIG.

FIG. 5 is a perspective view showing a state where a cover is attached to FIG. 1;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a front view of FIG. 5;

FIG. 8 is a side view of FIG. 5 viewed from the input terminal side on the power supply side.

FIG. 9 is a side view of FIG. 5 viewed from the output terminal side on the power supply side.

FIG. 10 is an exploded perspective view of FIG.

FIG. 11 is a partially exploded perspective view of FIG.

FIG. 12 is a partially exploded perspective view of FIG.

FIG. 13 is a partially exploded perspective view of FIG.

FIG. 14 is a partially exploded perspective view of FIG.

FIG. 15 is a partially exploded perspective view of FIG.

FIG. 16 is a partially exploded perspective view of FIG.

FIG. 17 is an exploded perspective view of FIG. 10 further exploded.

FIG. 18 is a partially exploded perspective view of FIG.

FIG. 19 is a partially exploded perspective view of FIG. 17;

FIG. 20 is a partially exploded perspective view of FIG. 17;

FIG. 21 is a partially exploded perspective view of FIG.

FIG. 22 is a partially exploded perspective view of FIG.

FIG. 23 is a partially exploded perspective view of FIG.

FIG. 24 is a partial exploded perspective view of FIG.

FIG. 25 is a longitudinal sectional view showing a state where the operation handle of FIG. 1 is turned on.

FIG. 26 is a partial longitudinal sectional view of FIG. 25.

FIG. 27 is a partial longitudinal sectional view of FIG. 25.

FIG. 28 is a partial longitudinal sectional view of FIG.

FIG. 29 is a longitudinal sectional view showing a tripped state of the one shown in FIG. 1;

FIG. 30 is a partial longitudinal sectional view of FIG. 29.

FIG. 31 is a partial longitudinal sectional view of FIG. 29;

FIG. 32 is a partial longitudinal sectional view of FIG. 29.

FIG. 33 is a circuit diagram of the leakage detecting mechanism of FIG. 1;

FIG. 34 is a vertical cross-sectional view for explaining a trip operation of FIG. 1 due to electric leakage.

FIG. 35 is a partial longitudinal sectional view of the one shown in FIG. 34;

FIG. 36 is a partial longitudinal sectional view of the one shown in FIG. 34;

FIG. 37 is a partial longitudinal sectional view of the one shown in FIG. 34;

FIG. 38 is a longitudinal sectional view showing the neutral device of FIG. 1;

FIG. 39 is a front view showing a state where a conventional circuit breaker is incorporated in a distribution board.

[Explanation of symbols]

 1 Housing 8 Input terminal on the power supply side 9 Output terminal on the power supply side 10 Output terminal on the ground side 19 Outlet hole 20 Outlet hole 24 Shutoff mechanism 25 Arc extinguisher 44 Opening / closing mechanism 45 Abnormal current detection device 60 Contact 216 Neutral electric wire

Claims (5)

(57) [Claims] 1. A power supply side line of an electric circuit and a power supply side input / output terminal connected to a load are provided at both ends, and a ground side output terminal connected to a load is provided at one of both ends. A housing containing a part of a neutral wire that connects the terminal and the ground side wire, an opening / closing mechanism that opens and closes a contact between the input and output terminals on the power supply side of the circuit, and an abnormal current detection that detects an abnormal current flowing in the circuit Equipment,
A circuit breaker comprising: a breaking mechanism for forcibly opening a contact in response to an abnormal current detection device; and an arc extinguishing device for extinguishing an arc generated by opening and closing the contact. A circuit breaker characterized in that outlet holes are provided at both ends of a housing. 2. The method according to claim 1, wherein the neutral electric wire is separated into an output terminal side electric wire and a ground side electric wire, and the output terminal side electric wire has high flexibility, and the two electric wires are connected in a housing. The circuit breaker according to claim 1. 3. The output terminal side electric wire and the ground side electric wire,
3. The circuit breaker according to claim 2, wherein the circuit breaker is connected via a connecting member. 4. An apparatus according to claim 1, wherein said housing is a vertically divided body, and an isolator is provided for isolating the arc extinguishing device disposed in the housing. The output terminal side electric wire and the ground side electric wire are separated by the isolator. The circuit breaker according to claim 2 or 3, wherein the circuit breaker is connected. 5. The circuit breaker according to claim 3, wherein a locking portion for locking the connection member is provided on the housing or the separator.