JPH10289643A - Earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bipolar earth leakage breaker having the same external dimension as the constitution of a unipolar breaker by uniting an over current tripping device, a leakage tripping mechanism, an opening/closing mechanism part, and mechanisms such as a trip bar part into a unit and fitting it into a synthetic resin casing. SOLUTION: A part of an over current tripping device 60 and a part of a leakage tripping device 84 are a united mechanism and fitted into an insulating casing 43. This constitution dispense with the fastening of the parts, connection of the conductive parts, etc., after being fitted into the insulating casing 43. A part of an opening/closing mechanism 69 and a part of a trip bar 98 are also a united mechanism and fitted into the insulating casing 43. After their fitted into the insulating casing 43, no fastening of the parts is required. An arc extinction device 52, a guide plate 95, etc., besides the united mechanism may be fitted into the insulating casing 43 or each mechanism so as to dispense with the fastening of the parts, connection of the conductive parts, etc. The insulating casing 43 is formed into the same dimension as a unipolar coupled type wiring breaker for an electric lamp distribution board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized earth leakage circuit breaker having an appearance such as a common circuit breaker for a light distribution board.

[0002]

2. Description of the Related Art As a circuit breaker having an external appearance such as a common circuit breaker for a light distribution board according to Appendix 5 of Japanese Industrial Standard JIS-C8370, as shown in FIGS. There are circuit breakers and breakers in the configuration. That is, FIG.
1 is a front sectional view showing a conventional circuit breaker similar to that shown in, for example, JP-A-1-56493, and shows a closed state. FIG. 23 is a front sectional view showing a state where the circuit breaker of FIG. 22 is in an open circuit state, FIG. 24 is a front sectional view showing a state at the moment when the circuit breaker of FIG. 22 trips, and FIG. FIG. 4 is an enlarged front view showing a connection state between the power supply terminal and the power supply terminal.

In FIG. 22, reference numeral 1 denotes a base, which is formed of a synthetic resin. 2 is a shaft 1 protruding from the base 1
The handle is rotatably supported about a. Reference numeral 3 denotes a torsion spring mounted on the shaft 1a, one end of which is engaged with the base 1 and the other end thereof is engaged with the handle 2, and biases the handle 2 counterclockwise. Reference numeral 4 denotes a connection pin formed in a U-shape, and one leg is rotatably inserted into a through hole 2b provided in a projection 2a protruding from the handle 2.

Reference numeral 5 denotes a movable contact, which is rotatably supported by a shaft 6 implanted on the base 1 and has a pair of first and second latch surfaces 5a and 5a at one end of rotation. 5b, and the movable contact 5c is fixed to the other end. Reference numeral 7 denotes a locking lever having a locking portion 7a, which is rotatably supported by the shaft 6 similarly to the movable contact 5 and biases the movable contact 5 by a twist spring 8 wound around the shaft 6. It is always biased in the opposite direction. Reference numeral 9 denotes a roller, which is rotatably inserted into the other leg of the connecting pin 4 and is normally held between the first latch surface 5a and the second latch surface 5b and the locking portion 7a.

[0005] Reference numeral 12 denotes a first spring hanging shaft mounted on the movable contact 5, 13 denotes a second spring hanging shaft planted on the base 1, 14 denotes the first spring hanging shaft 12 and the second spring hanging shaft 1.
3 is a tension spring that is stretched between the first and third springs. Reference numeral 15 denotes a fixed contact fitted to the base 1, and a fixed contact 15a is fixed to face the movable contact 5c. Reference numeral 16 denotes an electromagnetic trip device, 17 denotes a yoke fitted to the base 1 to form a magnetic path of the electromagnetic trip device 16, and 18 denotes an electromagnetic coil. One end of the electromagnetic coil 18 is a fixed contact 1
5, the other end is electrically connected to the load terminal 19.

Reference numeral 20 denotes a wire holder, 21 denotes a terminal screw,
An external conductor (not shown) is connected to the load terminal 19. Reference numeral 22 denotes a plunger which is attracted leftward in the drawing against the urging force of the pressing spring 23 when the electromagnetic coil 18 is excited, and 24 is a rod which is driven leftward when the plunger 22 is attracted. is there. Reference numeral 29 denotes a flexible conductor, one end of which is electrically connected to the movable contact 5, and the other end of which is electrically connected to the bimetal 30. Reference numeral 31 denotes an insulating tube mounted on the bimetal 30. Reference numeral 32 denotes a power supply side terminal formed of copper or a copper alloy material.
As shown in FIG. 3, one end is electrically connected to the bimetal 30 via an arc runner 33 formed of a magnetic material such as an iron plate, and the other end is connected to an external conductor (not shown) by a wire holder 34 and a terminal screw 35. I do. Numeral 36 denotes an adjusting screw which is screwed into a female screw portion formed on the vertical terminal piece 32a of the power supply side terminal 32, acts on the welded portion of the arc runner 33 with the bimetal 30, and locks with the tip portion 30a of the bimetal 30. The gap between the one ends 7b of the lever 7 is adjusted. An arc extinguishing device 37 extinguishes an arc generated between the contacts 5c and 15a.

In such a conventional circuit breaker,
In each of the closed state of the circuit breaker shown in FIG. 22 and the open state of the circuit breaker shown in FIG. 23, the roller 9 is connected to the first latch surface 5a and the second latch surface 5b of the movable contact 5. And the connecting pin 4 is locked between the locking lever 7 and the locking portion 7 a of the locking lever 7. When the handle 2 is turned ON clockwise from the open state of the circuit breaker shown in FIG. 23, the toggle link mechanism formed by the projection 2a of the handle 2 and the connecting pin 4 extends beyond the dead point,
The movable contact 5 rotates counterclockwise about the shaft 6, and the movable contact 5c contacts the fixed contact 15a, so that the closed state shown in FIG. 22 is established.

Next, when the handle 2 is turned OFF in the counterclockwise direction from the closed state of the circuit breaker shown in FIG. 22, a toggle link mechanism formed by the projection 2a of the handle 2 and the connecting pin 4 causes a dead point. This causes the movable contact 5 to rotate in the clockwise direction about the shaft 6, the movable contact 5c is separated from the fixed contact 15a, and the open state shown in FIG. 23 is established.

Next, in the closed state of the circuit breaker shown in FIG. 22, when an overcurrent flows in the electric circuit, the free end 30a of the bimetal 30 is bent and the one end 7 of the locking lever 7 is bent.
b, or the plunger 24 is actuated to push the other end 7c of the locking lever 7 with the rod 24, thereby rotating the locking lever 7 clockwise about the shaft 6 so that the roller 9 is rotated. The pinching between the first latch surface 5a and the second latch surface 5b of the movable contact 5 and the locking portion 7a of the locking lever 7 is released. When the roller 9 is released, the connection pin 4 is unlocked, the movable contact 5 rotates clockwise about the shaft 6 by the urging force of the pulling spring 14, and the movable contact 5c is separated from the fixed contact 15a. The trip state shown in FIG.

Thereafter, the handle 2 rotates counterclockwise by the urging force of the twist spring 3, and the roller 9 moves the first latch surface 5a and the second latch surface 5b and the locking portion 7a of the locking lever 7. And the roller 9 moves to the first latch surface 5
23, the connecting pin 4 is locked by being sandwiched between the second latch surface 5b and the locking portion 7a, the handle 2 moves to a position similar to the open state shown in FIG. 23, and is automatically reset. Things.

[0011]

In the conventional circuit breaker as described above, since the electromagnetic trip device 16 requires a large space, a two-pole circuit having the same external dimensions as the one-pole circuit breaker is required. It was difficult to make a circuit breaker. That is, for example, in the above-mentioned circuit breaker for collective wiring for a light distribution board, it is specified that the width dimension for a one-pole product is 25 mm and the width dimension for a two-pole product is 50 mm. However, in recent years, there has been a demand for a circuit breaker having two poles with a width of one pole. In such a case, it is difficult to form a two-pole circuit breaker with a width of one pole product in the above-described conventional configuration. In particular, in the case of a configuration having an earth leakage trip function, that is, in the case of an earth leakage circuit breaker, it is necessary to add a zero-phase current transformer, a control circuit, and the like. It was extremely difficult.

When a large current such as a short-circuit current flows, the current is supplied to the power supply terminal 3 as shown by an arrow A in FIG.
2 → Adjustment screw 36 → Arc runner 33 and bimetal 30
However, since the contact resistance between the tip of the adjusting screw 36 and the arc runner 33 is high, the heat generated at the contact portion gradually increases, which may cause erosion. . For this reason, there is a problem in that after the short-circuit current is cut off, the fluctuation of the tripping time is increased due to melting. Also, since the adjusting screw 36 is screwed to the small effective diameter female screw portion of the power supply side terminal 32 formed of a thin copper or copper alloy material, the strength of the screw portion is weak and the screw portion is easily broken. There was a problem. Further, since the flexible conductor 29 is routed from the bimetal 30 to the movable contact 5 so as to approach the current-carrying portion of the bimetal 30, the flexible conductor 29 may come into contact with the current-carrying portion of the bimetal 30. is there. By this contact, bimetal 30
Change the resistance of the trip time and the trip time becomes unstable.
The insulating tube 31 had to be mounted on the bimetal 30.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide, for example, the same external dimensions as those of a one-pole product in a collective circuit breaker for a light distribution board. To obtain a two-pole earth leakage breaker.

A second object of the present invention is to provide an earth leakage circuit breaker having a small trip time limit after tripping a short circuit current.

Further, a third object is to obtain an earth leakage breaker in which the strength of the adjusting screw portion is strong and hard to be damaged.

A fourth object of the present invention is to provide an earth leakage breaker in which a flexible conductor hardly comes into contact with a current-carrying portion of a bimetal.

[0017]

A circuit breaker according to the present invention generates a power supply terminal, a bimetal having one end joined to a terminal portion of the power supply terminal, and an electromagnetic force according to a current flowing through the bimetal. Fixed iron piece, and a movable contact connected to the other end of the bimetal via a flexible conductor, and a unitized overcurrent release mechanism, a load-side terminal, and a load-side terminal. A fixed contact that is connected through the main conductor so as to come into contact with and separate from the movable contact; a zero-phase current transformer provided in the main conductor; A control circuit unit that generates a disconnection signal, and an electromagnet unit that operates in response to a leakage release signal, and are unitized as a leakage removal mechanism unit, an overcurrent release mechanism unit, and a leakage removal mechanism unit. Is provided.

A power supply terminal, a bimetal having one end joined to a terminal portion of the power supply terminal, a fixed iron piece for generating an electromagnetic force according to a current flowing through the bimetal, and a flexible conductor at the other end of the bimetal. And a pair of movable contacts connected via a pair, and a unitized overcurrent tripping mechanism, a pair of load terminals, and the movable terminals connected to the load terminals via a main conductor. A pair of fixed contacts that come into contact with and separate from the contacts, a zero-phase current transformer provided in the main conductor, and control for detecting the output of the zero-phase current transformer and generating a signal for tripping the earth leakage A circuit unit, an electromagnet unit that operates in accordance with a signal of the earth leakage trip, and an earth leakage trip indicator that responds to the operation of the electromagnet unit, and a unitized earth leakage trip mechanism unit and an overcurrent trip mechanism unit And the leakage trip mechanism Those having a housing for.

Also, a handle for manual operation, a link mechanism interlocked with the operation of the handle for manual operation, a crossbar connected to the link mechanism and formed so as to fit the movable contact, and a pair of fixed iron pieces Among them, the movable iron piece attracted by the electromagnetic force of the fixed iron piece of one pole, the locking lever driven by the movable iron piece or the bimetal on one pole side to cause the trip operation, and the signal of the earth leakage trip It has a trip lever that causes a tripping operation when the actuating electromagnet part is activated, a frame for assembling these parts, and has a unitized opening and closing mechanism, and the opening and closing mechanism is mounted on the housing. It is stored.
In addition, a trip bar formed to be driven by the bimetal of the other pole of the pair of bimetals, and a movable iron piece that is attracted to the trip bar by the electromagnetic force of the fixed iron piece of the other pole are provided on the trip bar. When the movable iron piece is sucked by the driving or fixed iron piece, a tripping operation is formed via the locking lever, and the trip bar part is provided with a trip bar part. It is stored in.

Further, the overcurrent tripping device is characterized in that an adjusting screw is screwed to a terminal portion near the bimetal is fixed, and a drooping terminal portion formed by cutting and bending the terminal portion to which the bimetal is fixed is connected to the adjusting screw. The terminal portion is deformed by pushing in or returning the terminal portion to the original position, thereby adjusting the position of the free end of the bimetal. Also,
An adjusting screw is screwed to a fixed iron piece provided at a terminal portion near the bimetal is fixed. In addition, the flexible conductor that electrically connects the bimetal and the movable contact is disposed so as not to face a current-carrying portion of the bimetal.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a front cross-sectional view showing the inside of a ground fault circuit breaker according to an embodiment of the present invention with a part cut away, showing a closed state of the ground fault circuit breaker. FIG. 2 is a front sectional view showing the circuit breaker of FIG. 1 in an open circuit state, FIG. 3 is a front sectional view showing the circuit breaker of FIG. 1 in a trip state, and FIG. 4 is a circuit breaker of FIG. FIG. 5 is a rear cross-sectional view showing the circuit breaker in a closed state, FIG. 5 is a rear cross-sectional view showing the circuit breaker of FIG. 1 in an open state, and FIG. 6 is a view showing the circuit breaker of FIG. 1 in a trip state. FIG. FIG. 7 is an enlarged front sectional view showing the overcurrent trip device of the present invention. FIG. 8 is an enlarged plan view of the overcurrent trip device of FIG. FIG. 9 is an enlarged front sectional view showing the overcurrent tripping device of the present invention. The external dimensions of the earth leakage breaker in this embodiment are based on Japanese Industrial Standard JIS-C83.
It is sized to meet the dimensions for a one-pole product specified in the common-type circuit breaker for light distribution board according to Annex 5 of Appendix 70.

1 to 4, reference numeral 40 denotes a first cover, 41 denotes a base, and 42 denotes a second cover (shown in FIG. 5).
And both are formed of a synthetic resin. Reference numeral 43 denotes an insulating casing including the first cover 40, the base 41, and the second cover 42. The insulating casing 43 is formed in a size of one pole of the common type circuit breaker for a light distribution panel as described above. I have. 4
Reference numeral 4 denotes a fixed contact, reference numeral 45 denotes a fixed contact fixed to the fixed contact 44, and reference numeral 46 denotes a movable contact having a movable contact 47 which faces and separates from the fixed contact 45.

Reference numeral 48 denotes a crossbar formed of a synthetic resin in a shape as shown in FIG.
One end of each movable contact 46 provided in parallel with both poles is fitted and held. 16A is a front view, FIG. 16B is a side view, and FIG.
Is a rear view. Reference numeral 49 denotes a contact spring, which is interposed between the movable contact 46 and the crossbar 48 and constantly urges the movable contact 47 in a direction in which the movable contact 47 contacts the fixed contact 45. Reference numeral 50 denotes a crossbar spring that urges the crossbar 48 clockwise.
Reference numeral 51 denotes a flexible conductor, one end of which is connected to the movable contact 46, and the other end of which is connected to a free end 62a of a bimetal 62 of an overcurrent trip device 60 described later. An arc extinguishing device 52 extinguishes an arc generated between the two contacts 45 and 47.

Reference numeral 60 denotes an overcurrent trip device, and its detailed structure will be described with reference to FIGS. Reference numeral 61 denotes a power supply side terminal formed by bending a conductive material such as copper or a copper alloy, and includes a horizontal terminal portion 61a and a vertical terminal portion 61b.
And an inclined terminal portion 61c, and a hanging terminal portion 61d cut and bent from the base of the inclined terminal portion 61c, and is fitted into the groove 41a of the base 41. Reference numeral 62 denotes a flat bimetal, one end of which is fixed to the inclined terminal portion 61 c of the power supply terminal 61. 63 is a fixed iron piece, which is formed by bending a magnetic material such as an iron plate into a U-shape,
A board portion 63a having a female screw portion is provided between the vertical terminal portion 61b of the power supply terminal 61 and the hanging terminal portion 61d.

Reference numeral 64 denotes a movable iron piece disposed opposite to the fixed iron piece 63 at one of the poles (the pole on the side shown in FIGS. 1 to 3), and is formed of a magnetic material such as an iron plate, and has a central portion. It is rotatably supported by a shaft 65 held by a frame 70 described later. Reference numeral 66 denotes an adjustment screw screwed to the fixed iron piece 63. The adjustment screw 66 is screwed from the state shown in FIG.
By pushing the hanging terminal portion 61d of the power supply side terminal 61 into the position shown in FIG. 9 or returning it to the original position, this acts on the vertical terminal portion 61b and the width of the hanging terminal portion 61d of the inclined terminal portion 61c. Root portion 61e of width L2 narrower than L1
(Shown in FIG. 8) to thereby deform the bimetal 6
9 is deformed as shown in FIG. 9 so that the free end 62a of the bimetal 62 and the first engagement piece 72 of the locking lever 72 described later.
Adjust the gap G with a.

Reference numeral 69 denotes an opening / closing mechanism. Reference numeral 70 denotes a frame for supporting the opening / closing mechanism 69, which is partially cut away. The frame 70 is supported by a shaft 65 and a shaft 92 implanted between the base 41 and the first cover 40. I have. 72
Is a locking lever formed in a shape as shown in FIG. 17, one end of which is a first engaging piece 72a with which the free end 62a of the bimetal 62 engages when bent in the direction of the arrow, and the other end is described later. L-shaped second engagement piece 72 engaged with roller 79
and a third engagement piece 72c with which a later-described trip lever 91 is engaged, and is rotatably supported on the shaft 65.

Reference numeral 73 denotes an arm formed in a shape as shown in FIG. 18, which presses a guide groove 73a for guiding a roller pin 75 pivotally supported by a handle arm 74, which will be described later, and a projection 48a of the cross bar 48. A pressing portion 73b is formed, and is rotatably supported on the shaft 65. Reference numeral 74 denotes a handle arm, and a roller pin 75 pivotally supported at one end.
Through the guide groove 73a. Reference numeral 76 denotes a handle formed of a synthetic resin. The first protrusion 76a protrudes from the outer peripheral surface, and the second protrusion 76 protrudes from the end surface.
b, and a third protrusion 76c protruding from the end face of the back surface, and is disposed inside the insulating casing 43 and is turned ON and O from the outside.
The FF operation is possible, and the FF operation is interlocked with the handle arm 74 via a shaft 77 inserted into the first protrusion 76a.
Reference numeral 78 denotes a handle shaft inserted into the frame 70, which rotatably supports the handle 76. 79 is a roller, and a roller pin 75 mounted on the handle arm 74 is provided.
Is rotatably inserted in

Numeral 80 denotes a fixed contact 44 to a load terminal 81.
A conductor 82 that electrically connects between them is a zero-phase current transformer through which the conductor 80 penetrates and detects an unbalanced current in the electric circuit. Numeral 83 denotes a control circuit for controlling the zero-phase current detected by the zero-phase current transformer 82.
It is composed of electronic components such as C. Reference numeral 84 denotes an earth leakage trip device, which includes an electromagnet portion 87, a plunger 88,
An earth leakage trip indicator or an earth leakage trip display button 89 that projects from the upper end surface 41a of the base 41 during an earth leakage operation to indicate that the earth leakage operation has occurred, a display button spring 90 that urges the earth leakage trip display button 89 in a projecting direction, and the like. It consists of.

Reference numeral 91 denotes a trip lever formed in a shape as shown in FIG. 19, which includes a plunger engaging portion 91a abutting on the tip end of the plunger 88, and a latch portion 89a formed at one end of the earth leakage trip display button 89. And a lever engaging portion 91c that engages with the third engaging piece 72c of the locking lever 72, and is rotatably supported by a shaft 92. Reference numeral 93 denotes a trip lever spring mounted on the shaft 92, which constantly biases the trip lever 91 counterclockwise.

The base 41 of the circuit breaker shown in FIGS.
On the back side of the device, a terminal of the other pole adjacent to the opening / closing mechanism section 69 on the front side, a conducting member including an overcurrent trip device and the like, and a display auxiliary member are configured. In the figure, 44-
52, 60 to 66, 80, and 81 are the same as those shown in FIG. 1 described above, and description thereof will be omitted.

Reference numeral 95 denotes a guide plate supported by the handle 76, and reference numeral 96 denotes a handle which is engaged between the guide plate 95 and the handle 76 and urges the guide plate 95 and the handle 76 so as to always maintain a predetermined relationship. Spring, 9
Reference numeral 7 denotes a U-shaped connecting pin for rotatably connecting the guide plate 95 and the crossbar 48. Guide plate 9
5, the handle spring 96, and the connecting pin 97 are insulated from the front opening / closing mechanism 69 by the pole spacing wall 41 b of the base 41.

The guide plate 95, the handle spring 96, and the connecting pin 97 are directly engaged with one end of an insulating member such as the handle 76 and the crossbar 48. Reference numeral 98 denotes a trip bar as an interlocking member, and the first projection 9 on one end of which the free end 62a of the bimetal 62 engages when bent.
8a and a second projection 98b substantially at an intermediate portion, which projects to the front portion shown in FIG. 1 and engages with the locking lever 72, are supported by the shaft 65.

In the above configuration, the portion of the overcurrent trip device 60 is fitted into the housing by a unitized mechanism as shown in FIG. That is, the overcurrent trip device 60 generates the electromagnetic force in accordance with the power supply terminal 61, the bimetal 62 having one end connected to the inclined terminal portion 61 c of the power supply terminal 61, and the current flowing through the bimetal 62. The fixed iron piece 63 and the movable contact 46 connected to the free end 62a of the bimetal 62 via the flexible conductor 51 are provided in a pair. After being fitted into the housing, the parts are tightened or The connection of energized parts is unnecessary.

As shown in FIG. 13, the portion of the earth leakage trip device 84 is fitted into the housing by a unitized mechanism. That is, the pair of load-side terminals 81 and the movable contactor 46 connected to the load-side terminals 81 via the main conductor 80.
And a pair of fixed contacts 44 that are brought into contact with and separated from the main conductor 80, a zero-phase current transformer 82 provided on the main conductor 80, and an output of the zero-phase current transformer 82 is detected to detect a signal for tripping the earth leakage. It is provided with a control circuit section 83 to be generated, an electromagnet section 87 operated by the signal of the earth leakage trip, and an earth leakage trip display button 89 responding to the operation of the electromagnet section 87. This eliminates the need for tightening parts or connecting current-carrying parts.

Further, the portion of the opening / closing mechanism 69 is the same as that shown in FIG.
As shown in (1), it is fitted into the housing by a unitized mechanism. That is, a handle 76 for manual operation, a link mechanism such as a handle arm 74 interlocked with the operation of the handle 76 for manual operation, and a cross connected to the link mechanism and formed so as to fit the movable contact 46 therein. Bar 4
8, the movable iron piece 64 attracted by the electromagnetic force of the fixed iron piece 63 of one of the pair of fixed iron pieces 63, and the movable iron piece 64 or the bimetal 62 on the one pole side to be driven off Locking lever 7 that causes movement
2, a trip lever 91 for causing the earth leakage trip display button 89 to react when the electromagnet part 87 is actuated and causing a tripping operation, and a frame 70 for assembling these parts. After the fitting, tightening of parts is not required.

Further, the portion of the trip bar 98 is
As shown in FIG. 15, it is fitted into the housing by a unitized mechanism. That is, of the pair of bimetals 62, a trip bar 98 formed to be driven by the other bimetal 62 and a movable iron piece attracted to the trip bar 98 by the electromagnetic force of the fixed iron piece 63 of the other pole. 67
After being fitted into the housing, tightening of parts and the like becomes unnecessary.

The arc extinguishing device 52 other than the unitized mechanism, the guide plate 95, or the connecting pin 97
These components are simply inserted into the housing and each mechanism, and the tightening of components or the connection of a current-carrying portion is not required.

Next, the operation will be described. When the circuit breaker shown in FIG. 1 is in a closed state, that is, in a state shown in detail in FIG. 20, the handle 76 is turned clockwise.
When operated, the toggle link mechanism formed by the projection 76a of the handle 76, the handle arm 74 and the shaft 77 bends beyond the dead point, and the crossbar 48 is rotated about the shaft 71 by the biasing force of the crossbar spring 50. 21, the movable contact 47 of the movable contact 46 held by the cross bar 48 is separated from the fixed contact 45 as shown in FIG. It stops at the position where the end face 70a and the end face 48b of the crossbar 48 are in contact, and the separating operation is completed.

Next, in the closed state shown in FIG. 1, when an overcurrent flows in the electric circuit, the free end 62a of the bimetal 62 bends in the direction of the arrow and presses the first engagement piece 72a of the locking lever 72. Or, when the movable iron piece 64 is attracted to the fixed iron piece 63, the lower end 64 a of the movable iron piece 64 is moved to the first engagement piece 72 a via the second protrusion 98 b of the trip bar 98.
Press. By this pressing, the locking lever 72 moves the shaft 65
, And the engagement between the roller 79 and the second engagement piece 72b of the locking lever 72 is released. That is, the engagement of the handle arm 74 is released.

Next, when the engagement of the handle arm 74 is released, as shown in FIG. 3, the crossbar 48 rotates clockwise about the shaft 71 by the urging force of the crossbar spring 50, and is movable. The contact 47 is separated from the fixed contact 45,
It further rotates and stops at the position where the end face 70a of the frame 70 and the end face 48b of the crossbar 48 abut on each other, completing the separating operation.

At this time, the handle 76 is urged by the handle spring 96 so as to be always held in the same relational position as the guide plate 95 at the other pole adjacent to that shown in FIG. Therefore, the handle 76 is connected to the crossbar 48.
In conjunction with the movement of the guide plate 95 of the link mechanism including the connecting pin 97 and the guide plate 95,
It turns to the OFF position direction by the urging force of the handle spring 96, stops at the trip position which is an intermediate position between ON and OFF as shown in FIGS. 6 and 3, and confirms that the circuit breaker is in the trip state. indicate.

Next, the operation of the earth leakage trip device 84 will be described. When an unbalanced current flows in the electric circuit while the circuit breaker shown in FIG. 1 is in a closed state, the zero-phase current transformer 82 detects the zero-phase current and sends a current signal to a control circuit unit 83. When the value of the zero-phase current exceeds a predetermined value, the unit 83 excites the electromagnet unit 87 in the earth leakage trip device 84.

When the plunger 88 is attracted in the direction of the arrow by the excitation of the electromagnet portion 87, the trip lever 91 is rotated clockwise about the shaft 92 at the tip of the plunger 88, and at the same time, the lever of the trip lever 91 is turned. Engaging part 9
1c, the third engaging piece 72c of the locking lever 72 is pressed, and the roller 79 and the second engaging piece 72b of the locking lever 72 are pressed.
Is released. That is, the opening and closing mechanism 69 is tripped in the same manner as shown in FIG.

At the same time, the earth leakage trip display button 8
9 by releasing the latch mechanism constituted by the latch portion 89a formed at one end of the latch lever 9 and the latch engaging portion 91b of the trip lever 91 as shown by a dashed line in FIG. As indicated by the one-dot chain line, the display button spring 90 protrudes from the upper end surface 41a of the base 41 to indicate that a leakage operation has occurred.

Next, when the handle 76 is rotated clockwise (in FIG. 1) and reset operation is performed after the cause of the electric leakage accident has been eliminated, the reset operation of the opening / closing mechanism 69 and the second operation of the handle 76 are performed. The projection 76b is the display button 8
9 is pressed. By this pressing, the earth leakage trip display button 89 is lowered against the urging force of the display button spring 90, and the latch engagement portion 9 of the trip lever 91 is moved.
1b and the latch portion 89a of the earth leakage trip display button 89 are again engaged by the biasing force of the trip lever spring 93 and the display button spring 90, and the reset operation is completed. Therefore, the earth leakage breaker is in the open circuit state shown in FIG.

Embodiment 2 The above earth leakage breaker is 2 poles 2
Although the element is described, the two-pole, one-element element (the structure having two poles and an overcurrent tripping mechanism only in one pole) can be easily configured according to the earth leakage breaker having the above configuration. . That is, as shown in FIGS. 10 and 11, the overcurrent tripping device 60 and the trip bar 98 are unitized.
It can be easily replaced with other parts. Therefore, as shown in FIG. 10 and FIG. 11, a configuration without the overcurrent trip device and the trip bar can be easily obtained at the rear pole.

In the above-described embodiment, the size of the one-pole product in the collective wiring breaker for a light distribution board has been described. The present invention is not limited to the size of the common type circuit breaker for wiring, but can correspond to various sizes.

[0048]

Since the present invention is configured as described above, it has the following effects.

According to the earth leakage breaker of the present invention, mechanisms such as an overcurrent tripping device, an earth leakage tripping mechanism, an opening / closing mechanism, and a trip bar are unitized and fitted into a synthetic resin housing. Because of this configuration, it is possible to obtain a two-pole earth leakage breaker with the same outer dimensions as the one-pole configuration of the common-type wiring breaker for a light distribution board, for example.

In the overcurrent trip device, the terminal portion is deformed by pushing a drooping terminal portion formed by cutting and bending the terminal portion to which the bimetal is fixed with an adjusting screw or returning the terminal portion to the original position. By adjusting the position of the free end of the bimetal, a large current is not shunted through the adjustment screw, and no stress is applied to the joint between the bimetal and the terminal. The problem of the fluctuation of the removal time is eliminated.

Further, since the adjusting screw is screwed to the fixed iron piece provided in the terminal portion near the terminal where the bimetal is fixed, the strength of the adjusting screw portion is increased and the problem that the screw is broken can be solved.

Furthermore, since the flexible conductor that electrically connects the bimetal and the movable contact is arranged so as not to face the current-carrying portion of the bimetal, there is no possibility that the flexible conductor contacts the bimetal. Therefore, an insulating tube as in the conventional device is not required.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a cut-away part of an earth leakage breaker according to Embodiment 1 of the present invention to show the inside.

FIG. 2 is a front sectional view showing a state where the earth leakage breaker of FIG. 1 is in an open circuit state.

FIG. 3 is a front sectional view showing a state where the earth leakage breaker of FIG. 1 is in a trip state.

FIG. 4 is a rear sectional view showing a state where the earth leakage breaker of FIG. 1 is in a closed state.

FIG. 5 is a rear sectional view showing a state where the earth leakage breaker of FIG. 1 is in an open circuit state.

FIG. 6 is a rear sectional view showing a state where the earth leakage breaker of FIG. 1 is in a trip state.

FIG. 7 is an enlarged front sectional view showing an overcurrent trip device of the present invention.

FIG. 8 is an enlarged plan view of the overcurrent trip device of FIG. 7;

FIG. 9 is an enlarged front sectional view showing the overcurrent tripping device of the present invention.

FIG. 10 is a rear cross-sectional view showing the inside by cutting out a part of the earth leakage breaker of the second embodiment.

11 is a rear cross-sectional view showing a state where the earth leakage breaker of FIG. 10 is in an open circuit state.

FIG. 12 is a configuration diagram of a unitized overcurrent trip device.

FIG. 13 is a configuration diagram of a unitized earth leakage trip mechanism.

FIG. 14 is a configuration diagram of a unitized opening and closing mechanism.

FIG. 15 is a configuration diagram of a trip bar unit formed as a unit.

FIG. 16 is an external view of a crossbar used in the earth leakage breaker of the present invention.

FIG. 17 is an external view of a locking lever used in the earth leakage breaker of the present invention.

FIG. 18 is an external view of an arm used in the earth leakage breaker of the present invention.

FIG. 19 is an external view of a trip lever used in the earth leakage breaker of the present invention.

FIG. 20 is an explanatory diagram when the opening / closing mechanism according to the present invention is in an ON state.

FIG. 21 is an explanatory diagram when the opening / closing mechanism of the present invention is in an OFF state.

FIG. 22 is a front sectional view showing a conventional earth leakage breaker.

FIG. 23 is a front sectional view showing a state where the earth leakage breaker of FIG. 20 is in an open circuit state.

24 is a front sectional view showing a state where the earth leakage breaker of FIG. 20 is in a trip state.

FIG. 25 is an enlarged front view showing a connection state between a conventional bimetal and a power supply terminal.

[Explanation of symbols]

40 first cover, 41 base, 42 second cover, 43 insulating housing, 44 fixed contact, 45 fixed contact, 46 movable contact, 47 movable contact, 48 crossbar, 51 flexible conductor, 60 overcurrent Tripping device, 6
1 power supply side terminal, 62 bimetal, 63 fixed iron piece,
64 Movable iron piece, 66 Adjustment screw, 67 Movable iron piece, 6
9 Opening / closing mechanism, 70 frame, 72 locking lever,
76 handle, 81 load side terminal, 82 zero-phase current transformer, 83 control circuit, 84 earth leakage trip device, 87
Electromagnet part, 89 Leakage trip display button, 91 trip lever, 95 guide plate, 96 handle spring, 98 trip bar.

Claims (7)

[Claims] 1. A power supply terminal, a bimetal having one end joined to a terminal portion of the power supply terminal, a fixed iron piece that generates an electromagnetic force in accordance with a current flowing through the bimetal, and a bimetal connected to the other end of the bimetal. A movable contact connected via a flexible conductor, and a unitized overcurrent tripping mechanism, a load-side terminal, and the movable contact connected to the load-side terminal via a main conductor; A fixed contact that is brought into contact with and separated from the main conductor, a zero-phase current transformer provided in the main conductor, and a control circuit unit that detects an output of the zero-phase current transformer and generates a signal for tripping leakage current. And an electromagnet section that is activated by the leakage trip signal, and includes a housing that houses the unitized leakage trip mechanism section, the overcurrent trip mechanism section, and the leakage trip mechanism section. Earth leakage breaker characterized by the following. 2. A power supply terminal, a bimetal having one end joined to a terminal portion of the power supply terminal, a fixed iron piece that generates an electromagnetic force according to a current flowing through the bimetal, and a bimetal connected to the other end of the bimetal. A pair of movable contacts connected via a flexible conductor, and a unitized overcurrent tripping mechanism, a pair of load-side terminals, connected to the load-side terminals via a main conductor; A pair of fixed contacts that are brought into contact with and separated from the movable contact, a zero-phase current transformer provided in the main conductor, and a signal for detecting an output of the zero-phase current transformer to remove a ground fault. A control circuit unit that generates a signal, an electromagnet unit operated by the signal of the earth leakage trip, and an earth leakage trip indicator that responds to the operation of the electromagnet unit, and a unitized earth leakage trip mechanism unit, The overcurrent trip mechanism and An earth leakage breaker, comprising: a housing for accommodating an earth leakage tripping mechanism. 3. A handle for manual operation, a link mechanism interlocked with the operation of the handle for manual operation, a crossbar connected to the link mechanism and formed so as to fit the movable contact, A movable iron piece attracted by the electromagnetic force of the fixed iron piece of one of the fixed iron pieces, a locking lever driven by the movable iron piece or the bimetal on the one pole side to cause a tripping operation, A trip lever which causes a tripping operation when an electromagnet section operated by a trip signal is actuated, and a frame for assembling these parts, and further comprising a unitized opening / closing mechanism, The earth leakage breaker according to claim 2, wherein the mechanism is housed in a housing. 4. A trip bar formed so as to be driven by a bimetal of the other pole of a pair of bimetals, and a movable iron piece attracted by the electromagnetic force of a fixed iron piece of the other pole is provided on the trip bar. Driving by the bimetal, or, when the movable iron piece is sucked by the fixed iron piece, is formed to cause a tripping operation via the locking lever, and includes a trip bar part unitized, The earth leakage breaker according to claim 2 or 3, wherein the trip bar portion is housed in a housing. 5. The overcurrent trip device according to claim 1, wherein the adjusting screw is screwed to a terminal portion near the bimetal fixed, and the hanging terminal formed by cutting and bending the terminal portion to which the bimetal is fixed is formed. The terminal portion is deformed by pushing in with a screw or returning to an original position to adjust the position of the free end of the bimetal. The earth leakage breaker according to any one of the above. 6. The earth leakage circuit breaker according to claim 5, wherein an adjustment screw is screwed to a fixed iron piece provided in a terminal portion near the bimetal is fixed. 7. A flexible conductor which electrically connects a bimetal and a movable contact is disposed so as not to face a current-carrying portion of the bimetal.
The earth leakage breaker according to claim 6.