JP3173636B2 - Earth leakage breaker with auxiliary switch - Google Patents

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 breaker having an auxiliary switch for detecting an on / off state of a main body of the earth leakage breaker, and more particularly to a mounting structure of the auxiliary switch.

[0002]

2. Description of the Related Art A device described in Japanese Utility Model Laid-Open Publication No. Sho 62-155448 is known as a mounting device for the auxiliary switch. In this mounting device, a support plate is fixed by caulking to a side plate which is a support member of the opening / closing mechanism, and an auxiliary switch is mounted on the support plate by screws.

[0003]

Not all the earth leakage breakers are provided with auxiliary switches, but only those which are necessary according to the specification of the presence or absence of the auxiliary switches.
Therefore, in the earth leakage circuit breaker according to the conventional mounting device, the auxiliary switch is mounted on the side plate at the same time as the assembling of the opening and closing mechanism. Even if it is tightened, it is troublesome, and the consistency of the work with the one without the auxiliary switch is hindered, which is a factor to reduce the work efficiency. Further, if the support plate is fixed to the side plate in advance before assembling the opening / closing mechanism, two types of side plates are stocked depending on the presence or absence of the auxiliary switch. there were. Therefore, an object of the present invention is to provide an earth leakage breaker with an auxiliary switch in which the auxiliary switch can be easily assembled.

[0004]

In order to achieve the above object, the present invention relates to an earth leakage breaker with an auxiliary switch having an auxiliary switch for detecting an on / off state of the earth leakage breaker body, wherein the auxiliary switch is attached to a base. The base is fitted to the yoke of the earth leakage trip device from the side, and when the yoke is screwed into the case of the earth leakage breaker, the base is fitted to the case from above and fixed. . In the above earth leakage breaker, if the earth leakage detection unit is connected to the power supply through the contact of the auxiliary switch, it is convenient for reverse connection of the main circuit wiring of the earth leakage breaker.

[0005]

According to the present invention, the base to which the auxiliary switch is attached is fitted into the yoke of the earth leakage trip device from the side, thereby restraining the yoke in the vertical direction, and then the yoke is screwed into the case of the earth leakage breaker. When the base is tightened, the base is fitted into the case from above, thereby constraining the base in the front, rear, left and right directions, and as a result, the base holding the auxiliary switch is fixed to the case. That is, in the present invention, the auxiliary switch can be fixed at the same time as the fastening of the earth leakage trip device by merely fitting, and no additional work such as caulking or screwing is required for mounting the auxiliary switch.

[0006] The power supply circuit of the leakage detector in the earth leakage breaker is generally connected to the load side main circuit of the earth leakage breaker, and power is supplied from the power supply side main circuit only when the earth leakage breaker is in the on state, and is turned off. Then the power is cut off. On the other hand, in a distribution board or the like, if multiple earth leakage breakers are distributed on both sides of the power line and arranged in the same direction, connect the power line to the load side terminal of the earth leakage In some cases, a reverse connection in which a load is connected to the side terminal is required. However, in such a reverse connection, even if the earth leakage breaker is turned off, the power of the earth leakage detection unit is not shut off, which is not preferable. Therefore, if the leakage detecting unit is connected to the power supply via the contact of the auxiliary switch, the power of the leakage detecting unit can be cut off by turning off the auxiliary switch contact simultaneously with the turning off of the leakage breaker even in the case of reverse connection.

[0007]

1 to 6 show an embodiment of the present invention. FIG. 1 is a side view of a main part of an earth leakage breaker showing an attached state of an auxiliary switch, and FIG. 2 is an earth leakage drawer holding the auxiliary switch. FIG. 3 is a side view of a main part showing a situation in which the removal device is inserted into the case of the earth leakage breaker; FIG. 3 is a front view showing a situation in which the base to which the auxiliary switch is attached is fitted to the yoke of the earth leakage trip device; 5 is a front view showing a state in which the base of FIG. 5 is fitted to a yoke of the earth leakage trip device, FIG. 5 is a plan view showing a state in which a cover of an earth leakage breaker provided with an auxiliary switch is removed, and FIG.
It is a longitudinal cross-sectional view of the earth leakage breaker of FIG.

In FIG. 3, an auxiliary switch 1 composed of a micro switch having a hinge type actuator 1a is shown.
Are fastened to the front surface of the flat base 2 made of mold resin by a tapping screw 3 in the drawing. On the surface on the opposite side of the base 2, a square convex portion 2 a is formed in a stepped shape by making the base 2 thinner on the upper and lower sides. In addition, the lower end of the base 2 has a prismatic convex portion 2b.
And two parallel plate pieces 2c and 2d sandwiching this from the left and right
Are integrally formed. On the other hand, the yoke 5 of the earth leakage tripping device 4 has a notch 5a corresponding to the protrusion 2a. Although a detailed configuration is omitted, the earth leakage trip device 4 is provided with a tripping electromagnet 6 and a armature 7 driven by a movable iron core on a yoke 5 made of a steel plate.
The yoke 5 is supported on a case of a ground fault circuit breaker via a mounting portion 5b bent and formed on a leg portion of the yoke 5, and is fixed by a screw screwed into a screw hole 5c.

Base 2 on which auxiliary switch 1 is mounted
The projection 2a is formed in the direction of the arrow in FIG.
And assembled in the state shown in FIG. Thereby, the base 2 is restrained in the vertical direction with respect to the yoke 5. Next, the earth leakage tripping device 4 in which the base 2 is combined with the yoke 5 is, as shown in FIG.
Is inserted from above. Here, case 8 has base 2
Groove 8a in the left-right direction corresponding to the convex portion 2b of the
Protrusions 8b are integrally formed corresponding to c and 2d. The case 8 has a mounting surface 8c corresponding to the mounting portion 5b of the yoke 5, and a through hole 8d is formed at the center thereof.

Therefore, as shown in FIG. 1, in the earth leakage trip device 4 inserted into the case 8, the mounting portion 5b of the yoke 5 is placed on the mounting surface 8c of the case 8, and at the same time, In the base 2, the convex portion 2 b enters the groove 8 a and the plate 2
Case 8 so that c and 2d sandwich the protrusion 8b from the left and right.
Is fitted to. Then, in this state, the screw hole 5 of the yoke 5
A screw 9 is screwed into c through the through hole 8d from the back side of the case 8, and the earth leakage trip device 4 is fixed. At this time,
The base 2 is constrained by the case 8 in the front-rear direction (the left-right direction in FIG. 1) via the convex portion 2b, and is constrained in the left-right direction (the direction perpendicular to the paper surface in FIG. 1) via the plate pieces 2c, 2d. . That is, in the mounting state of the earth leakage tripping device 4 of FIG. 1, the base 2 is fixed by being restrained in the vertical and horizontal directions.

In FIG. 5 and FIG. 6, the illustrated earth leakage circuit breaker having two poles is in an ON state, and the current flows through the main circuit of each pole from the power supply side terminal 10 to the fixed contact 11, the movable contact 12, the bimetal 13, and the lead. The current flows to the load terminal 16 via the wire 14 and the relay conductor 15. The opening / closing mechanism 17 is installed in the middle between the left and right poles, and its detailed configuration is omitted. However, when the opening / closing handle 18 is rotated from the off position shown by the broken line in FIG. The latch member 21 is pushed down, and at the same time, the opening / closing member 20 made of an insulator that straddles the left and right movable contacts 12 is also pushed down,
The movable contact 12 is closed as shown. Further, when the opening / closing handle 18 is turned again to the off position shown by the broken line, the latch member 20 is lifted, and the movable contact 12 is separated while pushing up the opening / closing member 21 by its own spring force.

An earth leakage tripping device 4 combined with a base 2 holding an auxiliary switch 1 is mounted between an opening / closing mechanism 17 and a power supply terminal 10, and as shown in FIG. The auxiliary switch 1 is located above the movable contact 12 on the left pole side. Here, the distal end of the latch member 20 extends in a V-shape (see FIG. 6) toward the power supply as an operation portion 20a, and the operation portion 20a operates the actuator 1a of the auxiliary switch 1. That is, in FIG.
In the off state of the earth leakage breaker, the operation unit 20a is located at the position shown by the broken line and is separated from the actuator 1a, and the auxiliary switch 1 sends an off signal.
0a descends to the solid line position and pushes the actuator 1a as shown, so that the auxiliary switch 1 sends an ON signal.

Referring again to FIGS. 5 and 6, a leakage detecting section 22 is arranged so as to surround the lead wire 14 of the left and right poles. The leakage detecting unit 22 includes a zero-phase current transformer and an electronic circuit for amplifying the output. When a leakage is detected, the tripping electromagnet 6 is excited to drive the armature 7 and constitute a part of the switching mechanism 17. The trip bar 23 is pushed rightward in FIG. Although not shown, the trip bar 23 locks the right end of the latch member 20 in FIG. 6. Therefore, when the trip bar 23 is pressed, the latch member 20 rotates clockwise in FIG. 6 to open the opening / closing member 21. . As a result, the movable contact 12 is separated (trip operation), and at the same time, the operation unit 20a is separated from the actuator 1a, and the auxiliary switch 1 sends an off signal. In addition, when the conduction current becomes an overcurrent state, the bimetal 1
3 is bent rightward in FIG. 6 and pushes the trip bar 23, so that the earth leakage breaker trips also in this case. The power supply circuit of the leakage detecting unit 22 is connected to the relay conductor 1 on the load side via the contact of the auxiliary switch 1 which is turned off when the leakage breaker is turned off.
5 is connected.

[0014]

As described above, according to the present invention, when the base to which the auxiliary switch is attached is fitted from the side to the yoke of the earth leakage tripping device, and this yoke is then screwed to the case of the earth leakage breaker, The base is fitted and fixed to the case from above. Therefore, according to the present invention, when assembling the auxiliary switch to the earth leakage breaker main body, additional work such as caulking and screw tightening is not required, and the auxiliary switch previously attached to the base and stocked is required. The earth leakage breaker with the auxiliary switch can be easily configured simply by combining it with the earth leakage tripping device in accordance with the situation. It does not drop. Also, if the leakage detector is connected to the power supply via the contact of the auxiliary switch, the leakage detector will be connected via the auxiliary switch contact when the leakage breaker is turned off even if the main circuit wiring of the leakage breaker is reversely connected. Can be turned off.

[Brief description of the drawings]

FIG. 1 is a main part side view showing an assembled state of an auxiliary switch of an earth leakage breaker showing an embodiment of the present invention.

FIG. 2 is a side view of a main part showing a situation in which an earth leakage trip device holding an auxiliary switch is inserted into a case of an earth leakage breaker.

FIG. 3 is a front view showing a situation in which a base to which an auxiliary switch is attached is fitted to a yoke of an earth leakage trip device.

FIG. 4 is a front view of a state in which a base of the auxiliary switch is fitted to a yoke of the earth leakage trip device.

FIG. 5 is a plan view showing a state in which a cover of an earth leakage breaker having an auxiliary switch is removed.

FIG. 6 is a longitudinal sectional view of the earth leakage breaker of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auxiliary switch 2 Base 4 Leakage trip device 5 Yoke 6 Tripping electromagnet 7 Armature 8 Case 10 Power supply side terminal 11 Fixed contact 12 Moving contact 16 Load side terminal 17 Opening / closing mechanism 20 Latch member 21 Opening / closing member 22 Leakage detecting section 23 Trip Bar

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01H 83/02

Claims (2)

(57) [Claims] 1. An earth leakage circuit breaker with an auxiliary switch having an auxiliary switch for detecting an on / off state of an earth leakage circuit breaker main body, wherein the auxiliary switch is mounted on a base, and the base is fitted to a yoke of an earth leakage trip device from a side. The earth leakage breaker with an auxiliary switch, wherein the base is fitted and fixed to the case from above when the yoke is screwed to the case of the earth leakage breaker. 2. An earth leakage breaker with an auxiliary switch according to claim 1, wherein said earth leakage detecting section is connected to a power supply via a contact of said auxiliary switch.