JP4475748B2 - Earth leakage breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leakage breaker incorporating a leakage detection set.
[0002]
[Prior art]
As shown in FIG. 4, the conventional earth leakage breaker detects the earth leakage by the current detection element of the earth leakage detection set 51, and is connected to the trip device 52 that operates based on the earth leakage information of the circuit parts including the lead parts and the chip parts. In the container case 50, they were installed separately.
[0003]
[Problems to be solved by the invention]
However, in this conventional device, the leakage detection set 51 and the trip device 52 are connected by the lead wire 54 via the relay board 53, and therefore, the separated components must be connected. The connection work was troublesome.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is configured such that a leakage detecting element (7a) such as a zero-phase current transformer and a lead component (7b) are integrally disposed on one surface and a trip device (8) is disposed on the other surface. the leakage detection circuit board arranged integrally (6), so as to face the other surface of the trip device (8) to face the trigger plate (5) Rutotomoni該漏electrostatic detection circuit board (6) to the bimetal (11) It is characterized by being incorporated in the case (1) of the earth leakage circuit breaker . Moreover, you may provide a test finger in the other surface of a leak detection circuit board.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described in detail with reference to FIGS.
1 is a case of an earth leakage circuit breaker, 2 is a handle that is pivotally supported by the upper part of the case 1 and swings left and right to take on, off, and trip states. 3 is interlocked with the handle to open and close the fixed contact 3a. 4 is a cradle that is supported by the trigger plate 5 to turn the handle 2 on and off in a stable position. The cradle 4 is actuated by an abnormal current so that the cradle 4 is supported. The movable contactor 3 is forcibly released and the handle 2 is brought into a trip state.
[0006]
6 is a leakage detection circuit board. On one surface of the leakage detection circuit board 6, a leakage detection element 7a such as a zero-phase current transformer of a leakage detection set 7 and a lead component 7b such as a limiting resistor / IC are arranged. . On the other surface of the leakage detection circuit board 6 is disposed a trip device 8 that operates according to leakage information from the leakage detection set 7 to release the trigger plate 5. The leakage detection circuit board 6 is incorporated in the case 1 of the leakage breaker with the trip device 8 facing the trigger plate 5. The trigger plate 5 is disposed in a space formed by the leakage detection circuit board 6 and the trip device 8.
[0007]
Reference numeral 9 denotes a test finger for confirming the operating state of the trip device 8 by operating the push button 10 facing the upper surface of the case 1, and the test finger 9 is provided on the other side of the leakage detection circuit board 6 on the side of the trip device 8. Is provided. 11 is a bimetal that bends due to heat generated by overcurrent and operates the trigger plate 5 to the release side of the cradle 4. The bimetal 11 has a lower end between the other surface of the leakage detection circuit board 6 and the trigger plate 5 and a lower surface of the case 1. And attached to the back plate portion 12a of the support frame metal fitting 12 attached to the frame. 13 is an electromagnet device that operates the trigger plate 5 instantaneously when an excessive current at the time of a short circuit flows. The electromagnet device 13 has a magnetic plate 5 a attached to the back surface of the trigger plate 5 and both side surfaces and the back surface of the bimetal 11. The trigger plate 5 is attached to the cradle 4 by adsorbing the magnetic plate 5a by the frame metal member 14 by the electromagnetic force generated by the bimetal 10 and comprising the frame metal member 14 having a U-shaped cross-section continuously provided on the upper part of the enclosed support frame metal member 12. It is operated on the release side.
[0008]
In the illustrated embodiment, the trigger plate 5 is of a type in which the lower portion of the trigger plate 5 is pivotally attached to the support frame bracket 12 and swings upward. The electric leakage detection circuit board 6 is arranged above the trigger plate 5 and the upper end of the trigger plate 5 is engaged with the engaging portion 8a of the trip device 8, and the electric leakage detection set 7 is arranged below. When the upper part of 5 is pivotally attached to the case 1 by an appropriate means and swings downward, the trip device 8 is disposed below the leakage detection circuit board 6 and the leakage detection set 7 is moved upward. It will be placed.
[0009]
In this configuration, when a leakage current is generated in the circuit, the leakage detection set 7 detects the leakage current, operates the trip device 8 to release the support of the cradle 4 by the trigger plate 5 and forces the movable contact 3. The disengagement and the tripping of the handle 2 are the same as those of a ground fault circuit breaker incorporating a conventional ground fault detection circuit.
[0010]
In the present invention, a leakage detection element 7a such as a zero-phase current transformer, which is a leakage detection set 7, and a lead component 7b such as a limiting resistor / IC are disposed on one surface of the leakage detection circuit board 6, and a trip device 8 is disposed on the other surface. Since the leakage detection set 7 and the trip device 8 are connected by the leakage detection circuit board 6, a relay board and lead wires are unnecessary, and the number of parts can be reduced. Since there is no need to route the wire, the connection work is easy. Furthermore, since the leakage detection set 7 and the trip device 8 are integrated with the leakage detection circuit board 6, the assembling work into the case 1 is easy.
[0011]
Further, since the limiting resistor / IC of the leakage detecting set 7 is arranged on one surface opposite to the other surface of the leakage detecting circuit board 6 on which the trip device 8 facing the trigger plate 5 is arranged, the limiting resistor / IC And the bimetal 11 are separated from each other by the leakage detection circuit board 6 so that mutual heat generation does not interfere with each other. That is, there is no possibility that the tripping characteristic of the bimetal 11 will be adversely affected by the heat generation of about 60 ° of the limiting resistance necessary for stepping down to a few tens of volts DC where the electronic circuit operates. There is no risk that the limiting resistor IC will change over time and break down due to heat generation of about 110 °.
[0012]
Furthermore, the test finger 9 is arranged near the upper part of the case 1 of the earth leakage breaker and is provided on the other surface of the earth leakage detection circuit board 6, so that the earth leakage detection circuit board 6 can be accurately installed at a predetermined location by being incorporated in the case 1. It can be installed in. In addition, the number of components can be reduced by eliminating the need for a relay board and lead wires, and further, connection work is easy because there is no need to route lead wires.
[0013]
【The invention's effect】
As is apparent from the above description, the present invention provides a leakage detection circuit board in which a leakage detecting element such as a zero-phase current transformer and a lead component are disposed on one surface and a trip device is disposed on the other surface, and the trip device is a trigger plate. Since it is assembled in the case of the earth leakage circuit breaker, the number of parts can be reduced and the assembling work is facilitated.
Therefore, the present invention greatly contributes to the industry as a solution to the problems of conventional earth leakage breakers.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.
FIG. 2 is a perspective view of a leakage detection circuit board used in the embodiment of the present invention as viewed from one side.
FIG. 3 is a perspective view of a leakage detection circuit board used in the embodiment of the present invention as seen from the other surface side.
FIG. 4 is a partially cutaway side view showing a conventional example.
[Explanation of symbols]
1 Earth leakage breaker case 5 Trigger plate 6 Earth leakage detection circuit board 7 Earth leakage detection set 8 Trip device 9 Test finger

Claims (2)

The leakage detection circuit board (6) in which the leakage detecting element (7a) such as a zero-phase current transformer and the lead component (7b) are integrally disposed on one surface and the trip device (8) is integrally disposed on the other surface , trip device face was to incorporate other surface of Rutotomoni該漏electrostatic detection circuit board (6) to the face was in earth leakage breaker of the case (1) in the bimetal (11) in the trigger plate (5) to (8) A ground fault circuit breaker. The earth leakage breaker according to claim 1, wherein the test finger (9) is provided on the other surface of the earth leakage detection circuit board (6).

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