JP2002216612A - Earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small, reversely-connectable earth leakage breaker with narrow width. SOLUTION: In the breaker, a switch 8 setting a test circuit to ON/OFF is installed in a printed board 9 and the printed board 9 is provided on the bottom of a lower breaker case 10 located in a column with such a switching mechanism as an engaging piece 4, a toggle linkage section 5, or a crossbar 6. By connecting/disconnecting a movable contact 14 with a fixed contact 13, extensionally install the lower end of the crossbar 6 opening/closing a switching contact 7, and then use the vertical motion of the crossbar 6 to turn the switch 8 ON or OFF working with the motion of the switching contact 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage breaker having a test circuit for confirming whether or not a main circuit is normally interrupted when an earth leakage current is generated.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 6 to 8, an earth leakage breaker 41 detects an earth leakage of a main circuit by a zero-phase current transformer 42, and detects an earth leakage based on an output signal of the zero-phase current transformer 42. Drives the electromagnetic trip device 43. Electromagnetic trip device 4
3 operates the engaging piece 44, and operates the crossbar 46 via the toggle link mechanism 45 by the operation of the engaging piece 44. The cross bar 46 separates the movable contact 48 from the fixed contact 47, and the switching contact 49 is turned off.

Further, the leakage breaker 41 is provided with a test circuit in which a pseudo leakage current flows when a test button 50 is pressed to confirm that the main circuit is normally shut off when a leakage current occurs. Since the power supply of the test circuit is secured from the load side terminal 51, when the earth leakage breaker 41 is connected in order, a pseudo earth leakage current flows through the test circuit to make the switching contact 4
When the test circuit 9 is opened, the pseudo leakage current does not flow through the test circuit, but when the leakage breaker 41 is reversely connected,
Even if a pseudo leakage current flows through the test circuit to open the switching contact 49, the pseudo leakage current flows through the test circuit. Therefore, if the test button 50 is kept pressed by mistake, a pseudo leakage current will continue to flow in the test circuit, and the electromagnetic coil of the electromagnetic trip device 43 will be burnt.

Therefore, the test circuit is provided with a switch 52 for turning on and off the test circuit so that the pseudo leakage current does not continue to flow when the leakage breaker 41 is reversely connected. The switch 52 is mounted on a printed circuit board 53 on which a test circuit and a leakage detection circuit are mounted, and the printed circuit board 53 is installed in parallel with the opening / closing mechanism. One end of the crossbar 46 constituting the opening / closing mechanism is extended to above the printed circuit board 53, and the up / down movement of the crossbar 46 causes the opening / closing contact 4
The switch 52 was turned on and off in conjunction with opening and closing of the switch 9.

Further, as shown in FIG. 9, a switch 52 for turning on / off the test circuit and a printed circuit board 53 on which the test circuit is mounted are connected by a lead wire 54 so that the switch 52 is linked with an opening / closing mechanism. And the test circuit was turned on and off.

Further, FIGS. 3 to 3 of JP-A-8-180792 are disclosed.
As shown in FIG. 5, the earth leakage breaker has a switch plate (16b) for preventing the movable contact plate (16) from burning when the main circuit is on.
Is in contact with the burnout prevention switch fixed contact (18), and when the test button (15) is pressed, the test switch plate (16a) of the movable contact plate (16) is pushed down, and the test switch plate (16a) is moved to the test switch fixed contact ( 17), a pseudo-leakage current flows through the test circuit by contact. A test-off lever (24) interlocking with a crossbar (23) for opening and closing the on-off contact is disposed below the burnout prevention switch plate (16b), and the main circuit is turned on and the test-off lever (24) is lowered. Then, when the test button (15) is pressed, the burnout prevention switch plate (16b) comes into contact with the burnout prevention switch fixed contact (18). When the main circuit is turned off, the test off lever (24) is raised and the burnout prevention switch fixed contact (18) is raised. 18) Burnout prevention switch plate (1)
6b) is opened and the pseudo leakage current does not flow through the test circuit even when the test button (15) is kept pressed.

[0007]

[0006] However, FIGS.
The earth leakage breaker 41 shown in FIG. 8 has a problem that the width of the earth leakage breaker 41 becomes wide because the switching mechanism and the printed circuit board 53 are arranged side by side, and is not suitable for forming an earth leakage breaker having a narrow width. Was. The earth leakage breaker shown in FIG.
Although the switch 52 can be freely arranged, the use of the lead wire 54 may hinder the operation of the opening and closing mechanism. Therefore, the arrangement near the opening and closing mechanism is not suitable, and the cost increases. There was a problem. Further, Japanese Unexamined Patent Publication No.
The electric leakage breaker of No. 180792 has a problem that the structure is complicated and large, and is not suitable for a small electric leakage breaker having a narrow lateral width.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional earth leakage breaker, an object of the present invention is to provide a small earth leakage breaker having a small width and which can be connected in reverse. A zero-phase current transformer that detects a leakage of a circuit and outputs a signal, a leakage detection circuit that detects a leakage by an output signal of the zero-phase current transformer, and an electromagnetic trip device that is driven by an output signal of the leakage detection circuit. , An engaging piece operated by an electromagnetic trip device,
A crossbar interlocking with the operation of the engaging piece via the toggle link mechanism, an open / close contact that is opened and closed by the operation of the crossbar, a test circuit that simulates abnormalities, a leakage detection circuit, and a test circuit are mounted. In an earth leakage circuit breaker having a printed circuit board and capable of reverse connection, a printed circuit board is arranged in tandem with an opening / closing mechanism, and a switch for turning on / off a test circuit in conjunction with the opening / closing mechanism is provided on the printed circuit board. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A switch for turning on / off a test circuit is mounted on a printed circuit board, and the printed circuit board is connected to an opening / closing mechanism such as a hook, a toggle link mechanism, a crossbar, or the like in a lower circuit breaker in a tandem position. Provided at the bottom of the case.
The lower end of the crossbar that opens and closes the open / close contact by moving the movable contact to / from the fixed contact extends, and the switch is turned on / off in conjunction with the opening / closing of the open / close contact by vertical movement of the crossbar.

[0010]

FIG. 1 shows a first embodiment of an earth leakage breaker according to the present invention.
And the accompanying drawings of FIG.

An earth leakage breaker 1 includes a zero-phase current transformer 2 for detecting an earth leakage of a main circuit and outputting a signal, and an earth leakage detecting circuit (not shown) for detecting an earth leakage based on an output signal of the zero-phase current transformer 2. )When,
An electromagnetic tripping device 3 driven by an output signal of the leakage detection circuit, and a hook 4 operated by the electromagnetic tripping device 3
A crossbar 6 interlocked with the operation of the engaging piece 4 via the toggle link mechanism 5, an open / close contact 7 opened / closed by the operation of the crossbar 6, and a test circuit (not shown) for simulating abnormalities. ), A switch 8 for turning on / off the test circuit, and a printed circuit board 9 on which the leakage detection circuit and the test circuit are mounted.

When the test button 11 protruding from the upper surface of the circuit breaker case 10 is pressed, a pseudo leakage current flows through the test circuit, and the test circuit checks whether the leakage breaker 1 normally shuts off the main circuit. it can. In this test circuit, the power supply is secured from the load-side terminal 12, so that if the leakage breaker 1 is connected in reverse and the test button 11 is kept pressed, the pseudo leakage current does not continue to flow in the test circuit. A switch 8 is provided.

The switch 8 is mounted on a printed circuit board 9, and the printed circuit board 9 is provided with a hook 4 or a toggle link mechanism 5.
It is provided at the bottom of the lower circuit breaker case 10 shown in FIG. The lower end of the crossbar 6 that opens and closes the switching contact 7 by bringing the movable contact 14 into and out of contact with the fixed contact 13 is extended, and the switch 8 is operated in conjunction with the opening and closing of the switching contact 7 by the vertical movement of the crossbar 6. On and off.

When the switching contact 7 is turned on, the switch 8 is turned on. Here, when the test button 11 is pressed to cause a pseudo leakage current to flow through the test circuit, the zero-phase current transformer 2 detects the leakage, and the leakage detection circuit detects the electromagnetic tripping device 3 by the output signal of the zero-phase current transformer 2. Drive. The electromagnetic tripping device 3 rotates the hooking piece 4 so that the trip arm 5a of the toggle link mechanism 5 that pushes down the crossbar 6 against a spring (not shown) arranged below the crossbar 6 can be used. One end releases the engagement with the engaging piece 4. As a result, the spring pushes up the cross bar 6 and the trip arm 5a to separate the movable contact 14 from the fixed contact 13 and the switching contact 7 is turned off. When the crossbar 6 moves upward, the switch 8 is turned off.

A second embodiment of the earth leakage breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.

The earth leakage breaker 21 is a zero-phase current transformer 22 for detecting an earth leakage of the main circuit and outputting a signal, and an earth leakage detecting circuit (not shown) for detecting an earth leakage based on an output signal of the zero-phase current transformer 22. ), An electromagnetic trip device 23 driven by an output signal of the leakage detection circuit, a hooking piece 24 operated by the electromagnetic tripping device 23, and a crossbar interlocked with the operation of the hooking piece 24 via a toggle link mechanism 25. 26, an open / close contact 27 opened / closed by the operation of the crossbar 26, a test circuit (not shown) for simulating an abnormality, a switch 28 for turning on / off the test circuit, an electric leakage detection circuit, and a test circuit. And a printed circuit board 29 on which is mounted.

When a test button 31 protruding from the upper surface of the circuit breaker case 30 is pressed, a pseudo leakage current flows through the test circuit, and the test circuit checks whether the leakage breaker 21 normally shuts off the main circuit. it can. In this test circuit, the power supply is secured from the load side terminal 32, so that if the leakage breaker 21 is connected in reverse and the test button 31 is kept pressed, the pseudo leakage current does not continue to flow in the test circuit. A switch 28 is provided.

The switch 28 is mounted on a printed circuit board 29, and the printed circuit board 29 is erected on the left side as shown in FIG. ing. The switch 28 is turned on and off in conjunction with the opening and closing of the open / close contact 27 by the trip arm 25a of the toggle link mechanism 25 that moves up and down when the open / close contact 27 is opened and closed.

When the switching contact 27 is turned on, the switch 28 is turned on. Here, when the test button 31 is pressed to supply a pseudo leakage current to the test circuit, the zero-phase current transformer 22
Detects this leakage, and the leakage detection circuit drives the electromagnetic trip device 23 based on the output signal of the zero-phase current transformer 22. The electromagnetic tripping device 23 rotates the hooking piece 24 so that the crossbar 2 is opposed to a spring 33 disposed below the crossbar 26.
One end of the trip arm 25 a of the toggle link mechanism 25 that is pushing down 6 releases the engagement with the engaging piece 24.
As a result, the spring 33 pushes up the cross bar 26 and the trip arm 25a, so that the fixed contact 34 and the movable contact 35
And the contact 27 is turned off. The switch 28 is turned off when the trip arm 25a moves upward.

Although the printed circuit board is provided on the power supply side in this embodiment, the printed circuit board may be provided on the load side as long as it has a positional relationship with the opening / closing mechanism in tandem.

[0021]

As described above, the earth leakage breaker according to the present invention detects the earth leakage of the main circuit and outputs a signal, and the earth leakage is detected by the output signal of the zero phase current transformer. A leakage detection circuit, an electromagnetic trip device driven by an output signal of the leakage detection circuit, a hook operated by the electromagnetic trip device, a crossbar interlocked with the operation of the hook via a toggle link mechanism, and a cross. In a reverse connectable earth leakage breaker including an open / close contact that is opened / closed by the operation of the bar, a test circuit that simulates an abnormality, and a printed circuit board on which the earth leakage detection circuit and the test circuit are mounted, A printed circuit board is arranged in tandem, and a switch that turns the test circuit on and off in conjunction with the opening and closing mechanism is provided on the printed circuit board. And it has a superior effect that it is.

[Brief description of the drawings]

FIG. 1 is a plan view showing an earth leakage breaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a plan view showing an earth leakage breaker according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3 with a handle of the earth leakage breaker turned off.

FIG. 5 is a sectional view taken along line CC of FIG. 3;

FIG. 6 is a plan view showing the inside of a conventional earth leakage breaker.

FIG. 7 is a sectional view taken along line DD in FIG. 6;

FIG. 8 is a sectional view taken along line EE of FIG. 6;

FIG. 9 is a diagram showing a main part of a conventional earth leakage breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leakage breaker 2 Zero-phase current transformer 3 Electromagnetic trip device 4 Engagement piece 5 Toggle link mechanism part 5a Trip arm 6 Cross bar 7 On-off contact 8 Switch 9 Printed circuit board 10 Breaker case

Claims (1)

[Claims] 1. A zero-phase current transformer for detecting a leakage of a main circuit and outputting a signal, a leakage detection circuit for detecting a leakage based on an output signal of the zero-phase current transformer, and an output signal of the leakage detection circuit An electromagnetic tripping device driven by the electromagnetic tripping device, an engaging piece operated by the electromagnetic tripping device, a crossbar interlocking with the operation of the engaging piece via a toggle link mechanism, and an opening and closing opened and closed by the operation of the crossbar A contact, a test circuit that simulates an abnormality, a switch that turns on and off the test circuit in conjunction with opening and closing of the open / close contact, and a print on which the leakage detection circuit, the test circuit, and the switch are mounted. In a reverse connectable earth leakage circuit breaker having a board, the printed circuit board is arranged in tandem with the switching mechanism, and the test circuit is turned on / off on the printed board in conjunction with the switching mechanism. An earth leakage breaker provided with a switch for turning off the power.