JPH11213849A - Ground-leakage circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the wiring and to improve the efficient thereof, while simplifying internal wiring of a ground circuit breaker and reducing the number of parts items. SOLUTION: A printed board 5 loaded with a ground leakage detecting circuit is assembled in a main body case, are lead wires 12 for power source drawn from the printed board is connected between phases of a main circuit conductors 3 which is continuously provided to terminal plates 2 and laid in the main body case to form a ground circuit breaker. A U-shaped tongue piece 3a projected from each main circuit conductor to a side is formed as a lead wire connecting part on the way of the main circuit conductor, and a tip of the lead wire for power source is inserted directly into the groove of the tongue piece for soldering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for wiring, and more particularly to a wiring structure inside the circuit breaker.

[0002]

2. Description of the Related Art First, the structure of an earth leakage breaker to which the present invention is applied and its internal circuit are shown in FIGS.
The illustrated example is a single-phase (two-pole) earth leakage breaker, and FIG. 3 shows only the essential components of the present invention in detail. First, in FIG. 3, 1 is a main body case of a circuit breaker as a resin molded product, 2 is a terminal plate, 2a is a terminal screw, 3 is a main circuit which is soldered to the terminal plate 2 and routed inside the main body case 1 for wiring. Conductor 4, zero-phase CT having main circuit conductor 3 as primary conductor, 5 is a printed board on which a leakage detection circuit is mounted, 6 is a test circuit section, 6a is a test button, 7 is an opening / closing operation connected to a contact opening / closing mechanism. It is a handle. As shown in FIG. 4, the printed circuit board 5 is connected between the phases of a single-phase main circuit to obtain a control power supply. Note that in FIG.
Is a tripping coil.

Next, FIGS. 5 and 6 show a conventional internal wiring structure corresponding to the main components of the above-mentioned earth leakage breaker. That is, in the conventional structure, the V-groove 2b is formed on the back surface of the leg 2a standing upright from the terminal plate 2 in an L-shape, and when the main circuit conductor (band-shaped conductor piece) 3 is brazed to the terminal plate 2, The control power supply lead wire (flexible insulated wire) 9 is connected to the V
It is inserted into the groove 2b, brazed together with the main circuit conductor 3, and pulled out.

On the other hand, separately from the above, lead wires 10, 11, and 12 are connected between the printed board 5, the zero-phase CT 4, and the trip coil 8, as shown in FIG. 2, the lead wire 9 drawn out from the printed circuit board 5, the lead wire 12 for the power supply drawn from the printed circuit board 5, and the tip of the lead wire 13 of the test circuit 6 are twisted together and soldered. After attaching the heat-shrinkable insulating tube 14 to the soldered portion, each lead wire is accommodated in the wiring space provided in the main case of the circuit breaker.

[0005]

By the way, in the above-mentioned conventional internal wiring structure, among the various lead wires, the power supply lead wire 12 for the printed board 5 in particular, has a different lead wire 9, It is necessary to perform soldering with 13 and so on, and wiring work including twisting of lead wires and coating of the insulation tube on the soldering part is troublesome and troublesome, and the number of wiring parts increases, which results in This is one factor that drives up product costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to simplify the internal wiring, reduce the number of wiring components, and perform wiring work inside the circuit breaker so that wiring work can be performed easily and efficiently. To provide an earth leakage breaker improved from the above.

[0007]

According to the present invention, in order to achieve the above object, according to the present invention, a printed circuit board having a leakage detecting circuit mounted on a main body case of a circuit breaker, and a power lead drawn out from the printed circuit board. In a ground fault circuit breaker connected between main circuit conductors laid in a main body case by connecting a wire to a terminal plate, a lead wire connecting portion is formed at an intermediate position of the main circuit conductor, and the power supply is connected to the lead wire connecting portion. Specifically, a U-shaped tongue protruding laterally from the main circuit conductor is formed as a lead wire connecting portion, and a power supply is provided in the groove of the tongue. The tip of the lead wire is inserted and soldered (claim 2).

According to this configuration, the power supply lead wire drawn from the printed board is connected to another lead wire on the connection path formed on the main circuit conductor without being twisted and soldered to another lead wire along the wiring route. Can be directly soldered to the tongue piece, thereby significantly reducing the number of wiring components and significantly improving the wiring work.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. In the drawings of the embodiment, the same members corresponding to FIG. 5 are denoted by the same reference numerals. That is, in the illustrated embodiment, a lead wire connecting portion is provided at an intermediate position of the main circuit conductor 3 in which one end is brazed to the terminal plate 2 and incorporated in the main body case, as shown in FIG.
As shown in (b), a U-shaped tongue 3a projecting laterally from the conductor 3 is formed, and the power supply lead wire 12 drawn out of the leakage detecting printed board 5 is used alone or in the test circuit section 6. The soldering (the soldering portion is indicated by reference numeral 15 in FIG. 2 (b)) is inserted into the groove 3b of the tongue piece 3a together with the lead wire 13 drawn out of the lead wire. In the lead wire soldering step, the lead wire 1
The tips (core wires) of the wires 2 and 13 are inserted into the grooves 3b of the tongue pieces 3a and temporarily fixed, and soldering is performed in this state.

[0010]

As described above, according to the present invention,
Leakage breaker incorporating a printed circuit board equipped with a leakage detection circuit in the body case of the circuit breaker, and connecting a power supply lead wire drawn from the printed circuit board to a main circuit conductor laid in the body case connected to a power supply side terminal plate. A lead wire connecting portion is formed at an intermediate position of the main circuit conductor, and the power supply lead wire is directly soldered to the lead wire connecting portion, specifically, extending laterally from the main circuit conductor. The U-shaped tongue is formed, and the tip of the power supply lead wire is inserted into the groove of the tongue and soldered, so that the wiring path is simplified as compared with the conventional internal wiring structure, and the wiring is simplified. Work can be greatly streamlined. Further, the number of wiring components and the number of soldering points are reduced as compared with the conventional structure, thereby improving the reliability as well as reducing the cost of the product.

[Brief description of the drawings]

FIG. 1 is a development view of an internal wiring structure according to an embodiment of the present invention.

FIG. 2 is a connection structure diagram of a main circuit conductor and a power supply lead wire in FIG. 1, wherein (a) is a perspective view showing a state before soldering the lead wire, and (b) is a state after soldering. Partial enlarged view showing

FIG. 3 is an overall configuration diagram of an earth leakage breaker;

FIG. 4 is an internal circuit diagram of an earth leakage breaker;

FIG. 5 is a development view of a conventional internal wiring structure.

FIG. 6 is an exploded perspective view of a main part in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Terminal board 3 Main circuit conductor 3a U-shaped tongue (lead wire connection part) 3b Groove 4 Zero-phase CT 5 Printed board 8 Trip coil 12 Power supply lead wire 15 Solder part

Claims (2)

[Claims] 1. A printed circuit board having a contact opening / closing mechanism, a zero-phase CT, a trip coil, and a leakage detection circuit mounted on a main body case of a circuit breaker, and a power supply lead wire drawn from the printed board is connected to a terminal board. In the earth leakage breaker connected between the main circuit conductors laid in the main body case in tandem with the main circuit conductor, a lead wire connection portion is formed at an intermediate position of the main circuit conductor, and the power supply lead wire is connected to the lead wire connection portion. An earth leakage breaker characterized by being directly soldered. 2. A circuit breaker according to claim 1, wherein a U-shaped tongue protruding laterally from the main circuit conductor is formed as a lead wire connecting portion provided on the main circuit conductor, and the groove of the tongue piece is formed. An earth leakage breaker characterized in that the tip of a power supply lead wire is inserted and soldered.