JP2005347090A - Earth leakage breaker - Google Patents

Abstract

An earth leakage circuit breaker capable of easily mounting an insulating member on a conductive plate penetrating a zero-phase current transformer is provided.
An insulating member includes a base portion 6a formed along the outer periphery of a substantially U-shaped R-phase conductive plate 2R and a U-shaped portion 5 of a T-phase conductive plate 2T, and upper and lower ends of the base portion 6a. Are formed in a U-shaped cross section with an overhanging portion 6b extending inwardly of the U-shaped portion 5, and the insulating members 6 are respectively provided on the R-phase conductive plate 2R and the T-phase conductive plate 2T. Then, after passing through the through-hole 1a of the zero-phase current transformer 1, the S-phase conductive plate 2S is interposed between the R-phase conductive plate 2R and the T-phase conductive plate 2T, and the zero-phase current transformer 1 By passing through the through hole 1a, the insulating member 6 is prevented from interfering with the S-phase conductive plate 2S and falling off.
[Selection] Figure 1

Description

  The present invention relates to an insulating structure of a conductive plate that penetrates a zero-phase current transformer.

  Conventionally, a structure for insulating a three-pole conductive plate composed of R, S, and T phases penetrated by a zero-phase current transformer incorporated in an earth leakage circuit breaker is disclosed in Patent Document 1, for example. . In the structure, an insulating member made of a rubber material is covered on a portion of the conductive plate that penetrates the through hole of the zero-phase current transformer to insulate each phase. The insulating member that covers the R-phase conductive plate and the T-phase conductive plate is substantially U-shaped because the R-phase conductive plate and the T-phase conductive plate are substantially U-shaped. An openable portion is formed over the entire length, and the insulating member that covers the S-phase conductive plate is formed in a cylindrical shape.

Japanese Patent No. 3275441 (FIGS. 11 and 12)

  For this reason, in the conventional earth leakage breaker, in order to cover the insulating member on the R-phase conductive plate and the T-phase conductive plate, it is necessary to widen the openable portion, which is difficult to mount and takes much labor.

  According to the present invention, a substantially U-shaped R-phase conductive plate and a T-phase conductive plate are passed through a through-hole of a zero-phase current transformer so that the open sides thereof are opposite to each other. In the earth leakage circuit breaker in which the S-phase conductive plate is penetrated between the T-phase conductive plates, it is formed in a U-shape along the outer periphery of the U-shaped portion of the R-phase conductive plate and the T-phase conductive plate. The overhanging portions are stretched at the upper and lower ends of the base portion toward the inside of the U-shaped portion to form the insulating member in a U-shaped cross section, and the insulating members are respectively covered with the R-phase conductive plate and the T-phase conductive plate. The R, S, and T phase conductive plates are insulated from each other.

  The earth leakage breaker of the present invention has an effect that the insulating member can be easily attached to the conductive plate.

  The insulating member has a substantially U-shaped R-phase conductive plate and a base formed along the outer periphery of the U-shaped conductive plate of the T-phase conductive plate, and is directed toward the inside of the U-shaped portion at the upper and lower ends of the base. After extending through the through-hole of the zero-phase current transformer, each of the R-phase conductive plate and the T-phase conductive plate is covered with an insulating member. The insulating member does not interfere with the S-phase conductive plate and fall off by interposing the S-phase conductive plate between the R-phase conductive plate and the T-phase conductive plate and passing through the through-hole of the zero-phase current transformer. To.

  An embodiment of an earth leakage circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.

  In the earth leakage circuit breaker, R, S, and T-phase conductive plates 2R, 2S, and 2T constituting the main electric circuit are inserted into the through-hole 1a of the zero-phase current transformer 1. The R-phase conductive plate 2R and the T-phase conductive plate 2T are formed in a substantially U-shape, the terminal portion 3 is provided at one end portion, and the bimetal 4 is provided at the other end portion. Further, the S-phase conductive plate 2S is formed in a straight shape, and the terminal portion 3 is provided at one end portion, and the other end portion is provided in the same manner as the R-phase conductive plate 2R and the T-phase conductive plate 2T. A bimetal 4 is provided. The R-phase conductive plate 2R and the T-phase conductive plate 2T are passed through the through-hole 1a of the zero-phase current transformer 1 so that the open sides are opposite to each other, and the S-phase conductive plate 2S is the R-phase conductive plate 2R. And the T-phase conductive plate 2T are passed through the through-hole 1a of the zero-phase current transformer 1.

  An insulating member 6 that insulates the phases of the conductive plates is attached to the R-phase conductive plate 2R and the T-phase conductive plate 2T. The insulating member 6 has U-shaped protruding portions 6b at the upper and lower ends of a base portion 6a formed in a U-shape in plan view so as to follow the U-shaped portion 5 of the R-phase conductive plate 2R and the T-phase conductive plate 2T. It is formed in a U-shaped cross section so as to extend perpendicularly to the base portion 6a toward the inside of the portion. The reason why the base portion 6a of the insulating member 6 is formed in a U shape in plan view is to insulate the conductive plates from each other and to insulate from the terminal portions 3 and the bimetal 4 of other poles. The protruding portion 6b is provided to prevent the dropout and to increase the insulation distance. For this reason, the dimension of the insulating member 6 is preferably such that it just covers the R-phase conductive plate 2R and the T-phase conductive plate 2T.

  The insulating member 6 may be mounted either before or after the R-phase and T-phase conductive plates 2R and 2T are passed through the through-hole 1a of the zero-phase current transformer 1, and after the insulating member 6 is mounted, the S-phase The conductive plate 2S is interposed between the U-shaped portion 5 of the R-phase conductive plate 2R and the U-shaped portion 5 of the T-phase conductive plate 2T and penetrates the through-hole 1a of the zero-phase current transformer 1. Thus, the insulating member 6 is prevented from interfering with the S-phase conductive plate 2S and falling off.

It is a perspective view which shows the principal part of the earth leakage circuit breaker which concerns on this invention. FIG. 2 is an exploded perspective view of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Zero phase current transformer 2R R phase conductive plate 2S S phase conductive plate 2T T phase conductive plate 6 Insulating member

Claims (1)

  A substantially U-shaped R-phase conductive plate and a T-phase conductive plate are passed through the through-holes of the zero-phase current transformer so that their open sides are in opposite directions, and the R-phase conductive plate and the T-phase conductive plate In the earth leakage circuit breaker in which the S-phase conductive plate is inserted between the conductive plates, the U-shaped portion is formed along the outer periphery of the U-shaped portion of the R-phase conductive plate and the T-phase conductive plate. Overhanging portions are extended from the upper and lower ends of the base portion toward the inside of the U-shaped portion to form an insulating member having a U-shaped cross section. The insulating member is formed of the R-phase conductive plate and the T-phase conductive member. An earth leakage circuit breaker characterized in that R, S, and T phase conductive plates are respectively insulated by covering the plates.

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