Residual current circuit breaker

Abstract

The present invention provides an electric leakage circuit breaker which is a multipole leakage breaker. The inner part of a main case is carried with an opening and closing mechanism for the main circuit connection point, an excess current tripping device, and an electric leakage tripping part which combines an electric leakage detection circuit and a tripping operation coil unit on a null phase current transformer. Flexible stranded wires (15) as the primary conductor of the null phase current transformer (5) are wound between the excess current tripping device (4) of poles and a load terminal (14). The stranded wires of the null phase current transformer and the primary conductor thereof are installed on a unit assembling armature (18) made of casting resin and in are assembled in the main case. The unit assembling armature is provided with guard wall parts between poles (18a), retaining parts for retaining the stranded wires (18b, 18c), retaining sheets for retaining the stranded wires (18d, 18e), stranded wires of the primary conductor keeping through the null phase current transformer along prescribed wire path, and a hasp fitting piece (18f) and an eave shaped fin (18g) for retaining the null phase current transformer (5) at a prescribed position.

Description

technical field [0001] The present invention relates to a leakage circuit breaker suitable for a low-voltage power distribution system. More specifically, the present invention relates to an assembly structure of a zero-phase converter mounted in a leakage circuit breaker and its peripheral components. Background technique [0002] In addition to having the same overcurrent protection function components as the circuit breaker for wiring, the above leakage circuit breaker is also equipped with a zero-phase zero-phase circuit breaker that uses the main circuit as a primary conductor to detect the unbalanced current of the main circuit in the main body box of the circuit breaker. A current transformer, a leakage detection circuit that detects the occurrence of a ground fault based on the secondary output level of the zero-phase current transformer, and a tripping circuit that trips a circuit breaker after receiving an output signal from the leakage detection circuit The leakag...

AI Technical Summary

Problems solved by technology

Therefore, in the actual product assembly process, the operator uses tweezers or the like to arrange the above-mentioned wires one by one along the prescribed wiring path. This operation consumes labor and time, and the assembly and wiring of the parts The labor cost of operators becomes the main reason for increasing the cost of products

[0014] In addition, an insulating tube is put on each wire such as the stranded wire 15 passing through the primary conductor of the zero-phase converter 5 in advance, or an insulating tape is wrapped for insulation protection, but the insulating tube is soft and easily damaged, so the wiring If it is rubbed against the edges and corners of other metal parts during operation, the tube will be easily damaged

In addition, if an insulating tape (for example, Teflon (Teflon) (registered trademark)) is wound on the wire, the wire itself is difficult to bend, and labor and time are consumed in the wiring operation.

[0015] In addition, in the structure disclosed in Patent Document 1, it is effective from the viewpoint of insulation protection that insulating barriers are provided inside the zero-phase converter to isolate the penetrating primary conductors, but as described above , in a small-capacity earth leakage circuit breaker that uses a flexible twisted wire 15 for penetrating a primary conductor, it is necessary to correct the twisted wire extending from the zero-phase converter 5 to Line 15, secondary output lines, signal lines, etc. are manually sorted one by one, such troublesome operation

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