EARTH LEAKAGE BREAKER AND METHOD FOR CONTROLLING EARTH LEAKAGE BREAKER

摘要

The present invention relates to an earth leakage circuit breaker and a method for controlling the earth leakage breaker, wherein the earth leakage breaker is formed between three-phase electrical lines and a single-phase load connected to two electrical lines of the three-phase electrical lines. The earth leakage breaker is characterized by comprising: a zero-phase current detection unit for detecting a zero-phase current generated in a zero current transformer formed in the three-phase electrical lines; a voltage detection unit for detecting a voltage from each of the two electrical lines; a trip unit for tripping contact points between the two electrical lines and the single-phase load when a trip signal is inputted; and a control unit which, when the zero-phase current is detected by the zero-phase current detection unit, detects an electrical line, in which the voltage has dropped by a predetermined level or more, from among the two electrical lines on the basis of the voltage detection result of the voltage detection unit, and which generates the trip signal and outputs the trip signal to the trip unit when the electrical line in which the voltage has dropped by a predetermined level or more exists.