| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a ground fault interrupter with a current leakage measuring display device allowing the measurement and display of a leakage current value for an electric circuit and the correction of the measurement without causing a closing contact to be switched off by the ground fault interrupter even when a current leakage exceeding a set value for the sensitivity of the ground fault interrupter is flowing in the electric circuit. <P>SOLUTION: The ground fault interrupter comprises a zero-phase current transformer 4 for detecting the current leakage in the electric circuit, a ground fault tripping device 6 having a comparison circuit 9 for comparing a voltage signal corresponding to a detection signal from the zero-phase current transformer with reference voltage and generating an output signal when the voltage signal exceeds the reference voltage and a trigger circuit 11 for opening a contact in the electric circuit in accordance with the output signal from the comparison circuit, and the current leakage measuring display device 13 for displaying the current leakage in accordance with the voltage signal. The ground fault tripping device 6 is provided with a switch 20 for short-circuiting an input signal or the output signal from the comparison circuit 9. <P>COPYRIGHT: (C)2003,JPO</p> |
