To provide an electronic ground-fault interrupter having an overcurrent determination function and a ground fault determination function which are integrated into a CPU that can suppress a tripping operation based on ground fault determination during a test of overcurrent characteristics for each pole unit of the interrupter through unipolar energization, and conducting a correct test of the overcurrent characteristics.
This electronic ground-fault interrupter has an unipolar energization detection unit 19 for detecting that one of electric circuits is unipole-energized from an output of a second constant voltage circuit 17, and invalidates the ground fault determination function of the CPU 18 having the overcurrent determination function and the ground fault determination function during such detection.
NOMURA TOSHIMITSU
JP2000312434A | 2000-11-07 | |||
JPH02121224A | 1990-05-09 | |||
JPH0660789A | 1994-03-04 |
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka