| 摘要 |
In an electronic circuit breaker, a first changeover switch (5) whose opening/closing time is controlled by a control signal from a microcomputer (6) is connected in series between a current transformer (1) that detects a current of a main circuit and a rectifire circuit (2) that rectifies the secondary output of the current transformer (1); and a signal to be inputted to the rectifire circuit (2) is alternately switched between a signal outputted from the current transformer (1) and a test signal outputted from a test signal output circuit (11), thereby providing a self-diagnostic function capable of periodically and automatically performing an operational test without interrupting power feed to loads. |
