| 摘要 |
PROBLEM TO BE SOLVED: To prevent unnecessary trip due to an in-rush current, without increasing the rated current of a circuit breaker.SOLUTION: A circuit breaker 1 includes an interrupting section 11 for interrupting power supply according to control, and a control section 12 where a first threshold having a reference period of power supplied consisting of a first half period and a second half period and larger than the rated value of a current in the power supplied, and a second threshold larger than the first threshold are determined, and when a value exceeding the second threshold is detected in the first half period, but a value exceeding the first threshold is not detected in the second half period, in the absolute value of current, the interrupting section 11 is controlled not to be interrupted.SELECTED DRAWING: Figure 1 |
