| 摘要 |
PROBLEM TO BE SOLVED: To prevent the erroneous use such as polarity error and non-insertion by passing a current detecting current transformer through a main conductor inside a wiring circuit breaker and an earth leakage breaker, and displaying polarity in a lead wire (secondary winding) of the current detecting current transformer for leading-out. SOLUTION: Load current of a main breaker is detected by a current detecting current transformer 9, and always input to a branch breaker with a built-in peak cut controller. When the load current exceeds a preset current value, an inner relay of the branch breaker is opened so as to cut a load circuit of the breaker, and the load current is shut off to the set value or less so as to prevent the all interruption of service with the minimum damage. When the load current becomes 70% or less of the set value, the inner relay of the branch breaker is closed so as to close the load circuit. Load current of the other line of the main breaker is similarly detected by the current detecting current transformer 10. |
