BMXN- 40L series small residual current circuit breaker is suitable for AC 50 Hz / 60 Hz, rated voltage below 230 V single-phase residential lines, to protect electrical lines and equipment overload, short circuit, and as leakage protection. The product has the characteristics of small volume, high breaking capacity, zero live wire cut off at the same time. The current action type of residual current circuit breaker is electronic.