... circuit breaker ,5SM1 residual current circuit breaker ,Siemens type(ELCB,RCCB,RCD) Like Siemens Circuit Breaker, Residual current circuit breaker,RCCB,ELCB,RCD,RCBO,MCB,DPNLE ... function.c. When using it, should choose the right current, if not, the product havenot overload current and short circuit protection functions