Siemens 5su1656 series ground fault circuit 1 pole n tripping characteristic b siemens 5su1656 6kk10 p the siemens 5su1656 6kk10 is a residual current operated circuit breaker rccb of characteristic type b this 10a circuit breaker is suitable for use in three phase current systems before input circuits with rectifiers p p with type b the tripping characteristic is adapted to suit the increase of leakage currents at higher frequencies in systems with capacitive impedances thus ensu