Siemens 5SV3621-4 Residual Current Circuit Breaker. residual current operated circuit breaker, 2-pole, type B, short-time-delayed, In: 16 A, 300 mA, Un AC: 230 V SIGRES: harsh environmental conditions extended test interval. It belongs to RCCBs. Recorded manufacturer technical characteristics include Poles: 2P; RCD type: B; Rated current: 16 A; Voltage rating: AC 230 V SIGRES: harsh environmental conditions extended test interval; Residual current: 300 mA.