Siemens 5SV3644-6KL Residual Current Circuit Breaker (RCCB). Residual current operated circuit breaker, 4-pole, type A, In: 40 A, 300 mA, Un AC: 400 V, N left. It belongs to RCCBs. Recorded manufacturer technical characteristics include Poles: 4P; RCD type: A; Rated current: 4 A; Voltage rating: AC 400 V; Residual current: 300 mA.