The Siemens 5SM3416-8 is a SENTRON 5SM3 selective residual-current circuit breaker (RCCB), rated 63 A at 40 °C ambient on a 230 V AC 50 Hz supply. Selective design means it coordinates with downstream RCCBs: the 5SM3416-8 holds through transient earth-leakage pulses up to 5 kA surge-current resistance, letting the closer device trip first on a real fault. Mounts on a DIN rail (REG), any position, occupying 2.5 width units (36 mm wide, 90 mm tall, 70 mm deep).
Current derating and ambient limits
Full 63 A is maintained up to 45 °C. Above that, the rating steps down: 60.48 A at 50 °C, 57.96 A at 55 °C, 55.44 A at 60 °C, 52.92 A at 65 °C, and 50.4 A at 70 °C. The operating ambient range is −25 to +45 °C; storage and transport span −40 to +75 °C.