The Siemens SENTRON 5SV4417-0 is a 2-pole residual current circuit breaker (RCCB) rated 80 A at 50 Hz, with a 100 mA trip threshold and instantaneous response (Type AC). It interrupts fault currents up to 10 kA (per IEC 61008-1), so it clears a ground fault before upstream overcurrent devices operate — selectivity holds as long as the upstream device's let-through stays above that threshold. The 100 mA rating suits circuits where a 30 mA trip would cause nuisance tripping from leakage in longer runs or equipment with inherent capacitance.
Snaps onto standard 35 mm DIN rail (DIN 43880, 2 modular-width units). Supply feeds top or bottom — no orientation restriction. The IP20 rating applies when installed in a distribution board with conductors connected; it is not a standalone enclosure rating, so the RCCB lives inside a panel or cabinet that provides the physical protection.
Derate the 80 A rating above 40 °C: at 45 °C it carries 77.87 A, at 55 °C 70.26 A, at 65 °C 56.96 A, and at 70 °C 48.2 A. The silicon-free construction (no silicone outgassing) avoids contamination in sensitive environments like paint shops or electronics assembly. Storage range extends from -40 °C to 75 °C, wider than the -25 °C to 45 °C operating range — that extra span covers transport and warehouse, not running conditions.