The Siemens 5SV5642-0 is a SENTRON 4-pole residual current circuit breaker (RCCB), Type AC, rated 25 A with 300 mA sensitivity at 400 V AC. It's an instantaneous-trip device — no intentional delay — designed for fast disconnection on sinusoidal AC earth faults. The 6 kA short-circuit current rating (SCCR) means this RCCB can safely interrupt a fault up to 6 kA without welding its contacts or failing catastrophically — important for coordination with an upstream MCB or fuse that clears higher faults. Snaps onto a DIN rail (REG) and occupies 4 modular width units at 60 mm grid spacing. The 70 mm installation depth matches standard distribution board cutouts. Mounting position is unrestricted — any orientation works.
Rated for 50 Hz only — not suitable for 60 Hz installations. The supply voltage is 230/400 V AC, typical for three-phase four-wire systems in IEC markets. Top or bottom feed is acceptable. IP20 protection applies when installed in a distribution board with conductors connected — the enclosure itself provides finger protection, but the unit is not rated for wet or dusty environments. Operating temperature range is -25 °C to 45 °C; storage range extends to -40 °C to 75 °C. The wider storage limits cover handling and logistics, not running conditions. Mechanical service life is 2,000 operating cycles typical.