The Siemens SENTRON 5SV4744-0 is a 4-pole residual current circuit breaker (RCCB) rated for 40 A at 50 Hz, tripping on a 500 mA residual current of Type AC. It carries a 10 kA short-circuit current rating (SCCR) per IEC 61008-1, meaning it can safely interrupt fault currents up to that level without upstream coordination issues in a distribution board. The instantaneous design (no short-time delay) clears fast, which keeps let-through energy low — the listed I²t is 58 000 A²·s.
Panel fit and mounting
Snaps onto a DIN rail (REG profile per) and occupies 4 modular width units (72 mm wide, 90 mm tall, 70 mm deep). The IP20 rating applies once the distribution board is installed with conductors connected — standard for enclosed panel use, not for wet or washdown environments. Supply can enter from top or bottom, and mounting position is unrestricted.
Thermal performance across the range
Rated current holds at 40 A from 40 °C all the way up to 70 °C ambient — no derating needed in a warm panel. The operating ambient range is -25 °C to 45 °C, with storage from -40 °C to 75 °C. That storage window covers handling in unheated warehouses; the operating limit is what governs the panel environment.