The Siemens 5SV4444-0LA01 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON family, rated 40 A at 100 mA sensitivity, Type AC, with short-time delay and built-in thermal overload protection. It snaps onto a DIN rail (REG) and fits a 60 mm grid spacing, occupying 4 modular width units. The 10 kA short-circuit current rating (SCCR) per IEC 61008-1 means it can safely interrupt a fault up to that level without upstream damage — important for coordination in a distribution board.
This RCCB mounts in any position on a standard DIN rail (REG), with a 70 mm installation depth and 72 mm width (4 MW). The top or bottom supply feed gives flexibility in panel layout. IP20 rating applies once the distribution board is installed with conductors connected — standard for enclosed panel gear. The short-time delay feature (switching function short-term delayed) prevents nuisance tripping from transient leakage currents, which is useful on circuits with motor drives or switching power supplies that generate brief inrush leakage.
Operating temperature range is -25 °C to 45 °C, with storage down to -40 °C. The 230/400 V AC supply voltage at 50/60 Hz covers standard European and many international panel voltages. Silicon-free construction is noted for environments sensitive to silicone outgassing. Mechanical service life is rated at 10 000 operating cycles typical.