The Siemens SENTRON 5SU1344-1RC32 is a 4-pole RCBO — residual current circuit breaker with integral overcurrent protection — rated 32 A with a C tripping characteristic and Type AC 30 mA residual current sensitivity. It occupies 7 modular width units (126 mm) on the DIN rail and is designed for 50 Hz AC systems at 415 V rated voltage.
Breaking capacity and selectivity
Rated breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2. That 15 kA figure under the industrial standard means this unit can interrupt higher prospective fault currents than its domestic rating suggests — useful for sub-distribution boards fed by a transformer with low impedance. The C characteristic (5–10× In magnetic trip) handles motor inrush and transformer energization without nuisance tripping on moderate starts.
Mounting and integration
Snap-on mounting to 35 mm DIN rail; supply can enter from top or bottom. The 70 mm installation depth matches standard SENTRON distribution board cutouts. IP20 with conductors connected — intended for enclosed distribution boards where the front panel provides the environmental seal. Overvoltage category III and pollution degree 2 suit fixed-installation mains connection within a building.