The Siemens SENTRON 5SV4344-0LA is a 4-pole residual current circuit breaker (RCCB) with thermal overload protection, rated for 40 A at 400 V AC, 50 Hz, with a 30 mA trip sensitivity.
The 40 A rated current (In) and 30 mA sensitivity define the load and protection envelope: the RCCB carries up to 40 A of continuous load on its 4 poles, and it disconnects when the residual (earth leakage) current exceeds 30 mA — the threshold for supplementary protection against electric shock in standard IEC 60364 installations. Rated for 400 V AC phase-to-phase (3-phase 4-wire systems), the 4-pole design switches all live conductors including neutral. The 50 Hz operating frequency matches standard European utility grids. Overvoltage category III confirms suitability for fixed-installation distribution boards rather than downstream socket outlets.
Installation depth is 70 mm.