Siemens 5SV5344-6KL is a SENTRON 5SV5-series RCCB — 4-pole, Type A, rated 40 A at 400 V AC, with a 30 mA trip threshold and instantaneous response.
Rated at 40 A continuous, this RCCB covers 40 A feeder circuits and downstream sub-distribution — typical for a main building supply or a large commercial kitchen/workshop submain. The I²t let-through is 58 000 A²·s — that's the energy the device passes before clearing, used for coordination studies with upstream MCBs or fuses.
IP20 rated with conductors connected — suitable for enclosed distribution boards only, not for wet or dust-laden environments.