The Siemens 5SL6150-7MB is a SENTRON miniature circuit breaker (MCB) rated 50 A with a C-curve trip characteristic, one pole, and a 6 kA breaking capacity per EN 60898 at 400 V AC.
Fit and footprint
Rated IP20 with conductors connected, so it belongs inside an enclosed distribution board, not exposed to washdown.
The 6 kA figure also holds per IEC 60947-2 for industrial applications, so it coordinates downstream of a larger upstream breaker or fuse. Single-pole switching at 250 V AC phase-to-neutral or 440 V AC phase-to-phase (multi-phase operation). DC rated up to 72 V maximum, though this is an AC-optimised device.