The Siemens 5SJ4132-7HG42 is a SENTRON 5SJ4 miniature circuit breaker — single-pole, C-curve, rated 10 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC. That 15 kA IEC rating gives you headroom for higher-fault panels where a standard 10 kA unit would need an upstream current-limiting fuse.
Rated insulation voltage (Ui) is 440 V AC, so it's comfortable on 400 V line-to-line systems.
Mounting and wiring notes
Combined terminals top and bottom — no tunnel terminals, so you're using cage-clamp or screw-clamp with the supplied hardware. Torque to 3.5 Nm. The supply can feed from either end; position doesn't matter. IP20 with conductors connected, IP40 in the handle area — fine for enclosed panels, not for washdown zones.