The Siemens 5SV3347-6 is a SENTRON residual current operated circuit breaker (RCCB) — a 4-pole, type A device rated 80 A with a 30 mA trip threshold on a 400 V AC, 50 Hz supply. Type A means it detects sinusoidal AC residual currents plus pulsed DC fault currents up to 1 kHz, which covers most single-phase rectified loads like switching power supplies and variable-speed drives.
The IP20 rating applies once the distribution board is installed with conductors connected, so it's a panel-interior device, not for exposed outdoor use.
Rated short-circuit current withstand is 10 kA per IEC 61008-1 (0.8 kA rated conditional short-circuit current). The maximum permissible series fuse short-circuit current is 100 A — size the upstream protective device accordingly.