The Siemens 5SV3642-3 is a SENTRON residual current operated circuit breaker (RCCB), 4-pole, type F, short-time delayed, rated 25 A with a 300 mA residual trip threshold on a 230/400 V AC supply at 50/60 Hz.
The IP20 rating applies once the distribution board is installed with connected conductors; the housing is silicon-free, which matters in coating or potting environments.
Type F detection handles mixed-frequency residual currents from variable-speed drives and UPS systems — not just the 50 Hz sine wave a Type A catches. The short-time delayed design (0.8 kA per IEC 61008-1) prevents nuisance tripping from transient ground faults common on motor-start or capacitor-switching circuits.