The Siemens SENTRON 5SU1324-6FR25 is a 2-pole RCBO — a combined overcurrent and residual-current device — rated 25 A at 30 °C, with a 30 mA Type A residual trip and B-curve overcurrent characteristic.
At 40 °C it drops to 24 A, at 50 °C to 23 A, and at 60 °C to 22 A. If the panel runs warm — say a packed enclosure near a drive — use the 40 °C or 50 °C figure for your load calculation, not the 25 A headline.
Mounting position any, supply feed top or bottom. The IP20 rating applies only when the distribution board is installed with conductors connected — so it's not a standalone outdoor device. Touch protection is built in.
