The Siemens 5SU1324-7FA20 is a 2-pole RCBO from the SENTRON series, combining overcurrent protection (C-curve, 20 A rated at 30 °C) with a 30 mA residual-current device, Type A. Rated frequency is 50 Hz, so it's built for standard European utility grids.
Derating and mounting
The 20 A rating holds at 30 °C; at 40 °C it derates to 18.8 A, and at 50 °C to 17.4 A. The IP20 rating applies once the distribution board is installed with connected conductors — bare terminals are not touch-safe until the board is closed.