The Siemens 5SU1654-7KK16 is a SENTRON RCBO — a combined residual-current and overcurrent protection device — in a 1P+N, 2-pole design. It occupies 2 modular width units (36 mm) on the DIN rail and is rated for 230/240 V AC at 50 Hz.
Above that, the device derates: 15.2 A at 40 °C, 14.4 A at 50 °C, 13.6 A at 60 °C, and 12.32 A at 70 °C. For a panel running at 50 °C, the usable continuous current is 14.4 A — not the 16 A on the nameplate. Factor this into the load schedule.
Power supply can enter from either top or bottom. IP20 applies once the distribution board is installed with conductors connected.