The Siemens 5SU9326-1CR10 is a SENTRON RCBO — a residual-current-operated circuit breaker that combines overcurrent protection (C-curve) and 30 mA earth-leakage protection in a single 2-pole unit, rated 10 A at 230/240 V AC, 50/60 Hz.
Occupies 4 modular width units (72 mm wide) on a DIN rail, with a depth of 77 mm and an installation depth of 70 mm — check your enclosure depth before committing; some shallow 4-module enclosures may need the 70 mm clearance. Supply can enter from either top or bottom, and the neutral conductor is switched internally (2-pole protection).