The Siemens 5SQ2160-4CR10 is a 1-pole miniature circuit breaker rated 10A with a B-trip curve, designed for 230/400 VAC systems per IEC 60947-2.
Rated 230/400 V per IEC 60947-2: the breaker clears faults up to the rated short-circuit capacity defined by that standard for its pole count and voltage. The 10 A rating covers branch circuits feeding lighting, control transformers, or small resistive loads. The B-curve avoids nuisance tripping on moderate inrush but will not hold motor-start currents — size up to C or D curve for inductive loads.