The Siemens 3RA2225-1KB24-0AP6 is a SIRIUS non-fused reversing motor starter in size S0, built for controlling direction on three-phase motors up to 5.5 kW at 400 V AC-3 duty.
The unit measures 265 mm high, 90 mm wide, and 120 mm deep. Backward clearance is zero — the housing sits flush against the backpanel. The supplied contactor is a 3RT2024-1AP60, and the link module is 3RA2921-1AA00. Main power terminals accept stranded wire from 1 to 10 mm², or two conductors of 2.5 to 6 mm² each. The circuit-breaker section is size S00.
Operating temperature range is -20 to +60 °C; storage from -50 to +80 °C; transport from -55 to +80 °C. Pollution degree 3 (industrial environment with conductive or dry non-conductive pollution). RoHS compliance date is noted as March 1, 2017.