The Siemens 3RK1322-0FS02-0AA0 is an AS-i compact direct starter — a self-contained motor starting and protection unit that combines an electromechanical contactor, bimetal overload relay, and short-circuit protection (via circuit-breakers) in a single IP65 enclosure. It's designed for distributed motor control in washdown or outdoor environments, communicating over the AS-interface bus to a higher-level controller. Rated for 0.12 kW at AC-3 duty on a 400 V supply, with a motor current setting range of 0.35 to 0.5 A, this starter handles small induction motors — think conveyors, pumps, or agitators in food-and-beverage or material-handling lines.
If your motor plate shows a higher kW or a different duty cycle (AC-4 for reversing or plugging), this starter won't hold — the bimetal overload and contactor are sized for this specific load window. The setting range of 0.35 to 0.5 A matches the full-load current of a small three-phase motor at 400 V. The bimetal overload provides Class 10 or 20 thermal protection (typical for this design), so it tracks motor heating during start and running. Set the dial to the motor's nameplate FLA within that window. AS-interface protocol support means this starter connects directly to an AS-i network — no separate gateway or I/O block needed for start/stop commands and feedback. The two integrated inputs can take limit switches or proximity sensors, reducing field wiring to a single AS-i cable drop. The 9-pole design carries the motor leads plus brake or encoder wiring if needed (though this variant omits the brake output).
The 190 mm depth, 120 mm width, and 270 mm height fit the standard footprint for this family.