The Siemens 3RK1322-1CS02-1AA3 is an AS-i compact reversing starter in an IP65 enclosure, rated for 0.9 kW at 400 V AC-3 duty with a setting range of 1.8 to 2.5 A. It integrates a bimetal motor protection relay, electromechanical switching contacts, and a motor brake output, all in one field-mounted package that communicates over AS-interface. The IP65 rating means the enclosure and connectors withstand washdown — this starter is designed for direct mounting on conveyors, packaging machines, or material handling sections where running control wiring back to a panel is impractical. The reversing contactor pair handles forward/reverse motor control, and the integrated brake output handles the holding brake on vertical-axis drives.
The AC-3 rating of 0.9 kW at 400 V defines the maximum induction motor load this starter can switch under full-load starting conditions — that covers small conveyors, agitators, and fan drives up to that power. The bimetal overload relay is set via the 1.8 to 2.5 A range, matching the motor FLA. The electromechanical contactor design gives you visual confirmation of state and no leakage current in the off state — unlike a solid-state alternative, this part is a direct replacement for traditional reversing starters, just packaged for distributed mounting.
The enclosure measures 270 mm high by 120 mm wide by 190 mm deep — sized for direct machine mounting via the integrated flanges. Main circuit connections use tab terminals; the AS-i bus connection and the two integrated inputs handle the control and feedback wiring. The 9-pole motor outgoing feeder and 9-pole power connection mean you land the motor cable and supply cable directly on the unit, not through a separate junction box. The AS-interface protocol onboard eliminates a separate bus coupler — the starter appears as a single node on the AS-i network, and the two integrated inputs can read limit switches or sensors directly.