The Siemens 3RK1322-1BS02-0AA4 is an AS-i compact direct starter — a self-contained DOL motor starter in an IP65 enclosure that communicates over the AS-interface bus. It's designed for distributed motor control right at the machine, not back in a central panel. The bimetal overload relay protects the motor, and the integrated brake output handles a DC brake up to 500 V / 1 A, so it suits applications like conveyors or small hoists where a holding brake is needed.
Rated 0.75 kW in AC-3 duty at 400 V — that's the motor-switching current curve, not a resistive load. The setting range of 1.4 to 2 A matches the full-load current of a small three-phase motor in that power band. IP65 enclosure means the housing and the AS-i bus connection are sealed against hose-directed water and dust — suitable for washdown zones or outdoor installation on a machine skid.
Dimensions are 270 mm high, 120 mm wide, 190 mm deep — it's a standalone enclosure, not a DIN-rail module. The main current circuit connects via tab terminals, and the motor outgoing feeder and power connection are both 9-pole. Two integrated inputs are available for local sensors or pushbuttons. The AS-interface protocol handles the bus communication, so no separate PROFIBUS DP connection is needed.