The Siemens 3RK1322-0DS02-0AA4 is an AS-interface compact starter — a direct-on-line (DOL) motor starter in an IP65-rated enclosure, designed for decentralized motor control in washdown or dusty environments. It integrates the contactor, overload relay (bimetal), short-circuit protection (circuit-breaker coordination), and bus communication into a single housing, so you run a single AS-i cable to the machine rather than pulling individual control wires back to a panel. Rated for 0.09 kW at AC-3 duty (400 V) with a setting range of 0.22 to 0.32 A, it handles small motors — fans, small conveyors, indexing tables — where the full-load current falls within that band. The 50 kA breaking capacity at 400 V means it safely clears a short-circuit fault up to that level without upstream devices needing to trip, which simplifies selectivity coordination in a distributed line.
Integration and mounting
IP65 lets you mount this starter directly on the machine frame or on a bracket near the motor — no separate enclosure needed. The 9-pole motor outgoing feeder and 9-pole power connection are tab terminals; you land the motor cable and the AS-i drop at the unit. Two integrated inputs (e.g., limit switches or pushbuttons) can be wired locally, reducing the I/O count on the AS-i master. The built-in motor brake output (500 V DC / 1 A) handles a small holding brake directly, saving an external brake rectifier or relay for applications like vertical-axis stops or pallet stops. Dimensions are 120 mm wide, 190 mm deep, 270 mm tall — a compact footprint that fits in the space a typical junction box would occupy.