What this part is and where it lands
The Siemens 3RK1322-0HS02-0AA4 is an AS-interface compact direct (DOL) starter — an electromechanical motor starter with bimetal overload protection, all packaged in an IP65-rated enclosure that handles washdown environments on the factory floor. It switches a 0.21 kW motor at AC-3 duty on a 400 V line, with a setting range of 0.55 to 0.8 A. The built-in brake contact handles 500 V DC / 1 A, so it's ready for motors with DC brakes — no separate brake relay needed.
What the ratings mean for fit
The 0.55–0.8 A setting range is narrow — this is sized for a specific small motor, not a general-purpose contactor you'd oversize. At AC-3 0.21 kW / 400 V, it's meant for a fixed-speed motor load like a small conveyor or pump. The 50 kA short-circuit breaking capacity at 400 V means it can ride out a fault upstream without blowing apart — that's a high interrupt rating for a compact starter, so it's safe in high-fault-current panels. The IP65 rating means the whole assembly — enclosure, contacts, bimetal — is protected against hose-directed water and dust ingress, so it mounts directly on the machine frame, not inside a separate control cabinet.
Integration and wiring
Communication runs on AS-interface protocol — not PROFIBUS DP — so it plugs into an AS-i network via the yellow flat cable. The main current circuit connects through tab terminals, which is a fast push-on connection typical for IP65-rated field devices. The 9-pole motor outgoing feeder and 9-pole power connection handle the motor cable and the AS-i power/ data in one connector. Dimensions are 270 mm high, 120 mm wide, 190 mm deep — it's a compact brick, but the depth means you need clearance for the connector plugging in. The two integrated inputs let you wire limit switches or pushbuttons directly into the starter without a separate I/O block.