What this part is and where it fits
The Siemens 3RK1322-0HS02-1AA4 is an AS-i compact reversing starter from the SIRIUS family — a self-contained motor starting and reversing unit rated for 0.55–0.8 A (initial to full-scale) and 0.21 kW at AC-3 duty on a 400 V line. It's an electromechanical reversing starter with bimetal motor protection and circuit-breaker-based short-circuit protection, all housed in an IP65 enclosure that handles washdown environments. The IP65 rating means the enclosure and optics are sealed against dust ingress and low-pressure water jets — suitable for food-and-bev lines, washdown zones, or outdoor conveyor sections where a standard panel-mount starter would need a separate enclosure. Communication is via AS-interface protocol (not PROFIBUS DP), with two integrated inputs and a motor brake output (500 V DC / 1 A) built in. The main current circuit connects through tab terminals, typical for quick field wiring in distributed motor starter applications.
Key ratings and what they mean for your BOM
The 0.55–0.8 A setting range covers small reversing motor loads — think fractional-horsepower conveyors, diverters, or valve actuators. The AC-3 rating at 400 V (0.21 kW) is the motor-switching duty: it's the current the contacts handle during starting and plugging, not the resistive-heating rating. For a 0.21 kW motor at 400 V three-phase, full-load current sits around 0.5–0.6 A, so this starter is sized correctly for that specific motor frame. The short-circuit breaking capacity (Icu) at 400 V is 50 000 A — that's the maximum fault current the unit can safely interrupt without welding contacts or rupturing the enclosure. In a panel with a high-available-fault-current bus (common in industrial distribution), this rating means you don't need an upstream current-limiting fuse to protect the starter itself. Operating temperature range is -25 to +55 °C, which covers most indoor industrial environments and many outdoor installations in temperate climates. The IP65 enclosure also means it can be mounted directly on a machine frame or conveyor structure without a separate panel.
Sourcing and lifecycle reality
For a BOM line that calls out 3RK1322-0HS02-1AA4, the fit is confirmed by the setting range (0.55–0.8 A), the reversing function, the AS-i bus interface, and the IP65 enclosure. The tab-terminal main connections and 9-pole motor/power connectors are specific to this variant — verify the connector pattern matches your existing harness before committing the order.