What this part is and where it lands
The Siemens 3RK1322-1GS02-0AA4 is an AS-Interface compact direct starter — a self-contained motor start-and-protect unit for a single three-phase load up to 2.2 kW at 400 V AC-3 duty. It's built for distributed motor control right out on the machine frame, not tucked back in a central panel. The IP65 enclosure means this thing takes washdown and dust; you mount it near the motor, run the power and AS-i bus cable to it, and you're done with the motor branch. The bimetal overload relay is set for 4.5 to 6.3 A full-load current, and the short-circuit protection is handled by upstream circuit-breakers coordinated to a 50 kA breaking capacity at 400 V. It talks on the AS-Interface protocol (no PROFIBUS DP onboard), so it fits into an AS-i network as a slave. The integrated brake output — rated for 500 V DC at 1 A — handles a motor holding brake directly, no separate contactor needed. Two integrated inputs let you bring limit switches or pushbuttons back to the AS-i bus without extra I/O modules. The power connection uses tab terminals on the 9-pole motor outgoing feeder and 9-pole power connection, so wiring is plug-and-crimp rather than screw-terminal.
What the ratings mean for fit
The 2.2 kW AC-3 rating at 400 V is the motor power this starter can switch — that's a standard 3 HP motor in North American terms, or a 3 kW frame in IEC land. The setting range of 4.5 to 6.3 A means the bimetal overload is adjustable across that window; if your motor's full-load amps fall outside it, you need a different starter. The 50 kA SCCR at 400 V tells you the upstream protection (circuit-breaker or fuse) must be coordinated so that under a fault this starter can survive a 50 kA prospective short-circuit current without blowing itself apart. That's a high fault-current rating — typical for industrial plants with large transformers feeding the distribution. The IP65 rating means the housing is dust-tight and protected against low-pressure water jets from any direction. You can mount this on a conveyor frame in a food plant washdown zone or on a packaging line that gets hosed down. The ambient temperature range of -25 to +55 °C covers most factory floor conditions but watch the upper end if it's near an oven or in a sun-baked roof space. The brake contact is rated 500 V DC at 1 A — enough for most small motor brakes up to about 10 Nm holding torque.
Integration and wiring notes
The dimensions are 270 mm high, 120 mm wide, 190 mm deep — it's a tall, narrow box meant for machine-mounting, not DIN-rail in a panel. The tab terminals on the main circuit take fast-on connectors; the AS-i bus connection uses the standard yellow flat cable piercing technique. The 9-pole motor outgoing feeder and 9-pole power connection are both tab-terminal patterns, so wiring harnesses can be pre-made. The two integrated inputs are for 24 V DC sensors or pushbuttons, wired back to the AS-i slave electronics inside the housing. The brake output is a separate pair of terminals — verify polarity if the brake uses a free-wheel diode.