The Siemens 3RK1322-1JS02-0AA3 is an AS-interface compact direct starter in the SIRIUS family, designed as a self-contained motor control unit for distributed automation. It integrates an electromechanical DOL starter, bimetal overload protection, and bus communication into a single IP65 enclosure — no separate contactor, overload relay, or control cabinet needed at the point of use. Rated for 4 kW at AC-3 duty on 400 V three-phase, with a setting range of 7…10 A on the bimetal overload. The 50 kA short-circuit breaking capacity (Icu at 400 V) means it can interrupt fault currents up to that level without upstream fuses or breakers needing to clear the fault — a real advantage for panel selectivity and SCCR compliance.
Deployment context
IP65 rating means the unit is sealed against dust ingress and low-pressure water jets — it mounts directly on the machine frame or conveyor section, not inside a control cabinet. The 9-pole motor outgoing feeder and 9-pole power connection simplify wiring: one cable from the AS-i bus and 24 VDC supply, one cable to the motor, and the starter handles the rest. Two integrated inputs on the unit accept local sensors (e.g., position switches or emergency-stop buttons) without an extra I/O module. The built-in motor brake output (400 V AC) controls a holding brake directly, which is common for vertical-axis or palletizing applications where the load must not drift when power is removed.