AS-i compact starter for distributed motor control
The Siemens 3RK1322-0FS02-0AA3 is an AS-interface compact direct starter rated for 0.12 kW at AC-3 400 V, with a bimetal overload setting range of 0.35...0.5 A. The electromechanical switching contact and integrated motor brake output (400 V AC) make it a self-contained motor control unit for small induction motors in distributed architectures. The IP65 enclosure means it mounts directly on the machine frame or in a washdown zone without an additional cabinet — the housing and the tab terminals for the main current circuit are sealed against dust and low-pressure water jets.
What the ratings mean for fit
The 0.12 kW at AC-3 400 V rating governs the motor size this starter can handle — per the datasheet, that corresponds to a small three-phase motor (roughly 0.16 hp). The setting range of 0.35...0.5 A on the bimetal overload relay is the actual trip threshold; you set it to the motor's full-load current within that window. The 50 kA short-circuit breaking capacity (Icu) at 400 V tells you the unit can safely interrupt a fault up to that level without upstream fuses blowing, provided the downstream circuit-breaker coordination is correct per the manufacturer's assignment table.
Fieldbus integration and I/O
This starter communicates via AS-interface protocol (no PROFIBUS DP). It includes two integrated inputs for local sensors (e.g., limit switches or emergency-stop buttons) and the bus communication function allows parameterization and diagnostics over the AS-i network. The equipment marking per DIN EN 61346-2 (Q) identifies it as a motor starter in the schematic. The 9-pole motor outgoing feeder and 9-pole power connection are pre-wired via the tab terminals — you connect the AS-i flat cable and the motor cable, then commission the address via the master.