What this AS-i reversing starter does on the line
The Siemens 3RK1322-1DS02-1AA3 is an AS-Interface compact reversing starter in an IP65 enclosure — meaning it lives directly on the machine frame, not in a central panel. It handles a motor load up to 1.1 kW at 400 V under AC-3 duty (the standard for squirrel-cage induction motors), with a setting range of 2.2 to 3.2 A on the bimetal overload relay. The electromechanical switching contacts reverse the motor direction via the AS-i bus, and the integrated brake output handles the holding brake on vertical-axis or high-inertia loads.
What the ratings mean for fit
The 1.1 kW AC-3 rating at 400 V is the headline number — it tells you this starter is sized for a 1.1 kW motor drawing roughly 2.6 A at full load. The bimetal overload covers 2.2 to 3.2 A, so you set it to the motor nameplate FLA. The 50 kA short-circuit breaking capacity at 400 V (Icu) means the integrated circuit-breaker can safely interrupt a fault up to that level without welding contacts or cascading upstream — critical for coordination studies on a distribution board. IP65 means the housing is dust-tight and protected against low-pressure water jets — suitable for washdown zones in food processing or outdoor conveyor gantries. The operating temperature range of -25 to +55 °C covers most factory-floor conditions, including unheated warehouses in winter.
Bus integration and wiring
This starter communicates over AS-Interface (AS-i), not PROFIBUS DP — so it plugs directly into an AS-i yellow flat cable loop from the master. The main circuit connects via tab terminals (9-pole motor outgoing and 9-pole power connection), which are standard for this form factor. Two integrated digital inputs on the unit let you wire local sensors (e.g., limit switches or emergency-stop buttons) directly into the AS-i node, saving a separate I/O block.