What this AS-Interface compact reversing starter does
The Siemens 3RK1322-1DS02-1AA1 is an AS-Interface compact reversing starter with electromechanical switching contacts and bimetal motor protection, rated AC-3 at 400 V for 1.1 kW motor loads. It carries a setting range of 2.2 to 3.2 A and a maximum short-circuit breaking capacity (Icu) of 50 000 A at 400 V — meaning it can safely clear a bolted fault on a 400 V line without upstream coordination cascading open. Built for IP65-rated environments, the housing withstands washdown and dust ingress directly on the machine frame — no separate control cabinet needed for the motor circuit. It communicates over AS-Interface protocol and includes two integrated inputs plus a motor brake output rated 24 V DC / 3 A for holding brake control on vertical-axis drives. Operating ambient temperature spans -25 to +55 °C, which covers most production-floor conditions including cold stores and non-air-conditioned lines in warm climates.
What the ratings mean for fit
The 50 kA Icu at 400 V is the key coordination number for panel builders and site electrical engineers: it means this starter can be installed downstream of a 50 kA-rated feeder without requiring a current-limiting upstream device, provided the prospective fault current at the point of installation does not exceed that value. The AC-3 duty rating (1.1 kW at 400 V) governs motor starting — the contactor portion is sized for the inrush current of a 3-phase induction motor up to that power, not just the running load. The setting range is 2.2 to 3.2 A on the bimetal overload relay.
Integration notes for the controls integrator
The main current circuit connects via tab terminals. Dimensions are 120 mm wide × 270 mm high × 190 mm deep — a compact footprint for a reversing starter with integrated brake and bus. The IP65 rating means it can be mounted directly on the machine frame or a wall bracket, not inside a cabinet, as long as the tab-terminal connections are suitably protected from contact.