What it is and where it fits
The Siemens 3RK1322-1KS02-0AA3 is an AS-interface compact direct starter — a self-contained motor start-and-protect package for a single three-phase motor up to 5.5 kW at 400 V AC-3 duty. It's an electromechanical DOL (direct-on-line) starter with bimetal overload protection, designed to mount directly on the machine frame or inside a junction box, not inside a central control panel. The IP65 enclosure means it handles washdown and dusty environments on the plant floor. Rated for 5.5 kW at 400 V AC-3, the motor-switching current setting range is 9…12 A via the bimetal relay. The 50 kA short-circuit breaking capacity at 400 V means it can interrupt a fault up to that level without upstream devices needing to clear it — useful for high-fault installations.
AS-Interface and connectivity
This starter communicates over AS-Interface (AS-i protocol), not PROFIBUS DP. It includes bus communication capability and two integrated inputs for local sensors or pushbuttons. The main circuit connects via tab terminals — expect a 9-pole motor outgoing feeder and a 9-pole power connection, per the description. A motor brake output is built in, rated for 400 V AC, so you can control a mechanical brake directly from the starter without an external contactor. That's one less component to mount and wire.
Lifecycle and sourcing reality
Operating temperature range is -25 to +55 °C, which covers most indoor industrial environments and many outdoor enclosures in temperate climates. Dimensions are 270 mm high, 120 mm wide, 190 mm deep — a compact footprint for a 5.5 kW starter with integrated bus and brake control.