The Siemens 3RK1315-6KS71-2AA0 is a SIRIUS direct motor starter designed for full-voltage starting of three-phase induction motors. It's a self-contained unit with the contactor and overload protection integrated into an IP65 enclosure, rated for on-site operation without a separate panel. It handles a 0.75 kW motor at 400 V AC, 750 W at 500 V, and 0.7 hp at 460/480 V. Communication is over AS-Interface, not PROFIBUS or PROFINET, so this starter is meant for a simple bit-level fieldbus network. It provides 4 digital inputs and 1 digital output for local feedback or control signals.
The enclosure measures 159 mm deep, 294 mm wide, and 215 mm high. Mounting is by screw fixing, and the unit can be installed vertically, horizontally, or flat, though horizontal is the recommended orientation for thermal performance. The main circuit connects via a HAN Q4/2 plug conforming to ISO 23570, so the panel builder needs the mating connector. Device addressing is through an M12 plug, and the control supply is 24 V DC, with a permissible range of 20.4 to 28.8 V DC.
During operation, the starter survives -25 to +55 °C ambient. Storage and transport tolerances extend to -40 to +70 °C. Vibration resistance is 7 mm at 2g, and shock resistance is 12g for 11 ms — robust enough for conveyor lines and pump skids, but not for direct mounting on a large reciprocating compressor without isolation. The on-delay is 25 ms, off-delay 35 ms — fast enough for most sequencing but not for safety-rated instant-off applications.