What this reversing starter is and what it does
The Siemens SIRIUS 3RK1315-6NS71-1AA3 is a reversing motor starter designed to control the direction of a three-phase motor — forward and reverse — in a single enclosure. It's rated 4 kW at 400 V with a CLASS 10 trip curve, meaning it protects standard induction motors from overload while allowing them to start without nuisance tripping. The IP65 rating means the housing and all connections are sealed against dust and low-pressure water jets, so this unit lives directly on the machine frame or in a washdown zone, not tucked away in a clean control cabinet. Power supply is 24 V DC nominal (20.4 to 28.8 V range), and the control interface is AS-Interface — the unit addresses via an M12 plug. The main current circuit connects through a HAN Q4/2 connector per ISO 23570, so you're looking at a pre-wired, plug-and-play device for the motor leads. Four digital inputs are on board for limit switches, emergency stops, or sensor feedback.
Panel and machine integration
Mounting is screw fixing, and the unit can be installed vertically, horizontally, or flat — so you have flexibility for tight machine frames. The footprint is 294 mm wide, 215 mm high, and 159 mm deep. That's a substantial block; plan your gland plate and cable entry accordingly. Vibration resistance is 2g at 7 mm amplitude, and shock resistance is 12g for 11 ms — it'll hold up on a packaging machine or conveyor drive end. Operating temperature range is -25 to +55 °C, storage and transport go from -40 to +70 °C. Degree of pollution 3 means it's rated for conductive pollution environments — typical for industrial floors with dust and humidity.