The Siemens SIRIUS 3RK1325-6LS41-3AA0 is a reversing motor starter — a single enclosure that handles forward/reverse control for three-phase motors up to 5.5 kW at 400 V. It's built for washdown environments with an IP65 rating, so it can sit right on the machine frame without a separate control cabinet.
What the ratings mean for fit
The 5.5 kW rating at 400 V is the motor power it can switch under AC-3 duty (starting/running squirrel-cage motors). At 500 V it's also rated 5.5 kW, and at 575/600 V it handles up to 10 hp — so it covers common North American and European voltage bands without derating surprises. The trip class is field-selectable among CLASS 5, 10, 15, and 20, which means you match the thermal overload curve to the motor's startup time: fast for low-inertia fans, slower for high-inertia loads like centrifuges. It communicates over AS-Interface (the flat two-wire fieldbus), so if your line already uses AS-i for sensors and actuators, this starter integrates without a gateway. The four digital inputs onboard handle local start/stop or feedback, and addressing is done through an M12 plug — no DIP switches to mis-set. The IP65 enclosure means the unit survives high-pressure washdown — food, beverage, or chemical processing lines where you hose down the equipment daily. Mount it horizontally, vertically, or flat; it's rated for shock at 12g/11 ms and vibration at 2g/7 mm, so it holds up on a vibrating conveyor frame.