SIRIUS reversing starter — AS-Interface, IP65, Trip Class 10
The Siemens SIRIUS 3RK1315-6LS41-3AA5 is a reversing motor starter rated 5.5 kW at 400 V, with Trip Class 10 overload protection, enclosed to IP65 for washdown environments. It communicates via AS-Interface for control and status, and includes 4 digital inputs for local feedback or auxiliary sensors. The DC supply range is 20.4 to 28.8 V, making it compatible with standard 24 V control systems.
What the ratings mean for fit
Trip Class 10 means the overload relay trips within 10 seconds at 7.2× rated current — standard for general-purpose motor starting where the load accelerates quickly (pumps, fans, conveyors). The IP65 rating means the enclosure withstands hose-directed water and dust ingress, so this unit mounts directly on the machine frame or in a washdown zone without a separate cabinet. The reversing starter design integrates two contactors mechanically interlocked for forward/reverse control of a single motor, saving panel space versus two separate contactors. Screw fixing with a 159 mm depth and 294 mm width means it needs a clear panel area; mounting can be vertical, horizontal, or flat.
Deployment context
The IP65 enclosure and AS-Interface communication make this starter suited for decentralized motor control in food-and-beverage, packaging, or material-handling lines where the drive point is remote from the main control cabinet. The 4 digital inputs allow connection of limit switches, safety interlocks, or position sensors directly at the starter, reducing field wiring back to the PLC. The ON-delay of 85 ms and OFF-delay of 65 ms are fixed — no field adjustment — so timing-critical sequences must account for these built-in delays.