What this SIRIUS reversing starter is
The Siemens SIRIUS 3RK1325-6LS71-1AA5 is a reversing motor starter in an IP65-rated enclosure, designed for direct-on-line reversing of three-phase motors up to 5.5 kW at 400 V. It communicates via AS-Interface and carries four digital inputs, so it can take local start/stop and direction commands without a separate I/O block. The trip class is field-selectable among CLASS 5, 10, 15, and 20, which means you match the overload release to the motor's starting characteristic — fast for short acceleration, slow for high-inertia loads like fans or conveyors.
This unit measures 294 mm wide by 215 mm high by 159 mm deep and mounts via screw fixing in any orientation — vertical, horizontal, or flat. The main power circuit connects through a HAN Q4/2 plug (ISO 23570), while device addressing uses an M12 plug — both are panel-friendly, pre-wired connectors that speed cabinet assembly.
Electrical ratings and environment
Supply voltage is 24 V DC nominal, with a permissible range of 20.4 to 28.8 V DC and an absolute maximum of 31.6 V. Motor power ratings: 5.5 kW at 400 V, 5 500 W at 500 V, 3 hp at 220/230 V, and 7.5 hp at 460/480 V — covering common global line voltages. It handles shock at 12g for 11 ms and vibration at 7 mm / 2g, so it survives on a machine tool or conveyor line.
Because it's an active SIRIUS catalog item, lead time is the standard Siemens factory build cycle; we quote firm dates per your required quantity.