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.
Mounting and integration
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. IP65 means the enclosure is dust-tight and protected against low-pressure water jets, so it can be mounted directly on the machine frame or in a washdown zone without a separate cabinet.
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. Operating temperature range is -25 to +55 °C, with storage and transport from -40 to +70 °C. It handles shock at 12g for 11 ms and vibration at 7 mm / 2g, so it survives on a machine tool or conveyor line. Pollution degree 3 means it's rated for industrial environments with conductive or dry non-conductive pollution — typical for a factory floor installation.
Lifecycle and sourcing posture
It is sourced to order against an RFQ. 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.