What it is and what it does
The Siemens 3RK1325-6LS71-1AA0 is a SIRIUS reversing motor starter in an IP65 enclosure, designed for direct-on-line reversing of three-phase motors up to 5.5 kW at 400 V (7.5 hp at 460/480 V, 3 hp at 220/230 V). It integrates a contactor, overload relay, and reversing interlock into one package, saving panel space and wiring time on reversing applications like conveyors, hoists, and door drives.
Where it's used
This class of reversing starter is specified for motor loads that must run in both directions — conveyor belts, transfer stations, hoists, gate operators, and mixing vessels. The integrated reversing interlock prevents both contactors from closing simultaneously, which is a safety requirement per IEC 60947-4-1. The IP65 enclosure allows mounting directly on the machine frame rather than in a central panel, reducing field wiring runs.