What This Part Is
The Siemens 3RK1325-6LS71-1AA3 is a SIRIUS reversing motor starter — a self-contained unit combining a contactor, overload relay, and reversing interlock in one IP65 enclosure. It's designed for direct-on-line reversing of three-phase motors up to 5.5 kW at 400 V, with a 24 VDC control supply. The IP65 rating means the housing and the M12 AS-Interface connection are protected against dust ingress and low-pressure water jets — suited for washdown zones or outdoor installation on conveyors, pumps, or material-handling equipment.
Key Ratings and What They Mean for Fit
Rated at 5.5 kW at 400 V, this starter handles a standard 7.5 hp motor at 460/480 V. The trip class is selectable between CLASS 5, 10, 15, and 20, so you're not locked into one thermal curve — match it to the motor's starting profile (short acceleration for conveyors, longer ramp for high-inertia fans). Communication is via AS-Interface (not PROFIBUS or PROFINET), addressed through the M12 plug. The four digital inputs are available for local pushbuttons or limit switches, but there's no on-site operator panel — all control is remote over the AS-i bus or hardwired inputs. Mounting is screw-fix (no DIN-rail clip), with approved positions vertical, horizontal, or flat. The 294 mm width and 159 mm depth are the panel cut-out constraints — verify your enclosure backplate has the clearance before committing the BOM line.
Integration Notes
The main power circuit connects via a HAN Q4/2 plug per ISO 23570 — pre-wire the mating half on the panel side for a quick swap without opening the enclosure. The AS-Interface bus cable enters through the M12 connector; set the node address at commissioning via the bus master, not on the device itself. Environmental limits: operate between -25 °C and +55 °C, store or transport from -40 °C to +70 °C. Vibration resistance is 2g at 7 mm amplitude; shock tested to 12g for 11 ms. These are the bounds for conveyor-line or machine-tool mounting — not a concern for stationary panel installs.