SIRIUS direct starter with AS-Interface and IP65 enclosure
The Siemens SIRIUS 3RK1325-6LS71-0AA0 is a fully enclosed direct starter rated for 5.5 kW at 400 V, with selectable Trip Classes 5, 10, 15, and 20. The IP65 rating means the housing and all connections tolerate washdown environments — food, beverage, or any line where a hose-down schedule is part of the shift. It communicates over AS-Interface (the onboard protocol), so you skip the separate fieldbus coupler if your backbone is AS-i. Supply is 24 V DC nominal, with a working range of 20.4 to 28.8 V.
What the ratings mean for fit
The 5.5 kW at 400 V rating (7.5 hp at 460/480 V) covers most small conveyors, pumps, and fan starters in a typical 480 V plant. Trip Class selection — 5, 10, 15, or 20 — lets you match the overload curve to the motor's thermal capacity; a high-efficiency motor with a short locked-rotor time needs Class 10 or 5, while a general-purpose T-frame can take Class 20. The 25 ms ON-delay and 35 ms OFF-delay are fixed, so sequencing logic stays simple — no programmable timers inside this box. Four digital inputs are available for local pushbuttons or sensor feedback, addressed through the M12 plug. The main circuit connects via a HAN Q4/2 connector (ISO 23570), which is a standard industrial interface — panel builders will recognize the form factor. Mounting is screw-fix to a backplate; the unit can sit vertical, horizontal, or flat, though horizontal is recommended for thermal performance.
Environmental and mechanical notes
Operating temperature range is -25 to +55 °C, with storage and transport down to -40 °C. Shock resistance is 12 g for 11 ms; vibration resistance is 7 mm at 2 g. Pollution degree 3 means it is rated for industrial environments with conductive pollution — no clean-room restrictions. Dimensions: 294 mm wide, 215 mm high, 159 mm deep.