What this SIRIUS direct starter integrates
The 3RK1325-6LS41-0AA0 is a SIRIUS direct starter with onboard remote I/O — it combines motor starting, overload protection, and fieldbus connectivity in one IP65 enclosure. Rated 5.5 kW at 400 V and 5.5 kW at 500 V, it also carries horsepower ratings of 3 hp at 220/230 V, 7.5 hp at 460/480 V, and 10 hp at 575/600 V — covering common motor voltages across North American and IEC installations. The overload relay is adjustable across trip classes 5, 10, 15, and 20, so you match the thermal curve to the motor start profile — fast starts on low-inertia loads or slower starts on high-inertia fans and conveyors.
Environmental and mounting constraints
Enclosure is IP65, rated for washdown environments — the unit withstands dust ingress and low-pressure water jets from any direction, suitable for food-and-bev or pharmaceutical lines where hose-down is routine. Operating temperature range is -25 to +55 °C, with storage and transport limits of -40 to +70 °C — the wider storage envelope matters for spares held in unheated warehouses. Vibration resistance is 7 mm / 2g and shock resistance is 12g / 11 ms, per the evidence — this is not a high-vibration-rated unit for direct machine mounting; plan for panel or stanchion mounting with vibration damping if the starter is near a reciprocating compressor or press. Mounting is by screw fixing — no DIN-rail clip on this form factor. The unit can be installed in vertical, horizontal, or flat orientation, though horizontal is recommended for optimal thermal convection through the IP65 housing.
I/O and fieldbus connectivity
Four digital inputs are onboard — these can be used for start/stop, reset, or status feedback directly at the starter, reducing the need for a separate remote I/O drop. Communication is via AS-Interface (AS-i) protocol — the unit is addressed through an M12 plug, which is the standard AS-i device connection. No PROFIBUS or PROFINET on this variant. The main circuit connection uses a plug according to ISO 23570, HAN Q4/2 — this is a heavy-duty industrial connector rated for the motor current, not a terminal block. The control supply is 24 V DC, with a permissible range of 20.4 to 28.8 V DC and a maximum of 31.6 V DC.
Lifecycle and sourcing posture
No stock-holding claim is made — request an RFQ for your quantity and delivery window.