What the Ratings Mean for Fit
The 3RK1325-6LS71-0AA5: The 5.5 kW at 400 V rating tells you this starter handles a standard 3-phase induction motor up to that load — think conveyors, pumps, or small fans. The 7.5 hp at 460/480 V covers North American 480 V supplies. Trip classes 5, 10, 15, and 20 are selectable, meaning you match the thermal overload curve to the motor's start profile: class 10 for short acceleration, class 20 for high-inertia loads like centrifuges. IP65 means the enclosure keeps out dust and low-pressure water jets — fine for food processing or outdoor installation, but not submersion. The AS-Interface protocol ties this directly into a 24 V DC sensor/actuator bus — no separate PROFIBUS or PROFINET gateway needed. The four digital inputs let you wire limit switches or pushbuttons locally without a remote I/O block. Supply voltage tolerance (20.4 to 28.8 V DC) means it rides through dips on a lightly loaded AS-I power supply, but the minimum permissible voltage is 26.5 V — keep the bus supply above that for reliable operation.
Mounting and Integration
Mounting is via screw fixing — no DIN rail clip, so plan for four screws into a backplate. The enclosure can be oriented vertical, horizontal, or flat, but horizontal is recommended for best heat dissipation. The main circuit connects through a HAN Q4/2 plug — a standard industrial connector — so pre-wire the panel harness to that interface. Device addressing uses an M12 plug, typical for AS-Interface nodes. Shock rating of 12g / 11 ms and vibration resistance of 7 mm / 2g mean it holds up on a machine frame, not just a control cabinet.