The 3RT1017-1BB44-3MA0: The 24 V DC coil draws 3.3 W on closing and holding, which is a steady-state DC load you can budget in your control transformer sizing. The contactor is rated for AC-2 duty at 5.5 kW at 400 V, and AC-4 at 8.5 A at 400 V — so it handles both starting and plugging/reversing loads on motor circuits up to that power. The screw-type terminals on both main and auxiliary circuits accept 2x (0.5 to 1.5 mm²) solid/stranded, 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²) — or 1x 12 AWG. That covers typical panel wiring without needing ferrules, though ferruled stranded is fine.
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. The S00 frame is compact at 45 mm wide, 57.5 mm tall, and 111 mm deep — fits a standard 45 mm slot in a control panel, and side-by-side mounting is allowed without derating for the thermal current. IP20 on the front and at the terminals means it's protected against finger contact but not washdown — keep it inside the enclosure, not on the machine frame in wet areas. Operating temperature range is -25 to +60 °C, so it handles warm cabinet interiors without forced cooling. Pollution degree 3 (conductive or dry non-conductive pollution) is standard for industrial control panels. The contactor is rated for type 1 coordination with a 35 A gL/gG fuse, and type 2 coordination with a 20 A gL/gG fuse — that's the short-circuit protection you need upstream to keep the contactor serviceable after a fault.
The reference code per IEC 81346-2 is Q (power switching device), which aligns with how it's tagged in panel schematics and BOMs. For compliance documentation, the manufacturer provides RoHS and REACH declarations; UL and IEC certifications are standard for the SIRIUS line but not individually listed in this spec set.