The Siemens 3RT1034-3AP06 is a SIRIUS S2 power contactor — a 3-pole, screw-type terminal unit sized for motor loads on 400 V three-phase systems. Rated operational frequency at AC-3 hits 1 000 switching cycles per hour, so it handles a fast-pick line without derating. The S2 frame size (75 mm wide, 112 mm tall, 115 mm deep) is the mid-range in the SIRIUS contactor family.
Main circuit terminals accept solid conductors 2x (0.25... 2.5 mm²) and stranded 2x (0.75... 25 mm²). The larger stranded range means you can land a 16 mm² supply cable on the line side without a ferrule adapter. Pollution degree 3 rating tells you it's built for the conductive-dust environment inside an industrial enclosure — not a clean-room part.