Rated insulation voltage is 690 V, and the AC-3 maximum operating voltage is also 690 V — this contactor handles standard 400 V motor circuits with headroom for 690 V line-to-line systems. Motor power at 60 °C ambient is 6 kW at 230 V, 10.5 kW at 400 V, and 18 kW at 690 V; these are the derated figures you use for sizing in warm enclosures. The coil holds at 24 VDC nominal; the 6 A rating is the inrush, not the holding current.
Width is 45 mm, depth 73 mm, height 57.5 mm — fits standard 45 mm-wide contactor slots. Screw terminals on the main circuit accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded conductors. Minimum conductor size at 40 °C and 60 °C is 2.5 mm².