The AC-4 rating for reversing or inching duty is 15.5 A at 400 V — a lower continuous current than the AC-3 figure, so factor that in if your application cycles the contactor under load.
Front protection is IP20; the terminals themselves are IP00, so the contactor needs to live inside a cabinet, not out in a washdown zone. Wire sizes for the main circuit accept solid conductors from 2x 0.5 mm² up to 2x 4 mm², or stranded up to 2x 10 mm². For AWG, that's 2x 16–12 or 1x 8. The auxiliary terminals take 2x 0.5–1.5 mm² solid or 2x 0.75–2.5 mm² stranded.
For Type 2 coordination (contactor remains usable after a fault), the fuse drops to gL/gG 35 A. This matters when you're specifying the short-circuit protection for the motor branch circuit. Coil operating range is 0.8–1.1 x Us at 50 Hz and 0.85–1.1 x Us at 60 Hz — standard tolerance for industrial control voltage.