It carries a 37 kW rating at 400 V in AC-3 duty — the standard category for starting and stopping squirrel-cage motors — and 21.1 kW at 690 V. For the more demanding AC-4 duty (plugging, inching, reversing), it is rated 66 A at 400 V.
If your circuit calls for AC-4, the 66 A limit is the one to check against your motor's locked-rotor current. The contactor also carries a mechanical life of 10 million operations typical, which is standard for this frame size in conveyor, pump, and fan duty.
Solid wire sizes range from 2x (0.5 to 1.5 mm²) up to max 2x (0.75 to 4 mm²) for the control circuit; the main power terminals take stranded wire from 2x (10 to 50 mm²) or solid/stranded 2x (2.5 to 16 mm²). Side-by-side mounting is permitted, which saves rail space when grouping multiple contactors.