It's rated for 15.5 A in AC-4 duty at 400 V — that's the category for reversing, plugging, and inching motors where the contacts make and break under full locked-rotor current. The 24 VDC coil holds in at 18 V and drops out below that, so it plays nice with standard 24 VDC control supplies.
Side-by-side mounting is allowed with a 6 mm gap at the side for heat dissipation. The screw terminals accept up to 2x 4 mm² solid or 2x 10 mm² stranded on the main circuit — that's enough for the 7.5 kW motor load at AC-2 or the 11 kW at 690 V. The front is IP20, the terminals themselves are IP00, so it's a panel-mount part, not a standalone enclosure device. It'll live inside a cabinet with the rest of the SIRIUS gear.
For type 1 coordination (contactor can be damaged but no fire or shock hazard), you can go up to a 63 A gL/gG. That's the factory recommendation — don't guess it; the fuse size is part of the contactor's short-circuit rating.