It's rated for 37 kW at 500 V under AC-3 duty, which is the standard category for starting and stopping squirrel-cage motors during running — the rating that governs real motor sizing. At 400 V AC-2 (slip-ring motors, moderate overloads) it carries 30 kW. The main circuit uses screw-type terminals, accepting solid conductors from 2x 0.5 mm² up to 2x 4 mm², and stranded from 2x 10 mm² to 2x 50 mm². That's a wide enough range to handle both control wiring and power tails without adapters.
The S3 frame measures 176 mm high by 70 mm wide by 152 mm deep. That depth matters when you're laying out gland plates and cable ducts — 152 mm is the body depth, not counting any protruding terminals or arc chambers.