That's the rating that governs the real load, not the AC-3 figure. If you're switching standard squirrel-cage motors, the AC-3 curve is the one to check — this contactor delivers 45 kW at 500 V and 21.1 kW at 690 V, so it covers a wide voltage band without derating surprises. For heavy inching or plugging duty (AC-4), it's rated 66 A at 400 V. That's the worst-case thermal stress number — if your application cycles hard, that's the current limit to respect.
The S3 frame footprint is 70 mm wide by 146 mm tall by 139 mm deep. Main power terminals are screw-type, accepting solid conductors up to 2x 4 mm² (or 2x 2.5 mm² stranded) and stranded up to 2x 50 mm². That's generous for a contactor this size — you can land a 50 mm² cable without a ferrule adapter. The IP20 front cover with box terminal keeps live parts behind a tool-removed shield, which satisfies most panel-build requirements for finger-safe wiring.
The side-by-side mounting allowance (no derating gap needed) saves rail space when ganging multiple contactors. RoHS compliance date is 05/01/2012, so it's been fully RoHS-compliant for over a decade. No REACH or UL mark is explicitly listed in the spec record, but as a Siemens SIRIUS product it carries CE and typically UL/CSA — confirm with the full datasheet for your specific certification requirement.