That 95 A AC-3 rating translates to a 45 kW motor on a 400 V three-phase line — the spec that tells you this contactor handles a 45 kW load in a typical European 400 V industrial panel. Auxiliary contacts are 1 NO and 1 NC — enough for feedback to a PLC or a holding circuit without needing a separate auxiliary block. Terminals are screw type, which is the workhorse connection for most panel builders; no special tooling required.
Size S3 means it occupies a specific footprint on the DIN rail or mounting plate — roughly the 174 x 146 x 137 mm package dimensions. That's a common size for 95 A contactors in the SIRIUS family, so it swaps into existing S3 cutouts and busbar systems without re-drilling. Screw terminals accept standard ring or fork lugs; torque specs are on the nameplate.