Its AC-3 rating of 55 kW at 500 V means it handles standard three-phase squirrel-cage motors up to that power — the duty class that governs real motor switching, not the higher resistive-load (AC-1) figure. The AC-2 rating of 45 kW at 400 V covers slip-ring motors or wound-rotor applications where the load current stays on during acceleration.
The 70 mm width and 146 mm height fit the S3 frame footprint; depth of 139 mm leaves room for wiring ducts in a 200 mm enclosure. Screw-type terminals on the main circuit accept stranded up to 2x (10... 50 mm²) and solid up to 2x (0.5... 1.5 mm²) with ferrules.
The substance prohibition date of 05/01/2012 aligns with RoHS compliance timelines — the part is RoHS-compliant as shipped.