Its AC-3 rating of 55 kW at 500 V and 25.4 kW at 690 V tells you the motor currents it can handle under full-load starting and running — the rating that governs real-world motor duty, not just resistive heating.
Dimensions are 146 mm high, 70 mm wide, 139 mm deep, so it occupies a standard S3 slot on the rail. Side-by-side mounting is allowed, which saves rail space when grouping multiple contactors in a motor control centre.
Main circuit screw terminals accept solid conductors up to 2x 4 mm² (or 2x 1.5 mm² minimum) and stranded conductors up to 2x 50 mm² — that covers the range from control wiring up to the motor feed cable for a 55 kW load. Auxiliary contact ratings are given for both AC and DC: 10 A at 24 V DC, 6 A at 230 V AC, 3 A at 400 V AC, so you can size your control transformer and pilot devices accordingly.
Environmental and service life
Rated for operating ambient -25 to +60 °C, storage -55 to +80 °C, and pollution degree 3 — that means it's suitable for industrial environments with conductive dust or occasional condensation, not just clean control rooms.