Its 55 mm width and 112 mm height fit standard panel layouts; side-by-side mounting is supported without derating, which matters when you're packing multiple contactors into a row.
The AC-3 motor rating of 18.5 kW at 500 V is the headline number for this size — it tells you the contactor can handle a 25 A motor at 500 V under normal starting duty. For 400 V networks, the AC-2 rating is 15 kW, which applies to slip-ring motors or loads with longer starting times. Auxiliary contact ratings are given for several control voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V.
Wiring and connection details
Main circuit terminals are screw-type. Solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (0.75 to 25 mm²). Switching frequency limits vary by duty: 1200 cycles/hour for AC-1 (resistive), 1000 for AC-3 (motor start/run), 750 for AC-2, and 250 for AC-4 (plugging or inching). If your application requires frequent jogging, the AC-4 limit is the one to watch.