The AC-2 rating at 400 V is 37 kW — that's the figure that governs switching wound-rotor or slip-ring motors where the load current stays near the starting current throughout the cycle. The AC-4 rating at 400 V is 66 A, which covers reversing or inching applications where the contactor makes and breaks the stalled-rotor current.
The 70 mm width and 146 mm height fit a standard S3 footprint; side-by-side mounting is permitted without derating, which keeps the panel fill factor tight. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C, which covers most enclosure environments without forced cooling.