It operates on 400 V AC (single- or multi-phase) at 50/60 Hz, and is also rated for 230 V AC single-phase and up to 72 V DC maximum.
Where it fits in a panel
That's high for a 1-MW device; it's designed for installations with high available fault current, like industrial switchboards near transformers. Under UL 1077 and CSA C22.2 No. 235, the interrupting rating is 5 kA — a different standard, so check which applies to your jurisdiction. The C-curve (5-10x In) is the default for motor and transformer branch circuits; if your load is purely resistive, a B-curve would trip faster on overload, but for most industrial loads C is correct.