The 48 V AC 50/60 Hz coil is a control-voltage choice common in older panel designs or where low-voltage control circuits are preferred; the starter itself handles motor power from 15 kW at 220–230 V up to 33 kW at 660–690 V, so the same unit covers a wide range of supply voltages by simply changing the incoming line taps.
Mounts on a plate — not DIN rail — so it needs a drilled backplate in the enclosure, with the 281 mm width and 143 mm height dictating the cutout and clearance around the disconnector handle.