Buck-Boost transformer, Dry type, Single phase (Three phase when combined), Power: 0.75 kVA, Input voltage: 120/240 V AC, Output voltage: 16/32 V AC, 3-phase Buck-Boost: 208-240 V AC (23 A) with two units, Frequency: 50/60 Hz, NEMA 3R, 9.68x4.75x4.51in (HxWxD)