250 VA, 1-Phase, 240 x 480 Primary Volts - 120/240 Secondary Volts, NEMA 3R, Shielded Isolation Transformer, Epoxy Encapsulated, 50/60 Hz. HxWxD: 8.68" x 4.08" x 3.88". ***Not Reverse Feed Capable and For Use with 3-Phase Source by Connecting Primary to Any Two Wires of a 3-Phase System***