ROBERTSON 3P10133 Step Down Voltage Transformer, 277Vac, 60Hz Primary, 120Vac. Secondary, 25VA Max Load, Model VT235 AM (Replaces Robertson 3M10006, VT235 /A) Economical General Purpose Step-down Auto Transformer; Transforms single phase 277 volts down to 120 volts Durable clamped core and coil construction; Top-quality copper coil windings 25 VA maximum full load capacity Superior Class A Vacuum Pressure Impregnated (VPI) Insulation System (105C) Extremely dependable inherent transient and surge protection