Acme T181058, 0.5 kVA Busk Boost Transformer, 120 X 240 Primary Volts 16/32 Secondary Volts. Electrical and electronic equipment is designed to operate on standard supply voltage When the supply voltage is constantly too high or too low, usually more then 55%, the equipment fails to operate at maximum efficiency A buck and boost transformer is a simple and economical means of correcting this off standard.