OLD NEW STOCK. 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 than 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 voltage. More efficient. Smaller and lighter. 5-10 times increase in KVA. Versatile, many applications. Lower cost. 120 x 240 Primary Volts; 12/24 Secondary Volts; 60Hz.