200V to 240V Buck-Boost Transformer — Step-up, 3-Phase Delta
See how a 200V to 240V 3-phase delta buck-boost transformer corrects voltage and how to select the proper model.
Choosing a 200V to 240V transformer
A 240 volt heating element fed at 200 volts delivers about 69 percent of its rated output, because resistive power falls with the square of applied voltage. A 200V to 240V buck-boost transformer applies a 20 percent boost and gives that element the voltage it was built for. This is the largest correction in the 200 volt family, and it appears wherever 240 volt equipment has been installed on a legacy 200 volt system or on a 208 volt service that reads 200 under load. Single-phase and three-phase, 10 through 60 amps.
240 volt equipment on a low 200 volt supply is a mismatch that usually arrives with the equipment rather than with the building. Someone specifies a machine, an appliance or a charger built for a 240 volt residential or light commercial system, and it lands on a commercial service that reads 200 when everything is running.Where this happens most:Process heat: duct heaters, immersion heaters, ovens, kilns, and platen or band heaters on extrudersCommercial kitchens: fryers, griddles, holding cabinets and dishwasher booster heaters specified at 240VWelding and plasma cutting equipment carrying a 240 volt input ratingEV charging equipment and shop machinery built for a 240 volt single-phase supplyOlder 240 volt production machinery relocated into a building fed at 208Resistive loads dominate that list for a reason. A motor at 200 volts on a 240 volt nameplate is 17 percent low and will usually trip or fail outright, so the problem announces itself. A heater does not trip at all. It quietly runs at roughly two thirds of its rating while the process falls behind schedule.