The S107-S is a type of power transformer made by Microtran. It is a single-phase, three-wire unit designed for use with 120/240 V systems. It features low-voltage taps for efficient voltage regulation, a 120/240V primary, and a 120/240V secondary. It also has a high efficiency rating, an automatic line voltage balance, an adjustable watt output, and a wide range of wattage ratings. The S107-S is designed for operation with a wide variety of high-wattage appliances and can provide reliable, long-term performance in a variety of applications.