Buck-Boost transformers are single phase, four winding transformers designed for two purposes. The first purpose is as a low voltage isolation transformer for use on 12, 16, 24, 32, or 48 volt circuits. When used as low voltage transformers, Buck-Boost transformers have capacities of .050 kVA to 5.0 kVA. Their second, and more important use, is as a Buck- Boost transformer. Buck-Boost means that these transformers are used to buck (lower) or boost (increase)line voltage to match required load voltage. Buck-Boost transformers are used to correct consistently low or high voltage conditions, where the voltage difference ranges from approximately 5% to 27%. Variation of the input voltage is passed through to the output side of the transformer in the same percentage. This concept is important because the question is frequently asked if Buck-Boost transformers will stabilize variable voltages. They will not! Low voltage conditions may be found at the end of long wire runs where a line voltage drop has occurred due to resistance in the wire. While high voltage supply lines are less frequent, they may be found close to voltage distribution points. Buck-Boost transformers offer a simple, economical solution to these common voltage problems and mitigate the harmful heating effects of low or high voltage.