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Buck-boost transformers are single-phase isolated distribution transformers having four windings instead of two. They can be connected as an autotransformer to buck (reduce) or boost (raise) the line voltage from 5 – 20%. Typical reduced secondary voltages are 12, 16, 24, 32, or 48 volts. Commonly found raised secondary voltages are 208 to 230 or 240 volts.
