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Why are Buck-Boost transformers shipped from the factory connected as isolating transformers, and not pre-connected autotransformers?

April 26, 2017autotransformers buck-boost connected factory isolating shipped transformers

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Why are Buck-Boost transformers shipped from the factory connected as isolating transformers, and not pre-connected autotransformers?

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The same 4-winding Buck-Boost transformer can be connected eight different ways to provide a multitude of voltage combinations. The user when assessing the supply voltage at site can best determine the correct connection.