How does a buck-boost transformer differ from an isolating transformer?
A Buck-Boost transformer is manufactured as an isolating transformer, with separable primary and secondary, and is shipped from the factory in that configuration. When the end user at site connects it, the primary is connected to the secondary changing the transformer’s electrical characteristics to those of an autotransformer. This provides the smaller voltage correction that is typical of Buck-Boost. The primary and secondary windings are no longer isolated as they are connected together.
