Transformers difference

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An auto-transformer (also known as an autoformer) has one winding, combining the function of two windings.
One terminal usually serves as a common. Thus it does not isolate the incoming and outgoing sides.

'Furnace' transformer probably refers to a common step-down type, with the primary winding being isolated from the secondary. It is essential to prevent high voltage from contacting gas or liquid fuel.
 

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