On Wed, 01 Jan 2020 17:00:03 +0100, HW wrote:

On Mon, 30 Dec 2019 13:56:06 -0800, wrote:

isolated auto transformer

I always thought an autotransformer was a transformer with only one
winding, and input and output partially share that one winding.

But if that is true, an autotransformer cannot possibly be isolated.
Yeah, it seems odd to have an isolated auto transformer. But it is.
The auto transformer is isolated by another transformer all in the
same case.
Eric