Can 4-Winding Single Phase Transformer be auto-connected?

Yes. There are occasions where 480 volts single phase can be stepped down to 240 volts single phase by autoconnecting a standard 4- winding isolating transformer as shown below.If connected in this manner, the nameplate kVA is doubled.

For example: A 10 kVA load can be applied to a 5 kVA 4- winding transformer if connected see below.