I give, what is it ?

An electron scrubber? :B

Might be an autotransformer or just about anything. I'd not touch it without seeing more info such as a schematic or at least a name and model number.

Looks like a buck boost transformer, with a 30 amp input and 50 amp output adapter

Big enough to be a "line conditioner" but those don't need a high low switch

Look close. It takes 30 amp in and 50 Amp out. Home made booster?

Autoformer

All this time i haven't used one, wonder why my power cord hasn't clogged with all those years of dirty camp electric going through.