just wanted to show you my new 0-400V high-power variac, made a video of it.
It's a motor driven 3-phase variac with a power rating of 30kVA. It has a
nameplate rating of 45A per phase and can make twice the power for 2 minutes
(90Amps per phase, 60kVA).
2x2 Contactors per phase and so it even has balancing chokes between each
pair of contactors on each phase. The contact-surface below them is silver
coated, so it has a dark colour.