When your voltage concentrations are unstable (ie: power stays on, but the actual voltage amount may differ a great deal with the 220V typical), then I think that's the sort of situation the place an AVR is useful. The leading class couldn't be loaded when the class can't be initiated. https://eduardozkrxe.blogginaway.com/34428637/the-fact-about-power-supply-uninterruptible-that-no-one-is-suggesting