I'm actually wondering the same thing.
Does it help? We are in the process of putting surge suppression on our 600V main line in our facility to help protect our equipment but a lot of people claim it won't do much for a big surge.
Well, a big surge will probably blow the fuses on the main electrical line, no? So I would be more worried about small stuff that won't blow the fuses.
So much conflicting information out there over what actually works.
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