Last weekend I had a gig that was a complete disaster, two AC adapters burned (MIDI footswitch and talkbox) and a bass amp fuse blown because of power fluctuations and the show even got cancelled after 2 soongs. But the KPA didn't even blink, I know its power supply accepts something like 100-240V, but I was wondering if it ever got above its limit (240V), is there some kind of protection that would turn it off automatically?
I am planning on building one such protection myself because linear power supplies won't take that kind of abuse, I'm guessing the 127V outlets there were at least around 170V for a while, won't ever risk that happening again, so I'm building a very simple relay-based overvoltage protection box that will go between the AC outlets and my gear.