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gee said:having designed AC protection for very expensive equipment... you can't beat a circuit breaker upstream from a MOV. For spikes they act fast and absorb a huge amount of energy, and during big surges, they'll just pop the circuit breaker.
promises promises, eh? - http://dkc3.digikey.com/PDF/T052/1135.pdf
For 120VAC operation, you want part # ROV20-201K-S... they offer 114J apiece. They're $4.70 for 10 at Digikey, and to meet the $25 minimum order you're basically buying 60 of them - enough to make a 6840 joule power bar. Put 1 from ground to neutral, 1 from ground to hot, and 58 between line and neutral. This will take up a *lot* of space.
Another way to protect your stuff is to use a PFC power supply - Most power supplies with a 120/240 volt switch can't handle any more than 140 volts on the input, before they pop their main input cap. But a PFC supply running at 120 volts can get a 230 volt surge (which will make a regular supply explode) and it'll just alter its duty cycle and carry on its merry way, powering your computer off the surge.![]()