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In Reply to: RE: AC Power posted by theaudiohobby on May 11, 2008 at 08:07:31
There's an interesting web page that shows the internals of a Shunyate Hydra Model-4 here. The manufacturer's literature of this device claims that it contains a "7-element 'Venom filter'". LOL!
The device has a garden variety circuit breaker in series, along with 0.1uF filter capacitors and metal oxide varistors (MOVs) across the outlets. The author of the above site lists the part numbers of the MOVs and capacitors. The Littelfuse MOV data sheet PDF can be found here. The part is in the fourth row under "standard models" (P/N TMOV20R130E). The Vishay capacitor data sheet PDF can be found here. It is in the last row (P/N F1710-410-10XX). The listed value of 0.01uF appears to be a misprint. It should be 0.1uF.
The capacitors are of the type specifically rated for mains operation. They have the property that if their maximum voltage rating is exceeded and they fail, they won't catch fire.
The MOVs act like an open circuit until they reach a critical voltage, above which they begin to act like a short. The original GE MOV application note from 1972 can be found here. Looking at the Littelfuse MOV data sheet, it appears that they begin to conduct (1 mA current) at a minimum peak voltage of 184 Volts. This happens to be the peak value of a 130VAC sine wave (they are rated at 130VAC). Also, it looks like they can withstand peak currents of up to 100A, which occurs at a maximum voltage of 340V peak.
The Furman device that theaudiohobby mentions above looks much more sophisticated. It appears to completely regenerate the AC.
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