Capacitor marking question.

Discussion in 'General Electronics Chat' started by stts, Oct 10, 2013.

  1. stts

    Thread Starter New Member

    Oct 10, 2013
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    Trying to fix an inverter from a generator. Its got what Im thinking are polypropylene caps that all need replaced. The solvent that broke up the potting has destroyed them. New caps have DC voltage ratings and AC voltage ratings. But Im not sure what the old cap markings mean. They say "250V~Y3/X2". Does anybody know if this is an AC voltage rating or DC? I have found 1000 volt Polypropylenes that show they are derated for 250VAC in their data sheets. But I can also find 250VDc Polypropylenes. Its that dang tilde character they use. I dont know if its ment to show AC or just a convenient seperator they used at this time. I dont see tildes "~" used much. And what about that Y3/X2? I cant find any discussion of this on the internet.

    Thanks for any light you can shed on this confussion. :)
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    Y and X are safety classes of capacitors, and 250V~ would mean 250V AC.
     
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  3. ScottWang

    Moderator

    Aug 23, 2012
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    You can check this datasheet, it will help you to know more about the X,Y caps.
     
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  4. stts

    Thread Starter New Member

    Oct 10, 2013
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    Ahh, safety caps. That would explain it. Only a few have the AC looking tilde and theres many cap manufacturers in the unit. I was thinkin it was just a makers prefrence. But I looked up safety caps in Panasonics line up and I found one with the same markings. Thanks for turning me on to that. :)
     
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