Capacitors power rating

Discussion in 'General Electronics Chat' started by yassser, Dec 4, 2012.

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  1. yassser

    Thread Starter Member

    Jul 25, 2011
    Hello ,

    I want to ask about the power rating of ac capacitors like this one :

    what is mentioned is only its voltage rating , why is there no mention of the power rating , how could I know that it would withstand the current that will pass through it .

  2. The Electrician

    AAC Fanatic!

    Oct 9, 2007
    You could email the manufacturer and ask them what the ripple current rating of the capacitors is.

    You could obtain a few of the values you wish to use and measure the ESR. The ESR determines the heating of the capacitor when it is carrying a current. Determining ESR by measurement doesn't give a guaranteed maximum value for ESR, but at least you will have a number to start with.

    These capacitors are polyester dielectric capacitors which typically aren't very good with respect to ESR. How will they be used?
  3. bertus


    Apr 5, 2008
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