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How to calculate R and C values for snubber circuit

Discussion in 'General Electronics Discussion' started by hca, Sep 2, 2012.

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  1. hca


    Aug 28, 2012
    I am going to be using a push button to control the on/off operation of a 12 V DC motor which will run up to 10 A (steady state). To prevent arcing across the contacts, I intend to use an RC snubber in parallel with the contacts. My question is how do I calculate the required values for R and C?
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Your question cannort be answered in general as the Snubber depends on the operating characteristics of your circuit (voltage, current, load, frequency). Have a look at this application note. I hope it helps.

    By the way: at 12 V I don't think you need a snubber at all. If you use a relay that's rated for this voltage and current (possibly automotive) you will not need a snubber. Arcing is not an issue at 12V.
  3. hca


    Aug 28, 2012
    Thanks Harald,
    The application note was very interesting.
    I guess I won't need a snubber
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