Newbie looking for help!

Discussion in 'General Electronics Chat' started by Ace106, Apr 8, 2015.

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  1. Ace106

    Thread Starter New Member

    Apr 8, 2015
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    Hello,

    I am sure someone has the answer. I have a componet on a small power PCB, I can not identify the symbol. At first I thought it might be a zener diode, but now I'm unsure. The symbol looks a little like a diode but very different also. The componet looks like a disc capacitor and the part number is znr7k221u. I will post a picture of the symbol if anyone needs more info. Thanks for any help you can offer.
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    Perhaps an MOV?
     
  3. Ace106

    Thread Starter New Member

    Apr 8, 2015
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    Thank you for your reply. Forgive me, but I don't know what a MOV is.
     
  4. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    MOV = Metal Oxide Varistor
    MOVs function as surge absorbers/diverters...

    @Ace106
    Edit: the described device (ZNR7K221U) seems to be rated at: 140 volts(AC) /180 volts(DC) however I can't seem to find the energy rating...
    Edit2: based upon similar devices said rating is likely 15.5 Joules (10/100 microseconds waveform)

    Best regards
    HP
     
    Last edited: Apr 8, 2015
  5. ScottWang

    Moderator

    Aug 23, 2012
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