What is this component?!?

Discussion in 'General Electronics Chat' started by YazanJuve, Dec 15, 2009.

  1. YazanJuve

    Thread Starter New Member

    Dec 13, 2009
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    please anyone can tell me what is this component?
     
    • MOV.jpg
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  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    That would be a metal oxide varistor. It's used to suppress voltage spikes.

    eric
     
  3. Paragon

    Member

    Dec 8, 2009
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    It will look like a large flat ceramic capacitor. Most of the time you will see them with heatshrink wrap around them. If they blow, sparks will fly (especially when you are running on 200 or 400+ volts - will blow a hole in the side of the MOV hence the heatshrink. A double layer might be good))
    They do their job and protect the equipment.
     
  4. YazanJuve

    Thread Starter New Member

    Dec 13, 2009
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    thx all but Paragon i don't understand what do you mean exactly by "double layer"?
     
  5. SgtWookie

    Expert

    Jul 17, 2007
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    He means that they will put a piece of heatshrink tubing on, shrink it, and then put another piece of heatshrink tubing on over the first piece, and shrink that.

    It keeps the pieces from flying around more effectively that way.
     
  6. YazanJuve

    Thread Starter New Member

    Dec 13, 2009
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    if you can get me a picture showing that heatshrink and how to add another one over it that will help me a lot :)
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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  8. Paragon

    Member

    Dec 8, 2009
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    Really depends on your voltage. When I was first introduced to an MOV, it was in a high power test lab equipment (we are talking 480V 3phase or whatever it was) and there was a surge over night. Machine wouldn't go on. Finally saw that the power boox illuminate inside when the power breaker was closed. There were the sparks. MOV was the size of a quarter with a hole straight through it. I think it had one thick layer of heatshrink on it which contained most of the sparks. The rest of the MOV was vaporized.

    Anyhoo.. back to heatshrink. It is just the black tubing you slip over connection and heat with a lighter/match/whatever and it shrinks. usually can get 2:1 or 3:1 (shrinks to half or a third original size) Just get a diameter large enough to go over the MOV and have at it with the heat. Don't worry about double layering.
     
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