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Thermistor ?

Discussion in 'Power Electronics' started by Spike009, May 19, 2020.

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  1. Spike009

    Spike009

    3
    0
    May 19, 2020
    Hi guys, I have what looks like 2 red thermistor that blew up. They are located between both of my 240v line and my neutral. Can anybody confirm thermistor could be located there and does anybody have a idea why the blew up. How do I know what replacement part to get now that they blew up and that the number is gone.
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,655
    1,888
    Sep 5, 2009
    rather than a thermistor they are likely to be ...
    1) MOV ( most likely)
    2 PTC
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    10,386
    2,270
    Nov 17, 2011
    MOV!
    A thermistor between life and neutral is useless. What's printed on the good ones you show in pic #2?
     
  4. Martaine2005

    Martaine2005

    2,935
    801
    May 12, 2015
    I 2nd and 3rd that.

    upload_2020-5-19_9-6-22.jpeg

    Martin
     
  5. Spike009

    Spike009

    3
    0
    May 19, 2020
    Thank you for your answers. Yes it must be MOV. Thanks for getting me on the right track. I will try to find out why the voltage went up and blew up both of them. What do you guys think? Could the problem come directly from the varistors?
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    10,386
    2,270
    Nov 17, 2011
    Unlikely. Varistors usually are inactive, they become conductive in case of an overvoltage which cannot be caused by the varistors themselves.
    If designed correctly, that is.
    The device probably experienced a surge event on the mains line.
     
  7. Spike009

    Spike009

    3
    0
    May 19, 2020
    No fuses blown up on the card.
     
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