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Blown thermistor in AC Inverter

Discussion in 'Troubleshooting and Repair' started by Jaibh, Oct 7, 2014.

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  1. Jaibh


    Oct 7, 2014
    Hi all,

    I have a Dayton AC Inverter 3HX70 which had its thermistor blown because of high voltage. There are no remains of reference no/ part no to check its capacity.

    AC Inverter.jpg How do I determine the capacity to replace it with?

    Thanks in advance
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Welcome to our forum.

    A thermistor doesn't have a capacity, that term is for capacitors. A thermistor has a rated voltage and a max. power. You will not be able to determine these parameters from the burnt component. You will need access to the schematics, a parts list or a working unit where you can read the inscription on the thermistor.
  3. debe


    Oct 15, 2011
    Looks more like one of these, a VDR voltage dependant resistor as a surge protector. They come in different voltage ratings & sizes, & sometimes are destroyed doing there job as in your picture. VDR.JPG
    Harald Kapp likes this.
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Good tip. Note that the inscription on the image is for demonstartion only. You need to find the correct value for your unit from a manual, schematic, a BoM or a working unit.
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