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Varistor rating

Discussion in 'Electronic Basics' started by Jack// ani, Dec 20, 2005.

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  1. Jack// ani

    Jack// ani Guest

    Hi all,

    I've two varistor....from two different PCI dialup modem. TUR 07271 and
    ZOV 07D241K is written over it...was is the voltage and current rating
    likely to be, how to read it??

    Thanks
     
  2. I think the 07 (or 07D) prefix refers to 7mm diameter. Is this about
    the size of the disk under the epoxy coating?

    I think 271 refers to a 27*10^1-270 volts AC and 241 refers to 240
    volts AC. The DC peak rating will be about 1.4 times that.

    If you look up this size and volt rating MOV from almost any
    manufacturer, you can get some pretty good ideas of the surge current
    ratings.

    For example:
    http://www.epcos.com/inf/70/db/var_01/01590173.pdf
     
  3. Jack// ani

    Jack// ani Guest

    Thanks John. Oh...yes, physical size is around 7mm as you said....I
    hope the rating are also true.
     
  4. Franc Zabkar

    Franc Zabkar Guest

    ZOV = zinc oxide varistor ???

    - Franc Zabkar
     
  5. Guest

    TVR 07271 and ZOV 07D241K

    TVR and ZOV is the brand of the varistors which the manufacturers
    produce.They are electronic company in Taiwan and the factory in China
    mailand.

    Sometimes ZOV = zinc oxide varistor ,just like MOV=metal oxide
    varistor.

    Jashon in CHina


    Franc Zabkar 写�:
     
  6. Guest

    You are right.TVR 07271:
    the 07 (or 07D) prefix refers to 7mm diameter. this is about
    the size of the disk under the epoxy coating.

    But 271 refers to a 27*10^1-270 of VARISTOR VOLTAGE RATING.What is the
    Varistor Voltage rating?

    Varistor Voltage Rating (Vdc):
    The peak DC voltage measured across the varistor when a specified
    current, Ic, is applied. For 5mm devices, Ic=0.1mA; for 7,10,14,20mm
    devices, Ic=1.0mA.


    Also the surge current means Max. surge current under impulse current
    (8x20us waveform) instead of the normal current.

    I have worked in a varistors manufacturer.Now we sell the MOV.

    Buy the way,how do you think the varistor market in your market?
     
  7. Guest

    TVR 07271 and ZOV 07D241K

    TVR and ZOV is the brand of the varistors which the manufacturers
    produce.They are electronic company in Taiwan and the factory in China
    mailand.

    Sometimes ZOV = zinc oxide varistor ,just like MOV=metal oxide
    varistor.

    Jashon in CHina


    Franc Zabkar 写�:
     
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