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Fuse question

Discussion in 'Electronic Components' started by K, Oct 26, 2004.

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  1. K

    K Guest

    I have MQ3 fuse. The datasheet says that it has maximum
    power dissipation of 0.48 Watts, ampere rating of 3 amps and
    maximum voltage drop of 0.2 volts. My question is that if it
    dissipates 0.48 watts when the current is almost 3 amps, then how
    much power does it dissipate when the current is for example only
    0.1 amps? How can I find equal resistance for the fuse?

    Here is a link to the datasheet:
    http://www.belfuse.com/Data/DBObject/MQ.pdf


    Thanks
     
  2. Dave Platt

    Dave Platt Guest

    I have MQ3 fuse. The datasheet says that it has maximum
    You'll probably have to actually measure it, under different levels of
    current loading, to determine its actual characteristics. Fuses are
    not simple fixed-value resistors... they're almost always nonlinear,
    especially at the high-current end of their range.

    To a first approximation, the dissipation is going to decrease as the
    square of the current decrease. I suspect that the actual power
    dissipation at 0.1 amps is going to be less than that, as the fuse's
    temperature will have decreased somewhat and its resistance will thus
    have fallen a bit.
     
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