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Help with Fuse

Discussion in 'General Electronics Discussion' started by davez, Oct 11, 2014.

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  1. davez


    Oct 11, 2014
    I have a power supply project which has a 1 ampere transformer is it possible if I use a 3 ampere fuse will there be any effects?
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    If you mean that the transformer's secondary is rated for 1A and you want to use a 3A fuse in series with it, there's a fair chance that if there's a fault downstream of the secondary (e.g. a shorted rectifier), the transformer won't be able to supply enough current to blow the fuse. So I would say no, don't do it. Use a fuse around 1.5A. Also, use a slow blow fuse, so it won't blow on the surge when the smoothing capacitor(s) charge up when power is switched on.
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