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Help with Fuse

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

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  1. davez

    davez

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    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

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    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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