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Help with Fuse

davez

Oct 11, 2014
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Oct 11, 2014
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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?
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
8,393
Joined
Nov 28, 2011
Messages
8,393
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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