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vk3pa
Deceased
Australia
1714 Posts |
 Posted - 11 Jun 2008 : 11:54:34 AM
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A fuse in series with the mains input to the Transformer.the value can
be calculated as follows....
(power in the secondary of the transformer = power in the primary of the transformer)
Therefore for 13.8v at 20 Amps the secondary power =
13.8V * 20Amp = 276 watts
Calculating from that for a mains supply of 240 volts =
276/240 = 1.15 amp fuse.
I use a 2 Amp fuse in my supply this gives some provision for the large capacitor
charging current ( inrush current )during switch on
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Wot size fuse do I use?
