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RE: Fuse question

Using the simple equation, fuse = 3 X VA/Vmains

Where did you come up with the 3 X? There in 300%.

Maybe electronics is different than electrical wiring for sizing the primary winding fuse size of a power transformer.

For the primary fuse for a power transformer, the minimum fuse size is 125% of the FLA of the transformer. 250% being the maximum fuse size of FLA.

FLA = transformer nameplate VA rating / nameplate voltage rating.
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Edits: 09/22/16
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