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RE: Some fiddling and some discoveries...

bcowen,

I see you deleted your previous post. Here is my response.

You are correct for the maximum current rating of the secondary. The data sheet shows for parallel, 15Vac, the transformer is good for 1.66 amps.
25Va/15V = 1.667 amps.

For the primary winding you have to divide 25Va by 115V.
25Va/115V = .217 amp.

Recommended minimum fuse size rating.
.217 X 125% = .27amp

Maximum fuse size rating.
.217 X 250% = .543 amp

I would not use a fuse bigger than 1/2 amp on the primary side feeding the transformer. As for why the 1.25 slow blow fuse blew my bet the OP shorted out the secondary windings by hooking them up wrong, or, he wired them in parallel out of phase with one another. Hopefully he didn't fry the transformer.

A 1.25 amp fuse would be about 575% of the FLA of the primary.
.217 X 575% = 1.25 amp



Edits: 11/06/16 11/06/16 11/06/16
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