It's rated at 45VA. What gauge wire should I use to replace the fuse?
There doesn't seem to be a trace of it left, that I could find.
2) Since I'm here, how come it is written as 45va, instead of 45 watts, or 2.5 amps?Thanks
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I'd just use a fuse, transformers are rated in VA so yes a 2.5A fuse would be correct. If you're careful you can solder pigtails onto small glass 3AG and 5AG fuses, or you can buy the more expensive ones that have pigtails on them already.
About 3 amps should do it. Tinned copper wire is traditional.
See
Just bear in mind 2 things: this table will be for fuses longer than 1", and shorter ones need thinner wire for the same rating due to end losses copper fuses have a very high melting point, enough to be a fire risk.
NT
It was once the practice to use German Silver for fuses but I think that highly unlikely here. Low temp metals like Woods metal seem unlikely also.
I was a vendor for the first time at a hamfest, and sold another broken one very much like it to a guy, for 10 cents, and he said there was a fuse wire inside. (I didn't burn these out. Someone else did.)
There is no circuit board, just a fiber (as in fiber washer) rectangle, with an empty rectangle in the middle, and wires on either end, one to the tranformer and one to the output screw. So, I guess, I'm sure.
I didn't reallize the question of gauge would be so complicated, as Homer and Meow make clear. But there is room for a fuse. There's even room for a fuse holder. Thanks.
But I was asking this, not just to fix this transformer, but in general: How come I often see written a value like 45va, instead of 45 watts? I've noticed it on these plug-in transformers expecially.
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Because the transformer can only deliver 45 VA not 45 Watts. If your load is totally reactive there will be 0 watts but there could still be 45 VA of load. If the transformer could deliver 45 watts no matter what it could handle 20 A of reactive current - it can't.
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All transformers are rated in VA, the wattage depends on the power factor of the load.
If you use a 1.25" fuse wire mounted on fireproof it should be ok.
VA is volts times amps. If theyre in phase this equals watts, but when out of phase (eg inductive load) the watts figure is less than the VA, and its the current the transformer cares about, not the phase. Hence VA not W.
NT
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