Georgelofi 2-7-2017On the other hand, though, given the various reports we’ve seen in this thread of SR fuses blowing when they shouldn’t it could be argued that going up one or even two rating increments with SR fuses is likely to result in the fuse having a melting point (as measured in amps squared x seconds) that is **closer** to that of the stock fuse than an SR fuse having the same current rating as the stock fuse.
Moving up in amperage with mains fuses, is unsafe.
Doing this is a very unsafe practice.
It will very likely burn out more than just the fuse.
EG: regulators, rectifiers, or maybe even the transformer.
+ whatever caused the fuse to blow in the first place.
The worst is it could start a fire, and take out your house.
Although admittedly the basis for such a contention is muddled by the fact that some (although by no means all) of the reported false blows have occurred at turn-on, when very brief "inrush" current surges, that are expectable in many designs, may greatly exceed the rating of the stock fuses.
In any event, given the lack of meaningful technical data on the SR fuses I don’t think anyone can provide an answer to this question with any kind of certainty, and it is a question about which the opinions of reasonable people (and technically knowledgeable people) can differ IMO. Also, given that some have reported good results with SR fuses that are rated even a bit lower than the ratings of the stock fuses, the answer certainly figures to be equipment dependent.
FWIW, my opinion on this question was stated in a post in this thread dated 1-14-2017, near the top of page 64 (if posts are sorted most recent last). Which was to the effect that I personally would have no qualms about going up one or even two rating increments.
Regards,
-- Al