posted March 05, 2013 12:23 PM                   

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Slow blow fuses are more tolerant of surges, like for example when you plug the machine in or light the lamp, so they are less likely to have false trips.

They will allow their rated current longer than the quick blow ones, but all the conductors in the machine should be rated to carry a multiple of the fuse current anyway, so that should not be a problem.

What you are really worried about is a short circuit (fire and electric shock hazard), and given that much current they are ALL fast blow fuses!

There is no fuse fast enough to protect a semiconductor device. I've seen some spectacular damage on stuff with perfectly intact fuses, so fast blow won't buy you a lot there either.

So unless the thing specifically states fast blow, I'd use slow.

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Hello Steve,

Thank you very much for the excellent primer, I really appreciate this. Please send me a bill for the excellent lesson.

Best regards,

Jon