I don't believe that I said that there as no minimum but one has to believe that the fuse curve itself would change at a lower voltage, that the fuse curve is base upon the fuses rated voltage and current. You can't change the fact that you a still dealing with power when a fuse clears at a higher voltage than at a lower voltage as well as the makeup of the fuse element.
I have a fuse bool "Electric fuses" by A. Wright & P.G. Newbery an Institution of Electrical Engineers power series 20. which has more formulas andcurves than you can shake a stick at and I'm not sure if I can make heads or tales out of it. When I'm on the john I have to take a look at to and see if I can figure it out.
The book is about 6"x9", 1/2" thick with about 200 pages. As such there must be enough about fuses a stretch 200 pages on the subject.
If not it at least it looks impressive.
Enough of this. I'll have to revisit this later as I have to go see the 10 year ol grand son play baseball this evening.
Enjoy the game! :thumbsup:
Glad you have your priorities straight!
Back to the topic, a fuse 'blows' because it's element is heated to it's melting point. Heat is a result of I (sq) R losses. I don't see voltage in the equation.
What I do notice is on dual rated fuses, the DC rating is always much lower than the AC rating, so in addition to the above, we must consider the zero voltage cross point. That said, a fuse designed for 120 volts AC may blow at a different current rating at 12 volts DC, not due to the lower voltage, but due to the lack of a zero voltage cross point.
So, if we are to compare a fuse with a 125 volt AC rating to one with a 12 volt rating, the 12 volts has to be AC as well. Which of course, won't happen, but we do have lot's of 24 VAC to work with.