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In Reply to: RE: Fuse Holder posted by geezerrocket on June 05, 2016 at 20:11:04
Some 1/4 x 1 glass fuses are rated at 32v, primarily for automotive use. But they still are the standard glass tube construction.
So what is the difference between these and standard 250v fuses.
Different grade glass?
Follow Ups:
Gusser - The voltage rating has to do with what's called flashover. Did you ever see a fuse that blew so hard that is coated the inside of the glass with metal? This can cause it to re-conduct. The safest bet is to use ceramic fuses. They have an arc quenching powder inside, preventing the flashover effect. 32v fuses should only be used in cars.- Pete
My meter has two internal fuses, one of them rated for 600v. Edit. Both fuses are rated at 600 volts, one 800ma, the other 10AThe 0.8A fuse opened, and I had a difficult time locating replacement fuses with the same rating. My homework revealed that the voltage rating has to do with how far back the element melts when the fuse opens. This is to help avoid arc-over which might occur if a 250v fuse were used where voltages exceed 250v.
FenderLover is correct not to use a 32 volt fuse (unless the voltage is < 32 volts, of course).
Edits: 06/11/16
"My homework revealed that the voltage rating has to do with how far back the element melts when the fuse opens. This is to help avoid arc-over which might occur if a 250v fuse were used where voltages exceed 250v."
I never knew that. I knew it had to do with insulation value but never understood how.
What you said makes perfect sense.
Thank you.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
My search for the fuse voltage rating information was born out of frustration, simply because of how difficult it was for me to find an 800mA, 600 volt fuse for my meter in quantities of less than 1000.
I was tempted to use a 250v, or a 440v 0.8 A fuse, both of which I could find in smaller quantities, but I knew there had to be a reason the meter came with 600v fuses installed.
Now if I can just come up with 149 other things to tell you that you didn't know, we'll be even. Meaning, I've learned a lot from reading your posts over the years, so thank you too!
Because they tend to be rated 10 to 20 amps. I've see more than a few guitar amps completely fried, when someone stuck an auto fuse into the amp --- so they could continue a gig. Then, forget to replace it with the proper amp rated fuse --- which is usually around 2-5 amps.
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