Can someone please tell what the amp rating would be if I use a MDX 3A -
250V fuse in a 125 volt circuit?Thanks, Jim
- posted
17 years ago
Fuse
Loading thread data ...
- Vote on answer
- posted
17 years ago
3 amps.
- Vote on answer
- posted
17 years ago
Thanks for the info. So I take it the voltage stamped on the fuse doesn't change the amp rating. How about if the fuse has 32 volts stamped on it? Would it still be a 3 amp fuse in a 125 volt circuit?
Thanks, Jim
- Vote on answer
- posted
17 years ago
It could very well be an infinite (within reason) amp fuse in a 125V circuit. The voltage rating is the maximum that the fuse is rated to safely interrupt without striking an arc. You can always use a higher voltage rated fuse but never lower.
- Vote on answer
- posted
17 years ago
Nope. It would be a serious risk for fire and personal injury.
3 Amps is a max rating. 250 Volts is a max rating. They don't interact.Read these as Do Not Exceed 3 Amps or 250 Volts.
- Vote on answer
- posted
17 years ago
However, the MDX indicates to me it is a slow-blow fuse...
Mark Z.
- Vote on answer
- posted
17 years ago
"Jim" wrote in news:gzy7h.1146$Kw2.730@trndny05:
NO!
The voltage rating gives the maximum voltage that can be safely interrupt.
If the circuit carries higher voltage, a sustained arc might occur, rather than the fuse quickly interrupting the current flow. This could be dangerous.
-- bz 73 de N5BZ k please pardon my infinite ignorance, the set-of-things-I-do-not-know is an infinite set. bz+ser@ch100-5.chem.lsu.edu remove ch100-5 to avoid spam trap
- Vote on answer
- posted
17 years ago
It would still be a 3A fuse on 125v, but not a properly safe fuse, due to the risk of arcover under fault current conditions. 32v fuses will also generally have much lower max fault current ratings, so again it might be unable to break the fault current, under some circumstances, for 2 reasons. In most cases though it would function as expected.
NT