Fuse at 250 volts versus fuse at 12 volts


I'm getting mixed answers. Will a 250 volts, 140 amperes fuse blow as fast as with 12 volts?

Best Answer

140 amps through a fuse is 140 amps regardless of the supply voltage in a system and fuse will blow because of current through it.

Now the difference between a 12V fuse and 250V fuse is that the 250V fuse can safely handle 250V when it has blown open, but a 12V fuse cannot hande safely 250V because it is not rated for 250V and it may continue to arc over.