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31-01-09, 05:56 PM

Fuses are made very carefully so that the fuse element heats up sufficient to melt the element & break the circuit.

I'm pretty sure that's due to the power flowing through the fuse element. Power is a function of both voltage and current.

So I suspect (but I've never had a reason to test it), that a 230V 13A fuse running at 12V would require more than 13A to generate enough heat to melt the element. How much more, I don't know.

EDIT: Thinking about it, it'd be energy dissipation, which is current & resistance.

So, I wouldn't try it, but I can't remember what effect it would have. Surely there's somewhere open near you that sells the right fuses?

31-01-09, 05:56 PM	#4
Baph Guest Posts: n/a	Re: are fuses voltage rated? Fuses are made very carefully so that the fuse element heats up sufficient to melt the element & break the circuit. I'm pretty sure that's due to the power flowing through the fuse element. Power is a function of both voltage and current. So I suspect (but I've never had a reason to test it), that a 230V 13A fuse running at 12V would require more than 13A to generate enough heat to melt the element. How much more, I don't know. EDIT: Thinking about it, it'd be energy dissipation, which is current & resistance. So, I wouldn't try it, but I can't remember what effect it would have. Surely there's somewhere open near you that sells the right fuses? Last edited by Baph; 31-01-09 at 05:59 PM.