28 Nov
2013
28 Nov
'13
4:55 p.m.
On 11/28/2013 06:18 AM, dwight elvey wrote:
The voltage rating has some importance other than
being able to open. The voltage drop at the rated
current can also be an issue. A 250 volt fuse in a circuit
that runs at 120 volts can easily tolerate 1/2 volt
drop while a low voltage circuit may not have the same
ability.
In order for a fuse to blow, it has to get hot. To get
hot it has to consume power. That is I*E.
For very low voltages, I could imagine where this is an issue, but in
all cases, it's not I*E, but I*2*R that matters more.
--Chuck