28 Nov
2013
28 Nov
'13
2:18 p.m.
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.
Dwight
From: fraveydank at gmail.com
Subject: Re: 1.5A 25V fuse w/ leads
Date: Wed, 27 Nov 2013 20:53:54 -0500
To: cctalk at classiccmp.org
On Nov 27, 2013, at 20:20, Chuck Guzis <cclist at sydex.com> wrote:
Aren't most automotive fuses specified for 32V? But you'll never find one for
1.5A--automotive fuses tend to be for multiple amps. Most common fractional-amp fuses
are specified at 250V.
Yeah, you want to be able to block the nominal working voltage
plus any inductive kicks you might get from the load when the
fuse blows. I usually see 250v fuses for consumer stuff, 120v was
just an example. Automotive fuses are usually 7.5 amps and up,
in my experience, though I've seen 3.25 in the wild (there's one in
my lighter-port inverter).
- Dave