OT: fuses

From: Marvin Johnston <marvin_at_rain.org>
Date: Sun Dec 28 14:15:00 2003

Fuses are based on current, not power (voltage times current); you need
to use the recommended current rated fuse :). Put in a 2A fuse, and
things should be fine.

Since the fuse does have some resistance, and power relates to heat
generated, I suspect that higher voltage rated fuses have less
resistance than lower voltage rated fuses so less heat would be
generated. If so, then the higher voltage rated fuse would be safe to
use on lower voltages, but not the other way around. Anyone have any
comments on this?

Chad Fernandez wrote:
>
> Hi all,
>
> I went to Radio Shack last night to buy a fuse for my laserdisc player.
> I needed a 125v 2amp fuse. Most of the fuses I saw were rated at
> 250v. I bought a 250v .75amp fuse, thinking that if I up the voltage I
> have to lower the amperage. The new fuse blows instantly. Am I
> thinking about this incorrectly? Now, I'm thinking I was wrong since
> the fuse still only has 110 voots running through it..... so do I still
> need a 2 amp fuse even if it's rated for 250 volts? Can I use a 250volt
> 2 amp fuse safely?
>
> I mentioned that the .75 amp 250volt fuse blows instantly..... does this
> indicate that another problem exists, or would the laserdisc player pull
> more than .75 amps? The player has been sitting in my living room,
> hooked up, but unused for months. I have had electrical storms here of
> course, but all my equipment is on a surge protector, and nothing else
> has gone bad.... (amps, dvd player, tv).
>
> Chad Fernandez
> Michigan, USA
Received on Sun Dec 28 2003 - 14:15:00 GMT