[Amps] dumb query about fuses (maybe!)

[jmltinc at aol.com]

There is no dumb question.

Voltage ratings have to do with arc-over within the fuse. That is,?for a given open circuit voltage, a?fuse rated at 240V is less likely to arc over than a fuse rated at 120V under a short circuit condition. Under short circuit, as the fuse element reaches its melting temperature, a plasma can conduct current after the element has opened. 

Ceramic fuses have a higher Breaking Capacity; that is the max current it can handle without shattering.

-John, N9RF




-----Original Message-----
From: Van K7VS <wa7fab at cdsnet.net>
To: amps at contesting.com
Sent: Tue, 12 May 2009 3:05 pm
Subject: [Amps] dumb query about fuses (maybe!)



I know ohms law so don't need the math.  Just a very specific question 
regarding fuses used in an amplifier on the AC side.

My amp requires 15 amp fuses if using 125V and requires 10 amp fuses for 
220V operation.

Does the voltage of the fuse make any difference??  i.e  What happens if I 
use a 15 amp fuse rated at 125V rather than what they ask for?  (10 amp at 
240V)....does the voltage rating make a difference??  Or just the current 
rating of the fuse?

And finally, is a ceramic better than a glass fuse for some reason?

I know this may sound pretty dumb to some but missed the the class on fuses.

Thanks much.  Van, K7VS 


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