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Subject: Re: TWL: Different type of fuse in battery charger
From: Arild Jensen (elnav@XXX.XXX)
Date: Wed Sep 25 2002 - 16:29:41 EDT
Bob Siegel wrote:
> Shore power 30 amp. battery charger stopped working. It was fitted with an
> 8 amp fuse which looked like a AGC fuse but instead of containing a glass
> tube between the metal end caps it had a ceramic section. Questions; 1-
> What is the purpose of this ceramic fuse rather than the usual glass type?
> 2. Original ceramic fuse was 8 amp. Most local stores stock 10 amp ceramic
> fuses. Do you see any danger in this substitution? Thanks Bob Siegel
REPLY
The ceramic body fuses have a higher rupture current rating.
They are typically used where the power source has an almost unlimited or at least very large capacity to supply power.
When a fuse blows the melting fuse element disintergrates and a momentary arc forms. With enough power feeding into the fue body this can be like a small explosion. A
plasma arc is also formed.Under the right conditions it wil continue to burn.
A glass body would shatter, throwing glass splinters about and the arc might continue thus posing a fire hazard.
In gasoline boats the additional hazard of explosive fumes also enters the picture. In order for any device to be rated "ignition proof" you must use a fuse capable of
popping without posing a fire or ignition hazard. The ceramic body fulfills this criteria.
Do not substitute a glass body fuse if the ceramic one pops!
regards
Arild
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