SFE fuses are 'automotive', rated only to interrupt 32 volts. The length
depends on their current rating, ranging from 5/8" for a SFE-4, to 1-7/16"
for a SFE-30.
AGC fuses are 'general purpose', they are always 1/4" by 1-1/4", available
in 250V ratings to 10 amps, and 32V ratings to 30 amps. An AGC-20 is the
same length, and pretty much interchanges with an SFE-20.
Both types are "fast acting", but according to my Buss charts, the SFE is a
little faster. An AGC-20 is rated to carry 27 amps for up to 60 minutes,
while an SFE-20 will blow in under 2 minutes. However, the 60 minutes is
given as a maximum, while the 2 minutes is apparently typical, so that may
not be an accurate comparison.
Randall
>
> What is the difference between AGC and SFE fuses? I need to buy spares
> since I recently had a fuse fail (no continuity, but no sign that it
> burnt out) and now I am running on my last spare 20A Buss fuse. Is
> either one a "slow blow" type.
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