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  Fuse types SFE and AGC

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Author Topic:   Fuse types SFE and AGC
Fishmore posted 05-16-2010 01:40 PM ET (US)   Profile for Fishmore   Send Email to Fishmore  
I learned something new while running battery cables for my Montauk. I accidentally broke the 20-ampere glass fuse that is attached in a case to the side of the starter. When I removed the fuse it was an SFE 20 amp. I went in the garage to get a new fuse and all I had were AGC 20 amp fuses. I did not know the difference and looked it up.

It seems that both the SFE and AGC are glass fuses with a meltable link within the glass. Both SFE and AGC fuses are 1/4-inch in diameter. All AGC fuses are 1-1/4-inch in length regardless of amperage. However, SFE fuses vary in length by the amperage rating. Length varies from 5/8-inch for a 4-ampere To 1-7/16-inch in for a 30-ampere. They refer to the SFE fuses as "size rejecting" because the size differences are related to the amperage rating and tends to prevent inserting the wrong fuse amperage rating in to the fuse block.

On boats we usually use generic fuse blocks or holders so when purchasing replacement fuses the AGC fuse is the better choice to purchase.

By the way the 20-ampere fuse in SFE or AGC is the same size so they are interchangeable.

jimh posted 05-16-2010 02:49 PM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the information. I also note that the AGC and SFE fuse types are both "fast-acting" fuses.

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