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  'SFE' designation on blade fuse?

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Author Topic:   'SFE' designation on blade fuse?
Frank O posted 07-03-2008 11:57 PM ET (US)   Profile for Frank O   Send Email to Frank O  
The owner's manual for my 1994 Mercury 225 outboard encourages me to carry spares of the "SFE 20 AMP fuse" installed in the electric starting circuit. The fuse looks like this:

In Internet searches, I can't find any references to "SFE" blade fuses. I gather that SFE stands for "Society of Fuse Engineers," and apparently they must have had a spec for blade fuses at the time the manual was printed in the mid-1990s. In current usage, however, "SFE" seems to specifically apply to cylindrical glass fuses.

With all of the above in mind, is there anything in particular I should be looking for in picking up spare blade fuses? Will any automotive "maxi blade" fuses do, or is this an area in which it's important to go with a version rated for marine duty?

jimh posted 07-04-2008 05:15 AM ET (US)     Profile for jimh  Send Email to jimh     
SFE seems to refer to a cylindrical glass fast-acting automotive 32-volt fuse, at least from fuse maker BUSSMAN:

It does not look like the blade fuse you have illustrated above.

The Mercury technical writers probably pulled some boiler plate paragraph out of another Mercury technical manual and bolted it into your Mercury manual with inappropriate results.

jimh posted 07-04-2008 10:11 AM ET (US)     Profile for jimh  Send Email to jimh     
There is also the possibility that sometime after the original installation the fuse holder on your motor was upgraded or changed to the blade style.
Frank O posted 07-04-2008 08:36 PM ET (US)     Profile for Frank O  Send Email to Frank O     
Thanks for the input, Jim. Interestingly, both the original owner's manual and the Merc shop manual have drawings that clearly show a blade fuse, but both refer to it as "an SFE 20 AMP fuse."

I stopped by a chandlery this morning and bought a few Ancor 20-amp blade fuses.

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