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My limited understanding of sizing of breakers/fuses has the following
as the underlying premise:
The fuse/breaker is there to protect the wire - and not specifically to
protect the device.  I think that you first need to determine the size
of the wire needed to supply the current requirements of the device
(radio, pump, etc.) and then determine the rating of the fuse/breaker
needed to protect that wire size.  To say that you need a specific amp
fuse for a circuit without considering the wire size could lead to a
significant problem - namely, fire.  Could ruin your day.(g)

A good source for this info is AeroElectric Connection. www.aeroelectric.com  Bob Nuckells has writtin a book about airplane
electrical systems that covers this topic extensively.

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.