I'm using one like this. resetable so you will not have to replace it if it trips.
I have two of this style, one for my feed and one for the trolling motor.
hows this one:
im looking at the 2nd to last one the Bussman 'Short Stop' Manual Reset Type 3 Circuit Breaker
The Short Stop should be fine. Any is beeter than nothing as long as the amperage isn't too high for what you are trying to protect. If you have the manual on your motor, it should state someplace what it should be fused at.