Actually you can.
Buy one or two of these or similar.
You are only looking at both extremes. If your wire can only handle 5 amps and you have a 10 amp fuse, when you draw anything between 5 and 10 amps, you will melt your wire and no fuse will blow. This is extremely dangerous and typical of people without any sort of electrical knowledge (not saying you don't).
The same mistake is people who are home owners. They plug their TV, game system, stero, computer, and a few lights to the same outlet and keep blowing the breaker. They think, "Oh, I'll just increase the rating of the breaker!" So they do, and then their house burns down, because their breaker wasn't keep the wire from getting hot anymore.
ALWAYS fuse a wire with a fuse that has a LOWER current rating than the wire. It's just that simple guys.
So if you put a wire that can handle AT LEAST 20 Amp between those pins, you will be OK without a fuse. Good luck!