When adding an electrical device to a fuseblock, the in-line fuse that comes with the device is....
1. Completely unnecessary and can be eliminated.
2. Nice to have since it adds an extra "layer" of protection
3. An absolute requirement if protecting your wiring/bike is of any importance to you.
Case in point.
I have a Centech AP-2 installed on my 2006 R1200GS and just received a Gerbing Dual Portable controller to manage my Gerbing Jacket and Gloves. I connected the controller to a 10A switched circuit on the Centech. Can I eliminate the in line fuse (also 10A) that Gerbing included? Seems to me that if I wired the unit straight into the battery, then the fuse is needed. But do I really need two 10A fuses about 6 inches apart from each other?