The power distribution block is required according to the rules, and you need to pay careful attention to the details when you assemble it, both to satisfy inspection requirements and to minimze voltage drop on the jumper that might also be aptly described as the "fuse." This is a heavy item, so it pays to leave off sections you don't need, but be careful to follow all of the wiring rules and guidelines.
Route your 6 gauge power line (from the breaker) into the block and your 6 gauge power line to the 40 amp maxi fuse block in the same section of the block (opposite sides) so that this high current connection does not go through the jumper. Pay close attention to assembly instructions, and allowed wire counts for the connections, found in the "Battery Power Terminal Strip" document found at
http://www.usfirst.org/community/frc...nt.aspx?id=452. I am willing to bet that many teams will guess at this and run into trouble during their technical inspections.
The most critical current handling is for your drive motors, especially if you are using four CIMs on the drive. Your #10 ground lines coming back from your drive motors can be attached in pairs to the ground terminal block, and if you use four motors for your drive you should use two adjacent block sections, feeding the 6 gauge ground line to the other side of one of them.
If I had a spare jumper, aka the "fuse," I would hook it up to TIG welder set for 120 amps or so and see if I could blow it, or at least melt the plastic cover off of it...
Eugene