I think this has something to do with the "in-rush" of current that occurs when the compressor turns on. Initially, it takes a lot of current to get the piston moving in the compressor, but after that it only draws about 10 amps. I'm pretty sure this is why they allow the circuit breaker on the spike in place of the 20A fuse.
Even if you're not having problems, I would suggest switching to the auto-reset breaker. It would really stink if your compressor didn't work during a match
