I agree with the people saying that canned-air cooling wouldn't last, but I wonder if anyone's ever considered mounting the breaker in a 'refrigerator' made with a 12volt peltier cooler? If you don't know what these are, here's one:
http://www.adafruit.com/products/133...FYKPMgodZhwAiQ
I'm nearly sure there will be some rule that negates this possibility and giving up 5 amps of battery isn't so good either, but you could shut it off under high driving current-draws.