[RyanN]

You need to use a Victor or Jaguar with a CIM. The starting load is too high, and any stall will quickly ramp up the current to the point where the fuse will pop. Save yourself a lot of effort and put two Victors on it with whatever size breaker you want. You can try using the 20AMP breaker you already have if you do not want to run wire again. If it trips the breaker, go up to 40AMP with 12 or 10AW wire.