[Al Skierkiewicz]

The Fisher Price motor is speced at 70 amps in stall. You can run whatever size breaker you want as long as it is sized for the wire you are using. If designed for running at well less than 30 amps then you can install a 30 amp circuit breaker if that meets with your design criteria.
A word of caution, however, the FP motor is very unhappy when running on the low RPM side of the curve. The internal fan is not very efficient at low RPM so the motor tends to over heat. This is normally not a problem if it weren't for the thermal breaker inside the motor. Once the motor temp is hot, the breaker trips and the motor stops for a period of time. Once the temp is elevated, each trip occurs at a lower current and there is a greater amount of time before reset.