Hi there....
If this is the AC Input Circuit Breaker it should be rated at 115vAC or 230vAC at 8Amps or higher. Actually more like 12 Amps or better.
Your treadmill motor will require more than the ratings you listed. You should have a 2.75hp motor in it, which will need a fairly hefty breaker on the AC Input.
How do you know this breaker is bad? Always trips? Reads open with a meter?
doctronics, April 2009