Common tripping breaker fix.
Electrical tidbit here. Not sure where to post this and I didn't see it listed. If your breaker trips shortly after the motor kicks in you might want to try replacing your standard breaker with a 'high magnetic' breaker. They have a delayed trip to allow for the high current draw when an electric motor starts. Changed my standard 20A breaker to a high magnetic breaker and my tripping problems went away. They are not sold in home centers or hardware stores. Got mine from Grainger.
Hope this helps.
Most important, what Bill said "Make sure the power supply is off!"