You're referring to the house circuit breaker? you give that PCB too much credit ... I guess I'm not surprised that the system works ... they do have some wide traces on that PCB for powering the motor, but it's not ... at least in my experience ... very common nor normal to have 120V AC with some amperage in it actually on a PCB ... these things are best done with wire only and relays mounted in external enclosures as they are under the hood of a car... I've posted my pics and the detail of what I found on a electronics forum and ive gotten some very good responses ... one person suggested putting a 100 watt light bulb in series with the motor and then plug it in to see if it will spin .. I thought of perhaps using a light switch dimmer turned all the way down, then applying power and slowly turning it up while watching an in series amp meter to see if the motor quickly begins to draw too much current....Circuit breaker.
Another person thought that maybe the solder joint on the relay was just weak and it couldn't handle a normal motor start condition which is a dead short for a few fractions of a second as is the case with any motor that you initially apply power to ... and if he's correct, then the solution to this problem will simply be some creative repair work on the board with my iron, solder, and extra copper that I have laying around to strengthen those PCB connections where 120 is being routed so that this never happens again.
What I wanted to say (but got side tracked) is that if there was ever enough juice running through those traces on the PCB on a level that would trip a house breaker ... I can guarantee you that the PCB traces would vanish off the board before that breaker would ever get tripped ... electricity seeks the path of least resistance and that circuit breaker is going to have a lot less resistance than those PCB traces will have.