I know this isn't my thread, but wanted to give an update on my situations. I finally got around to installing a Siemens QF215A GFCI breaker in my GE load panel over the weekend. Although the Siemens breaker does fit in the box, I did need to temporally remove the breaker that was across from it in order to be able to install it. When trying to install the Siemens GFCI with the other breaker still in the end of the breaker where the line wires are inserted would contact the panels neural bus bars as the breaker is snapped in. However once the opposite breaker was removed the Siemens breaker installed without problems. With the Siemens breaker installed there wasn't any problems with reinstalling the other breaker. After installation was complete I flipped on the Siemens breaker and the motor started up normally and has been running that last couple of days without problems.