With the bumper lights going on and off it sounds like you have a short and the PSX-AC is doing it's job. As I recall the PSX-AC defaults to automatic reset unless you add a momentary N.C. switch to a couple of it's pins. So the PSX is tripping and then resetting itself and tripping again because no one fixed the short.
The PSX-AC is an excellent breaker with many extra features. I have been using them for a few years now and would be glad to try and help you if you need it. The PSX instructions are pretty good though and explain all the settings and jumpers etc. pretty well.
