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There is a contactor in the AC interrupt circuit and a small 7.5 amp breaker in the control box, and a tiny third breaker on the right side of the "push to test lamp module". Which one is opening? If the one on the lamp module is going, then that is fairly normal if one draws too much...

What that light is telling you is that the current going through the current transformer(s) exceeds the allowed current. That black box on the far left inside the control box is controlling this. The current transformer is that grey thing-a-ma-bob that has three sets of wires wrapped through...