I have a 20 amp breaker that tripped and won't reset. I suspect it's a bad breaker but wanted to hear some ideas/opinions/confirmation. I tried to reset the breaker and it immediately tripped again. When trying to reset it, it actually felt like the switch wasn't moving properly. I removed the black wire from the breaker and tried to reset it again and still no go. The switch is just sort of in the middle in the tripped position. If I push it either to the off or on position it just returns to the middle.
Here's what I think is the strange part. If I test the voltage with my multi-meter I'm getting 3 volts on the breaker terminal, when measured accross the neutral bus. Is this normal? All the other breakers seem to be working fine but one adjacent breaker also seems to show 3 volts even when turned off. Otherwise, everything in the house is working fine and I've been randomly measuring voltage at various outlets and get steady 120 readings everywhere.
My initial hunch is faulty breaker but any thoughts are welcome and appreciated.
Additional informaiton if it's helfpul - the panel is a Square D QO Load Center, probably installed sometime around 1970. Several breakers have been replaced, but the breaker in question is probably original.