[spreerider]

GFCI Breaker has to be able to trip on overcurrent but a duplex recepticle one will not, i thought we were talking about a breaker in the pannel one IMO they are way higher quality.

Also depending on what is downstream of the GFCI can affect it possibly in another room depending on how the house is wired, I did some work on a house that had the GFCI in the bathroom tripping all the time, it turned out it was a motion security light that the homeowner had installed and taken power from the bathroom as it was the closest source, evertime the light turned on it tripped the GFCI.

GFCI have a coil around both hot and neutral connections and a voltage will be generated in the coil if hot and neutral are not equal, this means that somewhere there is a fault some current must be leaking through ground and not neutral, they dont actually measure current through the ground.