Patent ID: 6625551
Filing Date: 2003-09-23
Classification: H02H

Abstract:
A fault or differential current detection software program contained in a computer readable medium, wherein the fault or differential current detection software program includes instructions to instruct a controller to perform a routine comprising:(a) determining if a detected current generated on a conductor is greater than or equal to a first predetermined current threshold based on a detection signal corresponding to said detected current; (b) refraining from outputting a control signal for a predetermined delay period after said detected current is greater than or equal to said first predetermined threshold; (c) determining if said detected current is greater than or equal to a second predetermined current threshold after said predetermined delay period is over; (d) determining if said detected current is a fault or differential current after said detected current is greater than or equal to said second predetermined current threshold; and (e) when said detected current is said fault or differential current, outputting said control signal at least indirectly to a switch to instruct said switch to isolate said fault current from an electric device connected to said conductor.