In an integrated circuit for a ground fault circuit interrupting device, a power supply voltage regulator is utilized to turn on a double grounded neutral excitation oscillator and to inhibit trip initiating thyristor triggering while the half-wave rectified supply voltage is in regulation and, as the...http://www.google.ca/patents/US4348708?utm_source=gb-gplus-sharePatent US4348708 - Ground fault circuit interrupting device with improved coordination of electronic circuit operation
