Circuit protecting device

Claim 1

A CIRCUIT PROTECTING DEVICE COMPRISING, AN OSCILLATOR WHICH IS ELECTRICALLY ENERGIZED FROM AND TRANSMITS AN OUTPUT SIGNAL OVER A PAIR OF CONDUCTORS, SAID OSCILLATOR HAVING A PAIR OF ELEMENTS REQUIRING A MINIMUM VOLTAGE GRADIENT THEREBETWEEN WHEN SAID OSCILLATOR PRODUCES SAID OUTPUT SIGNAL, AN ELECTRICAL RESISTANCE ELEMENT ELECTRICALLY CONNECTED ACROSS SAID ELEMENTS, SAID RESISTANCE ELEMENT HAVING ONE END ELECTRICALLY CONNECTED TO ONE OF SAID CONDUCTORS AND THE OTHER END ELECTRICALLY CONNECTED TO A DEVICE TO BE PROTECTED TO VARY SAID VOLTAGE GRADIENT TO A VALUE BELOW SAID MINIMUM WHEN AN ELECTRICAL FAULT CURRENT FLOWS THERETHROUGH, A DETECTOR ELECTRICALLY CONNECTED TO CONTROL MEANS FOR CONTROLLING THE ELECTRICAL ENERGIZATION OF SAID CONDUCTORS, SAID DETECTORS BEING RESPONSIVE TO SAID SIGNAL OUTPUT TO ELECTRICALLY ENERGIZE SAID CONTROL MEANS, AND MEANS FOR ELECTRICALLY ENERGIZING SAID OSCILLATOR THROUGH SAID CONDUCTORS INDEPENDENTLY OF SAID CONTROL MEANS.