Lightning arrester isolator devices

Claim 1

THE COMBINATION OF A LIGHTNING ARRESTER HAVING ONE END CONNECTED TO A POWER LINE AND A CIRCUIT INTERRUPTER IN SERIES WITH THE OTHER END OF SAID LIGHTNING ARRESTER, WHEREIN SAID CIRCUIT INTERRUPTER COMPRISES A PAIR OF SPACED APART TERMINALS DEFINING A SPARK GAP THEREINBETWEEN, A HOUSING HOLDING SAID TERMINALS IN RELEASABLE SPACED APART RELATION, ONE OF SAID TERMINALS HAVING AN AXIAL BORE AND THE OTHER OF SAID TERMINALS BEING RECEIVED IN SAID AXIAL BORE, AN EXPLOSIVE CARTRIDGE SECURED TO SAID OTHER TERMINAL WITHIN SAID HOUSING AND ADJACENT SAID ONE TERMINAL, AND MEANS IN SUBSTANTIALLY SURROUNDING RELATION TO SAID TERMINALS FOR PROVIDING A CAPACITANCE IN SHUNT TO SAID SPARK GAP, SAID CAPACITANCE BEING FORMED BETWEEN ELECTRODES OF HIGH CONDUCTIVITY SEPARATED BY A DIELECTRIC OF RELATIVELY HIGH DIELECTRIC CONSTANT, WHEREBY LEAKAGE CURRENTS ARE NORMALLY BY-PASSED AROUND SAID EXPLOSIVE CARTRIDGE AND DETERIORATION OF SAID CARTRIDGE DUE TO TEMPERATURE BUILDUP RESULTING FROM SAID LEAKAGE CURRENTS, ARCING OVER SAID GAP IS ELIMINATED, SAID CAPACITANCE LIMITING THE VOLTAGE ACROSS SAID SPARK GAP, RESULTING FROM THE FLOW OF POWER LINE FREQUENCY LEAKAGE CURRENT THROUGH SAID CAPACITANCE, TO A MAGNITUDE BELOW THE POWER LINE FREQUENCY SPARKOVER POTENTIAL OF SAID SPARK GAP.