Trip devices for electric fuses

Claim 1

IN A HIGH VOLTAGE POWDER FILLED ELECTRIC FUSE FOR LIMITING ELECTRIC CURRENT HAVING AN OUTER CASING, TERMINAL END CAPS CLOSING THE ENDS OF SAID OUTER CASING, AND A PLURALITY OF FUSIBLE ELEMENTS FOR INTERCONNECTING SAID END CAPS, THE IMPROVEMENT OF A TRIP DEVICE COMPRISING AN AUXILIARY CASING FITTED AT ONE END OF SAID OUTER CASING, TERMINAL MEANS FOR MOUNTING SAID AUXILIARY CASING ON ONE OF SAID END CAPS, AT LEAST ONE OF SAID FUSIBLE ELEMENTS BEING CONNECTED TO SAID TERMINAL MEANS, A STRIKER PIN HOUSED WITHIN SAID AUXILARY CASING, A CHARGE OF GAS-PRODUCING MATERIAL WITHIN SAID AUXILIARY CASING FOR ACTUATING SAID STRIKER PIN, AN ACTUATING WIRE IN CONTACT WITH SAID GAS-PRODUCING MATERIAL, SAID WIRE BEING CONNECTED TO A SHUNTED PART OF THE LENGTH OF SAID ONE OF SAID FUSIBLE ELEMENTS BETWEEN AN INTERMEDIATE POINT AND SAID TERMINAL MEANS, AND A PORTION OF LOW MELTING POINT METAL FIXED TO SAID SHUNTED PART OF SAID ONE FUSIBLE ELEMENT TO EFFECT ALLOYING FOR INTERRUPTION OF THE ELECTRICAL CURRENT THROUGH SAID SHUNTED PART OF SAID ONE FUSIBLE ELEMENT TO UNDER OVERCURRENT CONDITIONS WHEREBY TO DIVERT ELECTRIC CURRENT THROUGH SAID ACTUATING WIRE TO ACTIVATE SAID CHARGE OF GAS-PRODUCING MATERIAL SO AS TO ACTUATE SAID STRIKER PIN, SAID METAL PORTION BEING AT A POINT IN HEAT TRANSFERRING RELATION TO SAID TERMINAL MEANS SO THAT HEAT IS ABSORBED FROM SAID METAL PORTION TO PREVENT PREMATURE INTERRUPTION OF THE CURRENT THROUGH SAID SHUNTED PART.