Fuse containing means responsive to large fault currents and means responsive to small continuous overloads

Claim 1

THE COMBINATION WITH AN OIL-FILLED TRANSFORMER OF WINDING MEANS, PROTECTOR MEANS FOR SAID WINDING MEANS IMMERSED AT LEAST PARTIALLY IN THE OIL AND COMPRISING A FUSE TUBE OPEN AT ONE END AND CLOSED AT THE OTHER END, A FUSIBLE ELEMENT DISPOSED WITHIN SAID FUSE TUBE AND HAVING A HEAT-SENSITIVE METALLIC ELEMENT SECURED TO ONE END THEREOF, SERIES RESISTANCE MEANS ELECTRICALLY CONNECTED IN SERIES WITH THE HEAT-SENSITIVE METALLIC ELEMENT AND THE FUSIBLE ELEMENT FOR CARRYING THE SERIES CURRENT OF THE PROTECTOR MEANS AND DISPOSED IN HEAT-TRANSMITTING RELATION TO SAID HEAT-SENSITIVE METALLIC ELEMENT, THE SERIES RESISTANCE MEANS INCLUDING A CYLINDRICAL RESISTANCE ELEMENT HAVING THE FUSIBLE ELEMENT PASSING THERETHROUGH AND HAVING THE HEAT-SENSITIVE METALLIC ELEMENT MOUNTED THEREIN, THE HEAT-SENSITIVE METALLIC ELEMENT METTING AT A PREDETERMINED TEMPERATURE AND ELECTRICALLY DISCONNECTING THE FUSIBLE ELEMENT FROM THE SERIES RESISTANCE MEANS, AND BIASING MEANS FOR URGING THE SERIES RESISTANCE MEANS TOWARD THE OPEN END OF SAID FUSE TUBE WHEN THE ELECTRICAL CIRCUIT THROUGH THE PROTECTOR MEANS IS BROKEN.