ELECTRIC FUSE HAVING GAS-EVOLVING MEANS FOR LIMITING BURNBACK

摘要

ELECTRIC FUSE HAVING GAS EVOLVING MEANSFOR LIMITING BURNBACKAbstract of DisclosureThe process of circuit interruption by an electric fuse canbe initiated either by a protracted overload, or by a major faultcurrent of large proportions. This invention is concerned withthe latter kind of fault currents.A substantially U-shaped gas-evolving structure is insertedbetween parallel rows of fusible elements. The two parallel armsof that structure are positioned close to the terminal elements ofthe fuse. A tie member interconnecting the two arms is positionedsubstantially out of the arcing zone and parallel to a generatrixof the fuse casing. On occurrence of a major fault current, thegas evolved from the arms protects the terminal elements of thefuse. It also tends to quench the follow current, i.e. the currentwhich flows through the hot fulgurite after a successful inter-ruption of a major fault current.-1-