ПРЕДОХРАНИТЕЛЬ

摘要

FIELD: electrical engineering; overvoltage protection of power mains. ^ SUBSTANCE: proposed electric fuse has internal electricity conducting metal member and external electricity conducting member joined to the latter on surface and electrically insulated therefrom; external conducting member is made of material whose temperature of volumetric expansion is lower than that of internal member. External member is designed for opening electric circuit in response to internal member heating. External conducting member can be designed to reclose electric circuit upon its opening. ^ EFFECT: enhanced speed of fuse response. ^ 3 cl, 3 dwg