FIELD: power engineering. SUBSTANCE: method involves passing currents carried by all three phase conductors through fusible links of three fuses installed in electric circuits of these conductors; each fuse link is additionally heated by neutral-wire current passed through heating elements mounted inside fuse near its link. Heating elements are placed inside glass tube whose outer surface is coated with amalgam and functions as reflector. Heater is connected to neutral wire through additional contacts installed on washers which close fuse body. EFFECT: improved sensitivity of protective gear. 2 cl, 5 dwg
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