H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/147
H01H 85/30 (2006.01)
Patent
CA 1292029
ABSTRACT OF THE DISCLOSURE This invention relates to an operation-indica- ting device for fuse cartridges for electrical protec- tion, of the type comprising a plunger formed by a pusher element which is retained against elastic actuating means by a secondary fuse wire connected in parallel with the wire or wires or fusible elements of the cartridge, characterized in that it comprises, at the level of the base of the plunger which coope- rates with the conventional portion of reduced section of the secondary wire, an intermediate piece which is in contact with said wire on either side of said portion and which is arranged so as to behave, on the one hand, in non-conductive manner with respect to the low-voltage current which Passes through this wire when the cartridge is traversed by the nominal current, thus allowing fusion of said portion as soon as the principal fuses have melted, on the other hand, in conductive manner, simultaneously to this break, consequently ensuring, in the manner of a shunt, the transmission of the high-voltage current to the two parts of the secondary wire disposed on either side of the portion of reduced section, and this up to virtually total fusion of said two parts.
589515
"ferraz" A. French Societe Anonyme
Macrae & Co.
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