Spiral wound shunt type slow blow fuse

Details Spiral wound shunt type slow blow fuse Spiral wound shunt type slow blow fuse

H - Electricity

01

H

306/157

H01H 85/04 (2006.01) H01H 85/055 (2006.01)

Patent

CA 1246128

9179-13 ABSTRACT A slow blow fuse of the shunt type includes a pair of spaced terminals between which is connected and suspended a fuse wire assembly including a core of insulating material having at least a pair of fuse filaments upon the same, the outer of which is preferably an untinned spirally wound filament wrapped a number of times around one and more preferably at least two straight filaments, only one of which is tin plated, extending axially along the core. The uncoated spirally wound filament thus makes repeated physical and axial spaced electrical contact with the tinned filament. There are thus at least two fuse filaments in electrical parallel relation at a number of different locations therealong, each sharing a layer of tin coating. Each of the fuse filaments comprises a body of base metal which will melt instantly under short circuit current and is to melt under prolonged modest overload currents when the melting temperature lowering tinning material progressively migrates fully into the base metal body of the fuse filaments.

490119

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