Fusible resistor
AssigneeErie Electronics Limited
InventorsColin Dennis, Arthur Denys Holt, Patrick William Henry Moore
Life of this patent
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Abstract
A fusible resistor has a substrate on which two terminal paths are formed. A resistor in the form of an area of resistive material deposited onto the substrate extends between the terminal paths. The expected line of fracture of the substrate, upon a current flowing through the resistor such that the rate wattage is exceeded, crosses at least one of the terminal paths. Desirably at least one line or zone of weakness is formed in the substrate.
Claims10
A fuse comprising a substrate, two terminal paths of conductive material formed on said substrate, and a resistor carried by said substrate and extending between said terminal paths, said resistor constructed to form a line of maximum thermal stress in said substrate upon a current passing through said resistor which line of maximum thermal stress in turn defines an expected line of fracture of said substrate such that the substrate fractures nearly along said expected line of fracture when the rated wattage for the fuse is exceeded, wherein at least one of said terminal paths includes a first portion adjacent and contacting said resistor and a second portion spaced from said first portion so that an area of the substrate separates said first and second portions of said terminal path, and wherein said expected line of fracture respectively crosses said first portion of said last mentioned terminal path, said area of said substrate and said second portion of said last mentioned terminal path.
Dependencies are inferred from the claim text.