Self-resetting overcurrent protection element

Details Self-resetting overcurrent protection element Self-resetting overcurrent protection element

1991-06-03

1993-05-11

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338226, 338275, 338276, 338322, 338324, 338327, 338328, H01C 710, H01C 114

Patent

active

052105172

ABSTRACT:
A self-resetting overcurrent protection element uses an element body made up of a mixture of polymers and carbon black grafted with polymers. A resilient sheathing material covering the element body permits free expansion of the element body to permit the resistance of the overcurrent protection element to increase substantially in response to Joule's heating from high current. The sheathing materials preferably are made of elastic epoxy resins or silicone resins that allow significant expansion of the element body at the time of overcurrent protection, thus increasing the ratio of resistance in the element between an overcurrent state and a normal operating state.

REFERENCES:
patent: 4873507 (1989-10-01), Antonas

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