Circuit protection devices

Details Circuit protection devices Circuit protection devices

1980-04-21

1982-09-28

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

219505, 219548, 338 22R, 361106, H01C 702, H01C 713

Patent

active

043520839

ABSTRACT:
Circuit protection devices which comprise two columnar electrodes and a conductive polymer element, at least a part of which is a PTC element. The device is so constructed that if a hot zone forms in the PTC element when current is passed through the device, it forms at a location away from the electrodes, thus increasing the useful life of the device. In one preferred embodiment, the conductive polymer element has an intermediate portion of increased resistance, thus causing the hot zone to be located at or near the intermediate portion. The intermediate portion may be of reduced size and/or be composed of conductive polymer of relatively high resistivity.

REFERENCES:
patent: 2978665 (1961-04-01), Vernet et al.
patent: 3243753 (1966-03-01), Kohler
patent: 3351882 (1967-11-01), Kohler et al.
patent: 3858144 (1974-12-01), Bedard et al.
patent: 4017715 (1977-04-01), Whitney et al.
patent: 4101862 (1978-07-01), Takagi et al.
patent: 4177376 (1979-12-01), Horsma et al.
patent: 4177446 (1979-12-01), Diaz
patent: 4200973 (1980-05-01), Farkas
patent: 4259657 (1981-03-01), Ishikawa

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