Voltage-dependent resistor

Details Voltage-dependent resistor Voltage-dependent resistor

1986-01-13

1987-06-23

Hartary, Joseph W.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

H01C 710

Patent

active

046756442

ABSTRACT:
A voltage-dependent resistor or varistor is composed of a monolithic ceramic body made up of a plurality of layers of varistor material containing zinc oxide, alternating with layers of precious metal serving as coatings on the layers and which are alternatingly electrically connected to separate locations on the exterior surfaces of the body. The porosity of the layers of varistor material does not exceed 5%; the proportion of bismuth is at most 1 mol %; and the precious metal coatings include 50-80% by weight of palladium.

REFERENCES:
patent: 2736080 (1956-02-01), Walker et al.
patent: 3235939 (1966-02-01), Rodriguez et al.
patent: 4290041 (1981-09-01), Utsumi et al.
Properties of Multilayer ZnO Ceramic Varistors by N. Shohata, T. Matsumura, K. Utsumi & T. Ohno, American Ceramic Society, 1981, vol. 1, pp. 349-358.
Microstructure, Electrical Properties, & Failure Prediction in Low Clamping Voltage Zinc Oxide Varistors by L. Bowen & F. J. Avella, Journal of Applied Physics, No. 54, May 5, 1983, pp. 2764-2772.
Edelgasgefullte Uberspannungsableiter; Metalalloxid-Varistoren SIOV, Nov. 4, 1984, pp. 44-65, Siemens brochure.

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