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About Panasonic

Corporate History

Innovative Products
1968

Zinc oxide varistor ZNR



The world's first zinc oxide varistor was developed in 1968 by employing zinc oxide (ZnO) to make varistors (nonlinear resistor devices) for practical use. The theory behind the development was a pulse voltage suppression for practical use in TV receivers. Licensing agreements were made with leading world manufacturers, including General Electric and Westinghouse in the U.S. and Asea in Sweden. In addition, its application of protecting against lightning surges in semiconductor devices, made possible an advancement in the use of more electronic and semiconductor devices in home electric appliances, communications equipment, industrial machinery, and electrical machinery. It was also applied to lightning surge arrester devices in a wide range of fields, thus greatly contributing to improved reliability in lightning surge arresters.

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