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This paper describes the design of a new product, conceived by the authors, part of a research contract and of a technological transfer, from university to the industrial market. It is a low voltage class C surge-arrester, based only on metal-oxide varistors, designed for low voltage residential equipment. Located in the indoor interior connection boxes, it could protect the whole installation against any type of occurring overvoltage (pulsed or long time one). The results of the applicative research were transfer...