A Comparative Study of Thermal Conductivity in ZnO- and SnO2-Based Varistor Systems

We performed a comparative study of electrical and thermal properties of ZnO- and SnO 2 -based varistor. The electrical properties of commercial ZnO-based varistor are equivalent to that found in SnO 2 -based varistor system. In spite of this, the SnO 2 showed a thermal conductivity higher than commercial samples of ZnO-based varistor, which allied with its simpler microstructure and lower dopant concentration is a remarkable result that point out to the use of this system to compete commercially with ZnO-based varistor devices.