Metal oxide varistor (MOVs, also called as Zinc oxide elements) , the heart of OTOWA’s SPDs and surge arresters, are manufactured under strict quality control. When an overvoltage such as a lightning surge is applied, it instantly changes from high impedance to low impedance. By becoming low impedance, overcurrents such as lightning currents can flow to the secondary side (grounding side, etc.), after which it automatically returns to high impedance immediately.
The MOVs used in surge arresters and surge protective devices (SPD) are manufactured under strict quality control and have excellent non-ohmic properties, high surge withstand capability and longer service life.