Our company is the biggest professional work of manufacturing metal oxide varistors (MOV) and metal oxide surge arresters (MOA) in China. Our company have been researching and developing these products since 1979, and have been manufacturing these since 1983. At present, we can produce 4. 6 million pieces of varistors (diameter from 32mm to 138mm) and 500 thousand sets of surge arresters from 6kV to 500kV in a year. Our company has obtained the conformity certificate of quality system certification of ISO9001 and KEMA test report.