Nanyang Jinguan Electric Co. Ltd. is one of the biggest professional manufacturer of metal oxide varistor (MOV) and Lightning surge arrester (MOA or LA) in China. We have been researching and developing metal oxide varistor since 1979, and have been manufacturing metal oxide varistor and Lightning surge arrester since 1983. Our company has obtained the quality system certification of ISO9001. All of our products have measured up to requirement of international electric technical standard IEC60099-4.