Ningbo Zhengmao Electronics Co., Ltd. is located in Ningbo, a port city in Zhejiang Province, China. Our company is specialized in researching and developing, producing, and selling of components used in telecommunication, electron and electric power. We can supply all types and standards of metal ceramic gas discharge tubes and switching spark gaps. Our company has a building covering an area of more than 6,000 square meters. Our facilities and testing equipment are advanced using high technology.

Our ceramic gas discharge tube's varieties and standards are very complete with strong current. With current resistance, small capacitance, rapid response, discharge voltage stabilization, this product has no light sensation effect and does not contain any radioactive material. It is an optimal lightning strike and over-voltage protection device which is widely applied to telecommunication fitting exchange equipment, telephone sets, electrical equipment and surge protection for power distribution system. Switching spark gaps have more extensive applications.

Our products satisfy the ITU-T K.12 recommended standard and the technical requirements stipulated in BSEN61643-311:2001. Our company has got certificate of ISO9001 and our gas discharge tube has won TUV certification issued by German TUV. Meanwhile, we are always ready to design and manufacture all kinds of discharge tubes and switching spark gaps of different outline dimensions, current grades, performance index and operation requirements, specifications and models for new and old customers.