With convenient transportation and rapid economical development,?Ningbo Zhengmao Electronics Co., Ltd.?(with a former name Ningbo Shitong Telecommunication Component Factory) is located in the south of Ningbo Zhejiang Province, China. Founded in 2002, our company specializes in researching and manufacturing Switching Spark Gaps, Gas Discharge Tube and others.? The Breakdown voltage of Switching Spark Gap (SSG) mainly ranging from 110V to 1800V with many advantages including complete varieties, good stability and long lifetime (it can be switched for over thousands of times to millions of times). This product is mainly used for ignition on HID ballast, street lamps, gas cookers and central heating systems. etc. Gas Discharge Tube' Impulse discharge current resistance is good(3-electrode gas discharge tube parameter about 8/20μs can reach 25KA，High-power series parameter about 8/20μs can reach about 100KA), small capacitance and quick response. It is widely used for over-voltage protection of telecom and other electronics as well as lightning protection. Our company is a member under identification of Quality Management System (ISO9001-2008QMS). Our products all meet the International standard of IEC61643-311, Recommendation Standard of ITU-T K.12，European Standard EN61643-311, etc. Gas Discharge Tube is compliant with RoHS , also has been certified by German TüV, American、Canadian UL and SGS.? Based on Quality, we aim at satisfying our customers by continually improving our product quality and service to meet your needs.