Founded in 1999, Shenzhen Sembo Electronics is one of the largest manufacturers of surge protection products in China.  Sembo has factories located in Shenzhen, Anhui, Donggun and Huizhou China. Their vast product line includes Gas Discharge Tubes, Sparkgaps, Thyristor Surge Suppressors, Transient Voltage Suppressor Diodes, Electrostatic Discharge Diodes, Metal Oxide Varistors, Multi-Layer Varistors, Positive Temperature Coefficient resettable fuses, NTC Thermistors, and Surge Protection Modules.