SHANGHAI CHENZHU INSTRUMENT CO., LTD was established in 2002, which originated from Shanghai automation instrument institute, specialized in isolated barriers, signal isolators, Surge Protective Devices and safety relays etc. integrating research and development, manufacturing and sales, providing OEM/ODM service and self-brand product. 2013, we launched the first One million pcs product and announced 5 years guarantee. Actually, we have 4 certifications which were the first one in instrumentation industry domestic China, such as IECEx Certificate, Europe ATEX Certificate by DNV, SIL from TUV Rheinland, and Japan TIIS Ex-proof Certificate. CHENZHU's factory has 2 SMT production line, over 4.5 million pcs products were sold from 2002 till end of 2017.