Limited protection in Shanghai Changyuan Weian electronic line (CYG Wayon Circuit Protection Co., Ltd.), by the Shanghai Material Research Institute was founded in 1996 2007, the Shanghai Stock Exchange listed company is the controlling shareholder of Changyuan group. To promote the "technological innovation" and "internationalization" strategy firm Changyuan Weian, already by a development of the localization of science and technology enterprises grasp the polymer overcurrent protection devices of PPTC core technology has become the field of electronic circuit protection of the global core suppliers, to provide electronic line protection solutions for customers.