Founded in 2002, Shenzhen Jinrui Electronic Materials Co., Ltd. (referred to as Jinrui Company) is a national high-tech enterprise specializing in R&D, production and sales of Polymer PTC (referred to as PPTC). Jinrui Company has the technical background of the Institute of Metal Research of the Chinese Academy of Sciences (Shenyang), and independently developed the JK brand plug-in, conventional surface mount, low-resistance surface mount, ring, strip-type five series of PPTC self-recovery fuse products. There are nearly 1,200 product models with various pressure-resistant values ​​ranging from 6V to 600V. JKPPTC products currently cover many areas of electronic appliances.