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Shenzhen Jinrui Electronic Materials Co., Ltd. (hereinafter referred to as Jinrui Company) was established in 2002 and is a national high-tech enterprise specializing in the research, development, production, and sales of polymeric Positive Temperature Coefficient (PPTC) thermistors. Jinrui Company has a technical background from the Institute of Metal Research of the Chinese Academy of Sciences (Shenyang) and independently develops five series of PPTC self-recovery fuses under the JK brand: plug-in, conventional surface mount, low resistance surface mount, ring, and strip. The product models include nearly 1200 types, with voltage ratings ranging from 6V to 600V. The JK PPTC products currently cover a wide range of electronic and electrical fields.