Insulated Knife Switch | 34-Yr Expertise, CE/ISO Certified

The insulated knife switch is a fundamental component in low-voltage power distribution, providing a visible break in the circuit for maintenance and emergency isolation. At ZHNYU ELECTRIC, we have refined the design and manufacturing of insulated knife switches since 1992, integrating R&D, production, and sales under one roof. Our production process begins with high-precision molding of insulating housings using flame-retardant, high-CTI thermoplastics that withstand harsh environments. Copper contacts are stamped, silver-plated, and assembled with strict torque control to ensure low contact resistance and high mechanical endurance. Every insulated knife switch undergoes 100% routine testing, including dielectric strength, temperature rise, and 10,000-operation mechanical life tests. With 100+ production equipment and ISO9001-certified quality management, we achieve a defect rate below 0.2%. Our insulated knife switches are widely applied in power distribution, industrial control, and new energy fields, serving power, construction, photovoltaic, petroleum, chemical, metallurgical, and railway industries.