It adopts flame-retardant reinforced engineering plastic shell, excellent material selection, novel and unique shape, high structural strength, chemical resistance, aging resistance, and impact resistance. Split joints with stable performance, easy to make double joints or multiple joints. Safe to use, internal use KACON/OMRON micro switch and gold alloy contacts completely sealed in the shell, contact sensitive, ensure that the waterproof, dustproof and oil-proof reach IP68, conform to IEC/EN60529 standard, long life, 30 million mechanical life More than 200,000 times of electrical life. It is suitable for the control of industrial machinery such as forging, handling, textile welding, medical treatment, testing, and automated production lines.