Power-saving joints are made of electrical grade pure copper with high mechanical strength and good electrical conductivity, with novel and reasonable structure, and the surface is plated with rare metals. It is an ideal replacement product for the commonly used DT, DL, DTL series terminal blocks and STL copper-aluminum transition equipment clips, and has been recognized as a national new technology product by the State Economic and Trade Commission. Used for power transformers, asynchronous motors, synchronous motors, voltage transformers, current transformers, power capacitors, power meters, drop fuses, lightning rods, oil switches, air switches, circuit breaker contactors, power factor compensation cabinets, AC and DC Power distribution panels, wire and cable connections, etc.There is a section of internal thread and a section of inner cone surface in the sleeve, which are used to cover the tightening end on the encapsulation end, and lock the cable inserted in the encapsulation end by tightening the nut. The utility model has the advantages of energy saving and consumption reduction, saving national non-ferrous metal resources, small size, light weight, low cost, durability, safety and reliability, low resistance, low temperature rise, large pulling force and the like.