DTL series of copper-aluminum wiring terminals are suitable for transition connection of the circular aluminum wires, hemicycle-sector aluminum wire, power supply cables in the distribution equipment and copper terminal s of the electric equipment . The material of aluminum and copper  is that of L3 and T2 respectively. The technology of friction welding is wonderfully adopted. Therefore they have distinguishing features of strong weld intensity, good nature in electrification, resistant galvanic corrosion and long service life.