ACSR (Aluminum Conductor Steel Reinforced) is a type of high-capacity, high-strength stranded conductor. It consists of a solid or stranded steel core surrounded by layers of high-purity aluminum wires. This design is widely used because it combines the best properties of both materials: the high conductivity and light weight of aluminum for efficient power flow, and the high tensile strength of steel to support the conductor's weight over long spans and withstand mechanical stress from wind and ice.