Professional Answer: As a manufacturer specializing in power line equipment, we understand the critical differences between these conductor types. AAC (All Aluminum Conductor) is made entirely of aluminum wires and is valued for its lightweight nature and high conductivity. It is typically used for low to medium voltage distribution lines where spans are shorter. AAAC (All Aluminum Alloy Conductor) uses a high-strength aluminum alloy. This provides better strength-to-weight ratio and improved corrosion resistance compared to AAC, making it suitable for longer spans and a wider range of applications. ACSR (Aluminum Conductor Steel Reinforced) is the most common type for high-voltage transmission lines. It features a central steel core for high mechanical strength and an outer layer of aluminum for conductivity. The steel core allows it to withstand higher tensions and longer spans, making it ideal for long-distance power transmission.