The Burndy (KK3A40U-4N) 350-800 kcmil Dual Rated Universal Mechanical Bolted Lug & Terminal is a heavy-duty electrical connector designed to provide a reliable connection for large conductors ranging from 350 kcmil to 800 kcmil. To use, strip the insulation from the wire ends and insert them into the terminal's appropriate conductor hole. Secure the wires by tightening the mechanical bolts, ensuring a firm connection and preventing any loosening over time. This dual-rated terminal is suitable for both aluminum and copper conductors, offering flexibility in various installations. It is commonly used in industrial, commercial, and utility applications where high-capacity, durable connections are required for large wire sizes.