Panduit FSDXL82-12-C ferrules with sleeves are designed to provide short circuit protection in terminal block and panel building applications. The seamless barrel and wider inside diameter sleeve create an air gap between the wire and the sleeve, preventing electrical arcs. These ferrules meet UL 486F, CSA-C22.2 No. 291-14, and DIN 46228 standards, ensuring color and single wire containment. They are ideal for wires with very thick insulation and should be installed with controlled cycle tools for consistent, high-quality terminations.