BNC240 is a 1-meter-long polycarbonate dust cover designed for the lower-deck terminals of double-deck terminal blocks in the BN-W/BNH-W series. It is specifically compatible with double-deck terminal blocks such as BND(H)15W and BND(H)15WT, providing protection against dust and contamination. The cover features a groove-based installation system that allows it to be pressed into the lower end and pushed into the top end for secure mounting. The material is polycarbonate, offering durability and transparency for visual inspection. This accessory is commonly used in industrial control panels and electrical distribution systems to maintain terminal cleanliness and safety in harsh environments.