Schneider Electric 77541-9999 Interlock Kit BC-3

Schneider Electric's Square D 77541-9999 BC-3 interlock kit is a Class 9999, Type BC-3 accessory for Size 0 and Size 1 disconnect assemblies. It provides a mechanical interlock between two handles in a BC-3 configuration, ensuring safe, interlocked operation by preventing one handle from being moved while the other is engaged. The BC-3 variant is part of Square D's interlock family and is intended for use with Size 0 and Size 1 frames within Class 9999 enclosures. Class 9999 interlock kits are documented to be suitable for enclosures rated for NEMA Type 1, 3R, and 12 environments, accommodating indoor and some outdoor installations. The 77541-9999 designation identifies this specific BC-3 kit within the 9999 catalog, offering a compact solution for small-frame interlock applications in dual-disconnect safety setups.