Schneider Electric 9999R-4 Snap Switch Interlock

Schneider Electric's Square D 9999R-4 Snap Switch Interlock is an electrical interlock kit designed to install inside compatible Square D safety switches, coordinating the door mechanism with a snap-action interlock switch to enhance operator safety. The 9999R-4 interlock employs a snap switch element to enforce the interlock sequence so that access to the main disconnect is controlled and exposure to live parts is minimized during servicing. As part of Schneider Electric's 9999 interlock family, this kit is intended for use with Type S safety switches in suitable sizes, and it integrates with the switch mounting hardware to form a complete interlock solution inside industrial control panels. Typical applications include heavy-duty safety switch installations in manufacturing facilities, warehouses, and process plants where lockout and restricted access are required to maintain safety compliance, and it commonly supports interlock configurations in panels that require consistent, repeatable safety practices across multiple enclosures. The 9999R-4 interlock can be paired with other 9999 components to deliver a scalable interlock configuration for Square D safety switches, enabling cohesive safety systems in industrial environments.