Schneider Electric's Square D 9999-R43 electrical interlock is a single-pole interlock kit in the Class 9999 family, designed to be used with compatible disconnect switches or circuit breakers to enforce safe sequencing between devices. It provides mechanical and electrical interlock capabilities to prevent conflicting operations in safety-critical control circuits. Listed as Type R43 for single-pole interlock configurations, this kit is intended for use with Square D equipment that supports 9999 interlock accessories to help maintain proper isolation and operator safety in industrial panels.
