The Schneider LA9FK4G4G is a TeSys F mechanical interlock designed to physically prevent two contactors from closing simultaneously — a standard requirement for reversing motor starters or any circuit where simultaneous closure would create a phase-to-phase short. It mounts in a 3-vertical configuration and is compatible with bottom-position LC1F185…LC1F225 or CR1F185…CR1F225 contactors (3P or 4P), middle-position units of the same frame, and top-position LC1F500 (2P, 3P, or 4P) or CR1F500 (3P or 4P) contactors.
Single-unit package. The interlock is the complete mechanical assembly — no loose hardware to chase. The kit is complete as a single line item for the interlocking function between three vertically stacked contactors in the F frame range.