The Schneider Electric TeSys F LA9FL4H4G is a mechanical interlock accessory that prevents two or three contactors from being energized simultaneously — a standard requirement for reversing starters, star-delta transitions, or any circuit where simultaneous closure would create a phase-to-phase short. It mounts in a 3-vertical configuration and is designed to interlock specific TeSys F contactors: bottom-position LC1F185 through LC1F225 (3P or 4P) and CR1F185 (3P or 4P); middle-position LC1F265 through LC1F330 (3P or 4P) and CR1F265 (3P or 4P); top-position LC1F630 (3P or 4P), LC1F800 (3P), and CR1F630 (3P or 4P). This is a purely mechanical interlock — no electrical coil or auxiliary contacts — so it adds no load to the control circuit and introduces no electrical failure mode. The mechanical linkage physically blocks the opposing contactor's armature from closing.
Integration Notes
Mounts directly onto the contactor's front face without additional hardware. The 3-vertical orientation means the interlock bar runs along the three stacked contactors, so panel layout must account for the vertical alignment. No DIN-rail space consumed beyond the contactors themselves. Single unit per package — order one LA9FL4H4G per set of three contactors to be interlocked.