The LA9FK4H4G is a mechanical interlock from the TeSys F range, designed to prevent simultaneous closure of three vertically mounted contactors. It physically blocks the armature of one contactor when another is engaged, which is essential for reversing drives, star-delta starters, or any circuit where two contactors must never close at the same time. It interlocks contactors from the LC1F185 through LC1F500 range, including 2-, 3-, and 4-pole versions and the CR1F reversing contactor variants.
Integration notes
Mounts directly between the contactors in the vertical stack. No extra wiring — the interlock is purely mechanical, so it adds no control-circuit load or voltage drop. Verify the contactor order: bottom position takes the smallest frame (LC1F185–LC1F225), middle takes the mid frame (LC1F265–LC1F330), top takes the largest (LC1F500).