The LA9FK4K4F is a mechanical interlock from the TeSys F range, designed to physically prevent simultaneous closure of two contactors in a reversing or changeover configuration. It mounts in a 3-vertical position and interlocks bottom-mounted LC1F115...LC1F150 or CR1F150 3P/4P contactors with top- or middle-mounted LC1F500 or CR1F500 3P/4P units.
Integration Fit
The interlock is a mechanical-only accessory — no wiring, no coil draw. It clips onto the contactor bodies in the specified vertical stack. Verify the contactor frame sizes (LC1F115–LC1F150 and LC1F500) match the interlock's listed positions before ordering; the LA9FK4K4F is not a universal fit across the entire TeSys F family.