The TeSys LA9FK4H4F is a mechanical interlock accessory for the TeSys F contactor series. It physically prevents two contactors from closing simultaneously — a requirement for reversing drives, motor bypass circuits, or any load that must never see a phase-to-phase short through the contactor pair. This version is configured for three vertically stacked contactors. The interlock bar couples the moving contacts so that only one of the three can be in the closed position at any time.
Which contactors it fits
Bottom position accepts LC1F115 through LC1F150 or CR1F150 (3 or 4 pole). Middle position accepts LC1F265 through LC1F330 or CR1F265 (3 or 4 pole). Top position accepts LC1F500 or CR1F500 (2, 3, or 4 pole).
Sourcing reality — obsolete
Schneider has marked the LA9FK4H4F as obsolete. No direct factory replacement order code is listed.