LiftMaster Rolling Door Interlock Switch | LIF-50-12949 Ritron Our product includes a power

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LiftMaster Rolling Door Interlock Switch | LIF-50-12949 Ritron Our product includes a powerLiftMaster Rolling Door Interlock Switch LIF 50 12949 NEMA 1 switch is engaged by rolling door lock mechanism and disables operator control circuit when door is locked, preventing electrical operation of door when locked. Mounts at bottom of door guide, requires 2 wire connection to operator. May be used with all LiftMaster industrial operators on rolling doors. Also known as: 50 4001R 50 4001L