The LiftMaster LC36M41 Monitored Light Curtain is a commercial door safety device that creates a dense field of infrared beams across the doorway to detect people, vehicles, and equipment in the path of a moving door. With a 41-inch protective field, it provides expanded entrapment protection compared to single-point photo eyes, helping the operator stop and reverse when any beam is interrupted. Designed as a monitored non-contact safety solution, it supports UL 325 entrapment protection requirements when installed with a compatible LiftMaster commercial door operator. It is a smart upgrade or replacement for standard photo eyes on sectional doors, rolling steel doors, grilles, and other high-traffic openings in warehouses, loading docks, logistics, and parking facilities.
The LC36M41 connects to the operator’s monitored safety input and is powered by the operator’s low-voltage accessory supply, with continuous self-checking for proper function. Compatibility aligns with LiftMaster commercial operators that accept monitored photo-eye/light curtain inputs (such as Logic 5.0 and newer platforms); older non-monitored systems typically require an upgrade to a monitored input to use this device. Installation involves mounting the transmitter and receiver on opposing jambs at the correct height, aligning the beams using the built-in status indicators, wiring to the monitored safety terminals, and completing the operator’s safety device setup and test per UL 325 procedures. This monitored light curtain is intended for commercial and industrial applications where enhanced doorway coverage and dependable obstruction detection are required.