The LiftMaster CPS-N4 Commercial Protector System is a two-piece, opposed-beam infrared photo eye set designed to provide non-contact entrapment protection for commercial and industrial door operators. Housed in rugged NEMA 4 enclosures, these photo eyes are engineered for harsh, wet, or dusty environments such as car washes, agricultural facilities, parking structures, and loading docks. When installed across the door opening and properly aligned, the CPS-N4 creates a safety beam that, when interrupted, signals the operator to stop or reverse the door, helping protect people, vehicles, and equipment. It’s a reliable replacement part or upgrade for commercial garage door systems that need durable, wet‑location safety sensors.
This hard‑wired emitter/receiver pair integrates with LiftMaster commercial door operators via the operator’s safety input terminals, drawing power from the control board so no separate supply is typically required. The NEMA 4 rating supports indoor/outdoor applications and wash‑down conditions, and the opposed through‑beam design offers consistent detection across standard door openings. For UL 325 compliance on newer operators that require monitored primary entrapment protection, confirm your control board’s requirements; many Logic 5.0 models specify a monitored photo eye such as the LiftMaster CPS-U or CPS-RPEN4 for the primary device, while the CPS-N4 may be used as an ancillary sensor or on compatible non‑monitored systems. Follow the operator manual for mounting height, wiring, and alignment procedures to ensure proper operation and to maintain safety standards.