LiftMaster Safety Devices
LiftMaster monitored resistive edges are aluminum-channel safety edges for gate operators, IP65 rated and, per LiftMaster, designed to meet UL 325, in large and small profiles from 4 to 6 ft.
About LiftMaster Safety Devices (Edges, Loop Detectors, Sensors)
Sensing edges are a common way to add monitored entrapment protection along the edge of an automated gate. LiftMaster's monitored resistive edges use an aluminum channel, mount vertically or horizontally, carry an IP65 rating and meet UL 325, per the manufacturer. They operate from -40 to 65 C.
Large profile edges come in 4 ft (L504AL), 5 ft (L505AL) and 6 ft (L506AL) lengths, and small profile edges come in 4 ft (S504AL) and 6 ft (S506AL). The S50E ends kit finishes the edge. Related items include the G714167NH plug-in loop detector board and the PRE-SENSOR trailer presence sensor, which is for the DDO8900W dock door operator only.
For a quote, list the operator model, gate type, and the edge lengths and profiles needed at each opening, plus any loop detector boards.

Colors, sizes and specifications
Sizes and configurations
- Large profile: 4 ft (L504AL), 5 ft (L505AL), 6 ft (L506AL); small profile: 4 ft (S504AL), 6 ft (S506AL)
Models
- Monitored resistive edges L504AL, L505AL, L506AL, S504AL and S506AL, plus S50E ends kit
Features
- Mounts vertically or horizontally
- IP65 rated
- Designed to meet UL 325, per LiftMaster
Specifications
| Operating temperature | -40 to 65 C |
|---|---|
| Channel | Aluminum |
Accessories and works with
- Ends kit S50E
- G714167NH plug-in loop detector board
- PRE-SENSOR trailer presence sensor (dock door operator DDO8900W only)
Best for
- Business safety and security
LiftMaster Safety Devices (Edges, Loop Detectors, Sensors) photos
One product or the whole package
Order this on its own, with a few related products, or with everything else for the project. One itemized quote, shipped to all 50 states. Need someone to install it? Find an installer serving your area.
Request a quote for LiftMaster Safety Devices
Send plans, measurements, or photos and we will prepare an itemized quote. You can also call us with questions.



