Self Retracting Lifeline
A self-retracting lifeline (SRL) is a fall-arrest connecting device with a drum-wound lifeline that pays out and retracts under slight tension during normal movement, then automatically locks at the onset of a fall to arrest the user. It is part of a personal fall arrest system (PFAS), used between the worker's harness and an anchorage, minimizing slack and reducing fall distance compared to conventional lanyards.
On a manufacturing or shop floor, SRLs are used where workers need mobility at height while tied off, such as accessing machinery platforms, mezzanines, elevated workstations, maintenance catwalks, or vertical access points. The housing is anchored overhead when possible, and the worker connects the line to the harness's dorsal D-ring; the line extends and retracts as the worker moves, then locks instantly if acceleration from a fall is detected. WorkSafeBC guidance indicates retractable lifelines should generally be used vertically unless the manufacturer specifically allows another orientation. For modern CSA-classified devices, selection must match the task: some SRLs are intended for vertical, overhead-anchored fall arrest, while leading-edge models are designed for situations where the line may contact an edge during a fall. In practical maintenance work, SRLs are often preferred over fixed-length lanyards because they reduce slack, improve movement efficiency, and can reduce required clearance if selected and installed correctly.
- Using the wrong SRL class for the hazard: a standard SRL may be unsuitable where the lifeline can contact an edge; leading-edge-capable SRLs are required for those conditions.
- Incorrect anchorage or geometry: anchoring too low or using the device in a configuration not allowed by the manufacturer can increase free-fall distance or defeat proper locking performance.
- Failing to remove from service after a fall or damage event: WorkSafeBC notes that after a fall, the manufacturer or authorized agent must inspect and approve the lifeline for continued use; continuing to use a deployed or suspect device is a major compliance and life-safety violation.
Is an SRL a fall restraint device or a fall arrest device?
It is fundamentally a fall arrest device, though some products and standards allow specific restraint applications when used within manufacturer limits.
Why does an SRL usually reduce arrest distance versus a lanyard?
Because the line remains taut during normal movement, there is less free slack to accelerate through before locking; the drum mechanism engages at fall onset.
What is the key performance feature during a fall?
The internal braking/locking mechanism arrests the drum almost immediately after detecting sudden acceleration, limiting the fall distance and arresting force within the device's design limits.