What is the difference between SRD and SRL?

What is the difference between SRD and SRL? 

The main differences between a Self-Retracting Device (SRD) and a Self-Retracting Lifeline (SRL) are in their design and application.

An SRL is specifically designed for fall protection, with a retractable lifeline attached to a worker's harness and an anchor point, primarily used to prevent falls from heights.

On the other hand, an SRD is a more general term that may refer to various devices with self-retracting features but not necessarily for fall protection. SRDs could be used in different contexts and might not have the same strict safety standards and features as an SRL.

For example, an SRL is crucial for workers on rooftops or scaffolds in construction sites, engineered to handle the forces of fall arrest, while an SRD could be something like a self-retracting cord for a tool without intended life-saving capabilities in case of a fall.

The key distinction is that SRLs are dedicated to safeguarding human lives during height-related work, while SRDs have broader and less specific uses.