3
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contact 3M Technical Services for updated instruction manuals.
PRODUCT OVERVIEW:
Figure 1 illustrates the product models covered by this instruction. Self-Retracting Devices (SRDs) are drum-wound lifelines that
retract into solid housings.
The following SRD types are covered by this instruction:
• Class 2 Self-Retracting Device with Leading Edge (Figure 2):
Class 2 Self-Retracting Devices with Leading Edge
(SRD-LEs) are suitable for applications where the lifeline remains generally horizontal during use. SRD-LEs have an
integral energy absorber to withstand impact loading of the lifeline over a sharp or abrasive edge during fall arrest and
minimize fall arrest forces on the user. This type may be used for Fall Arrest or Restraint applications.
Figure 2 identifies key components of the available SRD models. In a standard SRD, the Lifeline (A) extends and retracts from
within the Housing (B). The Top Connector (D) secures the SRD to the designated attachment element of the user’s full body
harness and is connected to the SRD by means of the Swivel (E). The Bottom Connector (C) is secured at the end of the Lifeline
and will attach to the anchorage point. Energy Absorbers (F) dissapate kenetic energy and limit deceleration forces during fall
arrest.
SRD models are available in single-SRD and twin-SRD configurations. Twin-SRD models include a single Top Connector (D) to be
shared between the two SRDs. These connectors are designed to interface with harnesses so that the Twin-SRD model may be
worn on the user’s back. Twin-SRD models may be used to maintain 100-percent tie-off when transferring between anchorage
points.
Each product model has its own particular size and its own combination of components as listed in Figure 1. See Table 1 for
more information on Component Specifications.
Figure 2 - Components
F
E
A
C
D
B
