4
;
Always ensure you are using the latest revision of your 3M instruction manual. Visit www.3m.com/userinstructions or
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 1 Self-Retracting Device (Figures 1 and 2):
Class 1 Self-Retracting Devices (SRDs) are suitable for
applications where the lifeline remains generally vertical during use. 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 its mounting point and is connected to the SRD by means
of the Swivel Eye (E). The Bottom Connector (C) is secured at the end of the Lifeline. Depending on system configuration, the
Bottom Connector will attach to either the designated attachment element of the user’s full body harness or to the system’s
anchorage point. Energy Absorbers (F) dissipate kinetic energy and limit deceleration forces during fall arrest.
SRD models are available in single-SRD and twin-SRD configurations. Twin-SRD models (Figure 2.4) 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.
;
Twin Connections shall only be made for the purposes of 100% tie-off transitions
Figure 2.2 shows models that have an alternate swivel (G) for securing the Top Connector (D). These models should only be
installed with the Top Connector(D) attached to an overhead anchorage point.
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
C
F
A
B
E
D
A
C
F
B
E
D
A
C
F
B
G
D
A
C
F
B
E
D
1
2
3
4
