U.2.31
Date Code 20090715 User’s Guide SEL-421 Relay
Installation
Connection
Figure 2.26 SEL-421 Chassis Dimensions
Panel Mounting
Place the panel-mount versions of the SEL-421 in a switchboard panel. See
the drawings in Figure 2.26 for panel cut and drill dimensions (these
dimensions apply to both the horizontal and vertical panel-mount relay
versions). Use the supplied mounting hardware to attach the relay.
Connection
The SEL-421 is available in many different configurations, depending on the
number and type of control inputs, control outputs, and analog input
termination you specified at ordering. This subsection presents a
representative sample of relay rear-panel configurations and the connections
to these rear panels. Only horizontal chassis are shown; rear panels of vertical
chassis are identical to horizontal chassis rear panels for each of the 3U, 4U,
and 5U sizes.
When connecting the SEL-421, refer to your company plan for wire routing
and wire management. Be sure to use wire that is appropriate for your
installation with an insulation rating of at least 90°C.
Insufficiently rated insulation can
deteriorate under abnormal operating
conditions and cause equipment
damage. For external circuits, use
wiring of sufficiently rated insulation
that will not break down under
abnormal operating conditions.
Courtesy of NationalSwitchgear.com
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