Schweitzer Engineering Laboratories SEL-421-4 - Figure 2.1 Horizontal Front-Panel Template (A); Vertical Front-Panel Template

2.3
Date Code 20171021 Instruction Manual SEL-421 Relay
Installation
Shared Configuration Attributes
Rear Panels
Rear panels are identical for the horizontal and the vertical configurations of the
relay. Figure 2.2 is an example of a rear panel for a 3U relay with fixed terminal
block analog inputs. Figure 2.3 shows a rear panel for a 3U relay with Connector-
ized analog inputs. See Rear-Panel Layout on page 2.26 for representative 3U,
4U, and 5U relay rear panels (large drawings are in Figure 2.24–Figure 2.32).
Figure 2.1 Horizontal Front-Panel Template (a); Vertical Front-Panel Template (b)
Operator
Control
Labels
Target
LED
Label
Opening
(a) (b)
Opening
Target
LED
Label
Opening
Operator
Control
Labels