Sel SEL-421 - Page 94

U.2.34
SEL-421/SEL-421-1 Relay User’s Guide Date Code 20020501
Installation
Connection
Figure 2.21 3U Rear Panel, Connectorized SEL-421 Relay.
Figure 2.22 4U Rear Panel, Without Optional I/O, SEL-421 Relay.
Figure 2.23 4U Rear Panel, INT5 I/O Interface Board, SEL-421 Relay.
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