ii Installation Date Code 20011026
SEL-321/321-1 Instruction Manual
FIGURES
Figure 6.1: 9-Pin Connector Pin Number Convention............................................................................6-6
Figure 6.2: SEL-321 Relay Horizontal Front and Rear Panel Drawings (One I/O Board
Conventional Terminal Block Version; 8 fast high-current interrupting isolated
outputs shown – other options are available)...............................................................6-13
Figure 6.3: SEL-321 Relay Horizontal Front and Rear Panel Drawings (One I/O Board
Conventional Terminal Block Version; 12 isolated outputs shown – other
options are available) ...................................................................................................6-14
Figure 6.4: SEL-321 Relay Horizontal Front and Rear Panel Drawings (Two I/O Board
Conventional Terminal Block Version; 8 fast high-current interrupting isolated
outputs per board shown – other options are available) ..............................................6-15
Figure 6.5: SEL-321 Relay Horizontal Front and Rear Panel Drawings (One I/O Board
Conventional Terminal Block Version; 16 outputs with shared return terminals
shown – other options are available)............................................................................6-16
Figure 6.6: SEL-321 Relay Vertical Front and Rear Panel Drawings (One I/O Board
Conventional Terminal Block Version; 16 outputs with shared return terminals
shown – other options are available)............................................................................6-17
Figure 6.7: SEL-321 Relay Horizontal Front and Rear Panel Drawings (Two I/O Board
Conventional Terminal Block Version; 12 isolated outputs per board shown –
other options are available)..........................................................................................6-18
Figure 6.8: SEL-321 Relay Horizontal Front and Rear Panel Drawings (Two I/O Board
Conventional Terminal Block Version; 16 outputs with shared return terminals
per board shown – other options are available) ...........................................................6-19
Figure 6.9: SEL-321 Relay Vertical Front and Rear Panel Drawings (Two I/O Board
Conventional Terminal Block Version; 16 outputs with shared return terminals
per board shown – other options are available) ...........................................................6-20
Figure 6.10: SEL-321 Relay Horizontal Front and Rear Panel Drawings (One I/O Board Plug-In
Connector Version; 12 isolated high-current interrupting outputs shown – other
options are available) ...................................................................................................6-21
Figure 6.11: SEL-321 Relay Horizontal Front and Rear Panel Drawings (One I/O Board Plug-In
Connector Version; 16 outputs with shared return terminals shown – other
options are available) ...................................................................................................6-22
Figure 6.12: SEL-321 Relay Horizontal Front and Rear Panel Drawings (Two I/O Board Plug-In
Connector Version; 12 isolated high-current interrupting outputs per board
shown – other options are available)............................................................................6-23
Figure 6.13: Relay Dimensions and Drill Plan (One and Two I/O Board Versions – Conventional
Terminal Blocks).......................................................................................................... 6-24
Figure 6.14: Relay Dimensions and Drill Plan (One and Two I/O Board Versions – Plug-In
Connectors Option) ......................................................................................................6-25
Figure 6.15: Communications and Clock Connections – One Unit at One Location .............................6-26
Figure 6.16: Communications and Clock Connections – Multiple Units at One Location ....................6-26
Figure 6.17: SEL-321 Relay External AC Current and Voltage Connections........................................6-27
Figure 6.18: SEL-321 Relay Typical External DC Connection Diagram (One I/O Board Version;
16 outputs with shared return terminals shown – other output options are
available)......................................................................................................................6-27
Figure 6.19: SEL-321 Relay External DC Connections to Communications Equipment (One I/O
Board Version; 16 outputs with shared return terminals shown – other options
are available) ................................................................................................................6-28
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