Schweitzer Engineering Laboratories SEL-251 - Page 136

ii Table of Contents Date Code 20000421
SEL-251, -2, -3 Instruction Manual
FIGURES
Figure 6.1: Nine-Pin Connector Pin Number Convention ....................................................................... 6-4
Figure 6.2: SEL-251 Conventional Terminal Block Model Relay Horizontal Front and Rear
Panel Drawings............................................................................................................ 6-13
Figure 6.3: SEL-251 SLP Relay Dimensions and Drill Plan ................................................................. 6-14
Figure 6.4: SEL-251 Plug-In Connector Model Relay Horizontal Front and Rear Panel Drawings..... 6-15
Figure 6.5: SEL-251 LP Relay Dimensions and Drill Plan (for relays with 1-amp nominal
current inputs).............................................................................................................. 6-16
Figure 6.6: Panel Cutout Diagram for Panel-Mount Relays .................................................................. 6-17
Figure 6.7: SEL-251 Conventional Terminal Block Model DC External Connection Diagram
(Typical) ...................................................................................................................... 6-17
Figure 6.8: SEL-251 Polarity Sensitive Plug-In Connector Model DC External Connection
Diagram (Typical) ....................................................................................................... 6-18
Figure 6.9: Communications and Clock Connections - One Unit at One Location............................... 6-18
Figure 6.10: Remote Communications, Local Display, and Clock Connections - Multiple Relay
Units at One Location.................................................................................................. 6-19
Figure 6.11: SEL Relay Communications Diagram for Connection to the SEL-DTA.......................... 6-19
Figure 6.12: SEL-251 Relay Typical AC External Current and Voltage Connections.......................... 6-20