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SEL-421 Relay Protection and Automation System Instruction Manual Reference Manual 20111215 *PM421-03-NB* © 2001–2011 by Schweitzer Engineering Laboratories This manual provides information and instructions for installing and operating the SEL-421 Relay. The three volumes that comprise this manual are for use. Detailed operating instructions including installation, testing, and settings. Legacy SEL-421-0, -1, -2, -3 Relay Reference Manual. Summary of Contents for Sel SEL-421. Page 1 SEL-421 Relay Protection and Automation System Instruction Manual Reference Manual 20111215 *PM421-03-NB*. SEL-421 Relay Protection and Automation System Instruction Manual Reference Manual *PM NB* by Schweitzer Engineering Laboratories, Inc. All rights reserved.A graphical user interface system provides logic and application Apply the SEL-421-7 TiDL relay with the SEL-TMU TiDL Merging Unit in the field to Pullman, WA USA 99163-5603. Tel: (509) 332-1890 FAX: (509) 332-7990. SEL-421 Relay. SEL-421-1 Relay. Protection. Automation. Control. User's Guide SEL-421 Relay. Protection and. Automation System. Instruction Manual. Reference Manual. *PM421-03-NB*. Artisan Technology Group - Quality Instrumentation .