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View and Download Sel 551 instruction manual online. Overcurrent Relay Reclosing Relay. 551 relays pdf manual download. SEL-551 Relay Overcurrent Relay Reclosing Relay Instruction Manual *PM NB* ! CAUTION The relay contains devices sensitive to Electrostatic Discharge (ESD). The SEL-551C Overcurrent/Reclosing Relay combines overcurrent protection, built-in I/O, enhanced communications features, and multiple-shot reclosing in one The information in this manual is provided for informational use only and is The SEL-551C Relay differs from the SEL-551 Relay in the following major. Find out all of the information about the Schweitzer Engineering Laboratories product: over-current protection relay SEL-551C. Contact a supplier or theThe SEL-551/SEL-551C provides demand and peak demand current thresholds. When demand current exceeds a threshold, the respective Relay Word bit. PDEM, NDEM,