JUAL/SELL: SEL-551 OVERCURRENT RECLOSING RELAY. SEL-551 Overcurrent/Reclosing Relay replaces the many relays, control switches, and wiring required in traditional distribution substation protection and control panels. The relay also replaces line recloser control packages at a fraction of the cost. SEL-551 Monitor and protect distribution feeders, distribution buses, transformers, capacitors, or circuit breakers. SEL-551 Connect the separate neutral-current input to accommodate core-balance CTs, separate neutral CTs, tertiary-winding CTs, or CT ground-residual circuits. SEL-551 Reclosing Control, Coordinate with downstream reclosers using sequence coordination logic to program up to four reclosing attempts. Field-Proven Ruggedness, Program SELogic control equation inputs and outputs to meet application needs in multiple environments. A wide operating temperature range (–40° to +85°C) allows installation in a control house or outdoor enclosure.
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