Schweitzer Engineering Laboratories 0551003X631X Overcurrent Reclosing Relay

Schweitzer Engineering Laboratories' SEL-551 Overcurrent/Reclosing Relay (part number 0551003X631X) delivers complete overcurrent protection and multi-shot reclosing for distribution feeders in a compact relay package. It uses phase, negative-sequence, and ground overcurrent elements and supports configurable reclosing logic to clear faults and automatically restore service while coordinating with adjacent devices. The device is designed for line protection in feeder and substation configurations and is described in SEL's official literature, including datasheets and manuals, which detail its protection elements, reclosing capabilities, and setup options. Panel-mount installations are supported, with references to horizontal panel mounting in variant product listings.