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SEL-551 Overcurrent / Reclosing Relay. Schweitzer Engineering Laboratories SEL-351 Protection System. Those unit are very clean with barely no sign of use, dust or scratch and are near new condition.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.