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Complete Feeder Protection—Install two SEL-501/501-2 Dual Universal Overcurrent/Dual Overcurrent Relays in two-high breaker switchgear to protect two separate Front-panel control eliminates the need for manual control switches. Includes negative-sequence overcurrent protection for sensitive, fast phase-phase fault ? Front panel controls eliminate the need for manual control switches. ? Includes negative sequence overcurrent protection for sensitive, fast phase to phase View and Download Schweitzer Engineering Laboratories SEL-501-2 instruction manual online. DUAL OVERCURRENT RELAY. SEL-501-2 relays pdf manual download. Featured. Instruction Manual. SEL-501-2 Dual Overcurrent Relay Schweitzer engineering laboratories SEL-501-2 Pdf User Manuals. View online or download Schweitzer engineering laboratories SEL-501-2 Instruction Manual. SEL-501 Dual Universal Overcurrent Relay. Manual ID: DS-19991129. Subcategory: Relays. Manufacturer: Schweitzer Engineering Laboratories. Date: 11/30/1998.Introduction. Date Code 20010518. SELa501/501a1 Instruction Manual. SEL 501 DUAL RELAY APPLICATIONS. Protect. Two. Feeders. Two Relays.