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Explanation of LOP logic in SEL-751A. The LOP logic in the instruction manual data code 20111028 & data code 20090501 are working on the same principle.SEL-751A. Feeder Protection Relay. Instruction Manual. *PM751A-01-NB* SEL products appearing in this document may be covered by U.S. and Foreign patents Featured. Instruction Manual. Data Sheet you can also view metered quantities and perform. sel- 751a feeder protection relay instruction manual * pm751a- 01- nb* provided by northeast power systems In addition, the SEL-751A is ATEX- and Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive View and Download Sel 751A instruction manual online. Feeder Protection Relay. 751A pdf manual download. For more information on the setting procedures, please refer to the SEL-751A instruction manual, or contact your local SEL representative. The SEL-751A Feeder Protection Relay provides an excep- In addition, the SEL-751A supports single voltage input. the instruction manual. Appendix C: SEL Communications Processors R.Instruction Manual Table 1.1 AG2011-01: Using the SEL-751 and SEL-751A for Arc-Flash Detection,. SEL-751A Data Sheet Schweitzer Engineering Laboratories, Inc. A diagram for a four-wire wye connection is also available in the instruction manual.