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Detailed operating instructions including installation, testing, and settings. SEL-487E-3, -4 Transformer Protection Relay and SEL-400 Series Relays. SEL-487E-3, -4 Relay. Instruction Manual. *PM487E-02-NB*. SEL-487E-3, -4 Relay. Current Differential and. Voltage Protection. Instruction Manual. 20171021 4 4 SEL-487E Relay Functions SEL-487E three-phase differential protection sensing: 15 The SEL-487E Instruction Manual shows all supported topologies. 8 (O,U) Over-/Underfrequency 85 RIO SEL Mirrored Bits Communications 87 (U,R,Q) These instructions must be followed for safe and reliable operation. The SEL-487E Transformer Differential Relay provides three-phase differential protection for transformer applications with up to five three-phase restraint 20090519. SEL-487B Relay. Protection. Automation. Control. Instruction Manual. *PM487B-01-NB*. Courtesy of NationalSwitchgear.comSEL-487E-3, -4 Relay Current Differential and Voltage Protection Instruction Manual 20150626 *PM487E-02-NB* © 2011–2015 by Schweitzer Engineering