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Printed Instruction Manual PM487B-04 Customer Service Representative for assistance. Drawing Formats. Drawing Type PDF DWG. Dimension PDF (101.39 kB) DWG ( The SEL-487B Bus Differential and Breaker Failure Relay protects bus systems with up to 21 terminals (21 CTs per relay, 63 CTs with a three-relay scheme),The SEL-487B provides optimized, low-impedance bus differential fault detection by using high-speed, subcycle protection coupled with high-security 487B MANUAL >> DOWNLOAD 7 Oct 2015 SEL-487B provides optimized bus differential fault detection by using The Setup menu has Instruction Manual. Sel787 transformer protection relay instruction manual. Schwietzer sel 487b 4c,y01,y02,i01,y03,y04,i02,y05. Sel487b2 bus differential and breaker failure Instruction Manual. *PM487E-02-NB*. SEL-487E-3, -4 Relay. Current Differential and. Voltage Protection. Instruction Manual. 20171021 Flyers · Data Sheets · Guideform Specifications · Installation Guides · Instruction Manuals · Configurable Labels · Ordering Information · Related Downloads. SEL-487B Bus Differential Relay Busbar and Breaker Failure Protection, Automation, and Control System Major Features and Benefits The SEL-487B Relay nondedicated CTs with the SEL-487B Bus. Differential and Breaker Failure Relay. Eliminate complex wiring by using CT ratios that differ by up to a factor of because it is simpler and can be done manually. This application guide demonstrates steady-state, single-phase testing of the SEL-487B Bus Dif-