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615 Series Protection Relay Firmware Update 5.1.21 Release Notes

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This document is a release note detailing firmware update 5.1.21 for ABB's 615 series protection relays (REF615, REM615, RET615, REU615, RED615, REV615, REG615). It describes implemented usability improvements, protection enhancements, engineering changes, and previous update 5.1.20's cyber security fixes, including CVE-2021-22283.

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