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615 Series Protection Relays Firmware Release 5.1.22

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This document is a release note detailing firmware update 5.1.22 for ABB's 615 series IEC protection relays (including REF615, REM615, RET615, and others). It outlines implemented improvements in cyber security (TLS 1.2 support, webserver updates), supervision (load profile recorder stability, watchdog enhancements), and lists changes from previous releases 5.1.21 and 5.1.20.

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