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615 Series Protection Relays Firmware Update Release Notes

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This document details firmware update releases 5.1.23 and 5.1.22 for ABB's 615 series IEC protection relays, including models such as REF615, REM615, and RET615. It outlines implemented usability improvements, supervision enhancements, protection function corrections, and communication updates, along with cyber security fixes for the earlier release.

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