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620 Series Protection Relay Firmware Update 2.1.17 Release Note

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This release note details firmware update 2.1.17 for ABB 620 series protection relays (REF620, REM620, RET620), including usability, communication, cyber security, measurement, protection, and supervision improvements. Key enhancements include improved PTP time synchronization, MMS protocol stack updates, enhanced earth-fault protection, and LHMI self-recovery fixes.

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