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615 Series Protection Relays Firmware Update 4.0.8 Release Notes

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This document details firmware update release 4.0.8 for ABB's 615 series protection relays (REF615, REM615, RET615, REU615, RED615), including usability improvements and a self-supervision watchdog enhancement. It also documents improvements from the previous release 4.0.7, which addressed Ripple20 cyber security vulnerabilities, supervision, protection, and communication stack issues.

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