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615 Series Protection Relays Firmware Update 4.1.8 Release Notes

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This document is a release note detailing firmware update 4.1.8 for ABB's 615 series protection relays (REF615, REM615, RET615, REU615, RED615). It describes implemented cyber security fixes for Ripple20 vulnerabilities, supervision improvements for time counter rollover and self-supervision, and communication enhancements for GOOSE receiving and protection communication restoration.

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