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615 Series Protection Relay Firmware Update 4.1.7 Release Notes

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This document is a release note detailing firmware update 4.1.7 for ABB’s 615 series protection relays (REF615, REM615, RET615, REU615, RED615). It lists usability improvements across communication, protection, control, HMI, and supervision functions, including enhancements from previous releases 4.1.3 through 4.1.6.

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