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REX640 PCL4 Protection Relay Firmware Release Notes 1.3.5

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This document is a release note detailing firmware version 1.3.5 for ABB REX640 PCL4 protection relays and HMIs, including scope verification criteria and implemented improvements. It covers enhancements in control, HMI, monitoring, protection, and supervision functions, such as high-speed bus transfer corrections, WHMI session handling, and frequency protection extensions.

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