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REX610 Protection Relay Firmware Update 1.2.1

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This document details the firmware update release 1.2.1 for the REX610 protection relay, including scope, order code verification, and implemented usability improvements. It covers enhancements to communication protocols (IEC 61850, Modbus), SNTP/NTP support, ARC module updates, and LHMI functionality, along with a reference to previous release 1.2.0 features.

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