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REJ601/REF601/REM601 Communication Card Installation Application Note

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This application note describes the step-by-step installation of an add-on communication card in REJ601/REF601 feeder protection relays and REM601 motor protection relays. The communication module supports RS485 on MODBUS RTU or IEC 60870-5-103 protocol and can be installed on-site in existing relays from specified firmware versions onward.

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