Description
- Product Model: 750079/801 (1VCF750079R801), REV 2.0
- Brand: ABB
- Warranty: One Year
- Input Voltage: 12 VDC internal back‑plane power, powered by REF542 feeder protection relay base unit
- Operating Temperature: ‑10 °C ~ +55 °C
- Storage Temperature: ‑40 °C ~ +85 °C
- Response Time: Modbus RTU message response ≤10 ms; data refresh synchronized with protection relay cycle
- Protection Class: Plug‑in internal PCB board, installed inside REF542 relay housing, non‑DIN‑rail
- Accuracy Class: N/A (Modbus RTU communication interface board)
- Output Frequency: N/A
- Rated Current Range: Board consumption max 120 mA @12VDC; RS‑485 field side isolated
- Communication Interface: Isolated RS‑485 Modbus RTU port; internal connector for REF542 main‑board mating
- Supported Protocols: Modbus RTU, supports reading protection events, measurement values, relay status, setting parameters
- Overload Capacity: Galvanic isolation between relay core and field bus; ESD and surge protection on RS‑485 terminals; watchdog for communication firmware
- Dimensions: 160 mm × 100 mm, plug‑in daughter‑board form‑factor for REF542 unit
Product Overview
The ABB 750079/801 (1VCF750079R801) REV 2.0 is a dedicated Modbus RTU plug‑in communication daughter‑board for ABB REF542 / REF542plus feeder protection terminals. It provides isolated RS‑485 Modbus interface, converts internal protection‑relay data into Modbus register data, realizing two‑way data exchange between the feeder relay and upper SCADA / DCS system. It uploads electrical measurement data, fault event records, protection status, and also accepts remote setting commands from host system. It solves typical pain‑points: original REF542 unit without Modbus function, lack of remote monitoring capability for medium‑voltage feeder protection devices. Power‑system protection engineers, substation automation technicians and integrators benefit from direct plug‑and‑play installation, electrical isolation for bus anti‑interference, spare‑part replacement for existing REF542 protection devices. REV 2.0 is an early hardware revision, later upgraded to REV2.5 version.
Application Scenarios
- Medium‑voltage substation feeder‑protection monitoring: Inserted inside REF542 feeder protection relay. Upload current, voltage, power, fault trip records to substation SCADA via Modbus RTU, realize remote monitoring and event recording for distribution‑network feeders.
- Industrial plant power‑distribution cabinet protection system: Used for motor and incoming‑line REF542 protection devices inside factory MV cabinets. Modbus interface connects plant DCS to read protection alarm and measurement data.
- Legacy REF542 unit retrofit & spare replacement: Plug‑in spare for existing REF542 protection terminals. No cabinet rework required, directly upgrade communication capability for old protection relays. Note: REV 2.0 hardware version has firmware differences compared with REV2.5, cannot be mixed arbitrarily without compatibility verification.
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