ABB REM543CG212AAAA numerical machine protection relay (Relion REM543 series). For medium-voltage motors/generators, overcurrent/earth fault/thermal protection, 15 BI/12 BO, IEC 61850, marine certified.

Product Overview

REM543CG212AAAA is a high-performance numerical machine protection relay (intelligent electronic device, IED) from ABB’s Relion® REM 543 series. It is a dedicated protection, control, monitoring and measurement terminal designed for medium-voltage motors, generators, and generator-transformer units in industrial power systems. This legacy but widely applied model offers comprehensive protection functions and robust communication for power distribution, power plants, marine and offshore applications.

Key Specifications

• Brand: ABB
• Full Model: REM543CG212AAAA
• Series: Relion® REM 543 (Machine Protection Terminal)
• Type: Numerical Motor/Generator Protection Relay
• Status: Legacy product (discontinued since 2022, still widely serviced)
• Protection Application:
• Medium-voltage synchronous/asynchronous motors (pumps, mills, crushers)
• Small/medium power generators (diesel, hydro, steam)
• Generator-transformer (GSU) units
• Configuration Code (CG212AAAA):
• C: Fixed front panel HMI display
• G: Standard sensor configuration
• 212: I/O & hardware variant
• AAAA: Standard supply & options
• I/O Configuration:
• Binary Inputs (BI): 15 optical isolated
• Relay Outputs (BO): 12 changeover contacts
• Optional RTD/analog input module
• 4×0–20 mA analog outputs (optional)
• Power Supply: 80–265 V AC/DC (wide range)
• Communication:
• RS-232 (front panel)
• IEC 61850 (via SPA-ZC 400 adapter)
• SPA bus / Modbus support
• Certifications: CE, Marine & Offshore approved
• Operating Temp: -10°C to +55°C
• Dimensions: Standard 19" rack / half enclosure
• Condition: New Original / Refurbished / Used

• Warranty: 12 Months

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Core Protection Functions

• Overcurrent protection (50/51): Instantaneous & time-delayed

• Earth fault protection (50N/51N): Residual current

• Thermal overload protection (49): Motor stator thermal model

• Start-up supervision: Stall protection, start counter

• Unbalanced current / negative sequence (46)

• Over/Under voltage (59/27)

• Over/Under frequency (81H/81L)

• Phase reversal / phase loss

• RTD temperature monitoring (optional)

• Programmable logic (PLC) functions

Key Features

• Comprehensive machine protection: Full set of motor/generator-specific functions.

• High accuracy measurement: Current, voltage, power, energy, frequency.

• Flexible I/O: 15 BI / 12 BO for control & interlocking.

• Industrial communication: IEC 61850 compatibility for smart grids.

• Marine rated: Robust design for offshore and marine environments.

• Event & disturbance recording: Fault analysis & diagnostics.

• Front panel HMI: LED indicators, local operation & settings.

Typical Applications

• Medium-voltage motor control (pumps, fans, compressors, mills)

• Generator protection (small hydro, diesel gensets, CCGT)

• Power plant auxiliary systems

• Marine & offshore (shipboard, oil & gas platforms)

• Industrial power distribution (steel, cement, paper, mining)

• Water & wastewater treatment plants

• Utility substations & distribution networks

  
  

About us

Guizhou Yuanmiao Automation Equipment Co., Ltd. is a professional supplier engaged in industrial automation spare parts and international trade. We mainly supply genuine DCS systems, PLC modules, synchronous relays, servo drives, robot spare parts and other widely used control components.

We focus on world-famous brands such as ABB, Siemens, Woodward, Bently, GE and others. With reliable overseas sourcing, fast delivery and quality guarantee, we provide global customers with cost-effective products and professional foreign trade services.

Our products are widely used in power plants, substations, oil and gas, metallurgy, data centers, marine and manufacturing industries. We are committed to becoming a trustworthy one-stop partner for industrial automation spare parts.