ABB REM543CG212AAAA Multifunction Motor & Power Protection Relay
Product Overview
The ABB REM543CG212AAAA is a microprocessor-based multifunction protection relay from ABB’s REM 543 series, engineered to deliver comprehensive protection, control, measurement, and monitoring functions for motors and power systems in industrial applications. It is widely utilized for safeguarding medium-voltage motors, generators, and critical power distribution equipment, offering reliable fault detection and rapid response capabilities.
Key Protection & Monitoring Functions
This relay is designed to protect electrical machines and circuits against a range of abnormal conditions, including:
Overcurrent protection (ANSI 50/51)
Earth-fault and ground fault protection
Phase loss and imbalance detection
Motor thermal overload and stall protection
Voltage abnormalities (over/undervoltage)
Frequency deviation monitoring
These multifunction capabilities help prevent equipment damage and reduce unscheduled downtime.
| Parameter |
Description |
| Manufacturer |
ABB |
| Model |
REM543CG212AAAA |
| Series |
REM 543 Protection Relays |
| Auxiliary Voltage |
24–250 V AC/DC (varies by configuration) |
| Current Inputs |
Configurable for 1 A or 5 A CT inputs |
| Frequency Range |
45–65 Hz |
| I/O Options |
Binary inputs and relay outputs (varies) |
| Communication |
Ethernet (IEC 61850), RS-485 (Modbus), other industrial protocols |
| Display |
LCD with status indicators |
| Mounting Type |
Panel or rack installation |
| Operating Temperature |
–25 °C to +70 °C |
| Protection Class |
Typically IP40 (front) |
| Certifications |
IEC 60255, UL 508, CE, RoHS compliant |
Technical Parameters
Below are typical characteristics associated with this protection relay:
Communication & Integration
The REM543CG212AAAA supports modern industrial communication standards to integrate with automation and protection systems:
IEC 61850 for substation automation and GOOSE messaging
Modbus RTU & TCP/IP for SCADA and PLC connectivity
Optional protocol support such as DNP3.0
This enables seamless integration into digital control systems and comprehensive remote monitoring.
User Interface & Diagnostics
Operators interact with the relay via:
Backlit LCD display showing real-time measurements and status information
Menu-driven interface for configuration and event review
LED status indicators for protection and communication states
Event logs and fault records to support post-incident analysis
These interface features enhance troubleshooting and system visibility.
Applications
The ABB REM543CG212AAAA is suited for a range of industrial and power applications, such as:
Motor protection in manufacturing plants
Power distribution centers and substations
Renewable energy installations (e.g., wind, solar)
Generators and backup power systems
Process industries including oil & gas, mining, and petrochemical facilities
Its versatile protection suite ensures both equipment safety and operational reliability.
Installation & Configuration
Proper deployment of the REM543CG212AAAA typically involves:
Panel or rack mounting inside switchgear or control cabinets
Correct CT/VT wiring for accurate measurement inputs
Communication setup for integration with SCADA or automation networks
Parameter configuration via front panel or ABB configuration tools
Routine checks and commissioning tests help validate protection settings and ensure system readiness.
Advantages and Value
Comprehensive protection functions covering a wide range of electrical faults
Industrial-grade reliability for long-term operation
Advanced communication support for modern automation architectures
Clear diagnostics and interface for faster troubleshooting
Modular design facilitating flexible system configurations
These benefits make the REM543CG212AAAA a reliable choice in demanding electrical protection and motor control applications.
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