ABB REM543CG212AAAA Numerical Motor Management Relay / Protection Relay
Parameter Name
Parameter Value
Product Model
ABB REM543CG212AAAA
Manufacturer
ABB
Product Family/Series
Relion®, REM 543 Series
Product Type
Numerical Motor Management Relay / Protection Relay
Rated Supply Voltage
24 — 250 V DC / 48 — 250 V AC (specific range depends on suffix code)
Motor Voltage
Up to 690V AC (for measurement and protection)
Current Input
2 x 3-Phase CT Inputs (for protection & measurement); 1 x 3-Phase VT Input (optional, for voltage-related functions)
Protection Functions
Thermal Overload (Inverse/Definite Time), Stall, Excessive Start Time, Current Unbalance/Loss of Phase, Earth Fault, Short Circuit, Underpower, Under/Overvoltage, Under/Overfrequency, PTC/KTY Temperature Input, Bearing Temperature
The ABB REM543CG212AAAA is a highly advanced and versatile numerical motor protection relay, a core component of ABB’s renowned Relion® product family, specifically within the REM 543 series dedicated to comprehensive motor management. This device transcends the function of a simple overload relay, acting as a fully integrated, multifunctional protection, control, and monitoring unit for medium-voltage or large, critical low-voltage induction and synchronous motors. Engineered to safeguard valuable motor assets against a wide spectrum of electrical and operational faults, the ABB REM543CG212AAAA continuously analyzes motor current, voltage, temperature, and other critical parameters. It executes complex protection algorithms to detect conditions such as thermal overload, stator and bearing overtemperature, phase unbalance, stall, short circuit, earth fault, and undercurrent, initiating precise tripping or alarming actions to prevent catastrophic damage and costly unplanned downtime.
The value proposition of the ABB REM543CG212AAAA lies in its exceptional configurability, advanced diagnostics, and seamless integration capabilities. It serves as the intelligent «brain» for the motor, not only providing protection but also enabling sophisticated control sequences like direct-on-line, star-delta, or soft-starter control. Equipped with a clear graphical display and intuitive navigation, it offers local access to real-time measurements, event logs with timestamps, and detailed disturbance records. As a communication-ready device, the ABB REM543CG212AAAA can be seamlessly integrated into modern industrial networks via protocols like IEC 61850, Modbus RTU, or Profibus DP, providing plant-wide visibility into motor health and performance. This facilitates predictive maintenance strategies, operational optimization, and centralized control, making it an indispensable tool for maximizing motor lifecycle and overall system reliability in demanding industrial environments.
Technical Specifications
Parameter Name
Parameter Value
Product Model
ABB REM543CG212AAAA
Manufacturer
ABB
Product Family/Series
Relion®, REM 543 Series
Product Type
Numerical Motor Management Relay / Protection Relay
Rated Supply Voltage
24 — 250 V DC / 48 — 250 V AC (specific range depends on suffix code)
Motor Voltage
Up to 690V AC (for measurement and protection)
Current Input
2 x 3-Phase CT Inputs (for protection & measurement); 1 x 3-Phase VT Input (optional, for voltage-related functions)
Protection Functions
Thermal Overload (Inverse/Definite Time), Stall, Excessive Start Time, Current Unbalance/Loss of Phase, Earth Fault, Short Circuit, Underpower, Under/Overvoltage, Under/Overfrequency, PTC/KTY Temperature Input, Bearing Temperature
Current, voltage, power, power factor, energy, motor thermal capacity, run time, starts counter
Communication Ports
1x RS485 (Modbus RTU), 1x Ethernet (IEC 61850, Modbus TCP)*, 1x USB (for local configuration) (configuration may vary by suffix)
Display
Large graphical LCD with backlight
Enclosure Protection
IP54 (typical, for cabinet mounting)
Standards Compliance
IEC 60255, IEC 60947-4-1, UL 508, etc.
Key Features and Advantages
The core strength of the ABB REM543CG212AAAA lies in its fusion of comprehensive motor protection, advanced monitoring, and flexible integration capabilities. Its most prominent feature is its exhaustive suite of protection functions. It goes beyond basic overload protection with a precise thermal model that accounts for heating and cooling, providing accurate protection even during frequent starts. It integrates specialized protections for all operational phases, including stall, prolonged starting, current unbalance, and various earth fault protections. Crucially, it supports direct connection of PTC or KTY temperature sensors, enabling direct measurement and protection of stator and bearing temperatures, offering far more precise overheating protection than traditional current-based estimation methods.
REM545AG228AAAA
Advanced control and diagnostic capabilities are another major highlight. This device is more than a protection relay; it is a motor controller. Through its programmable logic and multiple digital outputs, it can directly execute complex starting sequences like Direct-On-Line, Star-Delta, and soft-starter bypass control. Its built-in high-performance disturbance recorder captures waveforms of key electrical quantities before and after a fault, providing invaluable data for root-cause analysis of trips. The clear, large graphical display allows for local viewing of real-time data, alarm lists, sequence of events records, and motor statistics (like running hours, start counts), significantly simplifying troubleshooting and predictive maintenance for operational staff.
Powerful communication and integration flexibility are key to its success in modern automation systems. The ABB REM543CG212AAAA natively supports major industrial communication protocols including IEC 61850 and Modbus TCP/RTU, allowing it to integrate effortlessly into plant DCS, SCADA, or PLC systems. This enables remote monitoring of all motor status information, measurements, and alarms, facilitating centralized management and predictive maintenance strategies. Its robust industrial design and wide power supply voltage range ensure long-term reliable operation in the harshest industrial environments.
Application Areas
The ABB REM543CG212AAAA is the ideal solution for protecting and controlling medium-voltage or large low-voltage motors used in critical process applications. In the oil, gas, and petrochemical industries, it is widely used to drive compressors, pumps (e.g., pipeline pumps, injection pumps, circulation pumps), and fans. These applications demand extreme reliability and rapid response to complex faults, where the comprehensive protection and direct temperature monitoring of the REM543CG212AAAA are crucial.
In mining and cement industries, this relay protects motors for ball mills, crushers, conveyor drives, and large fans. These motors often face heavy-duty starts and shock loads; the stall protection, start monitoring, and advanced thermal overload model of the REM543CG212AAAA effectively prevent damage from mechanical jamming or sustained overloads. In water and wastewater treatment plants, it safeguards critical pumps and aeration blowers, with its communication features facilitating the integration of these dispersed assets into a central monitoring system for efficient asset management. Furthermore, in power plants (for boiler feed pumps, ID/FD fans), paper mills, and shipboard auxiliary propulsion systems, the ABB REM543CG212AAAA ensures the reliable and intelligent operation of high-value motor-driven assets.
Related Products
ABB REM543 CG2 1A (other suffix variations): Variants with different power supply voltages, communication protocol options (e.g., Profibus DP), or output contact configurations.
ABB REM542: A similar motor protection relay from the same family, often with a slightly different feature set or form factor, suitable for different motor sizes or application complexities.
ABB RET615 / REF615: Feeder and bay controller relays from the Relion® 615 series, used for protecting and controlling electrical feeders and transformers, often installed in the same switchgear as the REM543.
ABB CM-MPS: Motor Protection System software for easier configuration, setting, and disturbance record analysis for REM 54x relays.
ABB CTs & VTs (Current & Voltage Transformers): The external sensing devices required to provide scaled current and voltage signals to the REM543CG212AAAA.
ABB PCM600: The universal configuration and monitoring tool for the entire Relion® product family, used for detailed configuration, disturbance analysis, and asset management of the REM543.
ABB Softstarter (e.g., PSR, PSS): A soft-start unit that can be controlled and monitored by the REM543CG212AAAA for a complete motor starting and protection solution.
ABB ACS880 Drive: A variable frequency drive that can be integrated with the REM543 for enhanced motor protection and system coordination.
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