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Key Technical Specifications
- Product Model: REM545AG228AAAA
- Manufacturer: ABB
- Product Family: Relion® 545 series
- Primary Function: Motor protection, control, and condition monitoring
- Current Inputs: 3-phase phase currents (1A/5A), residual (earth fault) current input
- Voltage Inputs: 3-phase line-to-line or line-to-neutral (for under/overvoltage, phase reversal, etc.)
- Communication Interfaces: 2× 10/100 Mbps Ethernet (IEC 61850, Modbus TCP), 1× RS-485 (Modbus RTU)
- Supported Protocols: IEC 61850 Ed. 2 (GOOSE, MMS), Modbus TCP/RTU, DNP3 (optional)
- Protection Functions: Thermal overload (with RTD backup), stall, phase imbalance, under/overvoltage, earth fault, bearing failure prediction (via harmonics)
- Control Features: Direct motor start/stop commands, breaker interlocking, programmable logic (PLC-like)
- Diagnostics: Built-in web server for local access, event logging, disturbance recording (oscillography), health index
- Power Supply: Universal 24–250 V AC/DC
- Standards Compliance: IEC 60255, IEC 61850-3, IEEE C37.90
Core Performance and Selection Advantages
The REM545AG228AAAA represents a significant evolution from legacy electromechanical and basic digital relays by integrating advanced protection, control, and digital connectivity into a single compact unit. Its dual Ethernet ports with native IEC 61850 Edition 2 support eliminate the need for external protocol converters or serial-to-Ethernet gateways, simplifying network architecture and reducing hardware count. The processing engine delivers fast operation—thermal overload curves execute in real time with high-resolution sampling (up to 48 samples/cycle)—ensuring accurate motor modeling even under variable load conditions.
A key functional highlight is the embedded web server, which allows maintenance personnel to access real-time measurements, event logs, and oscillographic records directly via a standard browser without requiring engineering software. This accelerates troubleshooting during outages. Additionally, the relay supports predictive features such as bearing wear detection through harmonic analysis and thermal capacity tracking, enabling condition-based maintenance rather than fixed schedules.
From a total cost of ownership (TCO) perspective, the REM5445 reduces engineering time through ABB’s PCM600 or System 800xA configuration tools, which auto-generate IEC 61850 SCL files. Fewer discrete components (no separate meter, no communication gateway) lower panel space, wiring labor, and long-term spare parts inventory. For projects targeting digital transformation or compliance with modern grid codes, this relay provides a future-proof foundation without premium cost.
REM545AG228AAAA ABB
System Integration and Expandability
The REM545AG228AAAA is engineered for seamless integration into modern automation ecosystems. It is fully supported in ABB’s PCM600 engineering suite and System 800xA DCS platform, enabling unified configuration, testing, and asset management. The use of standardized IEC 61850 data models ensures interoperability with third-party SCADA, MES, and asset performance management (APM) systems. Native OPC UA support (via gateway or future firmware) further facilitates secure data exchange with cloud analytics platforms using MQTT or REST APIs.
In terms of networking, the dual Ethernet ports allow daisy-chaining or ring topologies (with PRP/HSR when paired with compatible switches), supporting both process bus (GOOSE for tripping) and station bus (MMS for monitoring) on separate interfaces. This aligns with substation automation best practices for security and reliability.
The relay’s expandability lies not in physical I/O modules—which are fixed—but in its software-configurable logic and communication capabilities. Up to 64 virtual inputs/outputs can be mapped via IEC 61850 GOOSE, effectively extending control functionality across the network. While it does not support hot-swap or field expansion like a PLC, its rich onboard features (16 programmable LEDs, 8 binary inputs, 6 output relays) cover most motor control requirements. For larger MCCs, multiple REM545 units can be centrally managed through a single engineering project, ensuring consistency and reducing commissioning time.
