ABB REM545AG228AAAA – Motor Protection and Control IED for Medium-Voltage Motors

The ABB REM545AG228AAAA is a proven motor protection and control relay from ABB’s 500-series platform, built for demanding MV motor applications where uptime, selective tripping, and clear diagnostics really matter. From my experience, it fits especially well in pump stations, compressors, crushers, kiln drives, and large fan applications—anywhere a robust thermal model and dependable start-up supervision reduce nuisance trips and protect the motor investment.
One thing I appreciate is the balanced mix of classic ABB reliability and flexible communication options, which makes it a practical drop-in for brownfield upgrades and a steady choice for new builds.

Company’s Order Placement Process and Guarantees

• – Warranty: 365 days from shipment

• – Delivery: 1 week if in stock; no more than one month at the latest

• – Payment: 50% advance payment; full payment before delivery

• – Express options: FedEx, UPS, DHL

– Order support: We verify the exact option code (AG228AAAA) against your application and switchgear drawing to avoid mismatches.

Key Features

• Comprehensive motor protection – Thermal overload model, locked-rotor/stall protection, start-up supervision, under/overcurrent, negative-sequence/unbalance, ground fault, and phase loss functions typically included.
• Flexible CT/VT inputs – Designed for standard 1 A/5 A CTs; VT inputs for voltage-dependent functions and power-based supervision in many cases.
• Event and fault recording – Disturbance recorder with time-stamped events helps maintenance teams pinpoint root causes faster.
• Programmable logic – Practical scheme logic for interlocks, permissives, and customized trip/alarm routing without external relays.
• Multiple communication options – SPA-bus, Modbus RTU, Profibus-DP, and IEC 60870-5-103 options are common on REM545; availability depends on the exact option pack AG228AAAA.
• Operator-friendly HMI – Front-panel LCD, clear status LEDs, and password-controlled access streamline testing and daily operation.
• Self-supervision – Continuous watchdog and I/O supervision improves reliability and flags internal issues before they become outages.
• Built for harsh substations – Wide auxiliary power range and sturdy mechanics suit typical MV switchgear environments.

Technical Specifications

A maintenance lead at a water utility told me they cut nuisance trips by roughly 30% after updating settings on a REM545 and enabling start-time supervision with correct CT ratios. You might notice the difference right after commissioning—fewer unexplained stops and clearer diagnostics when something actually goes wrong.

Related or Supporting Products

• ABB REM615 – Newer Relion series motor IED with native IEC 61850 and modern cybersecurity. A common replacement when upgrading from REM545 in digital substation projects.
• ABB REM543 – Closely related earlier model; fewer options in some configurations compared with REM545.
• ABB REM620 – Higher-function Relion model for complex motor schemes and advanced arc-flash or process interlocks.
• ABB RTXP test blocks – For safe secondary injection and trip-circuit testing without disturbing wiring.
• CTs/VTs matched to motor feeders – Ensure 1 A/5 A CT compatibility and correct VT ratios; accuracy class matters for trip stability.

Installation & Maintenance

• Mounting and environment – Install in a clean, dry control cabinet with adequate ventilation. Typical cut-out for ABB 500-series flush mounting; allow cable bend radius and front access.
• Wiring – Observe CT polarity and shorting practices; route VT wiring separately from power cables. Use shielded twisted pair for comms and ground the shield at one end only.
• Power supply – Verify auxiliary supply within the ordered range before energizing. A dedicated DC supply with surge protection is recommended.
• Configuration – Set the thermal model with actual motor FLA and cooling class. Start permissives and stall limits should reflect real start curves. In many cases, settings are managed via ABB’s CAP 540 engineering tool for this series.
• Commissioning tests – Perform secondary injection on key elements (49 thermal, 51/50 overcurrent, 50N/51N ground fault). Check trip circuit, lockouts, and SCADA points.
• Routine maintenance – Annually back up settings, clear dust from vents, review event logs, and verify I/O health. Firmware updates should be applied when available and tested in a maintenance window.
• Safety – De-energize control power before I/O changes. Use proper CT shorting links. Follow site LOTO and arc-flash procedures at all times.

Quality & Certifications

• Typically compliant with IEC 60255 protection relay standards
• CE marking; RoHS conformity for electronic components
• UL/cUL applicability depends on specific option build and market requirements
• Manufacturer’s standard quality controls; serial-number traceability for service
• Our supplied units include a 365-day warranty and documented test reports where available

If you need us to verify the exact hardware options and protocol set behind code AG228AAAA (for example SPA-bus versus Profibus-DP, or specific I/O counts), share the switchgear drawings and motor data. We typically confirm compatibility within a day so your protection settings can move ahead without surprises.