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The ABB REF542plus (order code 2RCA029395) is a multifunctional feeder protection and control relay designed for medium-voltage (MV) distribution networks in utility, industrial, and commercial power systems. As part of ABB’s Relion® product family, the ABB REF542plus integrates comprehensive protection, local control, metering, monitoring, and communication capabilities into a single compact device—ideal for ring main units (RMUs), switchgear panels, and secondary substations. It delivers advanced functionality such as three-phase overcurrent protection, earth-fault detection, arc flash sensing, circuit breaker failure backup, and programmable logic control—all within a rugged, front-accessible housing suitable for space-constrained installations.
Engineered for modern smart grid requirements, the ABB REF542plus (2RCA029395) supports IEC 61850 Edition 2 with GOOSE messaging, enabling seamless integration into digital substation architectures. Its built-in human-machine interface (HMI) with graphical LCD allows on-site configuration, event review, and real-time status monitoring without external tools. The ABB REF542plus not only enhances power system reliability through fast, selective fault clearance but also reduces operational costs by eliminating the need for separate meters, PLCs, or RTUs. With cybersecurity features compliant with IEC 62443 and robust electromagnetic immunity per IEC 60255, it ensures secure and dependable operation in the most demanding environments.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | REF542plus |
| Manufacturer | ABB |
| Product Type | Multifunction Feeder Protection & Control Relay |
| Order Code | 2RCA029395 |
| Voltage Input | 3-phase phase-to-phase/phase-to-earth (100/110/115 V or 230 V AC) |
| Current Input | 1 A or 5 A (configurable), 3-phase + neutral/earth |
| Protection Functions | 50/51, 50N/51N, 67, 79, 50BF, Arc Protection (optional), Thermal Overload |
| Communication Protocols | IEC 61850 Ed. 2 (GOOSE, MMS), Modbus RTU/TCP, DNP3, SPA bus |
| Digital I/O | 8 binary inputs, 4 binary outputs (relay contacts, 250 V AC/DC, 5 A) |
| Analog Outputs | 2 configurable (0–20 mA or 4–20 mA) |
| Display | Graphical LCD with keypad (backlit, 128×64 pixels) |
| Operating Temperature | –25°C to +55°C |
| Power Supply | 24–250 V DC or 100–240 V AC (dual-range, auto-detect) |
| Standards Compliance | IEC 60255, IEC 61000-4 (EMC), IEC 61850, IEEE C37.90 |
| Cybersecurity | Role-based access, password protection, audit trail, IEC 62443-ready |
Main Features and Advantages
Integrated protection and automation in one platform: The ABB REF542plus combines over 30 protection functions—including directional overcurrent, auto-reclosing, and optional fiber-optic arc flash detection—with programmable logic controller (PLC)-like automation capabilities. This eliminates the need for external logic relays or RTUs, reducing panel complexity, wiring, and lifecycle costs.
Native IEC 61850 support for future-proof digital substations: Unlike legacy relays requiring protocol converters, the ABB REF542plus (2RCA029395) implements full IEC 61850 Edition 2 with GOOSE messaging for high-speed interlocking and peer-to-peer communication. This enables substation-wide event synchronization, reduced cabling, and seamless SCADA integration—accelerating deployment of smart grid initiatives.
User-friendly commissioning and maintenance: The ABB REF542plus features an intuitive graphical HMI with context-sensitive menus, real-time phasor diagrams, and waveform capture (up to 4 cycles pre- and post-fault). Engineers can perform on-device testing, view event logs with millisecond timestamps, and export disturbance records via USB—dramatically shortening troubleshooting time.
Compact design for space-limited applications: With a depth of only 160 mm and front-wiring capability, the ABB REF542plus fits easily into retrofit RMUs or compact switchgear where panel space is at a premium. Its modular I/O expansion options allow customization without changing the base unit—ensuring scalability from basic feeders to complex motor control centers.
Enhanced safety with arc flash mitigation: When equipped with the optional arc protection module, the ABB REF542plus detects dangerous arc flashes within 1–2 ms using light sensors and current verification, triggering ultra-fast tripping to protect personnel and equipment—complying with NFPA 70E and IEEE 1584 safety standards.
Application Field
The ABB REF542plus is widely deployed across utility distribution networks, industrial plants, and infrastructure facilities requiring reliable, intelligent feeder management. In urban secondary substations and underground ring main systems, it provides selective overcurrent and earth-fault protection for cable feeders—minimizing outage impact through fast, coordinated tripping. Its compact size makes it ideal for gas-insulated switchgear (GIS) and pad-mounted transformers where space is limited.
In heavy industries such as oil & gas, mining, and manufacturing, the ABB REF542plus protects critical motor feeders, bus couplers, and auxiliary power systems. The integrated thermal overload model prevents motor burnout during jam or stall conditions, while programmable logic automates pump sequencing or transfer schemes—reducing reliance on external control systems.
For data centers and hospitals requiring high power availability, the ABB REF542plus enables rapid fault isolation and automatic restoration via its auto-reclose and breaker failure functions. When combined with arc flash detection, it significantly reduces incident energy during internal faults—enhancing personnel safety in live-maintenance scenarios. Its IEC 61850 compatibility also supports integration into enterprise-wide energy management platforms for real-time load profiling and predictive maintenance.
Related Products
REF541plus: Simpler variant of REF542plus with fewer I/O and no arc protection; suited for basic radial feeders.
REF543plus: Enhanced version with additional voltage inputs and synchrocheck; used for bus-tie or generator applications.
REF615: Higher-end Relion relay with dual Ethernet, more advanced arc protection, and higher sampling rates; for critical transmission feeders.
2RCA029396: Alternate order code for REF542plus with 1 A current inputs instead of 5 A.
2RCA029397: Version of REF542plus with extended I/O module pre-installed.
PCM600: ABB’s engineering tool for configuring, testing, and maintaining REF542plus and other Relion relays.
Installation and Maintenance
Pre-installation preparation: Before installing the ABB REF542plus, verify that CT/VT ratios match the relay configuration and that wiring complies with IEC 61850-3 grounding practices. Ensure the power supply voltage matches the unit’s rating (auto-ranging between AC/DC). Mount the relay on a standard 19″ rack or panel cutout using the provided brackets, allowing airflow around the unit. Use shielded twisted-pair cables for analog inputs and fiber-optic links for arc sensors if installed. Configure communication settings (IP address, VLAN, GOOSE datasets) using PCM600 before energizing.
Maintenance recommendations: The ABB REF542plus requires no routine calibration due to its solid-state design and self-monitoring diagnostics. However, perform annual functional tests using secondary injection to validate trip logic and timing. Review event logs and disturbance records quarterly to identify incipient faults or coordination issues. Keep firmware updated via ABB’s official channels to benefit from security patches and new features. If the ABB REF542plus is exposed to harsh environments, inspect the front gasket and terminal seals annually for integrity. Always back up configuration files after commissioning or modification.
