Model: REF542plus
Order Code: 76E1BBBB361WB31
Brand: ABB
Series: REF542plus (ProtectIT)
Core Function: Compact multifunctional protection, control, measurement, and monitoring unit for medium-voltage switchgear. Integrates feeder, motor, and transformer protection with bay control, measurements, and communication in a single device.
HS Code: 8536.30 / 8537.10 (Electrical apparatus for switching or protecting electrical circuits – confirm local classification)
Product Parameters
| Parameter | Specification |
|---|---|
| Product Type | Multifunction Protection & Control Relay / Feeder Terminal |
| Application | Medium-voltage switchgear (AIS/GIS), feeder, motor, transformer protection and control |
| Architecture | Base unit + separate Human Machine Interface (HMI) |
| Analog Inputs | Up to 8 channels (current & voltage from CTs/VTs or sensors) |
| Binary I/O | Multiple binary input/output modules (configuration dependent on order code) |
| Power Supply | Typically 48–220 V DC or specific rated voltage (variant dependent) |
| Protection Functions | Overcurrent (50/51), Earth fault (51N/67N), Directional, Thermal overload (49), Inrush blocking, Motor protection, etc. |
| Measurement | Current, voltage, power, energy, frequency, power factor (Class 0.5 / 1) |
| Control Functions | Switchgear control, interlocking, autoreclose, status monitoring |
| Communication | Optional modules supporting SPA, LON, Modbus RTU/TCP, IEC 60870-5-103, Ethernet |
| Housing | Wide or Standard (Wide indicated in this order code) |
| HMI | Detached graphical display with LEDs, keys, and optional electronic key |
| Operating Temperature | Typically –10 °C to +55 °C |
| Protection Degree | Base unit IP20; HMI front IP44 / IP54 (with cover) |
Advantages and Features
- All-in-one solution: Protection + Control + Measurement + Monitoring in a single unit
- High flexibility through programmable logic and configurable I/O
- Separate HMI allows flexible mounting (door or panel)
- Supports both conventional CTs/VTs and non-conventional sensors
- Advanced motor protection functions available (including ATEX versions in some variants)
- Fault recording, event logging, and power quality functions
- Multiple communication protocols for easy integration into substation automation systems
- Self-diagnostics and continuous monitoring for high reliability
- IndustrialIT certified for seamless integration in ABB systems
Application Cases in Application Fields
- Medium-voltage feeder protection and control in distribution substations
- Motor protection and control in industrial plants and process industries
- Transformer protection and bay control
- Air-insulated (AIS) and gas-insulated (GIS) switchgear
- Marine and offshore applications (DNV versions available)
- Renewable energy and industrial power distribution systems
- Retrofit of existing switchgear with modern protection and control
Comparisons with Competing Products
| Aspect | ABB REF542plus | Traditional Discrete Relays | Modern Numerical Relays |
|---|---|---|---|
| Integration Level | Protection + Control + Measurement | Separate devices | High integration |
| Flexibility | Highly programmable | Limited | High |
| HMI | Separate graphical HMI | Local or none | Built-in or separate |
| Communication | Multiple protocols available | Limited | Advanced (IEC 61850 common) |
| Footprint | Compact base + HMI | Larger when combining functions | Compact |
| Best For | MV switchgear requiring combined functions | Simple protection only | New digital substations |
Selection Suggestions and Precautions
Selection Suggestions:
- Confirm the exact hardware configuration (analog inputs, binary I/O modules, communication board, power supply, HMI type) matches the order code 76E1BBBB361WB31.
- Verify compatibility with existing CTs, VTs, and switchgear control circuits.
- Choose the appropriate software license and configuration tool for the required protection scheme.
- For motor protection in hazardous areas, confirm if an ATEX-certified variant is required.
Precautions:
- Configuration of protection functions is typically performed using ABB-specific tools and may require factory or authorized engineering support.
- Ensure correct CT/VT ratios and polarity during commissioning.
- Follow ABB installation guidelines for grounding, wiring, and EMC compliance.
- The unit should be configured and tested according to the specific application and network conditions.
- Regular proof testing and maintenance are recommended for safety-critical applications.
- This is a configured product — always verify the nameplate and order code against project requirements before installation.
Recent Popular Same-Brand / Related Models
- Other REF542plus variants with different I/O, communication, or housing configurations
- REF615 / REF620 (newer Relion® series feeder protection relays)
- REM615 / REM620 (motor protection)
- RET615 (transformer protection)
- REX615 (all-in-one protection and control)
