Product Overview
- Type: Numerical Protection Relay
- Series: REF542 Plus (ABB Relion® family)
Application:
- Feeder protection in MV switchgear (UniGear, ZS1)
- Motor/generator protection
- Industrial power system automation
Key Features
- ✔ Integrated protection functions (overcurrent, earth fault, thermal overload)
✔ Advanced control capabilities
✔ IEC 61850 communication (standard)
✔ Modbus RTU/Profibus options
✔ LCD interface for local operation
Technical Specifications
Parameter Value
- Rated Voltage 48-250V DC/100-240V AC
Protection Functions 50/51, 50N/51N, 49, 27/59
Digital Inputs 16 (expandable)
Digital Outputs 8 (expandable)
Communication IEC 61850, Modbus, Profibus
Mounting Panel-mounted
Ordering Information
- ABB Article No.: 2RCA029395
- Revision: A0015 (specific hardware/software version)
- Compatible with: ABB UniGear switchgear
Documentation
- REF542 Plus Technical Manual (ABB document 1VCD…)
- IEC 61850 Configuration Guide
- Relion® Product Catalog
Support & Migration
- For firmware updates: Contact ABB Automation Support
- Consider newer REF615 for upgrades