ABB REF542PLUS 76A3NFNN361SU36 is a high-performance multifunctional protection and control IED designed for medium-voltage power distribution systems up to 40.5kV. It integrates complete protection, measurement, control, monitoring, communication and self-diagnosis in one compact unit, ideal for feeders, transformers and motors in air-insulated or gas-insulated switchgear.

Core Functions

• Comprehensive Protection: Overcurrent, earth-fault, over/under voltage, frequency supervision, arc flash mitigation and fault location ensure selective and fast fault clearance.
• Precise Measurement & Power Quality: Real-time current, voltage, power and energy monitoring with power quality analysis and fault recording for reliable data support.
• Flexible Control & Automation: Built-in logic programming, auto-reclosing, synchro-check, trip circuit supervision and local/remote switchgear control.
• Strong Communication: Native support for IEC 61850, Modbus and DNP3 enables seamless integration with SCADA, DMS and substation automation systems.
• User-Friendly Design: Separate HMI with backlit LCD, multi-language interface and flexible installation for easy operation and maintenance.
• High Reliability: Full self-diagnosis, EMC immunity and robust aluminum housing guarantee stable performance in industrial and utility environments.