ABB REU610 Voltage Protection Relay for Relion® 610 series

The ABB REU610 is a voltage relay designed for system voltage protection, measurement, and supervision in both utility and industrial power systems. As part of the Relion® 610 series, it provides reliable protection for feeder systems, motors, transformers, and capacitor banks.

Key Features:

Model: REU610
Product Type: Voltage protection relay
Series: ABB Relion® 610 series
Design: Compact, plug-in unit for quick installation and maintenance
Testing & Certification:
- KEMA type-tested
- Certified for marine and offshore use by Det Norske Veritas (DNV)

Protection & Applications:

System voltage supervision
Over-voltage & under-voltage protection for:**
- Distribution substation busbars
- Feeders and power transformers
- Motors and capacitor banks
Residual voltage-based earth-fault protection (for isolated neutral power systems)
Automatic busbar changeover and islanding detection

Integrated Protection Functions:

Two-stage overvoltage protection
Two-stage undervoltage protection
Two-stage residual overvoltage protection
Optional:
- Single-stage negative phase-sequence overvoltage protection (mutually exclusive with the option below)
- Single-stage positive phase-sequence undervoltage protection