The ABB Ultra-Fast Earthing Switch (UFES) is an active arc fault protection system that extinguishes faults in under 4 milliseconds, significantly reducing pressure rise and equipment damage. The system utilizes Electronic Units (QRU100/QRU1) for detection and Primary Switching Elements (PSE) for earthing, available in loose, service box, or draw-out configurations for new or retrofit applications. For detailed technical documentation and manuals, visit ABB Library . UFES™ – Ultra-Fast Earthing Switch - ABB
The electronic unit sends a trip signal to the PSE in less than 1 ms. abb+ufes+manual