ABB's Ultra-Fast Earthing Switch (UFES) provides active arc flash protection for medium and low-voltage switchgear by creating a controlled 3-phase short-circuit to earth, extinguishing arcs in less than 4 ms. The system uses electronic tripping units and primary switching elements (PSEs) to significantly reduce incident energy and damage, enhancing safety and reducing downtime compared to passive systems. For the full technical documentation, visit ABB Library UFES™ – Ultra-Fast Earthing Switch - ABB
< 4 ms after detection (Switching time of PSE < 1.5 ms). Voltage Range: Up to 40.5 kV. Short-circuit Currents: Up to 100 kA. abb+ufes+manual
The is a cutting-edge active arc fault protection system designed to extinguish internal arcs in less than 4 milliseconds . By rapidly creating a 3-phase metallic short-circuit to earth, the UFES system redirects uncontrolled arc energy into a controlled path, protecting personnel and minimizing equipment damage. System Architecture and Components ABB's Ultra-Fast Earthing Switch (UFES) provides active arc
: Uses optical lens sensors to detect the intense light of an arc and current transformers to detect the accompanying current spike. Operational Principles ABB UFES (Ultra-Fast Earthing Switch) The is a
UFES is a focused engineering tool for ABB and third-party fieldbus devices that streamlines discovery, configuration, commissioning, and diagnostics. Follow ABB’s device-specific manuals, back up configurations, and validate updates in a lab environment before applying them in production.