Abb+ufes+manual Exclusive May 2026

The ABB UFES (Ultra-Fast Earthing Switch) is an active arc-fault protection system designed to extinguish internal arcs in less than 4 milliseconds.

The ABB UFES (Ultra-Fast Earthing Switch) manual describes an active arc fault protection system designed to mitigate the thermal and mechanical stresses of internal arc faults in medium-voltage and low-voltage switchgear. By initiating a 3-phase short-circuit to earth, the system extinguishes an arc in less than 4 ms after detection, which is up to 20 times faster than standard protection. System Components The UFES kit typically consists of two primary components: abb+ufes+manual

Primary Switching Elements (PSE): Three single-phase elements that initiate a three-phase short-circuit to earth to break the arc voltage. Functional Principle The ABB UFES (Ultra-Fast Earthing Switch) is an

The system is designed for easy integration into both new and existing switchgear. New Switchgear System Components The UFES kit typically consists of

Tripping: Once a fault is confirmed based on set thresholds, the electronic unit sends a trip signal to the PSE.