The 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:
: These are the physical components that establish the three-phase short-circuit to earth. They feature a vacuum interrupter and a fast-acting micro gas generator. 2. Technical Specifications abb+ufes+manual
: The PSE closes, creating a 3-phase earth connection that bypasses the arc. The manual describes an active arc fault protection