: The PSE closes in less than 1.5 ms , creating a low-impedance earthing path that extinguishes the arc by collapsing its voltage. Key Technical Specifications Rated Voltage : Up to 40.5 kV. Short-time Withstand Current : Up to 100 kA. Total Extinguishing Time : Less than 4 ms after detection.
If the UFES indicates a fault or fails to arm, refer to this diagnostic guide.
[ Visual Inspect ] ──► [ Dielectric Test ] ──► [ Fiber Integrity Check ] ──► [ Secondary Circuit Test ] Visual Inspection
Uses a micro gas generator (similar to automotive airbags) to drive a high-speed piston. 🏗️ System Components The UFES consists of two main hardware categories: abb+ufes+manual
During normal operations, the UFES system requires no human intervention. The QRU continuously runs self-diagnostics. A green "READY" LED indicates the system is fully armed. What Happens During an Arc Fault Event? An arc occurs; light and current thresholds are exceeded.
The coupling unit sends a fast electrical firing pulse to the U1 elements.
If you can share (e.g., product photo, exact label text, or where you saw "ABB+UFES"), I can help you locate the exact manual. : The PSE closes in less than 1
: A complete, expandable solution with internal light and current detection for small protection areas.
Because the arc was extinguished so quickly, structural switchgear damage is usually minimal (mostly minor soot that can be wiped away).
"An internal mirror," she whispered. "From a professor who retired a decade ago. Look." Total Extinguishing Time : Less than 4 ms after detection
The control intelligence of the UFES is managed by one of two electronic units:
The system consists of two primary parts that work together to mitigate arc flash energy:
By quenching the arc so quickly, the system reduces the pressure rise and thermal stress, often preventing any visible damage to the switchgear compartment. Benefits for Your Facility UFES™ Ultra-Fast Earthing Switch - ABB
Internal arc faults represent one of the most severe hazards within low- and medium-voltage switchgear systems. During such an event, the sudden release of energy can result in arc temperatures exceeding 20,000°C, extreme pressure, and acoustic blasts. Traditional protection systems often react too slowly, leading to catastrophic equipment damage or severe injury.