Optical sensors (for light) and current transformers (for overcurrent) identify the arc fault.
: The fault current is finally cleared by the feeder circuit-breaker, which may also be triggered by the UFES electronics to shorten total breaking time. Key Technical Specifications Rated Voltage Up to 40.5 kV Rated Short-Time Current Up to 100 kA Switching Time (PSE) Total Extinguishing Time < 4 ms (after detection) Service Life Expectancy Up to 30 years Installation and Retrofitting
Extinguishes arcs within
Proper mechanical and electrical installation is critical. A single loose connection can cause system failure or unwanted tripping. Environmental Conditions abb+ufes+manual
Do you need assistance with a of the UFES system (such as QRU1 or QRU2)? Share public link
…I’ll be happy to give you a structured, detailed review.
The UFES creates a solid, three-phase short circuit to earth immediately upon detecting an arc. This rapid grounding diverts the energy away from the arc fault, extinguishing it before destructive pressure and thermal energy can develop. Key Benefits Optical sensors (for light) and current transformers (for
The QRU electronic unit features sophisticated self-monitoring loops. If an issue arises, it will trigger an alarm contact and display an error state.
The ABB UFES manual highlights various applications across industries, including:
I can provide the exact wiring diagrams or diagnostic steps for your setup. Share public link A single loose connection can cause system failure
Replace all fired UFEA primary switching elements with new, certified units from ABB.
A standalone unit with 3 current and 9 optical inputs for light detection.
Mariana turned the key