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The UFES manual outlines a specific sequence of events triggered by a fault:

The UFES is a combination of high-speed electronics and primary switching elements (PSE) designed to initiate a controlled three-phase short-circuit to earth. The system typically consists of:

The feeder circuit-breaker finally shuts down the resulting controlled earth fault current. Technical Specifications UFES | ABB - Core components abb+ufes+manual

The arc is extinguished in less than 4 ms total—20 times faster than standard protection.

A micro-gas generator in the PSE creates a low-impedance path to ground, causing the arc voltage to break down. The UFES manual outlines a specific sequence of

The electronic unit sends a trip signal to the PSE in less than 1 ms.

An expandable unit with internal light and current detection for small protection zones. A micro-gas generator in the PSE creates a

Optical sensors (for light) and current transformers (for overcurrent) identify the arc fault.

The manual provides critical instructions for installing, configuring, and maintaining one of the industry's fastest active arc-fault protection systems . By extinguishing internal arcs in less than 4 milliseconds , the UFES system significantly reduces the thermal and mechanical stresses that can destroy switchgear and endanger personnel. System Overview and Core Components

Three units that create the metallic short-circuit in less than 1.5 ms.