[2021] | Abb+ufes+manual

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 electronic unit sends a trip signal to the PSE in less than 1 ms. The UFES is a combination of high-speed electronics

A micro-gas generator in the PSE creates a low-impedance path to ground, causing the arc voltage to break down. abb+ufes+manual

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