Abb+ufes+manual

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

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 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: Optical sensors (for light) and current transformers (for

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

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