Abb+ufes+manual Better (VALIDATED)

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

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

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

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

An expandable unit with internal light and current detection for small protection zones.