Overview

The ABB REA101 is part of the REA arc protection system, engineered to detect and respond to arc faults in air-insulated switchgear panels. It uses optical sensors to detect the intense light emitted during an arc flash and can optionally combine this with overcurrent detection for enhanced selectivity.

This relay is designed to issue trip commands within milliseconds, significantly reducing the risk of injury and equipment damage. It supports modular configuration, allowing users to tailor the system to specific switchgear layouts. Moreover, it is compatible with IEC 61850-based automation systems, making it suitable for both new installations and retrofit projects.

The REA101 is widely used in power distribution, industrial plants, and renewable energy systems, where fast fault isolation is critical to maintaining operational safety and continuity.

Technical Data

Typical Applications

The REA101 is deployed in low- and medium-voltage switchgear to detect arc faults and initiate fast tripping of circuit breakers.

Examples include:

• Metal-clad switchgear panels, isolating a faulted compartment before pressure buildup or thermal damage occurs.

• Industrial substations, data centers, and critical infrastructure where personnel safety and asset protection are paramount.

Its modular design and flexible sensor options make it ideal for custom switchgear configurations and multi-compartment panels.

Additionally, its fast response and integration capabilities support digital substations, smart grid deployments, and IEC 61850-based automation systems.

FAQ

Q1: What type of faults does the REA101 detect?
A1: It detects arc faults using optical sensors and optionally verifies with overcurrent detection.

Q2: How fast does it respond to arc faults?
A2: It typically issues trip commands in less than 10 milliseconds.

Q3: What sensor types are supported?
A3: It supports bare-fiber sensors and lens-type sensors for flexible installation.

Q4: Is it compatible with IEC 61850 systems?
A4: Yes, it supports IEC 61850 and other standard protocols depending on the model.