ABB REA101 Arc Protection Relay Central Unit MV LV Switchgear

Product Description

Overview

The ABB REA101 is a high-speed central unit for arc fault protection in medium-voltage (MV) and low-voltage (LV) air-insulated switchgear. Designed to operate independently or in conjunction with extension modules (REA103, REA105, REA107), it provides scalable protection over extensive switchgear layouts. By rapidly detecting arcs and isolating the affected section, it reduces equipment damage and enhances personnel safety.

Key Features

• Ultra-fast arc detection using fiber-optic sensors and overcurrent monitoring

• Supports loop-type or radial fiber arrangements for flexible coverage

• Dual high-speed semiconductor trip outputs plus relay output for selective tripping

• Two extension ports, each supporting up to five expansion units

• Continuous self-supervision of fiber integrity, voltages, and inter-module communications

• Circuit breaker failure protection with delayed output for upstream breakers

• Fault location indicated at the specific sensor or extension module

Technical Specifications

System Expansion

• REA103: Adds additional fiber loops for wide-area coverage

• REA105: Includes extra high-speed trip outputs for complex selective tripping

• REA107: Supports point sensors for monitoring individual compartments

Application Scenarios

Ideal for medium and low-voltage switchgear in industrial plants, utilities, and commercial installations requiring high-speed arc fault detection and selective tripping across multiple switchboard sections.

FAQ

Q: Can the REA101 operate standalone?
A: Yes, it can function independently for smaller switchgear setups.

Q: How many extension units can be linked?
A: Each REA101 port supports up to five expansion units, allowing up to ten per central unit.

Q: Does it support integration with SCADA systems?
A: Yes, RS-485 Modbus RTU enables monitoring and control through SCADA or power management systems.

Q: What is the difference between REA103 and REA105?
A: REA103 extends sensor coverage, while REA105 adds high-speed trip outputs for selective tripping.