ABB REA 103 Arc Protection Relay Extension Module

ABB REA 103 Arc Protection Relay Extension Module 

Product Description: For sale is a professional ABB REA 103 Arc Protection Module in excellent pre-owned condition. This extension unit is designed for rapid and selective arc fault mitigation in low and medium-voltage air-insulated switchgear environments. Operating as a downstream extension unit for the main REA 101 protection system, it significantly expands light detection coverage via additional fiber-optic sensor channels. The unit has been carefully reclaimed from a clean, fully operational environment, thoroughly inspected, and features a verified QA "PASSED" sticker on its housing.

Technical Specifications:

• Manufacturer: ABB

• Model / MPN: REA 103 / REA103

• Device Type: Arc Protection Extension Module

• Serial Number: ES463407

• Condition: Used (Excellent cosmetic and technical condition)

• Interfaces: Optical ports Sensor 1 (IN/OUT), Sensor 2 (IN/OUT), communication ports X2 (PORT IN), X3 (PORT OUT)

• Terminal Block: Removable 10-pin connector (X1)

• Monitoring Functions: Integrated continuous self-supervision for internal operating voltages and sensor fiber integrity

Application: The REA 103 module is utilized within complex relay protection and automation systems (RZA) to safeguard switchgear cubicles from the destructive thermal effects of an electric arc flash. It is typically deployed to scale up the number of monitored zones—such as cable compartments or busbar bridges—where radial or loop fiber-optic sensors record light flashes. This setup ensures instantaneous fault localization, tripping the appropriate circuit breakers to minimize critical equipment damage and guarantee the safety of maintenance personnel.