ABB REA101 Arc Fault Protection Relay

Description

The ABB REA101 is a fast and flexible arc fault protection relay designed for medium- and low-voltage switchgear. It detects arc faults using fiber-optic sensors and delivers trip signals within 2.5 milliseconds to minimize equipment damage and protect personnel.

Specifications

• Model: REA101

• Rated Voltage: 110/120/220/240 V AC or 110/125/220/250 V DC

• Control Current: Adjustable from 1.5 mA to 20 mA

• Operation Time: ≤ 2.5 ms from arc detection to trip signal

• Detection Method: Fiber-optic sensor-based arc-flash detection (AFD), optionally linked with overcurrent signals

• Communication Interface: RS-485 (Modbus RTU), hardwired contact outputs for multiple trip signals

• Operating Temperature: −25°C to +70°C

• Protection Rating: IP30 (cabinet installation)

• Certifications: CE, UL, cUL, IEC 61508 SIL2

• Installation: DIN rail or panel mounting

• System Compatibility: Works with REA103, REA105, REA107 extension modules

Features

• High-Speed Arc Detection: Detects arc faults within 2.5 ms using fiber-optic sensors

• Redundant Configuration: Supports dual-channel redundancy with expansion modules to eliminate single points of failure

• Multi-Protocol Communication: RS-485 interface with Modbus RTU for integration with DCS/SCADA systems

• Scalable Architecture: Expandable via REA103 (sensor extension) and REA105 (fast output) modules for large switchgear layouts

• Built-In Fault Indicators: Enables fast fault localization and guided maintenance

• Hot-Swappable Design: Supports maintenance without system shutdown

• Industrial Reliability: Designed for harsh environments and critical safety applications