ABB REA101 Arc Protection Relay Most Favorable

Overview

The REA101 1MRS090416-AAA is an Arc Protection Relay (Central Unit) from ABB. It detects and isolates arc-flash faults in medium- and low-voltage switchgear. The relay operates standalone or with REA103, REA105, and REA107 expansion modules. It suits applications in power distribution, petrochemical, metallurgy, and industrial automation. The device mounts easily on a DIN rail or panel inside switchgear cabinets.

Technical Specifications

• Rated Voltage: 110/120/220/240 V AC or 110/125/220/250 V DC
• Operating Voltage: 24 V DC to 250 V DC, 100 V AC to 240 V AC
• 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)
• Output Devices: Two high-speed isolated IGBT outputs (HSO1 and HSO2) for circuit breaker tripping
• Inputs: Optical inputs for ring or radial fiber-optic sensors or lens sensors; binary inputs for external signals
• Communication Interfaces: RS-485 (Modbus RTU), hardwired contact outputs, two optical connectors for main module communication, two RJ45 ports for extension modules
• Protection Class: IP30 (cabinet installation)
• Operating Temperature: –25°C to +70°C
• Installation: DIN rail or panel mounting
• Weight: 6 kg
• Certifications: CE, UL, cUL, IEC 61508 SIL2