ABB REA107-AA Fail-Safe Arc Protection Relay

Overview

ABB REA107-AA Fail-Safe Arc Protection Relay: Critical Arc Fault Defense for Industrial Control Reliability

The ABB REA107-AA is a high-performance arc protection relay from ABB’s proven REA Series, engineered to deliver fail-safe arc fault detection in medium-voltage switchgear, motor control centers, and critical industrial control cabinets. Designed for continuous production environments where an undetected arc flash event can cause catastrophic equipment damage, personnel injury, and unplanned downtime, the REA107-AA provides sub-cycle arc fault detection that isolates faults before they escalate into full arc flash incidents.

In demanding industrial sites — including petrochemical plants, power generation facilities, mining operations, water treatment stations, metallurgical complexes, and port infrastructure — arc faults represent one of the most severe risks to both personnel safety and operational continuity. The REA107-AA addresses this risk through optical arc detection combined with overcurrent supervision, ensuring that only genuine arc fault conditions trigger tripping, while eliminating nuisance operations caused by electromagnetic interference, voltage fluctuations, or transient surges common in heavy industrial environments.

The relay’s robust design tolerates high-EMI environments, dusty and humid enclosures, elevated ambient temperatures, and mechanical vibration — conditions routinely encountered in steel mills, offshore platforms, and continuous manufacturing lines. Its deterministic response time — typically within one millisecond of arc detection — dramatically reduces arc flash incident energy, protecting switchgear busbars, cable terminations, and downstream control components from thermal and pressure damage.

For control cabinet integrators and plant engineers specifying a complete arc protection strategy, the REA107-AA is frequently deployed alongside complementary ABB components. The ABB REA101 arc protection central unit coordinates multiple sensor inputs and provides system-level fault management, while ABB REAO01 arc sensor loops extend optical detection coverage across large switchgear assemblies. In power supply architectures, pairing the REA107-AA with ABB UNS0881 or equivalent redundant DC power supply modules ensures that the protection relay itself remains energized and operational even during upstream power disturbances. For communication-intensive substations, integration with ABB REB500 busbar protection or ABB REF615 feeder protection relays via IEC 61850 GOOSE messaging enables coordinated, system-wide fault isolation — minimizing the risk of cascading failures across interconnected protection zones. Where surge and transient protection is required at the cabinet entry point, ABB OVR series surge protective devices complement the REA107-AA by clamping voltage spikes before they reach sensitive relay input circuits.

Every REA107-AA unit supplied by KNMKS undergoes pre-shipment functional testing, verifying arc detection sensitivity, overcurrent supervision thresholds, output relay operation, and power supply integrity. Units are sourced from authorized distribution channels and carry a support terms confirmed by quotation covering manufacturing defects and functional failures under normal operating conditions. Stock is maintained to support urgent replacement requirements, minimizing the risk of extended outages caused by spare parts lead times.

Fail-Safe Reliability Table

Control Cabinet Protection Strategy

A robust arc protection strategy for medium-voltage switchgear and industrial control cabinets extends well beyond a single relay. The REA107-AA serves as the detection and tripping core, but its effectiveness is maximized when integrated into a layered protection architecture. The ABB REA101 central unit aggregates signals from multiple REA107-AA modules and arc sensor loops, providing zone-selective arc protection across large switchgear lineups — a critical capability in substations with multiple incoming feeders and bus sections.

Optical arc sensor loops (ABB REAO01 series) are routed along busbars, cable compartments, and breaker cubicles to provide 360° arc detection coverage, ensuring that arc faults in any compartment are captured within the relay’s response window. For control cabinets operating in environments with significant conducted and radiated EMI — such as those adjacent to large variable frequency drives, arc furnaces, or high-power motor starters — the REA107-AA’s overcurrent supervision channel provides an essential second confirmation layer, preventing spurious trips from optical noise or ambient light ingress.

Power supply reliability is equally critical: the REA107-AA must remain operational during the very fault conditions it is designed to detect. Redundant auxiliary power supply modules, such as those from the ABB CP series or equivalent DIN-rail DC UPS units, ensure uninterrupted relay power during upstream voltage dips or momentary outages. Surge protective devices at the cabinet power entry point — including ABB OVR series SPDs — clamp transient overvoltages that could otherwise damage relay input circuits or cause false operations. For facilities using IEC 61850-based protection coordination, the REA107-AA’s compatibility with GOOSE messaging enables high-speed, peer-to-peer trip commands to ABB REF615 feeder protection relays or ABB REB500 busbar protection systems, achieving coordinated fault isolation across the entire protection zone without relying on hardwired intertripping schemes.

Critical Industrial Safety Applications

Petrochemical & Refinery Plants: In continuous process facilities where unplanned shutdowns carry enormous financial and safety consequences, the REA107-AA protects MV switchgear feeding critical pump motors, compressors, and process heaters. Its sub-millisecond arc detection prevents arc flash events from propagating into adjacent switchgear sections, maintaining process continuity and protecting personnel working in energized electrical rooms.

Power Generation & Transmission Substations: Generator step-up transformers, unit auxiliary transformers, and station service switchgear represent high-consequence protection zones. The REA107-AA, coordinated with busbar and feeder protection relays, provides a dedicated arc flash protection layer that operates independently of conventional overcurrent protection — ensuring that arc faults are cleared even when fault current levels are insufficient to operate standard overcurrent elements.

Mining & Mineral Processing: Underground and surface mining operations subject electrical equipment to extreme dust loading, humidity, vibration, and mechanical shock. The REA107-AA’s environmental robustness and deterministic response make it well-suited for protecting MV switchgear in dragline, conveyor, crusher, and ventilation fan circuits — applications where arc flash incidents in remote locations can result in extended production outages and complex rescue operations.

Water & Wastewater Treatment: Pump station and treatment plant switchgear operates in high-humidity, chemically aggressive environments. The REA107-AA provides arc protection for MV motor starters and distribution switchgear, reducing the risk of arc flash incidents in facilities where electrical maintenance access is frequent and personnel exposure to energized equipment is unavoidable.

Metallurgy & Steel Production: Arc furnace facilities and rolling mill substations generate extreme levels of electromagnetic interference and voltage disturbances. The REA107-AA’s overcurrent supervision prevents nuisance tripping in these high-EMI environments while maintaining the fast arc detection response required to protect switchgear from the high fault currents available in heavy industrial power systems.

Port & Marine Infrastructure: Shore power systems, ship-to-shore crane substations, and vessel electrical distribution systems require arc protection solutions that perform reliably in salt-laden, humid, and vibration-intensive environments. The REA107-AA’s environmental ratings and compact form factor make it suitable for marine-grade switchgear and offshore platform electrical rooms.

Safety and Quality FAQ

Q1: What support terms does the ABB REA107-AA carry when purchased from KNMKS?
Every ABB REA107-AA supplied by KNMKS is covered by a support terms confirmed by quotation against manufacturing defects and functional failures under normal operating conditions. Support terms support includes technical diagnosis, replacement coordination, and documentation to support plant maintenance records.

Q2: Is the REA107-AA tested before shipment?
Yes. Each unit undergoes pre-shipment functional testing covering arc detection sensitivity, overcurrent supervision operation, output relay contact integrity, and auxiliary power supply performance. Test records are available upon request for quality assurance and maintenance documentation purposes.

Q3: Is the ABB REA107-AA compatible with existing ABB REA Series arc protection systems?
The REA107-AA is designed for integration within ABB’s REA Series arc protection architecture, compatible with REA101 central units and REAO01 optical sensor loops. For IEC 61850-based substations, GOOSE-compatible coordination with ABB REF615, REB500, and other protection IEDs is supported through the system’s communication architecture. Confirm specific firmware and hardware revision compatibility with your system integrator or ABB technical support before installation.

Q4: Can KNMKS support long-term supply and emergency replacement for the REA107-AA?
Yes. KNMKS maintains stock of the ABB REA107-AA to support both planned maintenance programs and emergency replacement requirements. For critical facilities with zero-tolerance for extended outages, we recommend establishing a consignment or reserved stock arrangement. Contact our sales team at admin@knmks.com or +86 18359268345 to discuss supply agreements and lead time commitments.

© 2026 KNMKS. All rights reserved.
Original Source: https://knmks.com
Contact: admin@knmks.com | +86 18359268345

Product Identification

Brand / Ecosystem

ABB
ABB

Model / Series

REA107-AA RLY-REA107-AA

Product Family

Sensors

Availability Status

Available on request after model and quantity confirmation

Inquiry Type

B2B RFQ, replacement inquiry and project spare-part request

Pre-Quote Check

Exact SKU, brand, series, quantity, nameplate photos and destination country are checked before quotation

Specification & Inquiry Focus

Sensor range

Photoelectric, proximity and process sensors

Common needs

Output type, distance and connector

Project support

Machine detection and replacement inquiry

Inquiry Support

• NPN/PNP, analog and digital output checking
• Connector and cable compatibility review
• Fast inquiry support for maintenance teams

What to Send Us

• Brand and exact model number: ABB REA107-AA RLY-REA107-AA
• Quantity and required delivery time
• Application, replacement requirement or nameplate photo
• Destination country and shipping preference