ABB REA101-AAA

Product Parameters and Specifications

The ABB REA101-AAA comes with the following technical specifications:

• Product Type: Arc Flash Protection Relay

• Series: ABB REA101

• Model Variant: REA101-AAA (standard configuration with basic I/O)

• Compatibility: Suitable for low and medium voltage switchgear up to 36 kV

• Arc Detection Method: Optical (light) detection via point sensors or fiber loop

• Sensor Inputs: 3 independent optical sensor inputs

• Sensor Types: Point sensors (REA101-SP) or fiber loop sensors (REA101-SL)

• Current Detection: Optional external current inputs for overcurrent confirmation

• Trip Time: < 2 ms (optical only), < 7 ms (with current confirmation)

• Output Relays: 2 trip relays (form-C, 8A/250VAC)

• Output Relay Contacts: 2 signal relays (form-C, 5A/250VAC)

• Digital Inputs: 1 digital input for external blocking or reset

• Communication: Optional RS485 Modbus RTU (dependent on variant)

• Indication: LED indicators for power, trip, sensor status, and communication

• Trip Indication: Channel-specific LEDs for identifying fault location

• Self-Supervision: Continuous monitoring of sensor loops and internal electronics

• Auxiliary Voltage: 24-48 VDC, 60-250 VDC/VAC (selectable)

• Power Consumption: < 5W typical

• Operating Temperature: -25°C to +55°C (-13°F to +131°F)

• Storage Temperature: -40°C to +85°C (-40°F to +185°F)

• Humidity: 5-95% RH non-condensing

• Vibration Resistance: 2g @ 10-150Hz per IEC 60255-21-1

• Shock Resistance: 15g @ 11ms per IEC 60255-21-2

• MTBF: > 200,000 hours at 40°C

• Dimensions: 105mm x 90mm x 60mm (H x W x D)

• Mounting: DIN rail mount (35mm) or panel mount with optional adapter

• Enclosure Material: UL94 V-0 rated polycarbonate

• Protection Rating: IP20 (terminals), IP40 (enclosure)

• Weight: 0.3 kg (0.66 lbs)

• Certifications: CE, UL, CSA, IEC 60947, IEC 60255, IEEE C37.90

Advantages and Key Features

The ABB REA101-AAA offers numerous advantages for arc flash protection applications:

Ultra-Fast Detection: The ABB REA101-AAA detects arc flash events in less than 2 milliseconds using optical sensors, significantly faster than conventional overcurrent protection which typically requires 50-100 ms. This ultra-fast response of the ABB REA101-AAA dramatically reduces arc flash incident energy, minimizing equipment damage and improving personnel safety.

Selective Arc Protection: With multiple independent sensor inputs, the ABB REA101-AAA enables selective tripping of specific switchgear compartments, isolating only the faulted section while maintaining power to unaffected areas. This selectivity of the ABB REA101-AAA minimizes production disruption during arc flash events.

Flexible Sensor Options: The ABB REA101-AAA supports both point sensors for compartment-level detection and fiber loop sensors for busbar coverage, allowing tailored protection schemes for different switchgear configurations. This flexibility of the ABB REA101-AAA ensures comprehensive arc coverage regardless of switchgear design.

Current Confirmation Capability: When connected to external current transformers, the ABB REA101-AAA can confirm arc faults by requiring both light detection and overcurrent before tripping, preventing nuisance trips caused by external light sources or sensor failures.

Compact DIN Rail Design: The small footprint of the ABB REA101-AAA allows easy installation in existing switchgear compartments without major modification, making arc flash retrofits practical and cost-effective for aging electrical infrastructure.

Self-Supervision Features: Continuous monitoring of sensor loops and internal electronics ensures that the ABB REA101-AAA remains ready to protect at all times, with any detected fault immediately annunciated for corrective action.

Channel-Specific Indication: Front panel LEDs on the ABB REA101-AAA indicate which specific sensor detected an arc flash, enabling maintenance personnel to quickly locate the faulted compartment without extensive troubleshooting.

Multiple Mounting Options: The ABB REA101-AAA supports DIN rail and panel mounting, providing installation flexibility for various switchgear designs and retrofit applications where space may be constrained.

Proven ABB Quality: As an authentic ABB component, the ABB REA101-AAA benefits from decades of protection relay expertise and comprehensive technical support, ensuring long-term reliability in critical safety applications.

Application Fields and Use Cases

The ABB REA101-AAA finds widespread application across numerous electrical power sectors:

Low Voltage Switchgear: The ABB REA101-AAA protects critical low voltage distribution switchgear in industrial facilities, commercial buildings, and data centers where arc flash incidents can cause extensive equipment damage and prolonged outages.

Medium Voltage Motor Control Centers: Industrial facilities utilize the ABB REA101-AAA to protect medium voltage MCCs feeding large motors in pump stations, compressor plants, and manufacturing lines where arc flash events pose significant safety risks to operating personnel.

Power Generation Switchgear: Thermal power plants, hydroelectric facilities, and combined cycle plants employ the ABB REA101-AAA to protect unit auxiliary switchgear and station service distribution systems essential for plant operation.

Substation Control Buildings: The ABB REA101-AAA protects low voltage AC and DC distribution panels within electrical substations, safeguarding critical control power for protection relays, SCADA equipment, and communication systems.

Data Center Distribution: Mission-critical data centers utilize the ABB REA101-AAA to protect power distribution units (PDUs) and remote power panels (RPPs) where arc flash events could cause extended IT equipment outages.

Mining Operations: Underground and surface mining facilities employ the ABB REA101-AAA to protect portable switchgear and distribution centers in challenging environments where personnel safety is paramount.

Marine and Offshore: Ships and offshore platforms utilize the ABB REA101-AAA to protect electrical distribution systems in confined spaces where arc flash events pose enhanced risks to personnel and essential equipment.

Industrial Manufacturing: Automotive plants, steel mills, and chemical facilities employ the ABB REA101-AAA to protect plant electrical distribution systems where production continuity depends on reliable power availability.

Comparison with Competing Products

When compared to similar offerings from competitors like SEL (SEL-751A), Eaton (Arc Flash Relay), or Schneider Electric (Vamp):

vs. SEL-751A Feeder Protection Relay: SEL offers excellent feeder protection with optional arc flash detection, but the ABB REA101-AAA provides dedicated arc flash protection with faster detection times optimized specifically for arc flash mitigation rather than general protection applications.

vs. Eaton ARCON Arc Flash Relay: Eaton’s ARCON system provides comprehensive arc protection, but the ABB REA101-AAA offers more flexible sensor options including both point and fiber sensors in a more compact form factor, simplifying installation in space-constrained switchgear.

vs. Schneider Electric Vamp Arc Protection: Schneider’s Vamp series offers sophisticated arc protection, but the ABB REA101-AAA delivers simpler configuration and operation for applications where dedicated arc protection without complex programming is preferred.

vs. Littelfuse PGR-8800: Littelfuse provides capable arc flash relays, but the ABB REA101-AAA benefits from ABB’s extensive switchgear integration experience, ensuring seamless compatibility with ABB switchgear designs and simplified retrofit installations.

Key Differentiator: The primary advantage of the ABB REA101-AAA lies in its combination of ultra-fast detection speed, flexible sensor options, and compact design specifically optimized for ABB switchgear integration, providing a complete arc protection solution from a single manufacturer.

Selection Suggestions and Precautions

When selecting the ABB REA101-AAA for your application, consider these important factors:

Switchgear Configuration Assessment: Before specifying the ABB REA101-AAA, conduct a thorough assessment of your switchgear configuration to determine optimal sensor placement. Identify all compartments requiring protection and evaluate accessibility for sensor installation when planning the ABB REA101-AAA system.

Sensor Type Selection: Choose appropriate sensor types for the ABB REA101-AAA based on switchgear design. Point sensors work well for discrete compartments such as breaker cells and cable compartments, while fiber loop sensors provide better coverage for continuous busbar sections monitored by the ABB REA101-AAA.

Current Confirmation Requirements: Determine whether your application requires current confirmation with the ABB REA101-AAA. While optical-only detection provides fastest response, current confirmation reduces nuisance trip risk in applications where external light sources may be present.

Trip Circuit Integration: Plan integration of ABB REA101-AAA trip outputs with upstream circuit breaker trip circuits. Verify compatibility with breaker trip coil ratings and ensure adequate auxiliary power is available for simultaneous tripping of multiple breakers if required.

Coordination with Existing Protection: Ensure that ABB REA101-AAA arc flash protection coordinates with existing overcurrent protection schemes. The ultra-fast operation of the ABB REA101-AAA should take precedence for arc faults, but coordination with backup protection must be maintained.

Environmental Considerations: Assess the installation environment for the ABB REA101-AAA. While rated for industrial environments, verify that temperature, humidity, and vibration levels remain within specified limits, particularly in outdoor switchgear or areas near high-vibration equipment.

Power Supply Reliability: Ensure reliable auxiliary power is available for the ABB REA101-AAA. Consider connection to uninterruptible power supplies to maintain protection capability during system disturbances when arc flash risk may be elevated.

Testing and Maintenance Planning: Develop regular testing procedures for the ABB REA101-AAA system, including sensor verification, trip circuit testing, and functional validation using ABB’s recommended test equipment and procedures.

Spare Parts Strategy: Maintain appropriate spare ABB REA101-AAA relays and sensors on-site to minimize downtime in case of component failure. Consider the number of protected compartments and required system availability when determining spare quantities.

Installation Expertise: Installation and configuration of the ABB REA101-AAA should only be performed by personnel trained on ABB protection systems and familiar with arc flash protection principles. Improper sensor placement or configuration can compromise protection effectiveness.

Documentation Requirements: Maintain complete documentation of ABB REA101-AAA installation, including sensor locations, wiring diagrams, configuration settings, and test records. This documentation is essential for troubleshooting and regulatory compliance.

Regulatory Compliance: Verify that your application of the ABB REA101-AAA complies with applicable electrical safety standards, including IEEE 1584 for arc flash hazard calculations and NFPA 70E for electrical safety in the workplace.