The ABB REA103-AA (Serial Number: EV360782) is a specialized extension module designed for use with the REA series arc fault protection system. This unit provides additional sensor inputs for detecting light radiation caused by an internal arc fault, which is critical for minimizing damage to switchgear and ensuring personnel safety. By integrating with a central REA101 unit, the REA103-AA allows for expanded coverage across multiple cubicles, offering high-speed detection and ultra-fast tripping capabilities in medium and low-voltage electrical systems.
Product Specifications (Datasheet)
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Model: REA103-AA
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Serial Number: EV360782
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Dimensions: 160 mm x 100 mm x 35 mm (H x W x D)
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Weight: 0.38 kg
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Country of Origin: Finland
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Sensor Inputs: 2 x Fiber Optic Sensor Loops (Long-range coverage)
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Communication Interface: Dedicated REA bus for interconnection
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Output Contacts: High-speed signaling relays for fault coordination
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Operating Temperature: -25°C to +55°C
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Protection Class: IP20 (Rear), IP40 (Front panel when mounted)
Key Application Fields
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Medium Voltage Switchgear: Rapidly isolating arc faults to prevent structural damage and fire.
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Power Utilities: Protecting transformer secondary sides and distribution busbars.
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Data Centers: Ensuring maximum uptime by preventing catastrophic electrical failures.
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Marine & Offshore: Compact and reliable protection for shipboard electrical distribution boards.
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Heavy Industry: Safeguarding high-current motor control centers (MCC) in mining and steel mills.
Product Usage Instructions
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Mounting: Install the REA103-AA module onto a standard 35mm DIN rail inside the switchgear cabinet. Ensure it is positioned close to the fiber optic entry points to minimize cable stress.
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Fiber Optic Installation: Connect the fiber optic sensor loops to the designated ports. The loop should be routed through the switchgear compartments where arc faults are most likely to occur. Avoid sharp bends in the fiber.
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System Connection: Use the shielded RJ45-style REA bus cable to link the REA103-AA back to the REA101 central unit. This bus provides both power and communication.
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Commissioning: Set the module address using the front-panel DIP switches if required by the system architecture. Verify the sensor loop integrity using the built-in test function on the central unit.
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Testing: Perform a light-pulse test on the fiber optic loop to ensure the module correctly identifies the simulated fault and signals the central unit.
Q&A: Frequently Asked Questions
Q: Does the REA103-AA operate as a standalone protection relay? A: No, the REA103-AA is an extension module. It must be connected to a central unit like the REA101, which processes the logic and issues the trip command.
Q: Can I use standard fiber optic patch cables as sensors? A: It is highly recommended to use the specific ABB plastic fiber optic (POF) sensors designed for the REA system, as they are calibrated for specific light sensitivity and environmental durability.
Q: What is the maximum length of the sensor fiber loop? A: Depending on the specific fiber type used, the loop can typically extend up to 40 meters to cover multiple switchgear sections.
Q: How do I identify a fault specifically on the REA103-AA module? A: The module features local LED indicators. A “Trip” or “Alarm” LED will illuminate when an arc is detected on its specific fiber loop, allowing for fast fault localization.
Discover the technical capabilities of the REA103-AA and enhance your power system safety with our full range of arc protection components.
Similar Model Recommendations
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ABB REA101: The central unit required to manage and trip based on signals from REA103 modules.
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