ABB REA101-AA RLY-REA101-AAAG Arc Protection Relay – Obsolete RELION Spare Part

Technical Dossier

Product Details And Specifications

ABB REA101-AA RLY-REA101-AAAG Arc Protection Relay – Obsolete RELION Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Note: Electrical parameters such as input voltage range, trip time, and I/O configuration vary by installation. DriveKNMS does not publish unverified specifications. Contact us with your panel documentation for a compatibility confirmation before ordering.

Solving the Discontinued Hardware Crisis

The REA101-AA was designed specifically for arc flash detection in ABB's medium-voltage switchgear ecosystem. It operates as a dedicated arc protection unit — not a general-purpose relay — which means there is no off-the-shelf modern equivalent that installs without engineering rework. Facilities running ABB MNS or UniGear switchgear built between the late 1990s and early 2010s are the primary users of this relay. These panels were engineered around the REA101-AA's specific trip logic, fiber-optic arc sensor inputs, and communication interfaces. Replacing the relay with a current-generation IED requires new wiring, updated protection coordination studies, and in many jurisdictions, a formal re-commissioning inspection — a process that takes months and carries significant regulatory risk.

The economic case for sourcing a verified REA101-AA from the secondary market is straightforward: a single unit extends the operational life of an entire switchgear assembly by 5 to 10 years, deferring a capital project that most maintenance budgets are not structured to absorb. For plant managers operating under asset-sweating mandates, this is not a workaround — it is a documented maintenance strategy used by utilities and industrial operators worldwide.

Condition & Reliability Assurance

DriveKNMS applies a five-step quality process to every discontinued relay before it is offered for sale:

Units that do not pass all five stages are not sold as functional spares. Condition grade is disclosed on every order confirmation.

Key Features for System Maintenance

How do I know the unit is genuine ABB and not a counterfeit?
Every unit is inspected against ABB's original labeling standards, including part number format, date codes, and housing markings. We do not source from unverified channels. Documentation of the unit's provenance is available on request.