ABB REF620E_F NBFNAAAANDA1BNN1 | Feeder Protection Relay

Module 2: The 10-Second Procurement Snapshot

• Brand: ABB
• Full Model Number: REF620E_F NBFNAAAANDA1BNN1
• Lifecycle Status: Legacy / lifecycle status requires confirmation
• Core Function: Feeder protection, control, measurement, and supervision
• Top 3 Technical Specs: 5-inch LCD; IEC 61850 communication; 3-phase feeder protection*
• Stock & Condition: New Surplus / Tested Refurbished; physical stock and dispatch time confirmed per unit

*Exact hardware configuration depends on the ordering code. Confirm the complete configuration string against the installed relay before purchase.

Module 3: Supply Chain & Technical Deep Dive

A failed feeder protection relay is a very different procurement problem from a routine PLC spare. The replacement must match the protection scheme, communication architecture, I/O configuration, and application settings. ABB REF620E_F is part of the Relion 620 series and is designed for protection, control, measurement, and supervision of distribution feeders. That makes an exact ordering-code match important when replacing a field unit.

From a TCO perspective, keeping one verified spare can make sense when the relay protects a production-critical feeder. REF620-class relays support functions such as feeder overcurrent and earth-fault protection, voltage and current measurement, disturbance recording, and IEC 61850-based substation communication. Exact protection functions and hardware interfaces vary by configuration, so do not infer the complete function set from the REF620 family name alone. Check the relay’s configuration and application manual before approving the purchase.

Module 4: Migration, Compatibility & Field Traps

Replacement Matrix

⚠️ Field Trap 1 — Configuration Mismatch

The relay’s ordering code determines more than its front-panel appearance. I/O, communication interfaces, and application features can vary.

Before removal:

1. Export the existing relay configuration.
2. Record firmware revision.
3. Save protection settings.
4. Photograph terminal wiring.
5. Record communication parameters.
6. Save disturbance records if required for the maintenance file.

Do not load an old configuration blindly. Verify the hardware configuration first.

⚠️ Field Trap 2 — CT and VT Wiring

Protection relays are not forgiving of incorrect CT or VT wiring.

Check:

• CT polarity
• Phase sequence
• CT secondary grounding
• VT connection
• Residual current circuit
• Binary input wiring
• Trip output wiring

After installation, perform secondary-injection or approved protection testing before returning the feeder to service.

ABB REF620E_F NBFNAAAANDA1BNN1

Module 5: Quality Assurance & Testing SOP

A protection relay should be treated as a protection-system component, not simply as an electronic spare.

1. OEM Identification Inspection

• Verify ABB branding.
• Match REF620E_F and the complete ordering code.
• Record serial number and hardware revision.
• Inspect terminal blocks and communication connectors.
• Check the LCD and front-panel controls.
• Inspect for corrosion, cracks, heat damage, or repair evidence.
• Photograph the identification label.

2. Power-On Self-Test

Using an approved test arrangement:

• Apply the specified auxiliary supply.
• Check startup sequence.
• Confirm LCD operation.
• Check status LEDs.
• Review self-diagnostic messages.
• Record any active alarms.
• Confirm the relay reaches its normal operating state.

3. Communication Test

Verify the interfaces required by the actual application:

• IEC 61850 communication
• Ethernet link
• Engineering-tool connection
• Station communication
• Time synchronization, where configured

The exact communication interface must follow the supplied hardware configuration.

4. Protection Function Test

Where the proper protection test equipment is available:

• Inject phase currents.
• Verify pickup values.
• Verify operating times.
• Test earth-fault functions where configured.
• Check binary inputs.
• Check trip outputs.
• Verify measured current and voltage values.
• Review event records.

For a production-critical relay, a protection test report should accompany the unit whenever practical.

5. Final QC

• Serial number recorded
• Hardware revision recorded
• Firmware recorded
• Functional test completed
• Protection test results archived
• ESD packaging applied
• Shock protection installed
• QC inspection signed
• Shipment photographs retained

ABB REF620E_F NBFNAAAANDA1BNN1

Module 6: Procurement-Driven FAQ

1. Is this exact REF620E_F configuration in stock, and can it ship overnight?

Physical stock should be confirmed against the complete ordering code NBFNAAAANDA1BNN1, not simply the REF620 family name. For emergency replacement, confirm the unit’s condition, test status, serial number, and carrier cutoff before placing the order.

2. How do you verify a surplus REF620E_F relay before shipment?

The unit should undergo identification, physical, power-on, diagnostic, communication, and—where suitable equipment is available—protection-function testing. The test record should identify the actual relay tested.

Ask for photographs of the label and test evidence if the replacement is being purchased for an outage-critical application.

3. What warranty applies if the relay fails after installation?

The warranty period and return procedure should be stated on the quotation or purchase order. For protection equipment, clarify whether the warranty covers the relay itself and what evidence is required for a failure claim.

4. Could firmware differences affect replacement compatibility?

Yes. Firmware and PCM600 configuration compatibility should be checked before commissioning. Record the existing relay firmware before removal, then compare it with the replacement unit and the saved project.

5. Can I install this relay and simply restore the old settings?

Not without verification. The protection settings may transfer, but the hardware configuration, I/O assignments, communication parameters, firmware, and protection logic must match the replacement relay. After configuration, perform the required protection and trip-circuit tests before energizing the feeder.