GE REF620E_1G NBFNAAAAABC6BBN11G Feed line protection and control device

Disassembly of Model Name
Model: REF620E_1G
Order Code: NBFNAAAAABC6BBN11G
Manufacturer: ABB (part of the Relion® 620 series)
Type: Feeder Protection & Control Relay

Basic Positioning and Usage
It is used for medium-voltage distribution networks, industrial substations, plant power supplies, distributed energy grid connections, etc.
Protected objects: cables / overhead feeders, small motors, capacitor banks.
Core functions: overcurrent, grounding faults, directional overcurrent, zero-sequence protection, measurement, control, fault location, communication.
Core Technical Parameters (REF620E_1G)
Power supply: 100–240 V AC/DC, 50/60 Hz
Current input: 4 channels, 1A/5A selectable
Voltage input: 3-phase voltage + zero-sequence voltage
Input signals: 24–32 channels, 24–250 VDC
Output signals: multiple relay outputs, 250 VAC/5A
Communication: IEC 61850, Modbus, DNP3, IEC60870-5-103
Display: LCD Chinese / English, key operation
Environment: -20℃ ~ +70℃, IP40
Size (width × height × depth): approximately 210×140×124 mm
Meaning of Order Code NBFNAAAAABC6BBN11G (Simplified)

This string represents the internal configuration bits of ABB, which are as follows in sequence:
N: Complete relay (without coating)
B: Standard IEC version
F: Basic function package
N: Enclosure / Installation type
5–8. AAAA: Protection function combination (overcurrent, grounding, voltage, etc.)
9–10. BC: Input / Output point configuration
6: Communication and port options
12–13. BB: Power supply and rated value
14–15. N1: Firmware and language
G: Special options / Customization
(Each bit needs to be checked in the official ABB ordering manual. The above are general rules.)
Relationship with GE
There was indeed a GE Multilin protection relay in the early days, but REF620 is an ABB product line and has nothing to do with GE.
The GE mentioned in your model should be a mislabeling.
VI. Summary of Applicable Scenarios
Industrial plant power distribution, substation feeder lines
Protection of photovoltaic / wind power connection points
Replacement of old electromechanical relays to achieve digital and networked protection