REF620 - Relay Order Code NAFAABA3FFxxxAx1xx - Electrical Single-Line and Wiring Diagrams

Oct 25, 2026

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REF620 documentation provides electrical engineering schematics for a distribution feeder application, including a typical SINGLE LINE DIAGRAM, front panel elevation, and AC/DC schematic diagrams. It specifies relay order code NAFAABA3FFxxxAx1xx and maps phase and ground voltage/current signals (VA, VB, VC, VG; IA, IB, IC, IG) plus binary I/O and high-speed outputs. The drawings cover protection/command functions, VT connection settings for Wye and open-delta metering considerations, and power supply and I/O interconnections for inputs, outputs, and external blocking logic.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages7

Reading Time18 min

AccessFree to download

Typical SINGLE LINE DIAGRAM (TYPICAL)

Front Panel Elevation

AC SCHEMATIC (TYPICAL)

DC SCHEMATIC INPUTS (TYPICAL)

DC SCHEMATIC: POWER SUPPLY AND OUTPUTS

DC SCHEMATIC INPUTS/OUTPUTS (TYPICAL)

CONNECTION DIAGRAM-RELAY

| | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | General Note:
Functions shown in this drawing are for a distribution feeder application (87LOZ REF function is not shown) . | Notes:
1. Rotary switch emuilates drop down menu for "Pol Signal Sel" paameter setting in PCM600 . Switch position shown for default setting (Calclated Vo) .
2. "Pol Signal Sel" parameter setting Calc Vo, and 59N-1 function not applicable for open delta connected VTs. | | | | | | | | | | SINGLE LINE DIAGRAM (TYPICAL) | | AUTOCAD 2014 | | Copyright 2015 ABBAll rights reserved | | 1MAC505278-DR | | A | | | RELAY ORDER CODE: NAFAABA3FFxxxAx1xx | | | | | | | | | | | | | ABB Protective Relays and Switches, Coral Springs Fl, U.S.A. | | | | | SHEET 1 OF 7 | | | | | | | | | | | | REF620_NAFAABA3FFxxxAx1xx | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

PHASE VOLTAGE VA
PHASE VOLTAGE VB
PHASE VOLTAGE VC
GROUND VOLTAGE VG
SYNCH VOLTAGE VS
A B C D E F G H I J
1
2 3
4 5
6 7
8 9
10 11
12 13
14 15
16 17
18 19
20
( POTENTIALS) | | | | |
| | | | | | |
| | | | | | | | | | | | | | | | | | | | 52_EXE_CL/79-1_CLOSE_CB(PO1) | | 50BF_TR BU(PO2) 86_94-1_TRIP/52_EXE_OP(PO3) 86_94-2_TRIP(PO4)
86_94-1_TRIP(HSO1)
AFD-2_TRIP(HSO2)
AFD-3_TRIP(HSO3)
CB_ POSITION_CLOSE(IN2) CB_ POSITION_OPEN(IN3) | | | EXTERNAL AR BLOCKING(IN4) | | | | | | | | PHASE CURRENT | IA
| PHASE CURRENT | IB
| PHASE CURRENT
IC
GROUND CURRENT | IG
| RELAY POS . VDC
RELAY NEG . VDC | | | | | | | | | | | | | | A B C D E F G H I J

12
34
56
78
910
1112
1314
1516
1718
1920
(CURRENTS AND POWER SUPPLY) | | | | | | | A B C D E F G H I J
12
34
56
78
910
1112
1314
1516
1718
1920
( BINARY I/O AND HIGH SPEED OUTPUTS) | | | | | | | | | | | | | General Notes:
1. Style and code numbers for FT-1 switches provide black covers and handles, screw terminals and standard depth. Poles selection follows arrangement shown in this drawing set. For custom designs, different selection options can be made by using FT-1 configurator at [ft1switch.com](ft1switch.com)
[2](2). Refer to 620 series ANSI Installation Manual for relay and cutout dimensions ( Document ID: 1MAC457436-iB, Revision: A, Product version 2.0) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | FRONT PANEL ELEVATION RELAY ORDER CODE: NAFAABA3FFxxxAx1xx | | | | | | | | AUTOCAD 2014 | | | Copyright 2015 ABBAll rights reserved | | | 1MAC505278-DR | | | A | | | | | | | | | | | ABB Protective Relays and Switches, Coral Springs Fl, U.S.A. | | | | | | | | SHEET 2 OF 7 | | | | REF620_NAFAABA3FFxxxAx1xx
52

Bus
Broken Delta
Open
Delta *
FT-1/TS3 REF620
X130
FT-1/TS1
X120

WYE VT CONNECTION
'VT connection' setting = 'Wye')

* For relay voltage connections shown set Analog input Voltage 'VT connection' setting to Wye' for metering to work correctly. Refer to application manual for alternate connections to relay for open delta connections using 'Delta' VT connection setting. | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | AC SCHEMATIC ( TYPICAL) RELAY ORDER CODE: NAFAABA3FFxxxAx1xx | AUTOCAD 2014 | | Copyright 2015 ABBAll rights reserved | | 1MAC505278-DR | | | A | | | | ABB Protective Relays and Switches, Coral Springs Fl, U.S.A. | | | | | | SHE

FAQs

What application context do the REF620 drawings target?

The functions shown are for a distribution feeder application, with specific relay and wiring elements documented across multiple schematic sheets.

How are VT connections handled for metering?

The documentation highlights Wye VT connection settings for correct metering and notes alternate considerations for open-delta connected VT configurations.

Where are phase voltages, currents, and binary I/O shown?

Phase voltages and currents are listed on the diagram sections (VA/VB/VC/VG and IA/IB/IC/IG), while binary I/O and high-speed outputs are mapped in the binary I/O sections.

Oct 25, 2026

Upload by jay