ABB REF543KM129AAAB feeder protection relay

The ABB REF543 is a feeder protection relay from the REF 54x series, designed for medium-voltage distribution networks. Below are the key technical parameters for the REF543KM129AAAB variant:

General Specifications:

Model: REF543 (KM129AAAB denotes specific hardware/software configuration)
Application: Feeder protection, motor protection, and transformer protection
Housing: Standard 19-inch rack or panel mounting (IP40/IP52)

Electrical Parameters:

Rated Voltage (Auxiliary Supply):
- DC: 24–250 V
- AC: 48–250 V
Current Inputs:
- Rated Current (Iₙ): 1 A or 5 A (configurable)
- Thermal Withstand: 4× Iₙ continuously, 100× Iₙ for 1s
Frequency: 50/60 Hz

Protection Functions:

Overcurrent Protection (50/51, 50N/51N, 50G/51G)
Directional Overcurrent (67, 67N)
Earth Fault Protection (50EF/51EF, 67N)
Thermal Overload Protection (49)
Motor Protection (46, 49, 66) (if applicable)
Autoreclosing (79) (optional)

Communication & I/O:

Communication Protocols:
- IEC 61850, Modbus RTU/TCP, DNP3, IEC 60870-5-103
Binary Inputs: Up to 14 (programmable)
Binary Outputs: Up to 10 (relay contacts)
Ethernet Ports: 2× (for IEC 61850 & SCADA)

Environmental & Mechanical:

Operating Temperature: -25°C to +60°C
Ingress Protection: IP40 (standard), IP52 (optional)
Mounting: 19-inch rack or panel

Main Brand:

ABB Allen-Bradley Alstom Bently Emerson Foxboro

GE MOOG Schneider Woodward HIMA Honeywell

Annual hot selling advantage products：

ABB PM861AK02 ABB PP846A ABB PM864AK01

ABB PM861A ABB PM861AK01 ABB PM864A

First hand source, affordable price. Spot inventory!

•Shipping Port: Xiamen

•Ship to you via Fedex/DHL/TNT/UPS/EMS

•Package: Original packing with cartons

3BHE023784 5SHY3545L0014	UFC911B106 3BHE037864R0106
UFC921A101 3BHE024855R0101	UFC789 3BHE014022P102
XVC770BE101 3BHE021083R0101	KUC755AE105 3BHB005243R0105
S-073N 3BHB009884R0021	ACS6000 3BHB011219R0001

【Our Main Brand】

ABB, GE, Allen Bradley, Honeywell, Emerson, Bently Nevada, Prosoft, Siemens, Westinghouse, Triconex, Foxboro, ICS Triplex, Hima, Schneider, Yokogawa, Woodward, B&R, KEBA, etc

—-(DCS)Distributed Control System

ABB 3AUA0000110429,SYSCON2 746924

Invensys Foxboro FBM214,FBM242,B0123HE

Invensys Triconex 3625,3700A,3604E

Woodword 5462-758B

HIMA F2-DO-16-02,F8650E

Yokogawa SAI143-S03 S1, F9342L-02

Honeywell 51402497-200,51403519-160,51199194-100,CC-PDO801

Emerson KJ4001X1-NB1,12P3368X012

—-(PLC)Programmable Logic Controller

Rockwell AB 1734-IB8,1734-OB8,1769-L18ER-BB1B,1756-IM16I

ICS Triplex T8461,T8850,T8403,T8431,T8831,T8310

Schneider Modicon 140DDI85300

GE Fnauc IS210AEPSG2B,IS220UCSAH1A,IS215ACLEH1A,IS210AEAAH1B

Siemen 6ES7331-1KF02-0AB0

Prosoft MVI46-DFNT

Bachmann MPC240

Woodhead 9905-068 2301A

—-(TSI)Turbine Supervisory Instrumentation

Bently Nevada 3500/22M,138607-01,3500/25,3500/53,3500/32M 149986-02,

EPRO MMS6110,MMS6120,MMS6220,MMS6312,MMS6410,6423,6424,

ENTEK EK C6622HS,XM124,1440-SDM02-01RA

FAQ

Q:What is the earliest time when you can make delivery?

A:We will make delivery once received your payment.

Q:If the product can’t work, can it be returned?

A:We provide one year warranty.

Q:How easy is it to obtain items?

A:New are no longer continuously manufactured, and therefore supply is scarce.

However, at SAUL we specialize in sourcing hard-to-find products, and although

the lead time varies, the average is between 5-7 business days.

Q:What is the typical price for the items?
A:SAUL ELECTRIC always gives customers excellent service and prices that

are highly competitive.Requirements for delivery and availability do affect pricing.

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ABB REF543KM129AAAB feeder protection relay