ABB REF543KM129AAAB feeder protection relay

ABB REF543KM129AAAB

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

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