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ABB REF543KM129AAAB

Product Overview

Model: ABB REF543KM129AAAB
Series: REF 543 Feeder Terminal
Manufacturer: ABB

The REF543KM129AAAB is a numerical feeder protection and control relay designed for medium-voltage distribution networks. It integrates protection, control, measurement, monitoring and substation automation functions into one device.

It belongs to the ABB Substation Automation System and is widely used in utility substations, industrial power systems, and switchgear panels.

Main Functions

The REF543 family is built to protect, control, measure and supervise MV feeders in one compact unit.

Protection Functions

Typical protection capabilities include:

• Non-directional & directional overcurrent protection
• Earth-fault protection
• Over/under-voltage protection
• Thermal overload protection
• Frequency protection
• Breaker failure protection (CBFP)
• Auto-reclosing
• Capacitor bank & motor protection

These functions allow the relay to protect feeders, motors and capacitor banks in multiple network grounding types.

Measurement & Monitoring

The terminal continuously measures key electrical parameters:

• Phase currents & voltages
• Residual current/voltage
• Frequency & power factor
• Active/reactive power and energy
• Harmonics measurement
• Circuit breaker condition monitoring
• Trip circuit supervision
• Internal self-diagnostics

This makes it a complete feeder monitoring solution, not just a protection relay.

Automation & Communication

A key strength of the REF543 series is built-in automation:

• Integrated PLC logic functions
• Substation automation integration
• Local PC communication interface
• Remote communication to SCADA/substation systems

These features enable automation sequences and remote monitoring without extra controllers.

Typical Applications

REF543KM129AAAB is typically used in:

• Medium-voltage switchgear (single or double busbar)
• Utility distribution substations
• Industrial plants and factories
• Motor feeder protection
• Capacitor bank control and protection

It supports isolated, resonant-earthed and partially earthed networks.

Key Advantages

• All-in-one protection + control + automation
• High reliability for critical power systems
• Flexible for many switchgear configurations
• Integrated PLC and communication
• Suitable for modern substation automation