ABB REF541KM115AAA | REF541 Distribution Automation Protection Relay with CT Inputs

ABB REF541KM115AAA | REF541 Distribution Automation Protection Relay with CT Inputs

  • Model: REF541KM115AAA
  • Brand: ABB
  • Series: REF 541 Feeder Terminal / REF 54 Series
  • Core Function: Provides feeder protection, measurement, control, monitoring, and communication functions for medium-voltage distribution networks.
  • Product Type: Feeder Protection Relay / Intelligent Electronic Device (IED)
  • Key Specs:
    • Auxiliary supply: 110–240 VAC/DC
    • Current inputs: 1 A / 5 A CT interface
    • Integrated protection, control, and communication functions
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Category: SKU: ABB REF541KM115AAA

Description

Key Technical Specifications

Parameter Value
Manufacturer ABB
Model REF541KM115AAA
Product Type Feeder Terminal Protection Relay
Product Family REF 541
Application Medium-voltage feeder protection and control
Auxiliary Supply Voltage 110–240 VAC/DC
Frequency 50/60 Hz
Current Inputs 4 × CT inputs, 1 A / 5 A
Voltage Inputs Voltage transformer measurement inputs
Binary Inputs 15 digital inputs
Output Relays Multiple configurable trip and signal outputs
Protection Functions Overcurrent, earth fault, voltage protection, thermal overload, breaker failure functions
Measurement Functions Current, voltage, power, energy, frequency, power factor
Communication Interfaces SPA Bus, LON Bus, IEC 60870-5-103, Modbus/DNP options depending on configuration
Disturbance Recorder Up to 16 analog channels and 16 logic signals
Mounting Panel/cubicle installation
Engineering Tool ABB Relay Configuration Tool

 

Product Introduction

 

ABB REF541KM115AAA Overview

The ABB REF541KM115AAA is a REF 541 feeder terminal relay designed for medium-voltage distribution protection, control, measurement, and supervision applications. It integrates protection functions, programmable logic, measurement features, disturbance recording, and communication capabilities into a single substation automation device.

The ABB REF541KM115AAA is maintained in many legacy MV switchgear installations where operators need to keep existing protection schemes operational. Its 110–240 VAC/DC auxiliary supply version and CT-based measurement inputs make it suitable for feeder protection applications, but replacement requires checking hardware suffix details, protection settings, and communication configuration before commissioning.

REF545KB133AAAA

Application Scenarios & Field Pitfalls (The Engineer’s Perspective)

 

Engineering Pain Point

A feeder trip event in a substation often creates pressure to restore service quickly. The relay may be blamed first, but the actual issue can come from CT wiring, incorrect protection settings, failed auxiliary power modules, or communication configuration changes after maintenance work. The ABB REF541KM115AAA sits at the center of these functions, so replacing it requires more than swapping hardware.

This relay belongs to a legacy protection platform. Documentation matters. Record everything before removal.

 

Typical Applications

  • Industrial Substations – Medium-voltage feeder protection for manufacturing plants and process facilities.
  • Power Distribution Networks – Protection and control of MV feeders, switchgear sections, and outgoing lines.
  • Oil & Gas Facilities – Motor feeders, auxiliary power distribution, and critical electrical loads.
  • Power Generation Plants – Generator auxiliary systems and plant distribution feeders.

 

Technical Pitfalls to Avoid

  1. Exact Hardware Code Verification

    REF541 units have multiple hardware configurations. The complete ordering code determines CT inputs, voltage measurement options, I/O configuration, and supply range. Confirm the suffix before replacement.

  2. Protection Setting Recovery

    A replacement relay does not automatically contain the original protection parameters. Backup the relay configuration, logic equations, communication settings, and event records before removing the old unit.

  3. CT Circuit Handling

    Current transformer circuits require proper isolation procedures. Incorrect CT handling during replacement can create safety risks and damage measurement inputs.

Field note: Before changing an REF541 relay, save the configuration file, photograph terminal wiring, record firmware information, and document communication addresses. Those records reduce commissioning time significantly.

 

Related Products

  • ABB REF543
    A higher-function REF 54 series feeder terminal with expanded I/O and application capability. Used when additional protection, control, or automation functions are required.
  • ABB REF545
    Advanced REF 54 series feeder terminal designed for more complex feeder and distribution automation applications.
  • ABB REF541KM115AAAA
    Closely related REF541 configuration with similar feeder protection functionality. Differences are based on hardware options and ordering code configuration.
  • ABB REF541K Series
    Complete REF541 hardware family covering different auxiliary voltage ranges, input configurations, and I/O arrangements.
  • ABB RET54 Series
    Related protection terminal family used for transformer protection applications rather than feeder protection.
  • ABB REM54 Series
    Motor protection terminal family within the same REF54 generation. Used for medium-voltage motor protection schemes.
  • ABB SPA-ZC Communication Adapters
    Communication accessories used to integrate REF54 relays with IEC 61850, Profibus, or other supervisory systems depending on configuration.
  • ABB PCM600 Engineering Platform
    Engineering environment used with newer ABB protection relays. REF541 systems generally use earlier ABB relay configuration tools, so migration projects require compatibility review.
  • ABB REF 500 Legacy Protection Family
    Related ABB feeder, motor, and transformer protection products used in older substation automation installations.

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