Description
Key Technical Specifications
- Product Type: Feeder protection and control intelligent electronic device (IED)
- Application: MV distribution networks, feeder bays, motors, capacitor banks
- Protection Functions: Overcurrent, earth fault, directional protection, undervoltage, thermal overload, breaker failure
- Control Functions: Breaker open/close control, interlocking logic, local/remote operation sequences
- Automation Capability: Integrated PLC-style logic for substation automation sequences
- CT Inputs: 1 A / 5 A secondary inputs (configuration dependent)
- VT Inputs: 100 V / 110 V nominal (variant dependent)
- Binary Inputs/Outputs: Project-specific I/O mapping via modular hardware architecture
- Measurement Functions: Current, voltage, frequency, power, energy metering
- Communication Protocols: SPA, LON, IEC 60870-5-103, Modbus, DNP3, IEC 61850 (option/gateway dependent)
- Event Recording: Sequence-of-events (SOE) + disturbance/fault recording
- HMI Interface: Local LCD display with keypad navigation
- Mounting: Panel-mounted switchgear cubicle installation
- Operating Temperature: −25°C to +70°C typical industrial envelope
- Weight: ~7.7 kg class assembly (platform dependent)
Product Introduction
ABB REF543KM127BAAA009 is a medium-voltage feeder protection and bay control relay from the REF54x platform used in distribution substations and industrial switchgear systems. The unit integrates protection, measurement, control, and communication functions into a single feeder terminal architecture.
ABB REF543KM127BAAA009 is typically deployed in feeder bays, motor feeders, and capacitor bank protection schemes. The full ordering string indicates a project-specific configuration, meaning firmware revision, I/O layout, and communication capabilities must always be verified against the original engineering documentation. Field failures are most often linked to configuration mismatch rather than hardware defects.
