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, undervoltage, thermal overload, breaker failure, auto-reclose
- Control Functions: Breaker open/close control, interlocking logic, local/remote operation sequences
- Automation Capability: Integrated programmable logic (PLC-style substation 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
- Measurement Functions: Current, voltage, frequency, power, energy metering
- Communication Protocols: SPA, LON, Modbus, DNP3, IEC 60870-5-103, IEC 61850 (option-dependent)
- Event Recording: Sequence of events (SOE) + fault/disturbance recording
- HMI Interface: Local LCD display with keypad navigation
- Mounting: Panel-mounted switchgear cubicle installation
- Operating Environment: Indoor MV substations, industrial distribution panels
- Weight: ~7.7 kg class hardware assembly
Product Introduction
ABB REF543KM127AAAA is a medium-voltage feeder protection and bay control relay used in distribution substations and industrial switchgear systems. The unit belongs to the REF54x platform, which combines protection, control, measurement, and communication functions in a single feeder terminal architecture.
ABB REF543KM127AAAA is typically deployed in feeder bays, motor feeders, and capacitor bank protection applications. The configuration code reflects a project-specific build, meaning I/O mapping, communication options, and firmware behavior must always be verified against original engineering documentation. In field work, most failures come from configuration mismatch rather than hardware defects.
