Description
Key Technical Specifications
- Product Type: Feeder terminal / protection and control IED
- Application: Medium-voltage distribution networks (feeders, motors, capacitor banks)
- Protection Functions: Non-directional and directional overcurrent, earth fault, undervoltage, thermal overload
- Control Functions: Breaker open/close control, interlocking, local/remote switching logic
- Automation Capability: Integrated PLC logic for substation automation sequences
- Binary Inputs: Typically ~20–25 configurable inputs (variant dependent)
- Relay Outputs: Typically ~18 outputs depending on configuration
- CT Inputs: 1 A / 5 A secondary inputs (configurable)
- VT Inputs: 100 V / 110 V nominal
- Frequency: 50 / 60 Hz
- Communication Interfaces: SPA bus, LON bus, Profibus DP, IEC 61850 (via gateway options)
- Measurement Functions: Current, voltage, power factor, active/reactive power, energy
- Installation Type: Panel-mounted MV switchgear bay unit
- Operating Environment: Industrial substation environments, isolated or earthed neutral networks
Product Introduction
ABB REF543 1MRS050496 is a medium-voltage feeder protection and bay control relay used in distribution substations and industrial switchgear systems. It belongs to ABB’s REF54x platform, designed to combine protection, measurement, control, and communication in a single feeder terminal architecture.
ABB REF543 1MRS050496 is typically deployed in feeder bays, motor feeders, and capacitor bank protection schemes. The platform supports programmable logic functions, allowing interlocking and automation sequences to run locally without external PLC dependency. In real installations, performance depends more on CT/VT wiring integrity and logic configuration discipline than on the relay hardware itself.
