Description
Product Description: REF543KB127BAAA
Technical Specifications
- Product Model: REF543KB127BAAA
- Brand: ABB
- Warranty: One Year
- Input Voltage: 127 VDC auxiliary control supply
- Operating Temperature: -25°C ~ +55°C
- Storage Temperature: -40°C ~ +70°C
- Response Time: ≤40 ms instantaneous fault tripping
- Protection Class: IP52 front panel, IP20 rear terminal area
- Accuracy Class: ±2.5% measurement accuracy (fundamental frequency)
- Output Frequency: 50 Hz / 60 Hz system compatible
- Rated Current Range: 1 A / 5 A CT secondary input
- Communication Interface: SPA bus, RS485 serial interface; optional Ethernet expansion
- Supported Protocols: SPA, LON, IEC 60870-5-103, Modbus RTU, DNP3.0
- Overload Capacity: Built-in surge, ESD and transient voltage protection conforming to IEC 61000
- Dimensions: 177 mm × 158 mm × 147 mm
Product Overview
The ABB REF543KB127BAAA is a multifunctional numerical feeder terminal belonging to the ABB REF 54x protection series, designed for medium voltage switchgear protection, control, measurement and supervision. This integrated relay consolidates overcurrent, earth fault, thermal overload and directional protection functions alongside programmable logic to manage medium voltage feeders, asynchronous motors and capacitor banks. It eliminates the need for multiple discrete protection devices, reducing cabinet space and simplifying substation automation architecture. Protection engineers, substation operators and system integrators rely on this unit’s built-in disturbance recorder, sequence-of-event logging and flexible setting groups for fast fault diagnosis. The device supports local control via front-panel HMI and remote operation linked to SCADA systems, and complies with international IEC 60255 standards for power system protection equipment.
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