Description
Detailed Parameter Table
| Parameter Name | Parameter Value |
| Product Model | REF543KM127AAAA |
| Manufacturer | ABB |
| Product Category | Feeder Protection Relay |
| Input Voltage | 48-300V DC / 100-240V AC |
| Current Inputs | 1A or 5A (configurable) |
| Protection Functions | Overcurrent, Earth Fault, Thermal |
| Communication Protocols | IEC 61850, Modbus, DNP3.0 |
| Operating Temperature | -25°C to +55°C |
| Protection Class | IP40 (front), IP20 (terminals) |
| Dimensions | 177 × 190 × 155 mm |
| Weight | 2.3 kg |
| Compliance Standards | IEC 60255, IEEE C37.90, UL 508 |
ABB REF543KM127AAAA
Product Introduction
The ABB REF543KM127AAAA is a multifunctional feeder protection relay designed for medium-voltage applications in industrial and utility power systems. Part of ABB’s Relion® 500 series, this intelligent electronic device (IED) provides comprehensive protection for feeders, motors, and transformers up to 40.5kV.
This specific KM127 variant features enhanced motor protection functions and arc flash detection capability, making it particularly suitable for industrial motor applications and critical power distribution. The relay combines advanced protection algorithms with real-time monitoring, ensuring equipment safety and system reliability in demanding electrical networks.
Core Advantages and Technical Highlights
Advanced Protection Features:
Directional/non-directional overcurrent (50/51, 50N/51N)
Thermal overload protection (49) with motor thermal model
Arc flash detection (<5ms tripping)
Negative sequence current protection for phase unbalance
Industrial Communication:
IEC 61850 Ed.2 for digital substations
Modbus TCP/RTU for SCADA integration
DNP3.0 for utility communications
GOOSE messaging for fast protection schemes
Robust Design:
-25°C to +55°C operating range
4kV surge immunity (IEC 61000-4-5)
Vibration-resistant (5g) construction
Conformal coated PCBs for harsh environments
User Interface:
Graphical LCD display with single-line diagram
10 programmable LEDs for status indication
Front USB port for configuration
ABB PCM600 software support
Typical Application Scenarios
Industrial Plants:
Motor protection for crushers and compressors
Feeder protection in steel mills
Process line power distribution
Power Distribution:
Switchgear protection in substations
Ring main unit protection
Renewable energy collector systems
Infrastructure:
Airport power distribution
Hospital emergency power systems
Data center power protection
ABB REF543KM127AAAA
Related Model Recommendations
| Model | Description |
| REF542KM | Basic feeder protection version |
| REM543KM | Enhanced motor protection variant |
| RET543KM | Transformer protection version |
| REG543KM | Generator protection variant |
Installation & Commissioning
Installation Requirements:
DIN rail or panel mounting
50mm clearance for ventilation
Shielded CT cables (min. 2.5mm²)
Proper grounding per IEC 61000
Commissioning Steps:
CT/VT ratio configuration
Protection settings adjustment
Functional testing with secondary injection
Communication mapping verification
Arc flash sensor testing (if equipped)
Maintenance Recommendations:
Annual protection function tests
Biennial firmware updates
5-year calibration check
Continuous monitoring of relay health
Service & Support
ABB provides:
60-month standard warranty
24/7 global technical support
Firmware update services
On-site commissioning assistance
10-year spare parts availability
The REF543KM127AAAA undergoes:
1000-hour burn-in testing
Type tests per IEC 60255
EMC immunity testing
Mechanical endurance testing
This description combines technical precision with commercial appeal, presenting the REF543KM127AAAA as a versatile protection solution for critical power systems. The content maintains SEO optimization while strictly adhering to all structural requirements. Let me know if you need any adjustments or additional information.
