Description
Detailed Parameter Table
| Parameter Name | Parameter Value |
| Product Model | REF541KM118AAAA |
| 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 | 2.2 kg |
| Compliance Standards | IEC 60255, IEEE C37.90, UL 508 |
ABB REF541KM118AAAA
Product Introduction
The ABB REF541KM118AAAA is a compact feeder protection relay from ABB’s Relion® 500 series, designed for medium-voltage applications in industrial and utility power systems. This KM118 variant provides comprehensive protection for feeders, motors, and transformers up to 40.5kV, combining advanced protection functions with real-time monitoring capabilities.
Engineered for rugged industrial environments, the relay features enhanced motor protection algorithms and flexible communication options, making it particularly suitable for industrial plants and commercial power distribution. Its compact design and intuitive interface simplify installation and operation while maintaining high reliability in demanding electrical networks.
Core Advantages and Technical Highlights
Protection Features:
Directional/non-directional overcurrent (50/51, 50N/51N)
Thermal overload protection (49) with motor thermal model
Negative sequence protection for phase unbalance
Inrush current blocking for transformer applications
Communication Capabilities:
IEC 61850 Ed.2 for digital substations
Modbus TCP/RTU for SCADA integration
DNP3.0 for utility communications
Front USB port for local configuration
Industrial 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
ABB PCM600 software support
One-button test functionality
Typical Application Scenarios
Industrial Facilities:
Motor protection for pumps and compressors
Process line feeder protection
Switchgear protection in manufacturing plants
Power Distribution:
Ring main unit protection
Secondary substation feeders
Renewable energy collector systems
Infrastructure:
Airport power distribution
Hospital emergency power systems
Commercial building main feeders
ABB REF541KM118AAAA
Related Model Recommendations
| Model | Description |
| REF542KM | Enhanced feeder protection version |
| REM543KM | Motor protection specialist |
| RET543KM | Transformer protection variant |
| REU615 | Line differential protection for transmission |
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
Alarm and LED configuration
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 REF541KM118AAAA undergoes:
1000-hour burn-in testing
Type tests per IEC 60255
EMC immunity testing
Mechanical endurance testing
This description presents the REF541KM118AAAA as a versatile protection solution for industrial and utility applications, combining technical accuracy with commercial appeal. The content maintains SEO optimization while adhering to all structural requirements. Let me know if you need any adjustments or additional information.
