ABB REF541KB115AAAA Integrated Medium Voltage Feeder Protection

Product Description

REF541KB115AAAA belongs to ABB classic REF541 series numerical feeder terminal, dedicated for 6–35kV medium voltage power distribution network.

It integrates fault protection, circuit breaker control, electrical parameter measurement, fault recording and multi-channel signal monitoring all in one unit. Equipped with front 

LCD man-machine interface, rich digital input/output terminals, supports mainstream power communication protocols, PCB with anti-condensation conformal coating, embedded panel 

mounting inside switchgear cabinet. Widely used as replacement spare for power plant auxiliary power, industrial substation, mining and factory medium voltage distribution cabinet protection systems.

Technical Specifications

Model: REF541KB115AAAA, Brand: ABB, Origin: Switzerland

Application: MV feeder, motor, transformer, capacitor bank comprehensive protection & monitoring

CT Rated Input: 1A / 5A selectable current transformer input

VT Rated Input: 100V voltage transformer signal input

Auxiliary Power Supply: 110~240V AC/DC wide range dual power input

Max Power Consumption: 15W

Digital Input: 15 channels isolated DI

Relay Output: Up to 13 groups DO trip & signal contacts

Communication Interfaces: RS485 serial port, optional Ethernet module

Supported Protocols: IEC61850 Ed2, Modbus RTU/TCP, DNP3.0, IEC60870-5-103, Profibus DP

Built-in Functions: Fault wave recording, event log, auto-reclosing, harmonic measurement

Front Protection Grade: IP54; Rear Terminal Side: IP20

Operating Temperature: -20℃ ~ +60℃ full load

Storage Temperature: -40℃ ~ +70℃

Humidity: 5%–95% non-condensing, conformal coated PCB

Mounting: Cabinet flush panel embedded installation

Overall Dimension: 144 × 144 × 175 mm

Net Weight: Approx. 2.1kg

Certifications: CE, IEC standard power relay certification, EMC industrial anti-interference compliance

Key Features

Comprehensive multi-stage protection logic: overload overcurrent, short-circuit instantaneous trip, directional/non-directional earth fault, under/over voltage, frequency abnormal protection.

Large-capacity fault recording storage, saves hundreds of fault waveforms and event records for post-fault analysis and troubleshooting.

Built-in automatic reclosing control function, reduces power outage duration after transient line faults occur.

Full electrical parameter measurement: three-phase voltage, current, active/reactive power, power factor, electric energy and harmonic content real-time monitoring.

Multiple industrial communication protocols seamlessly dock with substation SCADA monitoring system for remote parameter setting and data uploading.

Front LCD display + physical operation keys, on-site convenient parameter calibration, fault checking and protection curve adjustment without upper computer.

IP54 front panel dustproof and splash-proof design, adapts to humid, dusty substation and workshop switchgear environments.

Reinforced anti-vibration hardware layout, stable 24/7 long-term continuous operation for industrial power distribution systems.