ABB REF543KB127AAAA control relay

The ABB REF543 is a versatile protection and control relay used in medium-voltage (MV) and low-voltage (LV) power systems. The REF543KB127AAAA is a specific variant designed for feeder protection, motor protection, or general-purpose automation. Below are its key technical parameters:

General Specifications:

• Manufacturer: ABB
• Model: REF543KB127AAAA
• Type: Numerical Protection Relay (IED – Intelligent Electronic Device)
• Application: Feeder protection, motor protection, earth fault protection, and automation in power distribution.

Electrical Parameters:

Power Supply:

• Rated Voltage: 110-240V AC/DC (or 24-48V DC, depending on variant)
• Power Consumption: Typically <10W

Inputs:

• Analog Inputs (Current/Voltage):
  • Current (I): 1A or 5A (configurable)
  • Voltage (U): Up to 690V AC (via VT)
• Binary Inputs: Typically 8-12 digital inputs (24V/48V/110V DC configurable)

Outputs:

• Relay Outputs:
  • 4-8 programmable NO/NC contacts (rated 250V AC/30V DC, 5A)
• Trip/Close Commands: For circuit breakers or contactors

Protection Functions:

• Overcurrent (50/51, 50N/51N): Phase & earth fault
• Directional Overcurrent (67, 67N): For grid selectivity
• Thermal Overload (49): Motor protection
• Under/Overvoltage (27/59): Voltage protection
• Breaker Failure (50BF): Backup tripping
• Arc Protection (optional): With external sensors

Communication & Protocols:

• Standard Interfaces:
  • RS485 (Modbus RTU)
  • Ethernet (IEC 61850, Modbus TCP) (optional)
• Protocols Supported:
  • IEC 60870-5-103
  • DNP3.0 (optional)
  • Profibus DP (optional)

Mechanical & Environmental:

• Housing: Compact, IP40/IP52 protection (front panel)
• Mounting: DIN rail or panel mounting
• Operating Temperature: -25°C to +70°C
• Humidity: 5-95% (non-condensing)

Certifications & Standards:

• EMC: Complies with IEC 60255-26 (immunity)
• Safety: IEC 60255-27 (insulation)
• Industry Standards: IEC 61850, IEEE C37.90

Additional Features:

• Event Logging: Stores 1000+ events
• Disturbance Recorder: Captures waveforms for fault analysis
• LCD Display: For local settings & monitoring
• Password Protection: Secure access control

Typical Applications:

✔ Industrial power distribution (switchgear, MCCs)
✔ Motor protection (pumps, fans, conveyors)
✔ Renewable energy systems (solar/wind farms)
✔ Microgrid & substation automation

Main Brand:

ABB      Allen-Bradley      Alstom      Bently         Emerson     Foxboro

GE       MOOG       Schneider       Woodward       HIMA        Honeywell  

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•Shipping Port: Xiamen

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•Package: Original packing with cartons

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Q&A of our advantages:

Q: What is our primary advantage in product availability?
A: Our offers a wide range of industrial automation products with a high level of availability, ensuring quick delivery and minimal downtime.

Q: How does our ensure competitive pricing?
A: Our provides competitive pricing by leveraging strong supplier relationships and optimizing its supply chain.

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Precision Automation Solutions

SAUL ELECTRIC delivers high-performance PLC modules and control systems to optimize industrial operations. We help manufacturers maximize uptime, boost efficiency, and streamline production with reliable automation technology.

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ABB: Pioneering Electrification & Automation

 1. Company Profile

• ABB(Asea Brown Boveri), a Swiss-Swedish multinational headquartered in Zurich, is listed on the Zurich, Stockholm, and NYSE stock exchanges. Formed in 1988 through the merger of    ASEA (Sweden) and BBC Brown Boveri (Switzerland), it combines over a century of industrial expertise.

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1. Corporate Identity

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• HQ: Zurich, Switzerland
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Robotics Spin-off Context: $2.3B revenue segment (2024), targeting public listing to accelerate growth vs. Fanuc (#1).

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• Key Sectors:

• Energy Transition: Renewables integration, HVDC systems
• Transport: Rail electrification, port automation
• Manufacturing: Collaborative robotics (YuMi® series)