ABB 1VCR007346024 REF542 PLUS Multifunctional Protection and Switching Control Unit

1. Product Overview

The ABB REF542 PLUS (1VCR007346024) is a high-performance multifunctional protection and switching control unit used for feeder, transformer, line, and bus protection in medium-voltage power systems. Combining digital measurement and control technology, it provides overcurrent, ground fault, differential, under/overvoltage, and automatic reclosing functions, as well as remote monitoring and communication management. Widely used in transmission and distribution networks, industrial plants, and energy management systems.

2. Main Technical Specifications (Typical)

• Model: 1VCR007346024

• Product Type: Multifunctional Protection and Switching Control Unit

• Supply Voltage: AC 110–240 V / DC 110–250 V

• Current Measurement Range: 0.5–5 A or 1–5 A CT input

• Voltage Measurement Range: 57.7–400 V / 100–690 V optional

• Protection Functions:

  • Overcurrent protection (50/51)

  • Instantaneous overcurrent (50N/51N)

  • Ground fault protection (50G/51G)

  • Differential protection (87T/87L)

  • Under/overvoltage protection (27/59)

  • Automatic reclosing (configurable)

• Communication Interfaces: IEC 61850, Modbus RTU, DNP3

• Digital Inputs/Outputs: Multiple DI/DO

• Analog Inputs/Outputs: Multiple AI/AO

• Mounting: Panel or DIN rail

• Ambient Temperature: -25 ℃ to +70 ℃

• Protection Class: IP54 (front panel)

3. Advantages and Features

• Integrated Multifunction Protection
  Combines feeder, transformer, line, and bus protection, reducing equipment footprint.

• Digital and Communicative
  Supports IEC 61850, Modbus, and other protocols for remote monitoring and smart control.

• Automatic Reclosing and Event Logging
  Enhances power reliability and logs fault events.

• High-Precision Measurement and Fast Response
  Advanced digital algorithms provide precise current, voltage, and power measurement with quick fault detection.

• Industrial-Grade Reliability
  Resistant to electromagnetic interference and suitable for complex industrial environments.

4. Applications

• Medium-voltage distribution feeder and transformer protection

• Industrial plant power systems

• Transmission and distribution automation

• Renewable energy grid protection (wind, solar)

• Substation monitoring and automation

• Water treatment, power, petrochemical, and large industrial power systems

5. Precautions for Installation and Use

• Verify supply voltage and protection unit compatibility with the system before installation

• Ensure wiring terminals are secure to avoid poor contact

• Install in dry, ventilated environments, avoiding high humidity or dust

• Configure protection parameters and automatic reclosing according to network structure

• Commissioning and maintenance should be performed by qualified personnel

• Periodically check unit status, communication, and measurement accuracy

The structure and details of the product：

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