ABB REF601 Feeder Protection and Control Relay

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1. Product Overview

ABB REF601 Feeder Protection and Control Relay is a compact feeder protection and control relay from the ABB Relion® 600 series. It is designed for protection, control, measurement, and supervision of medium-voltage distribution feeders. The relay combines multiple protection functions in a single device, offering reliable performance for cost-effective distribution automation applications.

2. Technical Specifications

• Model: REF601

• Product Type: Feeder Protection and Control Relay

• Series: Relion® 600 Series

• Rated System Frequency: 50 / 60 Hz

• Auxiliary Supply Voltage:

  • DC: 24–250 V

  • AC: 100–240 V

• Current Inputs:

  • 1 A / 5 A (phase current)

• Voltage Inputs:

  • Phase or line voltage (depending on configuration)

• Main Protection Functions:

  • Three-stage overcurrent protection (instantaneous / time-delayed)

  • Earth fault protection

  • Overload protection

  • Start and trip logic

• Measurement Functions:

  • Current

  • Voltage

  • Active and reactive power

  • Frequency

• Control Functions:

  • Circuit breaker open/close control

  • Status monitoring

• Communication Interface:

  • RS-485

• Communication Protocol:

  • Modbus® RTU

• Digital Inputs / Outputs:

  • Multiple configurable DI / DO (depending on version)

• Event and Fault Recording:

  • Event logs and fault records supported

• Mounting Method:

  • Panel mounting

• Degree of Protection:

  • Front: IP54

• Operating Temperature:

  • -25 ℃ to +70 ℃

• Standards Compliance:

  • IEC / EN standards for protection relays and power systems

3. Advantages and Features

1. Integrated Design
   Combines protection, control, measurement, and communication in one device.

2. Reliable Feeder Protection
   Comprehensive overcurrent and earth fault protection ensures system safety.

3. Compact and Space-Saving
   Panel-mounted design suitable for compact switchgear.

4. Communication Capability
   Modbus RTU communication enables easy integration into SCADA and automation systems.

5. User-Friendly Operation
   Local display and keypad allow intuitive configuration and monitoring.

6. International Standards Compliance
   Designed in accordance with IEC / EN standards for global applications.

4. Typical Applications

• Medium-voltage distribution systems

• Industrial power distribution networks

• Utility distribution grids

• Substation feeder protection

• Infrastructure and energy projects

• Commercial and industrial switchgear

5. Installation and Usage Notes

1. Verify current and voltage ratings before installation.

2. Protection settings must be configured by qualified professionals.

3. Use shielded cables for communication wiring and ensure proper grounding.

4. Perform secondary circuit checks and functional tests before commissioning.

5. Disconnect auxiliary power before maintenance or replacement.