ABB REF601 Feeder Protection And Control Relay

Overview

The ABB REF601 is a compact, smart, and economical feeder protection and control relay. ABB designed it specifically for medium-voltage applications in primary and secondary distribution networks. As part of the Relion® 605 series, it delivers reliable protection, control, measurement, and supervision in one integrated unit.

Technical Specifications

Measurement

• Phase current inputs: 1A / 5A CT or sensor-based (Rogowski)

• Earth fault current: Internal or via CBCT

• Frequency: Selectable 50 Hz or 60 Hz

• Rated current input: 1A or 5A

• Accuracy: IEC 60255-compliant for protection and measurement

Inputs / Outputs

• 4 binary inputs (customizable logic functions)

• 4 binary outputs (trip/alarm/communication signaling)

• 3-phase current input channels

Communication

• Protocols: Modbus RTU, IEC 60870-5-103, optional IEC 61850

• Ports:

• RS-485

• Optical port

• Optional Ethernet

• Sequence of events (SOE): Logs time-stamped events for analysis

User Interface

• Local HMI: With LEDs and pushbuttons

• Indications: Faults, status, and breaker position

• Navigation: Pushbutton-based intuitive local operation

Power Supply

• Range: 24–250 VDC or 100–240 VAC

• Frequency: 50/60 Hz compatible

Environmental Specifications

• Operating temperature: −40°C to +70°C

• Storage temperature: −40°C to +85°C

• Humidity: 5%–95%, non-condensing

• Protection class: IP for front and rear (dependent on mounting)

Mechanical / Mounting

• Mounting types: Flush or surface

• Compact housing: Designed for easy panel or switchgear integration

• Weight: Lightweight for simplified installation

Standards & Compliance

• Electrical compliance: IEC 60255, IEC 61000

• Communication standard: Optional IEC 61850

• EMC & safety: Meets international norms for utility-grade protection