ABB REF615K Protection Relay

Technical Overview

The ABB REF615K is a high-performance Intelligent Electronic Device (IED) from the Relion® 615 series, specifically engineered for the protection, measurement, and supervision of utility substations and industrial power systems. 

Detailed Technical Specifications

The ABB REF615K is defined by the following industrial-grade engineering parameters:

• Primary Application: Feeder protection, measurement, and system supervision.

• Operating Voltage: Universal 24 V to 250 V DC (±20% operating range).

• Rated Frequency: 50/60 Hz (±5 Hz).

• Current Drain: Efficient 2 mA to 18 mA range.

• Threshold Voltage: Configurable from 18 V to 176 V DC.

• Contact Ratings: * Rated Voltage: 250 V AC/DC.

• Continuous Carry: 5 A.

• Short-term Make/Carry: 10 A (0.5 s) / 8 A (3.0 s).

• Minimum Load: 100 mA at 24 V AC/DC.

• Breaking Capacity: 1 A / 0.25 A / 0.15 A (at L/R < 40 ms).

• Dimensions: 177 mm (4U Height) x 177 mm (Frame Width) x 155 mm (Case Depth).

• Weight: 3.5 kg (Relay unit); 1.8 kg (Spare unit).

• Lead Time: 6 – 10 Weeks.

Control and Supervisory Features

The REF615K excels in modern substation automation by integrating control logic directly into the protection module. The inclusion of dedicated control push-buttons simplifies manual breaker management, while the internal logic supports complex interlocking and auto-reclosing schemes. Its supervisory capabilities extend to monitoring the health of the trip circuit, current transformer integrity, and internal hardware/software self-diagnostics. This ensures that the protection system is always ready to act during a fault, minimizing the risk of failure-to-trip scenarios in critical power infrastructure.