ABB REF615 Control Relay

Product Description

The ABB REF615 is a dedicated, high-capability feeder protection relay from the globally proven Relion 615 hardware family. Engineered for advanced protection, precise measurement, and continuous supervision of utility substations and demanding industrial power networks, this intelligent electronic device (IED) delivers exceptional grid stability. 

Technical Specifications

• Manufacturer: ABB

• Product Line Family: Relion 615 Series

• Model Hardware Number: REF615

• Primary Scope Functions: Dedicated Overcurrent Protection, Multi-channel Measurement, and System Supervision

• Earth-Fault Protection Variants: Configurable with directional or nondirectional earth-fault detection logic

• Bay Control Provisions: Built-in control for one circuit breaker with dedicated front-panel push-buttons for manual opening and closing

• Rated System Frequency: 50/60 Hz nominal with an operational window of plus or minus 5 Hz

• Control Input Power Tolerances: Rated voltage range of 24 to 250 V DC (Operating window of plus or minus 20 percent of rated value)

• Binary Input Current Drain: Low-draw threshold between 2 to 18 mA per channel

• Internal Power Consumption: Highly efficient resting power draw of less than 0.9 W

• Binary Input Threshold Voltage Range: Hardware configurable between 18 to 176 V DC

• Output Relay Contact Rated Voltage: 250 V AC/DC maximum

• Continuous Output Current Carry: 5 A continuous loading capacity

• Short-Term Output Current Make and Carry: Handles 8 A for up to 3.0 seconds, and up to 10 A for 0.5 seconds

• Output Contact Breaking Capacity: Supports 1 A / 0.25 A / 0.15 A depending on voltage configurations when control-circuit inductive time constant L/R is less than 40 ms

• Minimum Operational Contact Load: 100 mA minimum required signal at 24 V AC/DC

• Physical Profile Dimensions (Width): Front outer frame is 177 mm, internal case insert is 164 mm

• Physical Profile Dimensions (Height): Front outer frame is 177 mm (4U rack standard), internal case insert is 160 mm

• Physical Profile Dimensions (Depth): Main chassis case depth is 155 mm

• Net Product Hardware Weight: Fully assembled relay is 3.5 kg, plug-in internal spare unit is 1.8 kg

• Total Gross Shipping Logistics Weight: 6.0 kg (13.23 lbs) including robust, shock-insulated factory boxing

Industrial Application Scenarios

The ABB REF615 is installed within medium-voltage switchgear cubicles inside electric utility substations, renewable energy generation farms, massive chemical plants, and heavy manufacturing infrastructures. It functions as the primary line of defense for outbound radial, looped, or meshed overhead and underground distribution feeders. By continuously monitoring real-time voltage and current waveforms at 50/60 Hz, the REF615 can immediately isolate system overloads, short-circuits, phase-displacements, and dangerous earth faults. This minimizes structural grid damage and shields downstream equipment from catastrophic electrical stress.