The ABB 3ASC25H203  is a protection relay from the RED 615 series, designed for feeder and overhead line protection in distribution networks. Below are its key technical parameters:

General Specifications:

• Product Series: RED 615 (part of the Relion® 615 series)
• Protection Functions: Overcurrent, earth-fault, directional protection, etc.
• Communication Protocols: IEC 61850, Modbus, DNP3, IEC 60870-5-103
• Housing: HBUAEAADANB6ANN1XG (specific mechanical coding for mounting and accessories)

Electrical Parameters:

• Rated Voltage:
  • Auxiliary Supply: 24–250 V DC / 48–250 V AC
• Current Inputs:
  • Rated Current (Iₙ): 1 A or 5 A (configurable)
  • Thermal Withstand: 4× Iₙ continuously, 100× Iₙ for 1s
• Frequency: 50/60 Hz

Protection Functions:

• Overcurrent Protection (50/51, 50N/51N)
• Directional Overcurrent (67, 67N)
• Earth Fault Protection (50G/51G, 67N)
• Arc Protection (optional)
• Autoreclosing (79)

Communication & I/O:

• Ethernet Ports: 2× for IEC 61850 & SCADA
• Binary Inputs: Up to 14 (programmable)
• Binary Outputs: Up to 10 (relay contacts)

Environmental & Mechanical:

• Operating Temperature: -25°C to +55°C
• Ingress Protection: IP20 (panel-mounted)
• Mounting: 19-inch rack or panel