The ABB REJ603BBB10NN3XC is a self-powered, numerical feeder protection relay designed to enhance the reliability and safety of secondary distribution networks in utility and industrial environments. Leveraging advanced digital signal processing (DSP), this intelligent relay offers superior accuracy and faster response times compared to traditional electromechanical protection devices.

Part of ABB’s trusted line of REJ relays, the REJ603BBB10NN3XC provides comprehensive protection functions including overcurrent, earth fault, and phase fault protection. Its self-powered operation eliminates the need for an auxiliary power supply, making it ideal for retrofit projects and installations with limited power access.

With a compact design, robust performance, and minimal maintenance requirements, this feeder protection relay is a dependable choice for critical power systems.

🔧 Key Features:

• Model: REJ603BBB10NN3XC

• Type: Self-powered numerical feeder protection relay

• Technology: Digital signal processing (DSP)

• Protection Functions: Overcurrent, earth fault, and phase fault protection

• Applications: Secondary distribution networks in utilities and industries

• Design: Compact and easy-to-install form factor

• Operation: Energy harvesting from current transformers (CTs) – no external power needed

💡 Benefits:

• Increased Accuracy & Reliability – Digital processing ensures consistent performance

• Self-Powered Design – Operates without external auxiliary power

• Cost-Effective – Reduces cabling and installation complexity

• Fast Fault Detection – Rapid response minimizes equipment damage and downtime

• Ideal for Retrofits – Simple upgrade path for outdated electromechanical relays

🏭 Applications:

• Medium and low-voltage secondary distribution networks

• Power utilities and substations

• Industrial electrical panels and switchgear

• Remote and off-grid power systems