ABB REJ603 REJ603BB401NN3XE Protection Relay

Product Overview

The ABB REJ603BB401NN3XE is a specialized member of the REJ603 family, designed to act as a robust sentinel for power feeders. Its defining characteristic is its ability to operate independently of any auxiliary power supply, deriving the necessary energy directly from the current transformers (CTs). 

Technical Specifications

• Manufacturer: ABB

• Model: REJ603BB401NN3XE

• Product Type: Feeder Protection (Overcurrent and Earth Fault)

• Power Supply: Self-powered via CT inputs (No batteries required)

• Protection Logic: Short-circuit detection and Earth-fault isolation

• Selectivity: Advanced algorithms to differentiate between local and upstream faults

• Condition: Brand New with Original Factory Packaging

• Warranty: 12 Months

• Country of Origin: Germany

Key Features & Engineering Advantages

• Self-Powered Sentinel: By drawing energy from the primary current transformers, this relay simplifies installation and eliminates the failure points associated with external power supplies or batteries.

• Short-Circuit Slayer: Engineered to detect and isolate overcurrents and earth faults with extreme speed, the relay minimizes equipment damage and reduces system downtime.

• Earth Fault Champion: It features specialized algorithms designed to target earth faults with high precision, ensuring reliable tripping even in electrically noisy industrial environments.

• Selective Shielding: The REJ603BB401NN3XE is designed for selective coordination, ensuring it only clears faults within its specific feeder zone to prevent unnecessary wide-scale outages.

• Rugged Defender: This unit is built to withstand extreme temperatures, mechanical vibrations, and shocks, making it a dependable choice for the most challenging field locations.