The ABB REJ601 is an IDMT (Inverse Definite Minimum Time) Overcurrent Relay designed for protection and control in 11kV Vacuum Circuit Breaker (VCB) panels. It provides reliable fault detection by measuring current inputs and tripping the breaker during overcurrent conditions with an inverse time characteristic, ensuring coordination with other protection devices.

This relay accepts current transformer (CT) inputs rated at 5A or 1A, making it versatile for various panel configurations. It is widely used in medium voltage power distribution systems to protect feeders, transformers, and busbars from overloads and short circuits.

✅ KEY FEATURES

• ⚡ Relay Type: IDMT (Inverse Definite Minimum Time) Overcurrent Relay

• ? Current Rating: Compatible with CT secondary currents of 5A or 1A

• ⚙️ Function: Detects overcurrent faults and provides timed trip signals to the VCB for breaker operation

• ⏱️ Inverse Time Characteristic: Trip time decreases as fault current increases, improving selectivity and coordination

• ?️ Settings: Adjustable pick-up current and time dial settings for flexible protection schemes

• ? Reset: Automatic or manual reset options after fault clearance

• ? Installation: Designed for integration into ABB 11kV VCB panels, compact and reliable

• ? Standards Compliance: IEC 60255 for protection relays

• ? Applications: Protection of feeders, transformers, and busbars in medium voltage power distribution networks