ABB REJ603 BB401NN31E Self-Powered Feeder Protection Relay

Configured for selective short-circuit and earth-fault protection in secondary distribution networks, the ABB REJ603BB401NN31E (REJ603 Self-Powered Feeder Protection Relay) provides direct physical/electrical execution.

Hardware Specifications

Industrial Control and Drives Characteristics

The REJ603BB401NN31E hardware platform integrates with backplane bus communication velocity Licences to maintain deterministic internal timing structures. The module interfaces seamlessly across Profinet / EtherNet/IP deterministic networks via dedicated external communication links to facilitate remote data capture while maintaining localized independent fault isolation. The embedded microcontroller firmware ensures total hardware-to-firmware flash compatibility across the wider Relion 600 series platform, ensuring that local digital logic execution operates within fixed, low-latency parameters. High-density scaling allows the physical housing to support the 1 DI / 1 DO binary matrix alongside the core protection hardware without increasing the operational footprint inside compact ring main units.

Frequently Asked Questions

Q: How does the relay execute a trip sequence if there is no external auxiliary power supply connected?

A: The relay derives its operational energy directly from the main current transformer sensing loops. Once the line current reaches the minimum 2.5 VA startup power requirement, the internal power conditioning circuit energizes the microprocessor and charges a storage capacitor to drive the 1 NO trip output contact when a fault is validated.

Q: What are the hardware configuration limitations for adjusting the protection pickup thresholds?

A: Threshold parameters and inverse time delay curves must be set manually using the integrated front-panel DIP switches. This mechanical interface eliminates the need for field computer connections and enforces configuration persistence regardless of total power loss intervals.