Product Overview

The ABB REJ603 (Part Number: 1VYV91248286) stands as a specialized numerical relay within the Relion® 605 series, engineered specifically for secondary distribution switchgear and Ring Main Units (RMUs). This device utilizes a unique self-powered design, drawing operational energy directly from the feeder current transformers. By eliminating the dependency on external auxiliary power supplies, the REJ603 ensures reliable protection in remote or unmanned locations where battery maintenance is impractical. We offer this unit as 100% Brand New and Original for critical infrastructure deployment.

Technical Specifications

Engineering Advantages

• Zero-Maintenance Power Architecture: The REJ603 powers its internal electronics using the primary current through the CTs. This design removes the "single point of failure" associated with auxiliary battery banks and chargers, significantly reducing operational expenditure in rural or isolated grids.

• Rapid Fault Signaling: Even in total darkness or power loss, the mechanical flag indicator provides a permanent visual record of a trip. This hardware-based signal assists field crews in identifying faulted sections immediately without needing to power up the relay's HMI.

• Space-Efficient Integration: The compact housing fits perfectly into narrow RMU compartments. Its standardized mounting footprint allows for quick installation in both new panel builds and retrofitting projects where space is at a premium.

• Deterministic Protection Performance: The unit employs two-stage non-directional overcurrent and earth-fault protection. These stages allow for precise grading with upstream and downstream devices, ensuring that only the faulted segment is isolated while maintaining power to the rest of the network.

• Self-Supervision Intelligence: An internal watchdog continuously monitors the hardware and software integrity. If the relay detects an internal failure, it triggers an alarm, preventing "silent failures" that could leave a feeder unprotected.

FAQs

Does the ABB REJ603 require a minimum current to start up?

Yes. Since the unit is self-powered, it requires a minimum threshold current from the phase CTs to energize the electronics. However, the relay reaches operational readiness at very low load levels, ensuring protection is active long before a fault occurs.

Can I use the REJ603 with standard 1A or 5A Current Transformers?

The REJ603 supports both 1 A and 5 A secondary ratings. You must select the correct version or configure the inputs to match your specific CT ratios to ensure accurate measurement and trip timing.

How do I retrieve fault data if the feeder is de-energized?

The mechanical trip flag stays in the "tripped" position even after power is lost. For digital event logs, some versions support a temporary power interface or internal capacitor storage that allows engineers to extract data via the HMI or communication port after the event.

Is this unit compatible with IEC 61850?

The standard self-powered REJ603 focuses on autonomous protection. While higher-tier Relion models offer full IEC 61850 stacks, the REJ603 typically provides simplified signaling or optional HMI interfaces depending on the specific hardware variant (1VYV series).