Introduction
The ABB REJ603 REJ603BBB10NN3XC Self Powered Feeder Protection Relay is a compact and highly reliable protection solution designed for secondary distribution networks where auxiliary power may not be available. As part of ABB’s Relion® protection family, it is engineered to ensure stable feeder and grounding fault protection in Ring Main Units (RMU), substations, and industrial power distribution systems.
Unlike conventional relays, this model operates entirely through current transformer (CT) energy harvesting, making it especially valuable for remote or unmanned installations where long-term operational stability is essential. Its design reflects ABB’s focus on simplicity, safety, and lifecycle efficiency in modern electrical grids.
Technical Specifications
The REJ603 REJ603BBB10NN3XC combines compact engineering with dependable electrical protection performance for medium-voltage applications.
| Parameter | Specification |
|---|
| Model | REJ603BBB10NN3XC |
| Product Type | Self-powered feeder protection relay |
| Power Supply | CT-powered (no external auxiliary supply required) |
| Frequency | 50/60 Hz |
| Protection Functions | Overcurrent (3-phase), Earth-fault protection |
| Application Scope | Secondary distribution networks, RMU, substations |
| Mounting Type | Panel / switchgear mounted |
| Operating Principle | Non-directional protection |
| Communication | Variant-dependent (optional configurations) |
Applications
The ABB REJ603 REJ603BBB10NN3XC is widely deployed across utility and industrial environments where dependable feeder protection is required.
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Ring Main Units (RMU) in medium-voltage networks
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Secondary distribution substations
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Industrial feeder protection systems
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Remote or unmanned electrical installations
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Transformer and cable protection circuits
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Utility distribution automation systems
Its self-powered architecture makes it particularly suitable for infrastructure where external power supply cannot be guaranteed.
Advantages
This relay is designed to deliver operational reliability with minimal complexity, making it a strong choice for modern distribution networks.
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Fully self-powered operation eliminates auxiliary wiring needs
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High reliability in remote and unmanned substations
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Compact size for easy integration into switchgear panels
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Fast commissioning with preconfigured protection logic
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Stable performance during transformer energization events
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Strong coordination capability with upstream protection devices
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Reduced maintenance requirements over long service life
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Enhanced fault detection accuracy for feeder systems
Technical FAQs
1. Does the REJ603 REJ603BBB10NN3XC require an external power supply?
No, it is fully powered by current transformers.
2. What type of systems is it designed for?
It is designed for secondary distribution networks and RMU applications.
3. What protection functions are included?
It provides overcurrent and earth-fault protection with multiple stages.
4. Can it operate in unmanned substations?
Yes, it is specifically designed for remote and unattended installations.
5. What is the typical mounting method?
It is panel-mounted for switchgear integration.
6. Does it support transformer inrush detection?
Yes, it includes inrush detection functionality.
7. Is the relay suitable for industrial environments?
Yes, it is widely used in industrial power distribution systems.
8. What is the device weight?
Approximately 0.5–0.9 kg depending on configuration.
9. Does it support earth-fault protection?
Yes, it includes dedicated earth-fault protection stages.
10. Is maintenance required frequently?
No, it is designed for low-maintenance long-term operation.
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