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ABB REJ603 REJ603BBB10NN3XB numerical relay

Brand:ABB PLC
Item No.:REJ603 REJ603BBB10NN3XB
Product Origin:Sweden
Product Dimensions:144 mm × 144 mm × 115 mm
Product Weight:3.2 kg
Payment:T/T, Western Union, Credit Card
Goods_stock:15
Shipping Port:Xiamen, China
Lead Time:1-3 Days
Condition:Brand New And Original
Warranty:1 Year
Certificate:COO
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Overview

The ABB REJ603 (REJ603BBB10NN3XB) is a compact, self-powered numerical relay engineered for dependable feeder and earth-fault protection in medium- and low-voltage distribution systems. As part of ABB’s proven protection relay portfolio, it is designed to operate without an external auxiliary power supply, drawing energy directly from current transformers. This makes it an excellent choice for remote substations, ring main units, and compact switchgear where reliability and simplicity are critical.

Technical Specifications

ItemDescription
ModelREJ603BBB10NN3XB
Product TypeNumerical Protection Relay
Protection FunctionsOvercurrent protection, Earth-fault protection
Power SupplySelf-powered via CT inputs
Current InputsPhase CTs, optional core balance CT
Output ContactsTrip and alarm relay outputs
Binary InputsAvailable for control and signaling
MeasurementPhase current and residual current
Event RecordingIntegrated event and fault recording
Mounting MethodPanel-mounted or compact switchgear installation
Operating TemperatureIndustrial-rated operating range
DimensionsApprox. 144 mm × 144 mm × 115 mm
WeightApprox. 3.2 kg


Typical Applications

The ABB REJ603 Numerical Relay is widely deployed in:

  • Secondary power distribution feeders

  • Ring main units (RMUs)

  • Compact and modular switchgear

  • Remote substations without auxiliary power supplies

  • Industrial power distribution networks

  • Small transformer and cable protection schemes

Its self-powered design makes it particularly suitable for installations where maintenance access is limited and system simplicity is valued.


Key Advantages

  • Self-Powered Operation – Eliminates the need for batteries or external auxiliary supplies

  • High Protection Reliability – Numerical protection logic ensures accurate fault detection

  • Compact Footprint – Ideal for space-constrained switchgear panels

  • Reduced Wiring Complexity – Fewer external power and control connections

  • Event Recording Capability – Supports fault analysis and maintenance planning

  • Long Service Life – Designed for continuous operation in demanding electrical environments


Technical FAQs

  1. What is the main purpose of the ABB REJ603?
    It provides feeder overcurrent and earth-fault protection in distribution systems.

  2. Does the REJ603 require an auxiliary power supply?
    No, it is fully self-powered via current transformers.

  3. Can it be used in remote substations?
    Yes, it is ideal for remote installations where auxiliary power is unavailable.

  4. What protection functions are included?
    Overcurrent and earth-fault protection with numerical processing.

  5. Is event recording supported?
    Yes, the relay includes internal event and fault recording.

  6. Can it protect small transformers?
    Yes, it can be applied to both feeders and small transformer protection.

  7. How is earth-fault current measured?
    Through residual current calculation or optional core balance CT input.

  8. Is it suitable for compact switchgear?
    Yes, its size and self-powered design make it ideal for compact panels.

  9. Does it support communication protocols?
    This model is primarily designed for standalone protection applications.

  10. What maintenance is required?
    Minimal maintenance is needed due to the absence of auxiliary power components.


Sales and Business Development

Phone: +8617350837383
E-mail: [email protected]
Skype: +8617350837383
WhatsApp: +8617350837383
Business hours: We Provide Online Support 24/7
Address: Room 1001, Jiuzhou Commercial Building, Xiamen, Fujian Province, China

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