Product Description
ABB REJ603BB401NN3XE is a high-performance self-powered numerical feeder protection relay of the ABB Relion 605 series, serving as a core protection and control device for medium and low-voltage power distribution networks. The relay requires no external auxiliary power supply and operates directly via current transformers, perfectly adapting to remote sites and complex distribution scenarios without auxiliary power. It integrates three-phase overcurrent protection, earth fault protection and short-circuit protection, supporting definite-time and multiple inverse-time characteristic curves to realize selective fault isolation and grid interlock for feeders and transformers. Adopting an industrial compact modular structure with built-in HMI, it supports fast DIP switch configuration, featuring strong anti-interference capability, wide temperature adaptability and stable long-term operation. As an original genuine power protection component, it is widely used for power grid renovation, equipment maintenance and system upgrading, ensuring safe and compliant operation of distribution networks.
2. Technical Parameters
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Part Number：REJ603BB401NN3XE
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Product Series：ABB Relion 605 Series
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Product Type：Self-powered numerical feeder protection relay, power distribution protection unit
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Power Supply Mode：CT self-powered (no external auxiliary supply required), optional USB auxiliary power
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Core Protection Functions：Three-phase overcurrent protection, short-circuit protection, earth fault protection, selective trip interlock
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Protection Characteristics：Definite-time & multiple inverse-time curves (NI, VI, EI, LTI, RI, HR, FR)
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Configuration Method：Front DIP switch quick setting, simple commissioning
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Structural Features：Integrated HMI interface, clear status display and visual fault recording
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Compatible Equipment：Ring Main Unit (RMU), MV/LV secondary switchgear, distribution feeders, distribution transformers
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Performance Features：Strong anti-EMI capability, wide working temperature, fast response, high protection accuracy, maintenance-free
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Working Condition：Remote outdoor distribution stations, industrial power systems, municipal power grid, 24-hour continuous operation
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Product Attribute：Original genuine core power protection spare part of ABB
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Supply Status：New original in stock, high-quality used and fully tested refurbished products available
3. Application Scope
This protection relay is specially designed for medium and low-voltage secondary distribution networks. It is widely applied in municipal power grids, industrial and mining power systems, rail transit infrastructure, industrial park power rooms and outdoor ring main units. It provides precise overcurrent, short-circuit and earth fault protection and isolation for distribution feeders and small power transformers, realizing fast fault location, selective tripping and system safety interlock. It is commonly used for old power equipment renovation, faulty protection unit replacement, distribution system expansion and new power project installation. It is an essential core protection device to ensure the safe, stable and reliable operation of power distribution systems.
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