Self-Powered Feeder Protection Relay – ABB REJ603
REJ603 is designed for selective short-circuit and earth-fault protection of feeders in secondary distribution networks, and for the protection of small transformers in utilities and industries. It is a CT-powered numerical relay intended for locations where auxiliary power is unavailable or unreliable, making it ideal for remote installations.It is mainly used in ring main units (RMUs) and secondary distribution switchgear. Variant 1.5 supports special CTs, while Variant 3.0 supports conventional CTs
Technical Specifications
Overcurrent and earth-fault protection
Suitable for systems with no auxiliary power or unreliable auxiliary supply
High operational suitability with low-energy trip coils
Built-in hand-reset electromechanical flag
Front USB powering removes need for internal battery and provides access to event/fault records when CT power is absent
Fast commissioning with selective test functions and test-trip capability
Event logs and disturbance records (Variant 3.0)
Full hardware and software self-supervision
Thermal overload, inrush detection, remote trip and measurement
Low-energy trip output and bi-stable outputs for CB tripping
USB port for powering up relay via laptop/PC/power bank when auxiliary supply and current inputs are absent (Variant 3.0)
Designed for RMUs and compact switchgear
Suitable for systems with no auxiliary power or unreliable auxiliary supply
High operational suitability with low-energy trip coils
Built-in hand-reset electromechanical flag
Front USB powering removes need for internal battery and provides access to event/fault records when CT power is absent
Fast commissioning with selective test functions and test-trip capability
Event logs and disturbance records (Variant 3.0)
Full hardware and software self-supervision
Thermal overload, inrush detection, remote trip and measurement
Low-energy trip output and bi-stable outputs for CB tripping
USB port for powering up relay via laptop/PC/power bank when auxiliary supply and current inputs are absent (Variant 3.0)
Designed for RMUs and compact switchgear
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