ABB REJ603 CT-Powered Overcurrent Protection Unit
Description
ABB REJ603 CT-Powered Overcurrent Protection Unit is a self-powered digital relay designed for selective short-circuit and earth fault protection of feeders in secondary distribution networks, as well as transformer protection in utility and industrial applications.
| Specification | Value |
|---|---|
| Power Supply | Derived from current transformers, no external auxiliary power required |
| Earth Fault Measurement Mode | Internal vector summation or external Core Balanced Current Transformer (CBCT) input |
| Protection Characteristics | DMT (Definite Minimum Time) and IDMT (Inverse Definite Minimum Time) |
| Trip Output Type | Capacitive discharge pulse for low-energy trip coils |
Key Features:
- Self-powered three-phase non-directional overcurrent and earth fault protection with DMT and IDMT characteristics
- Dual earth fault measurement modes for flexible configuration
- Integrated IEC and special IDMT curves to meet time coordination requirements for secondary distribution protection
- Protection blocking via second harmonic measurement to ensure stability during transformer magnetizing inrush
- Built-in manually resettable electromechanical flag for trip indication
- Easy setup via DIP switches with protective transparent cover
Applications:
- Ring Main Units (RMU) in secondary distribution networks
- Feeder protection in secondary power distribution systems
- Transformer protection in utility and industrial facilities
- Remote locations without access to external auxiliary power
Related Models:
- ABB REJ513 Overcurrent Relay
- ABB REF610 Feeder Protection Relay