The ABB SPAJ110C is a secondary earth-fault relay designed for selective earth-fault protection in medium-voltage power systems. It can be used for either primary or back-up protection in solidly earthed or low-resistance earthed systems.
- Selective earth-fault protection
- Primary or back-up protection
- Solidly earthed or low-resistance earthed systems
- Feeders, transformers, generators, and motors
- Residual voltage relay cooperation
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