Feeder protection relay SPAS 348 C

Not active product since 2009 

The feeder protection relay SPAS 348 C is used in applications, which require directional phase overcurrent, directional short-circuit and directional earth-fault protection. Typically, the relay is used for the overcurrent and earth-fault protection of infeeders and busbars in distribution substations provided with multiple infeeders supplied via power transformers from the same high-voltage busbar system.

The relays are also applied for the selective short-circuit and earth-fault protection of parallel multiple feeders between substations and for feeder protection in ring-type and meshed distribution networks. Further, directional relays are used for the protection of radial feeders supplied with a small back-feed of energy from a generator in the consumer-end of the feeder.


  • Directional phase overcurrent, directional short-circuit and directional earth-fault protection

Product benefits

  • Protecting transformer and generator assets

Product features

  • Three-phase overcurrent protection with two directional stages and one non-directional high-set stage
  • Two-stage directional earth-fault protection or alternatively three-stage residual voltage protection
  • Eight freely configurable output relays and output relay for internal relay fault
  • Special memory circuit for maintaining the stability and reliability of the direction measurement at close three-phase faults
  • Four heavy-duty relays for CB control and five relays for signalling purposes
  • Continuous self-supervision of relay hardware and software for enhanced system reliability and availability

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