Restricted earth-fault and residual earth-fault relay SPAJ 115 C

Not active product since 2009

The combined restricted earth-fault and residual earth-fault relay SPAJ 115 C is intended to be used for the earth-fault protection of power generators, motors and transformers.

The relay contains two energizing input circuits, that is, a differential earth-fault current circuit and a residual earth-fault current circuit.


  • Combined restricted earth-fault and residual earth-fault protection

Product benefits

  •  Protection for a variety of power distribution applications

Product features

  • Sensitive restricted earth-fault protection stage for fast, selective earth-fault protection
  • Sensitive definite time or inverse time earth-fault stage for back-up residual earth-fault protection
  • Output relay functions freely configurable for desired relay operations
  • Flexible adaptation of the relay to different types of application
  • Local numerical display of setting values, measured values and recorded fault values
  • Serial interface for two-way data communication over fibre-optic bus between relay level and superior system levels
  • Accurate settings and stable functions due to fully digital relay design
  • High immunity to electrical interference and robust aluminum case to class IP54
  • Continuous self-supervision of hardware and software, including auto-diagnostics
  • Powerful optional software support for setting, reading, copying and recording relay parameters

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