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New Features – release 3.6
∙ VDE-AR-N 4110
∙ G99 Issue 1 Amendment 3
∙ Wattmetric Ground Fault Protection
∙ IEC 60870-5-104
∙ SCADApter for Retrofit
∙ Usability improvements
∙ IT Security
∙ Improved Frequency and ROCOF precision*


The MRA4 is a high precision and reliable protection and control relay. The intuitive setting concept with plausibility test enables reliable and time optimized configuration of the extensive protection function to a variety of applications such as incoming or outgoing feeder protection, network protection and generator protection.
The implemented switchgear management guaranties an efficient and safe control and supervision.
The device is a bench mark in flexibility and usability and offers various communication options. The hardware is designed for all nominal values in combination with protection and control
functionality. The parameterizing and analyzing software Smart view SE is usable for each HighPROTEC device and free of charge

Interconnection Package
The comprehensive interconnection package is summarized within one menu:

  • Non-discriminating active power direction depending load shedding
  • FRT (LVRT): Settable FRT-Profiles, optional AR coordinated
  • QV-Protection: Undervoltage-Reactive
    Power protection
  • Automatic Reconnection
  • Considerably frequency protection package: Six elements configurable as f<, f>, df/dt (ROCOF), Vector Surge
  • CB-Intertripping
  • Synch Check (Generator to mains, mains-to-mains), options e.g. to switch onto dead bus

Comprehensive protection package(1)

  • Six elements phase overcurrent protec-tion directional and non-directional (ANSI/IEC/51C/51V)
  • Four elements earth fault protection non-directional or directional (multi-polarising)
  • Wattmetric Ground Fault Protection
  • Two elements unbalanced load protection
  • Voltage protection six elements selectable: V<, V>, V<(t) (2)
  • Six elements unbalanced voltage supervision
  • Flexible Fourth Voltage measuring input 2 elements VE> or VX (for synch-check)
  • Synchro-check options Generator-to-System or System-to-System
  • Each of the six elements frequency protection can be used as: f<, f>, ROCOF, vector surge…
  • Six elements power protection each can be used as: P>, P<, Pr, Q>, Q<, Qr, S>, S<
  • Two elements power factor (PF) (2)


  • Disturbance recorder: 120 s non volatile
  • Fault recorder: 20 faults
  • Event recorder: 300 events
  • Trend recorder: 4000 non volatile entries


  • 1 breaker
  • Breaker wear

– Released
– Up to 80 logic equations for protection, control and monitoring

Communication options
– IEC 61850
– Profibus DP
– Modbus RTU and/or Modbus TCP
– IEC 60870-5-103
– IEC 60870-5-104
– DNP 3.0 (RTU, TCP, UDP)
– SCADApter for Retrofit