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Device

MRA4

MRI4

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LineHPTHPT
Current transformer inputs44
Voltage transformer inputs4 -
Binary inputs8(+8)8
Output relays6(+6)5
Watchdog relay11
Time overcurrent protection [50/51]YesYes
Inrush stabilisation (2nd harmonic)YesYes
Directional time overcurrent protection [67]Yes -
Earth fault protection [50N/51N]YesYes
Resistance earthed / solidly earthed [50N/51N]YesYes
Earth fault directional feature [67N]Yes -
Thermal replica [49]YesYes
Circuit breaker failure protection [50BF]YesYes
Voltage protection [27/59]Yes -
Residual voltage [59N]Yes -
Frequency protection [81O/U]Yes -
Frequency gradient [81]Yes -
Vector surge / mains decoupling [78]Yes -
Power direction [32/37]Yes -
Negative sequence protection [46]YesYes
Motor protection: thermal protection [49]YesYes
Current transformer supervision [60FL]YesYes
Voltage transformer supervision [60FL]Yes -
Auto reclosing AR [79]YesYes
Reset / BlockingYesYes
Time DateYesYes
Parameter sets44
Event recorderYesYes
Fault recorder (none volatile)YesYes
Disturbance recorderYesYes
Output relay matrixYesYes
Trip circuit resp.
control circuit supervision [74TC]		YesYes
Trip- and auxiliary relays [86]YesYes
Q->&V<Yes -
Modbus RTU ProtocolOptionalOptional
IEC 60870-5-103OptionalOptional
Profibus DPOptionalOptional
Modbus (TCP)OptionalOptional
IRIG-B00XYesYes

All shown details without any guarantees! We reserve the right of changes without prior notice.
*Only the basic device structure is shown. Differences in detail are possible.