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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 -
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
Modbus RTU Protocoloptionoption
IEC 60870-5-103optionoption


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.