Motor Protection

    Motor Protection

    The MRM4 is designed for the protection of motors. All the protection functions are based on current. The device offers motor protection functions, such as motor star-up and incomplete start-up sequence.

    The intuitive operating concept with plausibility checks and extensive commissioning functions such as the built-in fault simulator allows a safe and time-optimized maintenance and commissioning. The parameter setting and evaluation software Smart view can be used consistently across the entire family of devices.

    ANSI: 46, 49M, 49R, 49S, 50J, 37, 50, 51, 50N, 51N, 60L, 86, 50BF, 74TC

    Device MRM4
    Line HighPROTEC
    Binary inputs 8
    Analog Outputs Optional
    Control and detection of switchgears Yes
    Control and supervision of a circuit breaker (remote or local) 1
    Output relays 5
    Voltage transformer inputs 4
    Watchdog relay 1
    Earth fault protection [50N/51N] Yes
    Frequency gradient [81] Yes
    Frequency protection [81O/U] Yes
    IEC 60870-5-103 Optional
    Inrush stabilisation (2nd harmonic) Yes
    IRIG-B00X Yes
    Modbus (TCP) Optional
    Modbus RTU Protocol Optional
    Motor protection: incomplete start [48] Yes
    Motor protection: locked rotor [51] Yes
    Motor protection: max. number of starts [66] Yes
    Motor protection: thermal protection [49] Yes
    Motor protection: undercurrent [37] Yes
    Negative sequence protection [46] Yes
    Output relay matrix Yes
    Parameter sets 4
    Profibus DP Optional
    Programmable Logic Yes
    Reset / Blocking Yes
    Residual voltage [59N] Yes
    Resistance earthed / solidly earthed [50N/51N] Yes
    Time Synchronization via SNTP Yes
    Sensitive EF isolated/compensated [50SN/51SN] Yes
    Thermal replica [49] Yes
    Time Date Yes
    Time overcurrent protection [50/51] Yes
    Trip- and auxiliary relays [86] Yes
    Trip circuit resp. control circuit supervision [74TC] Yes
    Voltage transformer supervision [60FL] Yes
    IEC 61850 Optional
    Time Synchronization via Modbus Yes
    Time Synchronization via IEC 60870-5-103 Yes
    Demand Management Yes
    THD (Todal Harmonic Distortion) Protection Yes
    RTD Temperature Protection [23] Optional
    Disturbance recorder Yes
    Event recorder Yes
    Fault recorder (none volatile) Yes
    Motor Start Recorder Yes
    Trend recorder Yes
    ANSI: IEC:
    37; I<t
    46; I2>
    48; IANL
    49; J>,t
    50; I>,I>>
    50BF; CBF
    50N; IE>,IE>>
    51; I>t>, I>>t
    51LR; -
    51LRS; -
    51N; -
    66; -
    74TC; -


    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.