MRM3-2IE Motor protection (MRM32I1E1D.)

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Product number: MRM32I1E1D.


The motor protection relay MRM3-2 offers reliable protection for LV and MV motors which are either operated via power contactors or power circuit breakers.

The following functions are integrated into this relay:

  • Overload protection acc. to IEC 255-8 in consideration of the initial load factor (thermal image)

  • Definite undercurrent protection

  • Definite time over current protection (DMT)

  • Inverse time over current protection (IMT) with select-able trip characteristics

  • Short-circuit protection

  • Load unbalance supervision with definite or inverse trip characteristics

  • Earth-fault detection with suppression of harmonics

The MRM3-2 recognizes the “Start-Up“ and “Motor Running“ phase. Motors with a limited number of starts can be controlled by the start limiting function of the relay.

The earth-fault supervision is either realized in Holm-green connection or by means of a core-type current transformer.

The motor can be stopped in delayed or undelayed mode via digital inputs.

  • 19“ racks – fully withdrawable

  • Door mounting – withdrawable and sealable

  • Panel mounting – fully withdrawable

  • Fault / disturbance recorder

  • Intuitive HMI

  • Display (of primary values)

  • Easy setting software – Smart view

  • Compact form factor

  • Start Cycle Supervision

  • Overload

  • Jam / Locked Rotor

  • Underload

  • Unbalanced Load

  • Number of Starts, Counters,…

  • Keeping motor load under the Thermal Damage Curve

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