MRM3-2IE Motor protection

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General HighTECH Line User Manual

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.

Benefits and Key Features

  • 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

Inputs and Outputs
Binary inputs 7
Current transformer inputs 4
Output relays 4
Watchdog relay 1
Protection ANSI
Time overcurrent protection 50/51
Earth fault protection 50N/51N
Thermal replica 49
Circuit breaker failure protection 50BF
Negative sequence protection 46
Motor protection: locked rotor 51
Motor protection: incomplete start 48
Motor protection: max. number of starts 66
Motor protection: undercurrent 37
Motor protection: thermal protection 49
Additional Features
Disturbance recorder
Fault recorder (none volatile)
Parameter sets 2
Modbus RTU (Option)
RS485 Open Data Protocol (Option)
Mounting Type
Housing is withdrawable
Housing suitable for door mounting
Housing suitable for mounting plate

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