MRI1-IU Voltage controlled time overcurrent relay

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General HighTECH Line User Manual

The digital multifunctional relay MRI1-IU is a universal protection device for alternators and other equipment.

It provides the following functions:

  • Independent (definite) time overcurrent protection (DMT)

  • Inverse time overcurrent protection (IDMT) with the following selectable characteristics: Normal Inverse, Very Inverse, Extremely Inverse, Automatic change over characteristic by undervoltage

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


  • Interconnection of renewable energies (DER – distributed energy resources) to the public grid.

  • Protection of High, Medium and Low Voltage feeders against thermal damages by overload or short circuit currents.

Inputs and Outputs
Binary inputs 2
Current transformer inputs 3
Output relays 4
Voltage transformer inputs 3
Watchdog relay 1
Protection ANSI
Voltage Restraint Overcurrent Protection
Time overcurrent protection 50/51
Additional Features
Parameter sets 1
Mounting Type
Housing is withdrawable
Housing suitable for door mounting
Housing suitable for mounting plate

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