MRIK3-IE Time Overcurrent/Earth Fault Current Relay with Auto Reclosing and Control Function

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MRIK3 User Manual

General HighTECH Line User Manual

The MRlK3-IE digital multifunctional relay is a universal time over current and earth fault protection device with integrated auto reclosing relay intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for net-works with a solidly earthed/resistance-earthed neutral point.

In transmission line networks more than 70% of the occurring faults are transient (electric arcs extinguish, branches are falling on the overhead lines etc.)

With the application of the automatic reclosing (AR) together with protection relays, many electric arcs are extinguished through temporary interruption of the energy supply.

Without utilizing the automatic reclosing (AR) power supply interruptions would occur quite frequently.

Statistics have shown that yet part of the faults remain after the first fast AR can be cleared with a longer 2nd AR interval. The digital multi-shot, three phase auto reclosing relay MRIK3-IE fulfills these requirements for use on medium voltage transmission or distribution systems, by 4-element AR with variable adjustable dead times.

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.

  • Auto reclosure option to fix short duration faults (like bird flying through overhead lines, ice on lines, lightning’s hitting overhead lines, wind caused arcing by on overhead lines.

Inputs and Outputs
Binary inputs 5
Current transformer inputs 4
Output relays 4
Watchdog relay 1
Protection ANSI
Time overcurrent protection 50/51
Earth fault protection 50N/51N
Circuit breaker failure protection 50BF
Auto reclosing AR 79
Additional Features
Disturbance recorder
Fault recorder (none volatile)
Parameter sets 2
Modbus RTU
Mounting Type
Housing is withdrawable
Housing suitable for door mounting
Housing suitable for mounting plate

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