MRI1-IE Time overcurrent relay with Multi-Characteristic

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General HighTECH Line User Manual

The MRl1 digital multifunctional relay is a universal time overcurrent and earth fault protection device intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for networks with a solidly earthed/resistance-earthed neutral point.

The protective functions of MRI1 which are implemented in only one device are summarized as follows:

  • Independent (Definite) time overcurrent relay.

  • Inverse time overcurrent relay with selectable characteristics.

  • Integrated determination of fault direction for application to doubly infeeded lines or meshed systems.

  • Two-element (low and high set) earth fault protection with definite or inverse time characteristics.

  • Integrated determination of earth fault direction for application to power system networks with isolated or arc suppressing coil (Peterson coil) neutral earthing. (ER/XR-relay type).

  • Integrated determination of earth short-circuit fault direction in systems with solidly-earthed neutral point or in resistance-earthed systems (SR-relay type).

  • Furthermore, the relay MRI1 can be employed as a back-up protection for distance and differential protective relays.

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 4
Output relays 4
Watchdog relay 1
Protection ANSI
Time overcurrent protection 50/51
Earth fault protection 50N/51N
Circuit breaker failure protection 50BF
Additional Features
Fault recorder (none volatile)
Parameter sets 1
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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