MRI1-IE Time overcurrent relay with Multi-Characteristic (MRI1I1E1D.)

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Product number: MRI1I1E1D.


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.

  • 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.

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