MRU4 Voltage Protection (MRU4-2A0AAA)

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Product number: MRU4-2A0AAA

Configuration

The MRU4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and reliable protective functions and is very easy to operate.

It is designed to protect electrical equipment from dangerous voltage fluctuations.

For example protection against under voltages caused by mains shortcircuits, or overvoltages due to load shedding or failure of a generator voltage controller.

Its compact design makes the MRU4 ideal for installation within the LV terminal compartments of compact SF6-insulated MV systems.

The protection functions of the MRU4 have been adapted to comply with the requirements of the VDE-AR-N-4110:2018.

Functional Overview

MRU4 Functional Overview

Approvals

CE Logo
UL Logo

UL File Nr.: E217753

certified regarding UL508 (Industrial Controls)

CSA Logo

CSA File Nr.: 251990

certified regarding CSA-C22.2 No. 14 (Industrial Controls)

EAC Logo

EAC

certified by EAC (Eurasian Conformity)

KEMA Labs

KEMA

Type tested (and certified) regarding IEC 60255‑1 and regarding IEC 61850

TÜV Nord, VDE-AR-N 4110 (2018-11)

Component certificate regarding the German grid code standard VDE-AR-N 4110 (2018-11)

TÜV Nord, VDE-AR-N 4120 (2018-11)

Component certificate regarding the German grid code standard VDE-AR-N 4120 (2018-11)

  • Complies with IEEE 1547‑2003

  • Amended by IEEE 1547a‑2014

  • Complies with ANSI C37.90‑2005

  • Complies with “Engineering Recommendation G99 Issue 1 Amendment 6 – March 2020”

  • Wide range power supply: 24 … 270 VDC / 48 … 230 VAC

  • VT measurement from 0 V up to 800 VAC

  • Plausibility verification intelligence

  • Optimized functional overview by hiding unused functions, parameter and assignments

  • On-board testing without removing the wiring

  • Menu Languages supported: English, German, Spanish, Portuguese, French, Russian, Polish, Romanian

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

  • Over- / Undervoltage protection.

  • Protection of High, Medium and Low Voltage feeders against overvoltage (insulation damage) and undervoltage.

  • Frequency based protection option, examples:

    Over-/Underfrequency supervision

    Load shedding by ROCOF

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