MRU4 voltage and frequency protection

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MRU4 voltage and frequency protection

The MRU4 is a highly precise and reliable protection device with the latest dual-core processor technology and extremely simple operation.

The MRU4 protects electrical equipment from impermissible voltage drops, such as short circuits in the mains, and from impermissibly high voltages, such as those caused by load shedding or generator voltage regulator faults.

Due to its compact design, the MRU4 is ideally suited for installation in the low-voltage niche of compact SF6-insulated medium-voltage systems.

The protective functions of the MRU4 have been enhanced to meet the requirements of VDE-AR-N-4110/4120:2018.

We offer the device in the following configurations: MRU4-2A0AAA:

- 8 binary inputs, 6 binary outputs
- CT connection 1 A and 5 A (selectable)
- Housing type: built-in
- Without communication interface
- Normal environmental conditions
- Including a full version of the operating software Smart view for download.

The following protection functions are included in the scope of delivery:

ANSI: 27, 59, 59N, 81U/O, 60FL, 47, 86, 74TC , 81R, 78, ROCOF, 25

Available menu languages: English, German, Spanish, Russian, Polish, Portuguese, French, Romanian

For different configurations please contact us via e-mail:

Delivery time: in stock within 3-4 business days, otherwise 25 business days.

All prices plus packing and shipping.

More info about the product here.