Asian Power

Protection Relay


Directional Feeder Protection

The MRA4 is specifically tailored to the protection of incoming and outgoing feeders in MV systems and can be  sed for grid and generator protection.

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The MRA4 is a high precision and reliable protection and control relay for feeder, grid and generator applications. The intuitive setting concept with plausibility test enables reliable and time optimized configuration of the extensive protection function to a variety of applications such as incoming or outgoing feeder protection, network protection and generator protection. The implemented switchgear management guaranties an efficient and safe control and supervision. The device is a bench mark in flexibility and usability and offers various communication options. The hardware is designed for all nominal values in combination with protection and control functionality. The parameterizing and analyzing software Smart view SE is usable for each High-PROTEC device and free of charge. The MRA4 is available in 384 variants, that cover all combinations of properties that you might need or not need for your application. Each variant is uniquely specified by a typecode of form MRA4-2xxxxx (i.e. 5 digits/letters following the ‘-2’). Check the Order Form (depicted below, or in the brochure DOK-FLY-MRA4-2E or in the user manual MRA4-3.6-EN-MAN) for a complete overview.


  • Comprehensive protection package
  • THD protection power quality
  • Demand Management/ peak values
  • Interconnection Package
  • Sliding-mean-square Supervision
  • Recorders
  • Logic equations for protection
  • Time Synchronisation
  • Commissioning Support
  • Communication Options
  • IT Security
  • Control
  • PC Tools


Current Inputs

4 (1 A and 5 A) with automatic CT Disconnect

Voltage Inputs

4 (0 … 800 V)

Digital Inputs

Switching thresholds adjustable via software

Power Supply

24 VDC – 270 VDC / 48 VAC – 230 VAC (−20/+10%)


All terminals plug type

Type of enclosure


Dimensions of housing (W x H x D)

19“ Flush Mounting:
212.7 mm × 173 mm × 208 mm
8.374 in. × 6.811 in. × 8.189 in
Door Mounting:
212.7 mm × 183 mm × 208 mm
8.374 in. × 7.205 in. × 8.189 in

Weight (max. components)

approx. 4.7 kg / 10.36 lb

Product Certification

A Manufacturer’s Certificate of Origin, also known as a Manufacturer’s Statement of Origin, is a specified document certifying the country of origin.



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