Asian Power

Protection Relay


Motor Protection

The MRM4 is designed for the protection of motors. All the protection functions based on current, as well
as monitoring functions such as motor start-up and incomplete start-up sequence for motor protection are
covered by the MRM4.

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The MRM4 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. The MRM4 provides all necessary functions to protect low and medium voltage motors at all power levels. The protection functions are based on current measurement.
They supervise the motor start sequence (motor start), they detect a stall or locked rotor condition and they monitor the thermal condition of the motor. Overcurrent and earth overcurrent protection as well as unbalanced load protection are included in the protection package. The status and operation of the motor will also be monitored by means of the statistic and trend recorder. All important events and measuring values will be logged by means of the start, event, failure and disturbance recorder. The protection functions of the MRM4 have been adapted to comply with the requirements of the VDE‑AR‑N‑4110:2018.


  • Motor Protection Functions
  • System Supervision Functions
  • History Counter
  • Logic equations for protection
  • Total Counter
  • Motor Start Recorder
  • Statistic Recorder
  • Additional Recorder
  • Communication Options
  • PC Tools
  • Commissioning Support
  • Time Synchronization
  • IT Security
  • Wattmetric Ground Fault Protection


  • 20 mA output (Type MRM4-2B)
  • Long starting time for reduced voltage starts
  • Emergency Start
  • Incomplete Sequence
  • Anti-backspin Time Delay
  • Permitted number of cold starts
  • Supervision of starts per hour
  • Mechanical load shedding
  • Zero speed indication via input
  • Motor Stop Inputs
  • External alarm and trip inputs


Current Inputs

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

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:
141.5 mm × 173 mm × 209 mm
5.571 in. × 6.811 in. × 8.228 in
Door Mounting:
141.5 mm × 173 mm × 209 mm
5.571 in. × 6.811 in. × 8.228 in

Weight (max. components)

approx. 2.9 kg / 6.393 lb



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