AQ-M255 Motor Protection IED

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The AQ-M255 motor protection IED offers a modular protection and control solution for larger and more important motors that require a large I/O capacity. You can add up to eleven (11) I/O or communication cards into the device for extensive monitoring and control applications. You can also connect up to sixteen (16) RTD signals for thermal alarming and tripping. AQ-M255 communicates using various protocols, including the IEC 61850 substation communication standard.


  • Powerful motor management with a large I/O capacity
  • Five (5) thermal models (time constant accurate)
  • Soft start protection beginning from 6 Hz
  • Star-delta started motor supervision
  • Two-speed motor protection
  • Optional power and energy class 0.2S
  • Asynchronous and synchronous motors