AQ-M257 Motor Protection IED

AQ-M257 motor protection IED modular protection and control solution for larger and more important motors that require differential protection.

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    Up to nine (9) I/O or communication cards can be added 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-M257 communicates using various protocols, including the IEC 61850 substation communication standard.


    • Differential protection
    • 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