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AQ-S255 bay control IED may be applied for demanding control applications. The AQ-S255 comes with full current, voltage, power, and energy measurement capability and may be equipped with additional I/O depending on application needs. Easy to use and powerful logic programming expands further the application range to more demanding control needs. Up to 11 optional I/O or communication cards can be inserted depending on application requirements. A large freely programmable HMI display provides a quick visualization of the object, alarm, and event status. The AQ-S255 communicates using various protocols including IEC 61850 substation communication standard.


  • Bay control unit with extensive IO
  • Synchrocheck for up to three circuit breakers
  • Up to class 0.2S power and energy measurement accuracy