AQ-S391 Bay control device
AQ300_full rack_web_2
AQ300_full rack_web_2


The AQ-S391 bay control device can be applied to various types of control and monitoring applications (extrahigh-voltage, high-voltage and medium-voltage applications). The modular hardware construction offers many options for different kinds of bay configurations: you can add up to nineteen (19) I/O cards, which allows for a variety of analog and digital signals both in type and quantity. The versatile and programmable software logic allows for extensive customization for the standard configurations provided with the device.


  • Control and monitoring for a full diameter of single, double, or one-and-a-half circuit breaker busbar configurations.
  • Local and remote control.
  • Status indication for of up to twelve (12) controllable objects.
AQ300_full rack_web_2

Technical data

  • Circuit breaker failure protection (CBFP; 50BF/52BF)
  • Disconnector control
  • Dead line detection

  • Voltage transformer supervision (60)
  • Synchrocheck (ΔV/Δa/Δf; 25)

  • Standard
  • CPU module (MM/ST + RJ-45)
  • Power supply module (PS + fault relay + 2 trips)
  • Number of empty slots: 19
  • Options
  • Current measurement module
  • Voltage measurement module
  • 6 digital inputs (1x6) + 5 digital outputs
  • 8 digital inputs (1x8)
  • 12 digital inputs (3x4)
  • 16 digital inputs (2x8)
  • 9 digital inputs (3x3) with IRIG-B (BNC)
  • 8 digital outputs (1x8)
  • 12 digital outputs (4x3)
  • 16 digital outputs (2x8)
  • Trip module (4 outputs)
  • 4-channel RTD module
  • 4-channel analogue input module (2-wire)

  • Communication inputs
  • RJ-45 100 Mbps Ethernet + MM/ST fiber optic Ethernet
  • 2 x ST/MM redundant fiber optic Ethernet (optional)
  • ST/MM fiber optic Ethernet and RS-485 (optional)
  • LC/MM and RJ-45 (optional)
  • 2 x LC/MM (optional)
  • PRP/HSR (optional)
  • Communication protocols
  • IEC 60870-5-101/104/103
  • Modbus/RTU and Modbus/TCP
  • DNP3.0
  • IEC 61850 (optional)

  • Customization service
  • PMU capability (optional)
  • Advanced "CyberProtect" cyber security feature (optional)

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