AQ-50-XXXX1 for one feeder bay
AQ-50-XXXX1 (left)
AQ-50-XXXX1 (left)


The AQ-50-XXXX1 fault detection device for one (1) feeder leaves no fault in distribution networks unnoticed. It has a superior capability to detect even the most challenging faults, such as high-impedance and intermittent earth faults with a fault current as low as 0.5 A; this allows it to deliver a fault detection accuracy you can rely on.

The AQ-50 fault detection is based only on phase current measurements. This saves space and significantly reduces costs as there is no need for separate voltage measurements. All this makes AQ-50 devices easy to fit in both new and retrofit installations. The AQ-50 devices are applicable to any type of cable or overhead line distribution network whether they are compensated, isolated, or directly earthed. 


  • Fault indication for one (1) feeder.
  • 16 binary inputs.
  • 8 binary outputs.
  • 3 phase current inputs (1 A).
  • Built-in web interface.
  • 24…48 V DC power supply.
  • Options:
    • PLC functionality as IEC 60870-5-101 Master.
    • Advanced automation functions (FLISR).

Read more about our fault detection technology. Additionally, learn more about how our accessories and software tools work for your application!

AQ-50-XXXX1 (left)

Technical data

  • Overcurrent detection (2 stages)
  • Earth fault detection (directional)
  • Earth fault detection (non-directional)
  • Phase break detection
  • Disturbance recorder
  • Fully automated fault location, isolation, and service restoration (FLISR) (optional)
  • PLC functionality (optional)

  • Phase currents
  • Residual current
  • Temperature
  • Fault current
  • Maximum load current
  • Current average of 15 minutes

  • 16 binary inputs
  • 8 binary outputs
  • 3 current inputs
  • 24...48 V DC power supply
  • RJ-45 Ethernet (10/100Base)
  • RS-485 serial port
  • USB, type B

  • Communication ports
  • RJ-45 Ethernet (100 MB)
  • RS-485
  • Communication protocols
  • IEC 60870-5-101
  • IEC 60870-5-104
  • IEC 60870-5-101 Master (optional)


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