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ASO Low-Current Sensors

ASO Low-Current Sensors from NK Technologies are specialised current operated switches which combine an ultra-sensitive current transformer and signal conditioning electronics into a single package for sensing AC current from 3-350mA.

Useful for signal or lamp status monitoring, detecting minute fault currents or fan proving, the ASO features solid-state outputs and jumper-selectable ranges, which make it a versatile choice for low-current status indicating applications.


  • Fan Monitoring
  • Fan status in heating and drying applications
  • Identify lamp outages or other malfunctions through changes in current consumption
  • Fractional HP Motors
  • Ideal for monitoring small motors used in critical applications; for example, fan-proving on a crucial cooling fan
  • Fault current sensing
  • Detects low levels of current resulting from fault conditions.


  • Wide range of output options
  • Dependable, solid state switch N.O. or N.C. contacts rated at 240VAC or 30VDC
  • Compatible with standard automation controllers.
  • Isolated inputs and outputs:
  • Inductive sensing eliminates insertion loads on monitored circuit, effectively isolating it from unit
  • Isolated outputs simplify wiring and enhance safety.
  • Adjustable Setpoint’s:

Setpoints are field adjustable from 3mA to 350mA, speeding installation and allowing for tailored applications. UL, CUL and CE approval accepted worldwide.

The ASO Low-Current Sensors are available from Sensit.

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