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DS1 DC Current Sensor – Detecting Very Low DC Current Levels

DS1 – DC Current Sensor in a Compact, One-Piece Design for Detecting Very Low DC Current Levels.

The DS1 DC current switch is smaller than other DC current sensors and simpler to use. It is non-adjustable so the output closes when there is current and opens with there is no current. It uses the same circuit voltage to power the sensor as the circuit being controlled so it is easier to install than other sensors. The DS1 current sensor can be powered by any DC voltage between 10 and 28 volts, and the solid state “contact” closes with a minimum of 0.75 amps DC through the sensing window. The contact can control a DC load up to one amp, up to 30 VDC.


  • Compact design means it easily fits in crowded control cabinets
  • Safer than shunt/relay combination
  • Sensor power and switched load share a common point making
  • installation easy
  • Detects even low DC current levels


  • As a Safety Interlock it is a non-intrusive method to keep
  • personnel safe
  • Alarm contact when a load is operating or when it is not energized
  • Detect PV system leakage by monitoring the earth bond conductor
  • Use the contact to turn on a lighting circuit when a load is energized
  • Instant indication of equipment status
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ATS AC Current Transducer

The ATS AC Current Transducer/Switch. Monitoring High Current Loads Easy and Safe.

The new ATS Series is specifically designed to protect loads with current levels up to 1200A. This patent pending, one-piece solution combines a limit alarm (switch) with an analog output signal transducer. The large sensing window provides complete isolation between the primary circuit and the controls. The ATS eliminates the need to use a screwdriver inside an energized control panel to manually adjust the sensor. Helps with NFPA70E compliance.


  • Patented rotary switch setpoint selection (patent pending).
  • Output is magnetically isolated from the input for safety.
  • Analog signal powered from the sensor; no loop powered required.
  • 4-20mA signal proportional to 0-1200 AC Amps.
  • Single Pole Double Throw Relay changes state with power to sensor.
  • LED indication if power is removed from the sensor or primary current exceeds adjustable trip point.
  • Integral DIN rail mount with spring loaded mounting clips.


The ATS eliminates the need to connect multiple components to monitor high current loads. It can be used to directly monitor AC motor loads to 500 horsepower.

Monitor air handling blowers, pumps, crushers and many other large loads with one self-contained current switch (limit alarm) while also using the built in analog signal to spot bearing wear and other issues before they cause a break down. As a tool in your preventive maintenance tool kit, the ATS is incomparable.

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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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AC Mini Current Sensor

The CS-6XX-XX series of mini current sensors monitor line current for electrical loads such as pumps, conveyors, machine tools or fans and provide an output of 4-20 mA, 0-5 Vdc or 0-10 Vdc (Model specific) to represent the load current.

The CD-650 & CS-651 series require no external power supply as they are totally powered by induction from the AC line being monitored. The CS-652 series is loop-powered and require an external 15-30 Vdc power supply.


  • No field adjustment necessary, factory calibrated
  • 0-5 Vdc, 0-10 Vdc or 4-20mA models
  • Average measurement is equivalent to True RMS for pure sine waves
  • Input / Output isolation via current transformer
  • Solid-state reliability
  • Small compact size
  • Solid, reliable mounting method

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