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High Performance Current Sensing for Automation Applications
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IEC Metric Motor Loads and Product Selection

In many parts of the world, motors are rated in kilowatts (kW). Although there are many voltages supplied by the serving utilities, 380 VAC three phase, 50 hertz (hZ), is the most common. The table below will help in selecting which current transducer to use when monitoring a specific motor load.

Please keep in mind that these full load amperages (FLA) are averages based on four-pole motors. It is good practice to ask the customer what current level they plan on monitoring.

AC Current Transducer Ranges

AT and ATR Series: Field selectable within each model; AT0 Series: 0–2 and 0–5 amps; AT1 Series: 0–10, 0–20 and 0–50 amps; AT2 Series: 0–100, 0–150, and 0–200 amps; ATR Series: 0–100, 0–150, and 0–200 amps. Always select a model with a range lower than the actual load being monitored.

KWAverage FLA
380 VAC 50 hZ
Average Responding
50-60 hZ
True RMS
Distorted Wave Form
Ranges
0.371.24AT0ATR0low
0.752.13AT0ATR0high
1.53.82AT0ATR0high
2.25.18AT1ATR1low
3.78.03AT1ATR1low
5.512.0AT1ATR1mid
7.515.2AT1ATR1mid
1121.6AT1ATR1high
1528.3AT1ATR1high
18.536.0AT1ATR1high
2243.9AT1ATR1high
3058.6AT2ATR2low
3772.8AT2ATR2low
4583.8AT2ATR2low
55108.0AT2ATR2mid
75172AT2ATR2high

This chart covers just the most common models NK Technologies manufactures. There are many newer products with higher and lower ranges, many in split core housings which may make your installation easier. Contact our applications support specialists at the factory for help selecting a product to fit your needs.

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