High Performance Current Sensing for Automation Applications
1-800-959-4014 | sales@nktechnologies.com
NEMA Motor Loads and Product Selection

In North America and some other parts of the world, motors are rated in horsepower (HP). Although there are many voltages supplied by the serving utilities, 460 VAC three phase, 60 hertz (hZ), is the most common. This table 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.

HPAverage FLA
460 VAC 60 hZ
Average Responding
50-60 hZ
True RMS
Distorted; Wave Form
Range
0.51.1AT0ATR0low
0.751.5AT0ATR0low
1.01.9AT0ATR0low
1.52.5AT0ATR0high
23.1AT0ATR0high
34.5AT0ATR0high
56.7AT1ATR1low
7.510.8AT1ATR1mid
1013.7AT1ATR1mid
1520.2AT1ATR1high
2025.8AT1ATR1high
2532.3AT1ATR1high
3038.2AT1ATR1high
4050.8AT2ATR2low
5062.3AT2ATR2low
6074.3AT2ATR2low
7591.4AT2ATR2low
100124AT2ATR2mid
125156AT2ATR2high
150180AT2ATR2high
200240AT3ATR3low
250302AT3ATR3low
300361AT3ATR3low
350414AT3ATR3mid
400477AT3ATR3mid
450515AT3ATR3high
500590AT3ATR3high

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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