AC motor starters are used to turn-on and turn-off electric motors and motor-controlled equipment. They use solid-state or electromechanical technologies, and are designed for single-phase or three-phase motors. AC motor starters adhere to ratings from the National Electrical Manufacturers Association (NEMA) and the International Electrotechnical Commission (IEC).
There are 11 NEMA size ratings: 00, 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. IEC sizes are rated at the thermal current rating, the...
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