Information about AC Motor Starters

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About AC Motor Starters

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 current the contactor can withstand without overheating; or the operational current, the contactor’s ability to make or break the current. Choices for IEC-rated products include A, B, C, D, E, F, G, H, J, K, L, M, and N. Typically, AC motor starters also carry ratings for continuous current, thermal current, motor voltage and AC horsepower. Number of poles, control voltage, current-line acceleration, time-limit acceleration and operating temperature are also important parameters to consider when selecting AC motor starters.

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Engineering Web: AC Motor Starters - Machine Design

Pages: 1 - 3 of 104

Electric Motors & DC Motors This section is split into the electric motor type: AC motors, DC motors, stepper motors and electrical drives.
Motor Starters \| Machine Design Full-voltage, single-speed motor starters: Single-speed squirrel-cage motors have starters that fall into two categories: full-voltage or
Self-Protecting Starters \| Machine Design Self-protected starters are sized for the horsepower and full-load current of the motor.

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