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The service factor (SF) of an AC motor is a measure of continuous overload capacity at which a motor can operate without overload or damage, provided the other design parameters such as rated voltage, frequency and ambient temperature are within the manufacturers’ specifications.

Motor service factor is crucial in determining the overload capacity of any given motor. The maximum load an AC motor can carry without overheating or otherwise damaging the motor if rated voltage and frequency are supplied at the motor’s leads is given by:

Motor service factor is crucial in determining the overload capacity of any given motor. The maximum load an AC motor can carry without overheating or otherwise damaging the motor if rated voltage and frequency are supplied at the motor’s leads is given by: