A compressor includes an electric motor and a protector device. The motor drives a compression mechanism and has a rotor and a stator. The stator includes aluminum windings. The protector device is attached to the stator and is configured to disconnect the motor from a power supply when an input voltage of the power supply to the motor is less than a threshold voltage value set at a level between a minimum run voltage and an overheat voltage of the compressor. The overheat voltage corresponds to an overheat temperature of the motor. The threshold voltage value is set at a level that is between the minimum run voltage and the overheat voltage. The protector device includes a tolerance level such that the threshold voltage minus the tolerance level is greater than the overheat voltage and the threshold voltage plus the tolerance level is less than the minimum run voltage.