The Personal Blender is equipped with a thermo-protection feature. The Motor Base will automatically shut off if the motor has overheated. Should this happen, unplug the unit and cool down for 20 minutes before restarting the operation.Refer to the Personal Blender Original PB-150 / PB-250 / PB-250XL / PB-350 / PB-350XL user manual for more information.