Qualtek brushless DC fans are available with IC motor protection. The IC is used to control the start up of the fan, protect the motor from overheating during locked rotor situations, and if possible, to restart the motor. During locked rotor situations as shown in the diagram on this slide, the IC will shut down the motor for a period of time when a lock is detected. The IC will continue cycling the motor until the rotor has been unlocked. Once the motor has been unlocked the IC will restart the motor and continue to operate normally.