For years, new fans can be ruined with just a small mistake by plugging in the other way around.
Reverse Polarity Protection
Introducing the Intelligent range of fans, we have built in a revere polarity protection feature. The protection circuit will be able to withstand a short time of having the polarity reversed. This will give us enough time to correct the problem.
Dead-stop protection, in any case, if the fan blade is stopped by a foreign object, the circuit will not overload and burn out itself.