May bee a bit off topic here but one thing I dislike about Thermal cut outs is that They tend to only switch the motor off when the motor has already overheated. You then get Heat sink were although the motor is off it is now red hot and has no way but heat dissipation to cool it down often causing damage that may not show straight away but will shorten the life of the motor. Running a motor that has overheated ( once clear ) is a far better way to cool it down to operating temp. On some big heavy duty Nilfisk vacuums the machine would open a trap door allowing the motor to run and cool down if the blockage was not removed