Thank you for this tip; it saved me a service call and buying a new dryer.
I will note for the world, though, that the reason mine tripped is because I washed the lint filter in water and put it back into the machine wet. One would think that the dryer would dry the screen, but the water blocked the air flow and allowed the dryer to overheat with lots of acrid black smoke exiting the dryer once I opened the door.
I've reset the switch and used the dryer several times -- all seems well, but DO NOT insert a WET lint screen back into the the machine!!
Greg
August 2014