There is a thermal fuse inside the dryer usually located behind the back cover on the upper part of the combustion chamber. When this fuse "blows" it turns off power to the whole dryer. This keeps your house from burning to the grown, and you from dying. The fuse "blows" for a reason, most likely to is lint build-up in the dryer and/or dryer vent system. The good new it only cost a few dollars to get a new one. The bad news is you need to find out why it "blew", the dryer got to hot for a reason.