This thermal cut-off prevents the dryer from overheating when the dryer high limit thermostat fails in a closed circuit condition. Silver Approximately 2 inches long and 1.5 inches wide each Metal Dryer Thermal Cut-Off Fuse Kit, Dryer Thermal Cut-Off Kit. Includes one high-limit thermostat with a limit of 250 degrees Fahrenheit, and one thermal cut-off fuse (309 degrees), jumper wires, and new female spade terminals Both components are mounted on the heater housing.