The Whirlpool WP3406108 Door Switch for Dryer helps ensure the dryer operates safely when the door is properly closed. This replacement switch detects the position of the dryer door and controls the electrical circuit that allows the appliance to run. When the door opens, the switch interrupts operation to help prevent the dryer from continuing to tumble. It is designed to restore proper door-switch functionality when the original component becomes worn, damaged, or fails to respond correctly. Replacing a faulty switch can help improve reliable dryer operation and provide an added level of safety during use.