The refrigerator door features a cylindrical, fan-shaped switch that primarily controls the interior light. This switch is typically located on the door frame and is activated when the door is opened or closed. When the door is opened, the cylindrical switch is pushed inward, completing the circuit and illuminating the fridge's interior. Conversely, closing the door releases the switch, breaking the circuit and turning off the light. The design ensures that the light only operates when needed, conserving energy. The switch is usually made of durable plastic and is designed for frequent use, providing a reliable and convenient way to enhance visibility inside the refrigerator.