Relays have many applications. They are frequently used to activate or switch on an electric circuit, but they are also used to control power circuits. Relays are widely found in various machines ranging from domestic appliances, automobiles, industrial control systems and electronic devices. These applications include motor controls for window lifts, automatic doors, household appliances including washing machines and dishwashers, HVAC equipment such as air conditioners, refrigerators (microwave ovens), dishwashers (upright freezers with integrated ice makers), but most commonly elevators and escalators.