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Push Button Switch (Momentary Push Button) A **push button switch** is a **momentary mechanical switch** used to manually open or close an electrical circuit when pressed. It is commonly used as a **user input device** in control panels, embedded systems, industrial automation, and electronic projects for functions such as **Start, Stop, Reset, Mode Selection, and Menu Navigation**. Push buttons are available in various colors for easy identification and are widely used with microcontrollers such as **Arduino, ESP32, STM32, and PLCs**.