The momentary push button switch relies on an actuator, which is a device used to control a mechanism, in order to activate. The push button, or spring-operated actuator device for the momentary push-button switch, enables the switch to actuate while the button is depressed. Once the push button is released, the switch returns to its previous state.
Push-to-make switches, the most common type of momentary push-button switch, makes electrical contact, or switches on, while the button is depressed. The contact breaks upon release of the button. A push-to-make momentary push button switch, also referred to as a normally-open switch can take the form of the keys on a computer keyboard, which actuate while depressed.
A push-to-break type of momentary push-button switch, also known as a normally closed switch, makes electrical contact when the button is released and breaks contact upon depression of the button. A button pressed to open an electrically operated door is an example of a push-to-break momentary push-button switch.