This push button by Delock is ideal for installation in control panels, for example in industry, control or regulation technology. Push buttons can also be found in the automotive industry or the consumer sector. For example, as doorbells or triggers for lighting systems with timers such as those found in hallways. Button A so called button, or push button, returns to its initial position after being pressed. Opener and closer The NO (closer) contact establishes a connection between two contacts, while the NC (opener) contact releases them. Technical details