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A push button switch is an electrical switch that is activated by pressing. A push button may be a selector switch, an emergency stop switch, a key operated switch, a flush pushbutton, a mushroom stop switch, among others. Push button switches may be momentary or maintained operation. A momentary push button stays activated for only as long as it is pressed. A push on push off switch has a maintained operation. Push buttons used as panel test lights have a bulb in them that illuminates under test conditions. The pushbutton makes or breaks electrical contacts that may be normally open or normally closed. A small push button allows a more condensed switch button configuration.
When choosing a push button switch, consider the environment the switch will operate in and the required functionality. A push button may be corrosion and weather resistant for use in harsh conditions, where materials such as stainless steel may be important. The push switch may need to be momentary for use in an application such as a buzzer. A push button on off switch may be more appropriate for lighting applications. There are a variety of mounting options that a pushbutton may use, such as threaded bodies with locking nuts.