Push Button (mashroom type, flush type and projecting type)

The push button is mainly classified into two types depending on there function as :-

Normally closed push button.
Normally open push button.

As the name indicates the NO push buttons are Normally open, there is no any physical connection between moving and fixed contacts, and when pressed it becomes functionally closed. In case of NC push button, they are normally closed and when pressed they become functionally open.

depending on the appearance it is again classified as:-

Mushroom type push button.
flush type push button.
Projecting type push button.

Mushroom type push Button

Above fig. shows the mushroom type push button. here it consist various parts as Actuator, Mounting plate, Elements.

we can mount the NO or NC elements and Actuator to the mounting plate with the help of screws.

As in general practice Green colored actuators are used as indication of Start of process and Red colored actuator is used as indication of End of the process. Another important point related to the safety is, we mostly use the Normally Open hardware contact in start of the process and Normally Closed hardware contact for stop of the process.

Flush type push Button.

Above fig. shows the flush type push button.In this type of push button the actuator moves inside the cover of it, that's why it becomes the disadvantage where there is a dusty or oily operating condition, because of it there is a chances of actuator to get stuck and led to unwanted results.

Projecting type push Button

Above fig. shows the projecting type push button. In this kind of push button actuator are projecting out and there is no any cover over the actuator, so there is risk of damage due to physical accidents.

Note :-In modular type of push button we can add up to 6 Elements to single push button but in general two elements are used with single push button.

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