Push Buttons

Push Buttons Points : Push Buttons, Definition A Master switches; manually operated plunger or button for an electrical actuating device; assembled into push-button stations. Push buttons stations are spring controlled switches and when pushed,, are used to complete motor or motor control circuit. In fig symbols used in schematic drawings to represent push button contacts are shown.

The start button is a normally open type and pushes the button closes a circuit. The stop button is of the normally closed type and pushing the button opens a circuit. The colour of start push button is green and red for stop push button. In one push button, there are two sets of contacts are available, which are normally open and normally closed. In these push buttons, when ye press the push button, the N.O contacts become closed and N.C contacts becomes open, when we remove the finger on the button, the button goes back to its normal condition.

Now today some push buttons are available in market, in which a light indication is also available. When, we press this type of push button the lamp indicator is ON and when again, we press the button the indicator go back to its OFF position.