The push button is generally composed of cap, reset spring, bridge type moving contact,static contact,pillar connecting rod and shell.
The parting and closing state of the contact when the push button is not subjected to external force (that is, static) is divided into the start push button (that is, the normally ON push button), the OFF push button (that is, the normally OFF push button) and the composite push button (that is, the normally ON and normally OFF contacts are combined into one push button). For the start push button, the contact is closed when the push button cap is pressed, and the contact is automatically disconnected and reset after release; On the contrary, the OFF push button separates the contact when the push button is pressed, and the contact automatically closes and resets after it is released. The composite push button is that when the push button cap is pressed, the bridge type moving contact moves downward, so that the normally closed contact is first disconnected, and the normally open contact is only closed; When the push button cap is released, the normally open contact first breaks and resets, and the normally open contact then closes and resets.
