Micro switch is a contact mechanism with a tiny contact interval and snap action mechanism, with a specified travel and specified force for switching action, covered by a shell, its external drive lever of a switch, because of its switch contact interval is relatively small, so the name of the micro switch, also known as sensitive switch. The electrical symbol is SM.
The external mechanical force is applied to the action reed through the driving element (push pin, button, lever, roller, etc.), and when the action reed is displaced to the critical point, it produces instantaneous action, so that the dynamic contact at the end of the action reed is quickly connected or disconnected with the fixed contact.
When the force on the actuator element is removed, the action reed generates a reverse action force, and when the reverse travel of the actuator element reaches the action threshold of the reed, the reverse action is completed instantaneously. The contact pitch of the micro switch is small, the action travel is short, the pressing force is small, and the on-off is rapid. The action speed of its movable contact is independent of the action speed of the transmission element.