A microswitch is a kind of switch with a small contact interval and a fast-moving mechanism, which operates with a specified stroke and a specified force and is covered with a housing and has a driving rod on the outside, because the contact distance of the switch is relatively small, the name micro-switch, also known as sensitive switch. Also known as sensitive switch, quick-acting switch. Quick switch for pressure actuation. The working principle of the door switch in the anti-theft system is that the external mechanical force acts on the action spring through the driving elements (push the pin, the button, the lever, the roller, etc.) . When the action spring moves to the critical point, the instantaneous action is produced, the moving contact at the end of the action spring is quickly connected or disconnected from the fixed contact. When the force on the transmission element is removed, the action spring produces the reverse action force, and when the reverse stroke of the transmission element reaches the action critical point of the spring, the reverse action is completed instantaneously. The contact distance of the micro-switch is small, the action stroke is short, the power is small and the switch is on and off quickly. The action speed of the moving contact is independent of the action speed of the driving element.