Working principle of micro switch

- Aug 28, 2018-

The micro switch is a kind of fast switch which is actuated by pressure, also known as the sensitive switch.

Its working principle is: the external mechanical force acts on the action spring through the transmission element, and accumulates the energy to the critical point, then produces the instantaneous action, so that the moving contact of the end of the action spring and the fixed contact can be quickly connected or disconnected. When the force on the drive element is removed, the action spring produces reverse action force. When the reverse stroke of the drive element reaches the action critical point of the spring, the reverse action is instantaneously completed. The micro switch has small contact distance, short action stroke, quick power and quick interruption. The moving speed of its moving contacts is independent of the speed of the transmission elements. The basic type of micro-switch is pin-press type. It can derive button short stroke, button large stroke, button extra-large stroke, roller button type, reed roller type, lever roller type, short arm type, long arm type and so on. Micro-switch is used in electronic equipment and other equipment for automatic control and safety protection of frequent switching circuit. Micro-switch is divided into large, medium, small, according to different needs can be waterproof type and ordinary type, the switch connects two lines for electrical, machinery and other power-on control, widely used in mouse, household appliances, industrial machinery, motorcycles and other places, the switch is small, but plays an irreplaceable role.