Industrial Electronics

Working principles of the microswitch

15 November 2021
Source: Electronics360 News Desk

A microswitch, also referred to as a miniature snap-action switch, is actuated by very little physical force through use of a tipping-point mechanism. A relatively small movement at the actuator button produces a relatively large movement at the electrical contacts, which occurs at high speed.

Such snap-action precision changeover switches have a very small contact gap. The snap-action defines a changeover switch whereby contact making and breaking speed is independent of the operating speed of the actuator.

When the plunger is in the released or rest position, the normally closed circuit can carry current and the normally open circuit is electrically insulated. When the plunger is depressed or switched, the normally closed circuit is open and the normally open circuit is closed.

These electric switches are deployed for automatic control and security protection in devices, which require frequent switching circuits. They are frequently utilized or door access control, HVAC applications, timer control in consumer appliances, elevators and industrial machinery.

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