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Snap Action, Limit Switches Application Field and Working Principle

Snap action, limit switches are common electromechanical components consisting of an actuator, a mechanical bracket and a contact. Basically, the switch works by activating the actuator, usually in the form of a plunger or lever, that then sets off a chain of events which modifies the contact base. Limit switches provide electrical detection of a physical movement or physical contact.

Application Field

Snap action, limit switches have many uses and can be used in a variety of applications and industrial processes. They are commonly used in automation and robotics, hence it is widely used in mechanical and electronic applications. Its uses are even more diverse in vehicle control systems, such as in speed limiters, ignition systems, and navigation systems. They are also widely used in domestic appliances and consumer electronics, such as washing machines, air conditioners, and other consumer electronics. Additionally, such switches are also found in HVAC systems, fire protection systems and in medical equipment. In some cases, these switches are even used in submarine applications.

Working Principle

The primary function of snap action, limit switch is to detect either an open or closed position. When the actuator is manually pushed to open the switch, the contacts open and break the connection, thus preventing any current from passing through and shutting off the equipment. On the other hand, when the actuator is manually pushed to close the switch, the contacts close and make the connection, thus allowing for current to flow and thus switching the equipment on. A single pole switch consists of a single set of contacts, while a double pole switch has two sets of contacts. Furthermore, there are also different types of trip mechanism, such as the snap action and lever rollover.

In a snap action switch, the plunger or lever is spring loaded and when activated by a current passes through the contact contacts, a mechanical motion occurs, and the attached bent arm will suddenly snap into the desired position. The contact base is then modified and the switch either opens or closes. In a lever rollover switch, the trip mechanism is activated by a lever that rolls over and causes the contacts to close or open. This type of switch typically has more contact points than a snap action switch.

Conclusion

Snap action, limit switches are essential components in any industrial, automotive and consumer electronics applications. These switches provide electrical detection of physical movements and contacts. They have many uses, such as vehicle control systems, HVAC systems and medical equipment. Furthermore, depending on the application, the switches work by opening or closing the contact base, either via a snap action or lever rollover. With their reliability and flexibility, snap action, limit switches are an invaluable component in today’s technology.

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