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Snap action switches, more commonly known as limit switches, are a type of mechanical switch that is actuated when a physical object makes contact with the switch. Snap actuation is a type of mechanical actuation that involves a lever and plunger working together to create an electrical connection between two contacts when the lever is pressed. This type of switch is used in various industrial and consumer applications, such as automotive, elevators, and machinery.

The working principle of a snap action switch is simple yet effective. The device consists of two contacts, typically a metal plunger and a lever that are connected by a spring. When the plunger is pressed, it causes the lever to move, and the contacts close, thus forming an electrical connection. These switches typically have a low current rating of 2-10 amps, making them suitable for small- and medium-power applications.

Snap action switches are typically used in applications where a high-speed response is required. When the plunger is depressed, the contacts close quickly, typically within a few milliseconds. This makes them ideal for applications that involve high-speed machinery, such as elevators, conveyor belts, and machine tools. They are also used in automotive applications, such as power doorlocks and window lifts.

Snap action switches can be operated manually or automatically. Manual switches are operated by the user, while automatic switches are triggered when the actuator reaches a predetermined position. Both manual and automatic switches are available in a wide variety of design configurations, with both mechanical and electrical outputs.

Limit switches are also commonly used in many household and industrial applications. These switches are used to create an electrical circuit when a user moves an actuator to a predetermined position. These switches can either be normally closed, or normally open, depending on the application. In a normally closed switch, the contacts are closed until the actuator is moved, while in a normally open switch, the contacts are open until the actuator is moved. Limit switches are commonly used in industrial machinery and robotics.

In conclusion, snap action and limit switches are versatile devices that serve a variety of applications. By quickly actuating electrical connections, these switches are essential components in many industrial and consumer applications. They are actuated by mechanical, electrical, and pneumatic inputs and have both manual and automatic operations for flexible control.

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