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Snap action limit switches are among the most popular types of switches used in industrial and commercial applications. They have been designed to provide a quick and reliable method of activating a switch in response to a change in physical state, such as a change in temperature or pressure. The snap action limit switch is typically used in applications ranging from residential lighting control and heavy industry to specialist engineering applications such as automotive and aerospace.

Basic Working Principle

Snap action limit switches are typically constructed from a thin sheet of plastic or metal, with internal contacts being located inside an assembly. When the switch is touched by an external force, the contacts will close and the switch will activate or deactivate. The speed of the action depends on the design of the switch and the thickness of the material used. Generally speaking, a thicker material will require a longer time to “snap” back into place after a force has been applied. This is the basis of what is called the “snap action”.

Uses in industrial applications

Snap action limit switches have a wide range of uses in industrial applications. They are commonly used as an on/off switch in AC controlled motors and circuit breakers, and can also be used to detect the position of a moving part such as an elevator car, or to control the position of a machine’s mechanism. In automotive applications, limit switches are often used to control the speed at which an engine starts up or shuts down, or to detect the position of a vehicle’s seat. In laboratory and research work, snap action switches are used to activate test equipment and to record the progress of experiments. Lastly, snap action limit switches are also used in household applications such as lighting and appliance control, as well as in safety systems such as water heaters and furnaces.

Advantages

Snap action limit switches are preferred over other types of switches because they are inexpensive, easy to install and require minimal maintenance. They are typically small and light-weight, making them suitable for use in restricted spaces and can be easily integrated into existing systems. The design ensures that when a force is applied, the switch will respond quickly, which minimizes the risk of accidental activation or deactivation caused by mechanical vibrations.

Limitations

Although snap action limit switches offer many advantages, they have some drawbacks. For example, they are not designed to handle extreme temperatures or pressures, meaning they must be protected from such conditions. Additionally, the speed of the action means that it is not suitable for use in applications where accuracy and precision are required. Finally, due to their design, snap action limit switches require periodic cleaning and adjustment.

Conclusion

Overall, snap action limit switches are an effective and reliable solution for many industrial and commercial applications. By being able to respond quickly to a change in environment, they are able to provide a simple and cost-effective means of switching electrical currents on or off. Despite some limitations, these switches remain one of the most popular types of switches available, and continue to serve a vital role in many applications.

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