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Snap Action, Limit Switches: Application Field and Working Principle

Snap Action, Limit Switches are a common type of electric switch. They are used in various fields such as instrumentation, industrial control and automation. This article will discuss the application fields and working principle of Snap Action, Limit Switches.

Application Field

Snap Action, Limit Switches are predominantly used for industrial control and automation applications. In this field, they are used to detect the presence of an object or to measure a particular parameter. For example, they are often used to control the operation of conveyor belts, automated assembly machines, robotic arms, etc. This type of switch is also used in the instrumentation field to measure temperature, pressure, flow and other physical phenomenon. In addition, Snap Action, Limit Switches can be used in domestic applications, such as controlling lights, door locks, and other household appliances. They are often used in boilers, fans and other home appliances that require the presence of a switch for control.

Working Principle

Snap Action, Limit Switches use a mechanical movement to make and break contact. When the switch is activated, the contact opens and closes, thus controlling the electrical circuit. This movement can be achieved through a variety of mechanisms such as a lever, plunger or a spring loaded mechanism. In order to make sure the switch is reliable, the contacts are usually made of solid metal materials such as copper or steel. The contacts in a Snap Action, Limit Switch can be designed to be normally closed (NC) or normally open (NO). The NO contact is open when the switch is not activated; whereas the NC contact is closed when the switch is not activated. The NC contact is generally used for safety applications, since it prevents any unexpected power surge from entering the circuit.

Conclusion

In conclusion, Snap Action, Limit Switches are widely used in industrial control and automation, instrumentation and domestic applications. These switches use a mechanical movement to make and break contact, with the contacts being normally open or normally closed. This makes them reliable, and highly suitable for applications that require safe and accurate control.

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