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Snap-action limit switches are a type of limit switch that uses snap action to quickly move from one state to another. They are used in numerous applications ranging from simple devices such as thermostats and time clocks, to more complex systems such as process failure protection and automation. This article will provide an overview of their application and working principles.

Application

Snap action limit switches are highly versatile, making them suitable for a wide range of applications. Some of the more common applications include industrial controls, process control, consumer electronics, and home automation.

In industrial and process applications, they are used to monitor and control the movement of objects and materials. For example, they can be used to detect when a conveyor belt has stopped running, or to detect when a motor has reached a certain speed. They can also be used to control the movement and positioning of industrial machinery.

In consumer electronics, snap-action limit switches are often used to detect the position of various components in an electronic device such as a TV or laptop. For example, they may be used to detect when the lid of a laptop is opened or closed. In home automation, they may be used to control lights, shutters, blinds and other devices.

Working Principle

The working principle of a snap-action limit switch is relatively straightforward. The basic components of a snap-action limit switch include a contact, a plunger, and a spring. When the contact is activated, the plunger is pushed against the spring, creating a snap action which causes the switch to move into either the normally open or normally closed state.

In normally open applications, a current flows through the circuit when the contact is activated and the plunger is pushed against the spring. When the contact is released, the plunger is released and the switch returns to its normally open state, interrupting the current flow.

In normally closed applications, a current does not flow through the circuit when the contact is activated and the plunger is pushed against the spring. When the contact is released, the plunger is released and the switch returns to its normally closed state, allowing the current to flow through the circuit.

The snap-action limit switch is a reliable and extremely durable component, capable of withstanding even the harshest industrial environments. They are also very cost effective, making them an ideal choice for many applications.

Conclusion

Snap-action limit switches are an invaluable tool for controlling and monitoring a broad range of applications. They are highly durable, cost-effective, and reliable, making them an ideal component for many industrial, process, consumer electronics, and home automation applications. Knowing the working principles and applications of a snap-action limit switch can help in selecting an appropriate component for a particular application.

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