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Snap action switches are one of the most durable, long lasting, and cost-effective methods of limit switch technology. Snap action switches, also known as momentary contact switches, are electromechanical devices used to control and regulate the flow of electrical currents from one circuit to another. In this article, we will discuss the application field and working principle of the snap action switch.

Application Field of Snap Action Switch

Snap action switches can be found in many common industries, from hand-held tools to industrial equipment. They are used to safely and reliably control power, closing and opening circuits to indicate on/off status. Common application fields for snap action switches include:

• Industrial Machinery and Equipment
• Electrical and Electronic Systems
• Appliance and Automation Controls
• Power Supplies, Generators, and Motors
• Lighting and Sound Systems
• Automotive and Other Transportation Systems
• Home and Office Appliances

Working Principle of Snap Action Switch

Snap action switches are actuated mechanically using either a spring-loaded, push-button, toggle, or rocker arm. When activated, the switch arm is pushed against a contact that closes the circuit. This type of switch is referred to as a single-pole single-throw (SPST) switch.

When the arm is not actuated, the contact remains open, thus breaking the circuit and preventing current from flowing. This type of switch is referred to as a single-pole double-throw (SPDT) switch. A double-pole single-throw (DPST) switch has two sets of contacts that can be closed simultaneously and a double-pole double-throw (DPDT) switch has four sets of contacts that can be closed simultaneously.

Snap action switches are designed to be extremely reliable, offering high current ratings, long life, and a positive-breaking action. This action, when the arm is pushed, causes the spring to snap and quickly break the contact, thus preventing any dangerous arcs that could potentially be created. This is how the snap action switch got its name.

Snap action switches are designed with several safety and protection features to help ensure a safer working environment. These features help to protect the device from overvoltages and destruction, as well as prevent sparks and fire. Some snap action switches also include a dust cover or pressure plate, which can be used to guard against accidental contact with the contacts.

Conclusion

Snap action switches are widely used in various fields, from hand-held tools to industrial equipment. They are designed for high current ratings, long life, and a positive-breaking action. Safety features such as dust covers and pressure plates are also included to help prevent accidents and injury. By understanding the application field and working principle of the snap action switch, you can better determine which type is best suited to your specific needs.

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