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Snap Action, Limit Switches

Snap action switches provide a user with the ability to switch between two states: ON and OFF. This type of switch takes advantage of a unique “snap” design that when triggered quickly and accurately switches between the two states in a reliable and repeatable manner. Typically this type of switch is used for control purposes, and frequently it is used as a limit switch or in safety-related applications.

Applications of Snap Action Switches

In many cases, snap action switches are used for controlling the actions of machines such as industrial printers, escalators, and other machinery. These switches act as limit switches in order to regulate the actions of complex machinery, and in some cases to prevent injury or equipment damage. In other cases, snap action switches are used in the home for controlling lights and electric appliances. In the automotive industry, snap action switches are used to control electric windows, locks, and numerous other safety features.

Working Principle of Snaps Action Switches

In order to understand the working principle of a snap action switch, it is important to look at the internal components of the switch. The main components of a snap action switch include a small metal lever; a contact which allows current to flow; and a spring-loaded actuator which uses the metal lever to switch the contact between open and closed positions. When the metal lever is pressed, the actuator causes the contact to open, thus breaking the current from passing through. Once the user releases the lever, the actuator closes, allowing the current to pass through again.

The spring-loaded actuator is a key element of the snap action switch. This actuator uses a spring to remain in the open position, meaning that the switch is “off” when no current is flowing. When the metal lever is pressed, the spring is pushed against the contact and it bounces back. This causes the contact to abruptly and accurately switch between open and closed positions, thus allowing the user to control the current.

Conclusion

Snap action switches are a versatile and reliable type of switch that are used to controlling the actions of machines, in the home and in the automotive industry. The unique “snap” design of snap action switches enables them to switch between open and closed positions quickly and accurately, and they are often used as a limit switch in order to regulate the actions of complex machinery. The working principle of snap action switches involves a metal lever and spring-loaded actuator which allows the switch to quickly control the current that passes through it.

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