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A snap action or limit switch is an electrical type of switch used to control the flow of current. It does this by opening and closing an electrical circuit in response to an actuating event. The event can be mechanical or electrical, but in all cases, the switch opens or closes in response to motion in one or two directions. Generally, snap action switches are designed for long term performance that is reliable and consistent in most types of environments.

Snap action switches operate on the principle of force and motion. An actuating force acts upon an element, such as a lever or a plunger, which is attached to a contact or sensing element. When the element moves to a certain point in its cycle, the contact will open or close. These switches are particularly useful when high levels of precision and repeatability are desired due to the predictable nature of the force-actuated action. It also generally guarantees that the switch will always reset to its original state when the actuating force is removed.

The main application of snap action switches is to detect and observe the presence of objects or products at a certain position. The switching action can be used to trigger an alarm or set signals, or to turn on or off a machine or controls. Snap action switches are commonly found in electronic items or kitchen appliances, controlling the power supply or signaling when something is ready. Some other common applications of snap action switches include control of motors and conveyor belts in factories, and security systems.

Snap action switches are designed with various levels of operate and release forces, as well as with various actuator or contact configurations, depending on their specific use. For example, silver-cadmium oxide snap action switches are preferred for high-current applications and for use in more corrosive conditions. The metal contacts are also often coated with a material that is resistant to corrosion to protect against environmental influences. Snap action switches also come in different shapes and sizes to match specific application needs.

Snap action switches are reliable and cost-effective, making them a popular choice in industrial and commercial applications. They are easy to install and maintain and have adjustable sets, making them highly adaptable to a variety of applications. The switches can also handle multiple sets, allowing for the use of multiple sets of contacts in a single switch.

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