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Snap action is a type of switch design that employ a mechanical spring for its operation. It is based on a mechanism that causes a sudden and nearly instantaneous “snap” action when certain forces are applied on the switch, hence its name. It is widely used in limit switches, pressure switches, temperature switches, flow switches, and other sensors.

By definition, snap action is a switch which makes and breaks contact by the use of a mechanical spring. This spring compresses when an external force is applied on the switch, and its movement is reversed when the force is removed or lessened. This state change is abrupt and is referred to as a “snap” action, hence the name. This is different from the gradual change of a conventional switch, which requires a slower movement of the switch, giving it a softer “spring” action.

The applications of snap action switches typically involve sensing a physical limit or change in speed, pressure, temperature, or flow. Snap action switches are normally used for these applications due to their ability for instant detection and their robustness and reliability. For example, a limit switch is essentially a snap action switch that is used to detect the presence of a physical limit. In this case, when the switch reaches the physical limit, it provides a signal that is used to initiate a process. Similarly, a pressure switch is used to detect variations in pressure level and notify the user with an output signal.

The working principle of snap action switches is based on the mechanical spring mentioned earlier. When an external force is applied at the switch, the internal spring compresses and moves the switch to a different state. The force and movement of the switch is then reversed when the original force is increased or decreased, resulting in the snap action. This snap action is a result of the sudden compression and release of the spring, and it is used to initiate or provide an output signal.

Snap action switches also have a variety of advantages over other switch types. For example, they are excellent at detecting rapid changes in force or pressure, they often have large contact forces, they are capable of a wide range of temperatures, and they are relatively easy to maintain.

In conclusion, snap action switches are widely used in many industries in applications such as limit switches, pressure switches, temperature switches, and flow switches. They are based on a mechanical spring for their snap action operation, and their working principle is based on the compression and release of the spring. This snap action is used to detect and initiate a process, and snap action switches also have numerous advantages over other switch types.

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