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Snap action switches are a type of switch with a fast-acting mechanism that quickly returns to an original position after a wide range of applied forces. They can be grouped into two categories, depending on the switching element used: limit switches and snap action switches.Limit switches are a type of snap action switch that has a metal/plastic contact, which closes/opens when a physical motion is applied to a spring mechanism. When the motion is stopped, the metal/plastic contact returns to its original position. Limit switches are available in many styles, including metal/plastic, roller lever and plunge-actuated switches. Snap action switches are a type of snap action switch that uses a metal contact which is sealed with a rubber boot. When the moving object touches the metal contact, the switch snaps open and closes rapidly, creating an on/off effect in a very short period of time. Snap action switches can be used in a variety of applications, including position sensing, motor control and flow control. The application of snap action switches can be found in a variety of fields. In the medical field, snap action switches are often used in medical devices, such as syringes and pumps, to sense the amount of fluid inside the device. In the industrial field, the switches are used in automated machinery and sensors to detect the position of a moving object. The working principle behind a snap action switch is simple. When a force is applied to the switch, it will move quickly and snap back to its original position. This rapid motion is caused by the movement of a small spring inside the switch. When a force is applied to the switch, the spring is compressed and then released, creating the snap action. The amount of force required to move the switch depends on the type of switch and the materials used in its construction. Overall, snap action switches are a type of switch that quickly returns to its original position after a wide range of forces are applied. They are available in two main categories, limit switch and snap action switch, and can be used in many different fields, including the medical and industrial fields. Their working principle is fairly simple and can be explained by the movement of a small spring inside the switch being compressed and then released whenever a force is applied.