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Snap action, limit switches are electromechanical devices which detect physical position, pressure or temperature in an electrical circuit. These devices generate an output signal in response to an input stimulus, such as a pressure or temperature change. As their names suggest, they are designed to function quickly, in a snap like fashion, when a certain position or pressure threshold is reached, thus providing ON/OFF controls and reliable performance over a wide range of input conditions.Snap action, limit switches are commonly used in industrial, consumer, medical and aerospace applications, and their use extends to applications as varied as medical imaging, retail information systems, radio frequency identification, RFID systems and telescopic whip antennas.The switch consists of a movable contact, fixed contact and actuating lever arm. The movable contact is a strip of metal (usually). It meets the fixed contact at a hinge. When the lever arm is actuated, the movable contact moves to make or break contact with the fixed contact, thus creating an either open or closed electrical circuit. The switch requires a certain amount of force or pressure to cause it to change position.These devices are generally very durable and can withstand repetitive usage over a long period. However, they do require periodic maintenance and inspection to ensure that they are functioning properly. Additionally, as with any electrical component, special care should be taken to ensure that the switches are not exposed to any type of liquid, high temperature or direct sunlight. Furthermore, extreme caution should be observed while handling the switches as static electricity discharge can cause permanent damage.The operation of snap action, limit switches can be further classified according to their various working principles. These include snap, snap-like, snap-actuated, latching, pressure and temperature.In a snap switch, the actuating lever is pushed forward until it snaps into a new position, causing a mechanical action which makes or breaks an electrical contact. In contrast, in a snap-actuated switch, the actuating lever is pushed forward, but the motion is arrested by a trip and the switch remains in that position until reset.A latching switch operates on a similar principle as the snap switch, but the lever is operated twice to cause the switch to pivot and change position. The first operation causes the switch to move and lock in position, and the second operation causes it to be reset.Pressure switches are used to detect changes in pressure, particularly in integrated systems that require monitoring. These switches detect changes in pressure, whether sudden or gradual, and signal an output signal to indicate the status of the system. Temperature switches detect and signal when temperature has reached or exceeded a preset level. These switches are used in a variety of applications, including environmental control systems, overheat protection systems and temperature sensing to regulate the output of a device. Snap action, limit switches are versatile and reliable components which are used in numerous applications. They are simple to install and maintain, and provide the necessary electrical contact closure in the form of either open or closed circuits. As such, they are an essential component of any electrical system and one that often goes unnoticed until there is a need for it.

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