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## Snap Action SwitchA snap action switch is an electromechanical device that is designed to open or close a circuit when a predetermined force or motion is sensed. The switch interacts with a magnetic field or pressure to trip the switch’s mechanism and create the desired effect. Some common types of this device are tactile switches, limit switches, and mercury switches.### Working PrincipleThe snap action switch is based on the principle of a simple mechanical lever. At the heart of the device is a lever arm that is held in place by a spring. Under varying degrees of pressure, the lever arm moves along its pivot point, causing either the opening or closing of the circuit.The amount of pressure needed to trip the switch’s mechanism is determined by the mechanism’s factory-defined settings. Usually, the lever arm must travel a certain distance along its pivot point or reach a certain amount of force before the switch is tripped.### ApplicationsThe snap action switch finds its application in many different industries, including automotive and machinery. Such switches are used to detect the presence of an object or measure the amount of pressure applied to a certain area, as well as to manually change a setting or cut off power when necessary.In the automotive industry, snap action switches are used in the assembly of automatic transmission systems and the manufacturing of radios and car alarms. They are also found in the computer industry, where they are used to detect the presence of the computer’s mouse or keyboard.In the machinery industry, snap action switches are used to detect the presence of metal objects in the industrial processes, as well as to control the pressure levels in pneumatic systems.In short, snap action switches are an essential part of any industrial or commercial application where reliable and accurate sensing and control is a must.## Limit SwitchesA limit switch is a type of switch that has two primary states: on and off. It is designed to open or close a circuit in response to the presence of an object or a predetermined force. The limit switch can range from simple push-button assortment to sophisticated sensors that detect the presence of an object on a conveyor belt.### Working Principle The way the limit switch works is simple. It operates using a number of contact elements and a spring arm. When the arm is pressed, the contact elements come together, opening or closing the electric circuit. The action of the switch depends on the predetermined force and the distance required to move the arm.### ApplicationsLimit switches have various applications in the industrial world, including the detection and positioning of objects on a conveyor belt or the opening and closing of a door. In the industrial automation sector, they are used to accurately measure the amount of force applied to the switch and to define certain stop points in the cycle of a machine. In addition, limit switches are used to detect the presence of an object in a machine, such as a metal object in a factory assembly line or a machine part in a conveyor system.In short, limit switches are an essential element in industrial automation as well as machine safety. They can be used to detect the presence of an object, measure force, and accurately detect when a machine needs to stop for adjustments or other reasons.