604EN224-2B

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Snap Action Limit Switches Application field and Working Principle

Snap action limit switches are electromechanical devices used in automated systems to monitor the position and/or motion of an actuator. They detect either the presence or absence of an object, depending on their position when the control circuit is deactivated. Snap action limit switches are commonly used in industrial processes, including CNC (computer numerical control) machines, robotics, and various types of automated assembly and packaging lines.A snap action limit switch can be used to detect the presence of an object on a machine, the position of a movable part, or the location of the switch relative to other components. When an actuator, such as a piston or rod, moves, the position of the switch is changed relative to the other components. This triggers the internal electrical contacts to make and/ or break, depending on the design of the switch. In such a way, limit switches provide an inexpensive way of monitoring the progress of a production line.Snap action limit switches make use of two basic components, a coil and an actuator. The coil is typically made from a sturdy wire or plastic, and encloses a small coil of wire that carries an electrical current. The current passes through the coil and causes it to become magnetized. When the coil is magnetized, an internal armature is drawn toward it, activating the switch.The actuator is a small component used to open or close the switch. When the actuator is pushed, it pushes the internal movable armature. This moves a curved contact bridge, located on the other side of the switch, away from a fixed contact. The contact bridge is then released and springs back into its original position, creating an electrical connection and closing the switch.In addition to their application in the industrial sector, snap action limit switches are also used in consumer products, such as Playstation controllers and remote control toys. Although their size may vary, they all essentially work in the same way – when a button or switch is pressed, the internal armature is forced away from the fixed contact and is returned by a spring. Snap action limit switches are typically enclosed in a sealed waterproof housing, making them safe for use in harsh environments, such as those with high temperatures and corrosive chemicals. They are also highly reliable, as their design ensures that the internal components are protected from outside elements.In conclusion, snap action limit switches are a useful and economical tool for controlling a variety of automated processes. By using the simple principle of magnetism and opposition, these switches detect and activate appropriate events, allowing for precise and efficient control of any system. And due to their sealed design, snap action limit switches are reliable and cost-effective, making them an essential component in any automated system.

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