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Snap Action, Limit Switches - Application Field and Working Principle

Snap action limit switches are some of the most versatile devices in the machine automation and industrial control world. They are used to control devices such as electric motors, pumps, and actuators.

A limit switch is a mechanical device that detects a physical location or position. The switch can be preset to \'trip\' or activate when a certain position is reached. When the switch \'trips\', it opens a circuit or activates an electrical device. Limit switches use a variety of sensing elements including cam-operated switches, slip-ring assemblies, tie rod assemblies, and limit switches.

Limit switches can be used in applications in a wide variety of industries, including automotive, aerospace, manufacturing, printing, packaging, medical, and many more. Limit switches are found in practically all industrial operations, from conveyor systems to process equipment.

Applications of Snap Action Limit Switches

Snap action limit switches are used in various applications including:

• Automation - limit switches are frequently used in robotic systems and automated machines. They can be used to detect the presence of a part, the movement of a part, or the position of a part.
• Sensors - limit switches can be used to detect the position of a machine component such as a door or a valve. Limit switches are often used in safety systems as well, to detect potential hazardous conditions.
• Control - limit switches can be used as part of a control system. They can be configured to control motors, actuators, pumps, and other devices.

Working Principle of Snap Action Limit Switches

A limit switch is made up of several components. The most important component of a limit switch is the contact block which comprises the "snap action" or tripping mechanism. The contact block contains two metal plates or contacts, which are connected to a spring. The spring is designed to provide the "snap action" when the limit switch is triggered.

When the switch is set, the contact block is in a stable position. When a limit is reached, the contact block will move, causing the contacts to close. The movement of the contacts triggers the "snap action" which opens or closes the circuit or activates an electrical device.

The contacts in the contact block are energized when the limit switch is triggered. This energizing of the contacts is known as a "break" in electrical terminology. When this break occurs, a signal is sent from the contact block to the controller, telling it that a limit has been reached and that an action should be taken.

Conclusion

Snap action limit switches are extremely versatile and reliable devices that can be used in countless applications, from automation and control to sensing and safety. With their many different components and applications, limit switches are essential to any industrial process, from the smallest operation to the most complex. They are an essential component of any system that requires the detection of physical location or position.

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