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Snap Action, Limit Switches and their Application Field and Working Principle

Snap Action and Limit Switches are vital components in industrial engineering processes and most manufacturing operations. They are used to carry out the basic functions of detecting the position, direction and number of rotations of machinery components, as well as signalling when a predetermined limit or threshold has been reached. This can range from the simplest of functions such as detecting the presence or absence of a part, to more complex functions such as speed monitoring, temperature control and other process measurements. Snap Action and Limit Switches offer reliable operation, wide application range, housings that meet IP standards, low power consumption and they are robust and virtually maintenance free.

Application Field of Snap Action and Limit Switches

Snap Action and Limit Switches are used in numerous applications such as in industrial machinery and process automation, residential and commercial appliances, thermostats, alarms and safety systems, and other climate control systems. In the industrial machinery field, the switches are used for monitoring the position and rotation of machinery components, motion, speed and other process measurements. They can also be used for signaling when a predetermined limit or threshold has been reached.

In residential and commercial appliances, the switches are used for such safety and convenience features as an oven timer, ice maker in a refrigerator, and range limiters. These switches play an important role in residential and commercial appliances by providing safety features when operating these devices and ensuring that the appliance will shut off when a predetermined limit is reached. In thermostats, the switches are used for controlling and monitoring the temperature of an area or room. In alarm and safety systems, the switches are used for detecting the presence or absence of an object, as well as signaling when a predetermined limit or threshold has been reached.

Working Principle of Snap Action and Limit Switches

Snap Action and Limit Switches are based on a mechanical approach to take measurements and they work on the principles of variation in the switch\'s resistance. When the switch contact is lifted or racked, the contact resistance changes. This change in contact resistance can be measured electrically, which triggers an action determined by the user.

The main difference between a snap action and a limit switch is in the way that the switch contacts open. In snap action switches, the movement of the switch arm is spring loaded and opens the contacts abruptly when a predetermined force is applied. The switch arm is usually a small plastic bar with a break point which will snap apart when the predetermined force is applied. In limit switches, the movement of the switch arm is usually initiated by the user and the contact opens slowly according to the speed with which the user moves the switch arm.

Snap Action and Limit Switches have a variety of applications and are used in many industries to provide reliable measurements of the position, speed and other process measurements. Their versatile design and reliable operation makes them an ideal choice for a wide range of applications.

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