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Snap Action, Limit Switches

Snap action and limit switches are devices that play a vital role in different parts of modern life, providing proven security and safety. We rely on them for safety systems, flotation systems, elevator services, and even run-of-the-mill everyday automatic doors. It would be impossible to imagine any kind of sophisticated human activity without them. Thus, gaining an understanding of their working principle and application fields has become essential. To achieve that, it is important to have some basic knowledge of the fundamental basic elements of any particular switch. One of the most important parameters is the travel, also known as the stroke, which determines the displacement of the switch as it changes state. In addition to this, other parameters include contact material, contact type, protective ratings, and application voltage. All of these must be chosen carefully depending on the specific intended use.When discussing snap action and limit switches, it is necessary to distinguish between the two. On the one hand, snap action switches can be defined as switches that actuate the contacts when the force applied is changed from one direction to another. The switch typically includes a flexible blade, which can contact two or more stationary contacts under the effect of an external force. On the other hand, limit switches are mechanical devices that consist of an arm that can rotate in one or two axis, typically controlling some actuator. The switch’s setting determines the position of the actuator. In terms of application fields, snap action and limit switches can be used in any kind of system where reliability, precision and secure operation is needed. For example, snap action switches can be found in a range of different home and commercial products, including vehicle sensors, ventilation systems and security switches. On the other hand, limit switches are incredibly versatile and can be implemented in motor control, medical equipment and hydraulic systems, among many other applications. In terms of working principle, snap action and limit switches work in quite different ways. Snap action switches are usually composed of a simple, piston-like actuator, which can open and close the contact according to the direction of the external force. In contrast, limit switches drive the mechanism with a simple arrangement of actuating rods. When the switch is operated, the rods are set in motion, allowing the contacts to either open or close.Finally, it is important to note that the working principle of these two switch types may be slightly different, but the basic principles of operation remain the same. In both cases, the switches react to specified external forces, and the design of the moving element will determine whether the switch will actuate in one or both directions.

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