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Snap Action, Limit Switches Application Field and Working Principle

Snap action switches are a type of limit switch that functions by rapidly snapping from one position to another, often referred to as a limit switch "flipping." This is a functional distinction from other types of limit switches, which typically offer slower, manual actuation. The main purpose of snap action switches is to open and close a circuit at a set point. This basic application is usually found in a wide variety of industries and equipment, but it can also be found in medical, automotive, and military applications.

Applications of Snap Action, Limit Switches

In industrial applications, snap action switches are used to regulate automated and robotic processes, as well as to provide interlocking solutions that allow operations and conveyors to run in a safe manner. In addition to industrial functions, snap action switches are also used to monitor and control the functioning of engines, fuel pumps, and other automotive components to ensure optimal performance. In addition, these switches are used in medical and military roles, where their rapid actuation time is beneficial for these types of applications.

Working Principle of Snap Action, Limit Switches

Snap action switches operate through a snap actuator, which is responsible for the rapid actuation of the switch. The actuator uses a lever-arm principle, with a coiled wire, spring, or other tension device providing the pressure necessary to force the actuation of the switch. When the lever arm is forced against the pressure of the coil, the switch actuates and closes or opens the circuit. This process is then repeated when the lever arm is released and the spring returns the lever arm to its original position.

In addition to the lever arm and coil system, snap action switches also use a variety of contact materials and styles for the contact points of the switch, such as gold or silver impregnated contacts, stainless steel contacts, and synthetic rubber contacts. Contacts that are gold or silver impregnated are usually used in applications where a low contact resistance or low-voltage operation is desired, while inherently low-voltage contacts offer greater protection from electrical interference.

Snap action switches are designed with a variety of physical parameters in mind, such as temperature range, actuation travel distance, operating force, and maximum current rating. Depending on the application, a snap action switch needs to be designed to meet a specific set of parameters. For example, a switch designed for outdoor applications will need to be built to withstand the effects of extreme temperatures, high humidity, and water submersion.

Conclusion

Snap action switches are limit switches that are designed for rapid actuation, which makes them well suited for a wide range of applications. Snap action switches operate by using a lever arm and coil system to actuate the switch, and a variety of contact materials and styles can be used for the contact points of the switch. These switches are designed with a variety of parameters in mind, such as temperature range, actuation travel distance, operating force, and maximum current rating. They are ideal for industrial, medical, automotive, and military applications.