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Snap Action, Limit Switches

Snap action limit switches are widely used in all sorts of automation control applications. They are small, robust and reliable electromechanical devices which provide user-defined feedback. They have a simple design, often consisting of an actuator, a moving element and a contact point. The actuator triggers the contact point whenever it is activated, thereby causing a signal to be generated. The contact point is typically a metal disk or a rectangular block that contains the contact point, in a low-profile enclosure. As the actuator activates the contact point, it sends an electrical signal along a line to the controlling device.

The snap action limit switch consists of two parts; the switch and the actuator. Depending on the type of switch, the actuator may be manually activated or operated by a pneumatic or hydraulic system. The switch must be able to detect the presence of the contact point and to provide a dial high/low signal to the controlling device. An electronic signal is sent to the controlling device when the contact point is tripped.

The design of the snap action limit switch allows it to be used in a wide range of applications. This includes machines, such as conveyor systems, index drives, pressure sensors and safety mechanisms. They can also be used for actuators, such as those controlling solenoid valves and motors.

Snap action limit switches are very versatile, allowing the user to customize their settings in order to suit their specific needs. Depending on the type of switch, the contact points can be configured to be closed when tripped, re-closed after being tripped, or remain open when tripped. The re-closure mode is useful when the contact point needs to be monitored for a specific length of time, such as for safety reasons. Additionally, the switch can be designed to be continuous or intermittent, which determines the amount of time the contact point is open after being tripped.

At the heart of snap action limit switches is their working principle. A simple electrical circuit is formed when the contact points are tripped, causing an electronic signal to be generated. The signal is then sent along a line to the controlling device. Depending on the model, the signal may be either a continuous or an intermittent signal. Continuous signals provide constant feedback to the controlling device while intermittent signals provide short bursts of output every time the contact point is tripped.

In summary, snap action limit switches are useful in a wide range of applications. They are small and reliable, and can be easily configured to provide user-defined feedback to the controlling device. The working principle of these switches is very simple, relying on electric circuits and the contact point being tripped to provide an electronic signal.