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Snap Action, Limit Switches

Snap action, limit switches are electronic devices used to detect and register the quick change in position and/or speed of a mechanism or system. They use sensors and microprocessors to measure, interpret, evaluate and control the motion of a mechanism or system. They are also known as contactor switches, latching switches, and limit switches.

A common application of a snap action, limit switch is in automation systems. When a motorized or hydraulically operated device reaches a certain limit in the travel of its actuator, a limit switch can be used to detect the limit and shut down the device. By placing limit switches along the path of travel of the actuator, a number of limit points can be detected and control of the device managed accordingly.

The external parts of a snap action, limit switch may be constructed from metal or plastic and are mounted on the adjustable frame of a machine or device. The internal parts are constructed from circuit boards, magnetic components, sensors and electronic controls. The sensors measure the distance and velocity of the actuator, and transmit this information to the microprocessor. The microprocessor interprets and evaluates the information, and then transmits this information to the control circuitry for processing.

The control circuit is responsible for making the appropriate adjustments to the operation of the device according to the requirements. For example, a limit switch can be used to deactivate a device when the predetermined limit is reached. The control circuit transmits the necessary signals to the device in order to shut it down. Additionally, the control circuit can be used to enable the device to continue its operation when the predetermined limit is reached.

In order to increase their reliability, many snap action, limit switches are provided with built-in safety features. These safety features include over-travel protection, under-voltage protection and back-up failure protection. The over-travel protection deactivates the device if the actuator exceeds the programmed limits. Under-voltage protection prevents the device from operating when the voltage is below a specified level. The back-up failure protection automatically operates the device if the primary limit switch fails.

Snap action, limit switches are used in a variety of applications including industrial machinery, robotics, motion detectors, safety systems, consumer electronics and agriculture. They are designed to provide reliable, accurate and consistent operation over a wide range of operating conditions. Their easy installation and the wide range of application options make them a popular choice for many different types of applications.

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