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Snap action, limit switches are primarily used in field applications where sudden physical movement or pressure needs to be monitored and where accurate, repeatable switching action is essential. Snap action switches achieve positive operation with the application of force to one relatively moving part.

Snap action switches deliver high performance and reliability across different applications, including automotive, household appliances, transportation, and healthcare. The high accuracy and durability allows for a long life, despite being exposed to shock, vibration and other environmental conditions. These switches typically provide a low power application with a typical rated voltage of 50V DC, 1A AC/DC.

The most common forms of snap action switch, the Microswitch and Limit switch, feature a push button and pressure-sensitive triggering mechanism. The Microswitch utilizes a plunger to activate a device when pressure is applied to the plunger, which then sends a signal to another device. This action allows for quick and accurate activation of a device or piece of equipment. Limit switches use a lever arm to press against a board or other surface when a certain amount of force is applied and then send a signal to another device. Microswitches and Limit switches are typically used in safety switches, such as machine or operation protective switches or control switches.

The operation of these switches is based on the principle of mechanical conversion. When an object or the basic push force moves, it will cause the disconnected switch contacts to come into contact with each other and establish an electrical connection between two points. The two sides of the switch contact are separated by a gap to reduce the possibility of false triggering. Depending on the type of switch, the contact gap can range from 0.2mm to 5mm.

Snap action switches are available in a variety of configurations and mounting styles, as well as different activator types such as levers, rollers, levers with rollers, and cross-actuator levers. They are also available in many contact materials and contact forms such as SPDT, DPDT, momentary or normally open, normally closed, and alternate open-closed. Depending on the specific requirements of the application, these switch can be custom designed or modified to ensure optimal performance.

In addition, snap action switches are becoming increasingly popular in smart systems, home automation, and the internet of things due to their reliable operation, high contact reliability and longevity, as well as their low power consumption and cost efficiency. With the increasing demand for fast and accurate control, snap action switches are becoming an essential part of many industrial automation systems.

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