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Snap Action, Limit Switches or also known as cam switches, are electrical devices found in many items of industrial and electrical equipment. The switches themselves will take the form of a contact bar and they are designed to open and close circuits automatically when a certain force is applied. Generally, snap action, limit switches are used to either control the direction and travel of an object, or to protect operators and equipment from unexpected events.

Switches in this particular category are used as travel limit switches, overcurrent and temperature limiters, and overload protectors. The most common application is to control the travel of mechanical movements, such as linear actuators, rotary actuators and other mechanical joints. They can also be used to control the flow of fluids such as in pumps, valves, and compressors, as well as the levels of fluids. There are several different types of Snap Action, Limit Switches available, all with different principles for working including: single lever switches, two-lever switches, reversible switches and auxiliary switches.

Single lever switches are the simplest of the switches available and involve one lever or plunger which makes a connection when pushed. This switch is most commonly used to open and close circuits automatically when an item is moved in a particular direction. Two-lever switches are also quite common and are usually used in more complex applications. The two levers are used to open and close the circuit either simultaneously or alternatively, depending on the need. Reversible switches, as the name implies, are designed to open and close the circuit depending on the direction of travel. This type of switch is often used in motor control applications. Finally, auxiliary switches can be added to the systems to provide on/off control of other circuit functions.

The working principle of Snap Action, Limit Switches is based on the mechanical movement of the lever or plunger. Inside the switch, a spring is connected to the lever, which moves when triggered. As it moves, the spring is compressed and then released, pushing the lever down or pulling it up. This then creates a bridge between two contacts, thereby connecting or disconnecting the circuit. The force of the spring can be adjusted to suit the application.

Overall, Snap Action, Limit Switches are a type of industrial and electrical device which have many applications. They can be used to control the direction and travel of an item, or to protect operators and equipment from unexpected events. They are very easy to use and relatively inexpensive, making them a popular choice amongst many industries.

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