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Snap action, limit switches control on/off operations in large, industrial equipment in response to physical conditions. The normal operating principle of a snap action switch is based on a bimetallic strip through which electricity flows when a predetermined temperature is reached. The electrical contacts of the switch open and close depending on hot or cold temperatures. This helps to ensure a connection when a certain pressure, temperature, or other physical conditions are present.

The physical design of a snap action limit switch consists of a plunger or lever that is actuated by a physical contact. As the contact pushes against a lever or plunger, it creates pressure and displacement of the contacts within the switch which then creates an electrical signal. This type of switch is usually used in power control and process control applications.

Snap action swicthes have been used in a variety of applications such as automotive applications, data transmission systems, safety systems, security systems, and many more. An example of a use for a snap action switch is in a car when a front passenger airbag is activated. When the airbag is deployed, a switch senses the physical displacement of the airbag, and sends an electrical signal to shut off the airbag system.

Snap action switches are also used in industrial settings. For example, in manufacturing applications, snap action switches can be used to detect the presence of a physical object. When the physical object comes into contact with the switch, the electrical contacts open and close, sending an electrical signal to a control circuit.

In industrial settings snap action switches are often used in safety applications. For example, in a machine shop, snap action switches can be used to sense unsafe conditions such as the presence of sparks or hazardous gases. If a safety switch is triggered, an electrical signal is sent to a control circuit which can stop the machine or alert workers in the area.

Snap action switches are also used to detect and control temperature changes. In applications where temperature is a factor, such as laboratories or industrial ovens, a snap action switch can be used to detect a specific temperature range. If a temperature range is exceeded, an electrical signal is sent to a control circuit, stopping the operation or alerting the operator.

Overall, snap action switches are used for a variety of purposes in both consumer and industrial applications. They are useful for detecting and controlling physical conditions, and for providing safety and security measures.