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Snap action, limit switches are electrical switching devices. They are used to sense the presence or absence of an object, machine part position, or limit of travel. When actuated, they switch on or off a circuit to a load, such as a motor or solenoid, that is controlled by the switch.

Snap action switches are usually used for specific jobs such as door interlock, hand-held tool switch, and pressure regulator switch. Commonly found in amusement parks, factories, or commercial buildings, snap-action switches are designed to turn on or off an electrical circuit when a specific threshold of pressure is reached from an external force.

Snap action, limit switches consist of a button, also known as actuator, a spring-loaded mechanism, an electrical contact, and a housing. When the button is pressed, it actuates the switch. This causes the electrical contact to make and break producing an electrical pulse. The button is released and the snap action spring mechanism brings the switch back to its original position.

One of the most popular designs of the snap action switch is the toggle switch. A toggle switch consists of a toggle mechanism and an actuator. When the actuator is pushed in, a force is applied to the toggle which causes it to move freely to an OFF or ON position. The switch will remain in that position until the user pushes the actuator again, at which point the toggle will snap back to the original position.

Another type of snap action switch is the roller switch. This type of switch uses a roller instead of a toggle to actuate the switch. When the roller is pressed, it actuates the switch. The electrical contact will make and break producing an electrical pulse. The roller is released and the switch is returned to its original position.

Another type of snap-action limit switches is referred to as the mercury switch. This type of switch is designed to sense a liquid, typically mercury, and actuates the switch when a certain level is reached. A mercury switch consists of a bulb containing a liquid, a vent, a diaphragm, and two electrical contacts. When the liquid level rises and passes the vent, the diaphragm will be pushed inward, causing the two electrical contacts to make contact.

Snap action switches are used in a wide range of applications including automotive switches, door interlocks, appliance switches, and machine tools. They are also widely used in security systems to detect the presence of an intruder or unauthorized access.

These switches are often found in industrial settings, such as manufacturing plants or factories, where they are used to automate processes and control equipment. Snap-action switches are also used in medical and laboratory equipment, as well as consumer applications such as doorbells and alarms.

The use and application of snap action switches varies widely, but their basic operation remains the same. When pressure or motion is applied to them, the switch will actuate and make the contact, creating an electrical pulse which can be used to power, control, or actuate equipment.