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Snap action, limit switches are electromechanical devices often used to detect the presence or absence of objects or to prevent overloads in machinery. Often referred to as limit switches, they can be used to turn off machinery if its speed is too high, or to cut electricity if a machine has exceeded its operating range. Snap action limit switches can also be used as safety devices, preventing workers from operating machines when necessary safety guards are not in place.

The first type of snap-action limit switch is the direct-acting type. The direct-acting type works by activating a switch when the object it is detecting (known as the target) enters the detection area. The switch is activated when a magnet or metal object is brought within a certain distance of the sensor. This type of switch is ideal for applications where the proximity of the target is constant.

The second type of snap-action limit switch is a lever-operated switch. Lever-operated switches are used in a variety of applications, but are most often used as pressure switches. This type of switch is activated when a set pressure is applied to the lever. A common application for this type of switch is a vending machine where the switch detects the presence of a can or bottle, and when it is removed, the vending machine will dispense another can or bottle.

The third type of limit switch is a reed type switch. Reed type switches are generally used in applications where the target needs to be detected for a short period of time. Reed type switches detect the presence of a magnetic field and when the field is detected, the switch is activated. This type of switch is most commonly used in proximity sensing applications, such as security or access control systems.

The fourth type of limit switch is the mercury-wetted switch. Mercury-wetted switches are typically used in applications where the wetted material is needed to sense the presence of the target. This type of switch is activated when the mercury level reaches a certain height. The most common applications for this type switch are in water pumps, pressure vessels, and other environments where liquids are used.

The final type of snap-action limit switch is the mechanical type switch. Mechanical type switches are most commonly used when the target needs to be detected at a very precise point in time. This type of switch is activated when the lever is moved to a certain position. Common applications for this type of switch include door locks, control panels and safety devices.

Snap action limit switches can be used in a wide variety of applications and are designed to detect the presence or absence of objects in a dependable and reliable way. They can be used to prevent overloads in machinery, to detect the presence of objects, and as safety devices. Snap action limit switches are available in a wide range of styles, configurations, and sizes and can be used to detect and control a variety of different functions.

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