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Snap action and limit switches are common and essential components of many automated systems. They are used in a wide range of applications, from precision medical instruments to heavy-duty industrial machinery. As the name implies, they activate when a specific limit is exceeded, serving as a switch or actuator.

The most common type of snap action and limit switches are mechanical. These switches are designed to detect and respond to quick, precise movements, such as those found in vehicular suspension, industrial production lines, and robotics. Some models of mechanical switches can even be triggered by fluid pressure or vibration, for a variety of applications. Because mechanical switches are relatively reliable and relatively low in cost, they are widely used.

In addition to mechanical switches, there are electro-mechanical and solid-state snap action and limit switches. Electro-mechanical switches are more complicated and, therefore, have higher costs than their mechanical counterparts. They convert an applied electrical signal into a mechanical action, which triggers the switching mechanism. Solid-state switches are completely electronic and are triggered by a change in circuit state rather than mechanical movement. These are generally more expensive than mechanical switches, but they offer a wealth of features, including improved repeatability and accuracy.

In most applications, snap action and limit switches must satisfy two basic criteria: they must reliably trigger when the specified limit is exceeded, and they must be able to handle the current the application demands. Depending on the application, the switch design may also need to account for environmental conditions, such as vibration, temperature, or moisture.

The two most common types of snap action and limit switches are actuating and non-actuating switches. Both are triggered by the movement of a limit, but actuating switches also allow for a hold-in feature, which activates the switch after the limit is exceeded and keeps it activated until the limit is released. Non-actuating switches are simpler, and are used for positioning applications where the switch needs to be switched on and off in quick succession.

Finally, there are a wide variety of specialty snap action and limit switches. These include limit switches for hazardous locations, pressure switches, and temperature switches. These are designed for more specific applications and have unique features that help ensure reliability and performance.

In summary, snap action and limit switches are two of the most commonly used types of switches in automated systems. They are often quite simple in design, but are also capable of providing reliable and accurate performance in many applications. Whether mechanical, electro-mechanical, or solid-state, these switches offer a great deal of flexibility and reliability.

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