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Snap action and limit switches are switches used in a variety of applications in industrial settings. The "snap-action" in their name refers to the mechanism of the contact points snapping open and closed when activated, creating a temporary break in the circuit. The contact points of the limit switch then close, completing the circuit again. This type of switch is frequently used to automate processes and guard against overloads.

The application of snap action and limit switches is quite diverse. Industrial applications often include controlling relays, providing a signal when a process is complete, or timing a specified period of time. These switches have been used to control a variety of automated systems, such as solenoids and motors.

One of the most common applications of snap action switches is in the protection of motors from overload. This type of switch is activated by the force of the overload, and the contact points close when a predetermined level of overload is reached, which protects the motor from damage.

Snap action switches are also frequently used in safety applications, and can be used to detect a trip wire or an object in the way of a process. These switches can be used to stop the process if an object is in the way, providing an extra level of safety in industrial applications.

Another application of snap action switches is in the protection of sensitive electronic devices, allowing them to be protected from over current, over voltage, and short-circuit conditions. These switches are often built into power supplies, allowing them to be shut off if an over current or over voltage condition is detected.

The working principle behind snap action switches is relatively simple. These switches are typically made up of two contact points, which are connected to a coil spring. When the switch is triggered, the contacts are separated, breaking the circuit. When the switch is reset, the contacts are brought back together, completing the circuit again.

These switches can be configured to operate in a variety of ways, such as normally open/normally closed, normally open/normally open, or normally closed/normally open. This allows the switch to be adapted to different applications and different levels of force.

Snap action and limit switches are useful in a variety of industrial applications and provide a reliable way to control automated processes. They can be used to protect electronic devices, guard against overloads, and provide a signal when a process is complete. These switches are relatively simple in design, but incredibly useful in a wide range of applications.

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