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Snap action, limit switches are one of the most common types of actuators. Their application field and working principle are well known to many users. The name “snap action" comes from the fact that they are capable of moving quickly and reliably, while still providing the user with the necessary accuracy.

Snap action switches are used in a variety of industries including aerospace, robotics, medical, food and beverage, and manufacturing. They can be used to trigger or monitor a machine or process, and in some cases can be used to inform a user of an unsafe condition.

These switches use a mechanism to hold their position until it is triggered. When activated, a rapid motion is produced, in response to either an external force or the application of a voltage. This mechanism is often referred to as a “snap action” because of the rapid response that occurs when the switch is triggered.

The most common type of snap action limit switch is the plunger type. Plunger-style snap action switches use a movable plunger, which is kept in place by a spring. When a force, voltage, or current is applied to the switch, the plunger snaps over, activating the limit switch and triggering a response such as a notification or change of position.

Another type of snap action, limit switch is the toggle. This is a mechanical switch, which is generally less expensive than plunger-style switches. When the switch is activated, the toggle snaps over and triggers a response.

Limit switches are also available in contact and non-contact configurations. Contact switches have contacts that are actuated when the switch is triggered, while non-contact switches use a magnetic field to detect the presence of an object.

Contact switches can be used in applications where the limit of travel needs to be accurately measured. They are ideal for triggering a response when an object approaches a specific position, or for monitoring an unexpected event.

Snap action, limit switches are typically used for automation applications, to monitor and control the motion of a machine or process. They are a reliable and cost-effective solution for many industrial applications.