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Snap action limit switches are devices with a mechanical operator that, when triggered, provides a positive and repeatable electrical response. These switches are used in a variety of applications, including safety systems, security, industrial automation, retail and data collection, among other fields. Snap action switches are commonly referred to as “limit” switches because they are designed to be used in end-of-travel positions – imaging the switch being in a “limit” to the motion of an object. They work by using a mechanical actuator to cause a physical movement. When the actuator contacts the switch’s internal electrical contacts, the switch is triggered.

This type of switch is available in a variety of electrical specifications and contacts configurations, making them highly versatile. Snap action limit switches can have either single or multiple contacts and can either be momentary or latching. They are typically rated up to 16A with a voltage of 250VAC or 30 VDC, but more robust models may be available. Snap action limit switches are typically rated for 10 million mechanical operations and vary in contact material and various environmental protections, making them suitable for a variety of applications.

Their simplistic design allows them to be used in environments with a wide range of temperatures. By design, the snap action limit switch has two distinct operations: ‘actuated’ and ‘unactuated’. The ‘unactuated’ position is the resting position of the switch and the ‘actuated’ position is when the switch has been activated. This type of switch is often used to indicate when an object has reached the end of its range of motion and is often found in the agriculture, medical, railroad, vending and entertainment industries.

The most common type of snap action limit switch is the plunger switch. In this type of switch, a spring-loaded plunger is actuated when the object or component it is sensing comes in contact with it. When the plunger is actuated, the mechanical movement causes a metallic contact to close and completes the electrical circuit. This type of switch is usually polarised so that it only senses motion in one direction. In addition to plunger switches, rocker, lever, rotary and roller plunger switches are also available.

In addition to its industrial use, snap action limit switches can also be used in consumer applications. Home appliances and electronics often use snap action limit switches in order to detect the end of travel position. For example, a dishwasher may use a snap action limit switch to detect when its cycle has been completed. In addition to its use in home appliances, snap action limit switches are also used in medical devices, automotive and robotics.

Snap action limit switches are fairly inexpensive and easy to use, making them an attractive option for many companies and consumers. They are dependable, reliable and have a long life expectancy, making them an attractive option for a variety of applications. They are commonly used in safety systems, commercial applications, industrial automation, data collection and more.