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Snap action, limit switches are types of sensors that are commonly used in a wide variety of applications. These type of sensors are designed to detect a predetermined position or force, or quickly detect changes in position or force. When a predetermined limit or means is reached or exceeded, the limit switch will activate or open a circuit. When the limit or means is met or exceeded, the switch will deactivate or close the circuit.

A limit switch is composed of a variety of parts such as an actuator, a base, a contacts, terminals, plunger, and mounting holes. The plunger is spring-loaded and when the limit is reached, the plunger retracts and causes the switch to either activate or deactivate a circuit. The actuating force of the switch can range from as little as 1 oz-in to as much as 100 lb-in. The actuator can be either an external or internal force. Examples of external forces are push buttons, levers, and foot operated pedals. Examples of internal forces are cam operated devices, limit switches, and cams that use cams for their actuating force.

The applications for limit switches are vast and include machine automation, control systems, security applications, and test and measurement applications. To name a few, limit switches are commonly used in automotive vehicles to detect pressure differences, in robotics to detect position, in security systems to detect locked or unlocked doors and other hazards, and in home users to detect motion.

There are three main categories of limit switch technology: mechanical, electrical, and optical. Mechanical limit switches may be either a rotary or linear type. In a rotary type, a limit switch is placed on a turning shaft and is activated as the shaft turns. In a linear type, a limit switch is placed on a moving track and is activated as the track moves along its length. Electrical limit switches work similarly to mechanical limit switches, but instead of a physical switch, an electrical switch is used.

Optical limit switches are similar to electrical limit switches, but instead of an electrical switch, a light based circuit is used. This type of limit switch is often used in hostile environments, where dust and other particles in the air might affect the accuracy of the switch. Optical limit switches are more expensive than other types, but the increase in accuracy is worth the additional cost.

Overall, snap action limit switches are a versatile and reliable sensing technology that sees use in a variety of industries, applications, and environments. Their ability to accurately detect a predetermined position or force, or quickly detect changes in position or force proves invaluable in many applications. They are a cost effective choice for those looking for an easy and reliable way to sense and control a process.