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Snap action, limit switches are mechanical on/off switches, allowing machines to sense and respond to presence or motion. They are useful in a variety of applications, ranging from industrial automation to home appliances. Made of plastic or metal, they are typically mounted and actuated to engage or break electrical circuits.

The most common type of snap action switch is a momentary action device, which will stay in the "on" position as long as the force that actuates it is applied. When the force is removed, the switch will snap back to its "off" position. Momentary switches may be configured to enable actuation from different directions.

A fixed action switch is a more robust version of the snap action switch. It consists of two parts connected together by a spring that makes contact with a single pole. The spring is mounted on a permanent base and the other part is connected to an activating lever. When the lever is moved, the two parts make contact, actuating the switch that can then be turned on and off.

An important part of the most common type of limit switch is the plunger, which is used to actuate the switch with varying force. A plunger is a metal rod or pin that is connected to a lever or some other actuating mechanism. It is a spring-loaded device that, when activated, movement of the plunger will cause the switch to change its state. Machine operators have the ability to adjust the force applied to the switch via the plunger, allowing them to achieve the desired operating characteristics.

In addition to the plunger, many snap action limit switches include a lever that can be adjusted. Depending on the application, the adjustable lever can be used to adjust the positioning of the switch and the force applied to it. The lever can be set to engage the switch when it is in the "on" position, and this will cause the switch to go back to the "off" position when the lever is released.

Snap action, limit switches can be used for a variety of applications, such as controlling motors and other industrial equipment, activating solenoid valves, controlling and monitoring pressure, temperature and flow, and operating relays, pneumatic circuits and other control systems. They are extremely reliable and designed to operate in a wide range of environments, from low-temperature, high-humidity industrial environments to extremely cold, dry environments.

Most snap action limit switches have an adjustable on/off assembly and a built-in thermal overload protection. This feature ensures that the switch will not overheat or malfunction in extreme conditions. Thermal overload protection is especially useful in applications where the switch is exposed to high temperatures and the risk of damaging components or machinery is high.

Snap action switches are available in a wide range of sizes, shapes and configurations, and can be used for both low-voltage and low-current electrical circuits. They provide a cost-effective and reliable solution for controlling machines, providing long-term performance and reliability. These switches can handle a wide range of load types and are easy to install and maintain, making them a preferred choice for many industrial applications.

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