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Snap action and limit switches are a type of electrical switch that is designed to perform many different functions. It consists of a set of two electrical contacts that are usually placed in the form of a button, lever, or other mechanical actuator. When a specific force is applied to the switch, it will cause the electrical contacts to snap open, making an electrical connection that is used to control an electrical device. In addition to their electrical functions, these switches can also provide physical protection by preventing the operator from accidentally touching live electrical components.

The most common application of snap action and limit switches is in the area of home security systems. They are typically used to trigger alarms when a certain threshold of motion or a certain temperature is detected. They are also widely used in automobile ignition control systems, lighting controls, and medical devices. Additionally, these switches are sometimes incorporated into circuit boards as part of a circuit protection application.

The working principle of snap action and limit switches is based on two important concepts: over-travel and mechanical memory. Over-travel occurs when the switch is activated beyond the amount of distance-traveled pre-selected in the motion detector circuit. This causes a mechanical force to be placed on the switch’s electrical contacts, causing them to separate. When the switch is released, a mechanical memory is created and the initial switch position is remembered, allowing the switch to maintain its original position after each successive activation.

In addition to providing a safe and reliable way to control and protect electrical circuits, snap action and limit switches also provide an economic alternative to contact sensors that use resistive strain sensing methods, such as the strain-relief springs and resistors. The cost savings of using such switches is one of the main advantages and is why they have become such a popular choice in many applications. Additionally, these switches offer fast response times, which not only reduce the risk of potential electrical hazards, but also improve overall system performance.

Finally, snap action and limit switches are designed to be compact and robust, ensuring that they provide reliable and accurate results for long-term use. They are often designed for harsh environments, such as dusty or wet environments, and come equipped with a variety of mounting options and safety features. This versatility makes them suitable for a wide range of applications, from medical devices and security systems, to automotive and lighting control.

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