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Snap action, limit switches are commonly used in a variety of applications within electrical systems, from robotics and automation to medical, industrial and automotive fields. These mechanisms provide versatile and highly reliable, low-power means of measuring and controlling an action or process, such as the speed of an equipment, the opening and closing of circuit contacts, etc. They are designed to detect the change in a physical parameter, such as pressure, temperature, current and voltage, and set a switch accordingly.

These types of switches are mostly used in robotic and automation systems, where they are designated to detect a certain parameter and, based on the results, make a decision or perform a specific task. Consequently, they find their application in the safety and security systems, as limit switches measure the position of a robot arm and analyse the results to prevent potential disaster scenarios. Furthermore, they are used in industrial processes, where the switch typically detects different parameters and determines the flow, speed and direction of the process.

In addition to robotics and automation, snap action, limit switches are employed in medical equipment, as they control and limit the pressure being exerted on patients. Similarly, they provide a key component in the automotive industry, as they can be used for a range of purposes, such as controlling the flow of fuel, monitoring the side-view mirrors, or actuating the brakes and ignition system.

The working principle behind snap action, limit switches is based on the use of a spring-loaded switch control, which is connected to an actuating object. When the object changes position, pressure is applied to the switch control, and a sensor measures the change in pressure. This triggers the switch to open or close, depending on the type of switch and/or the use. For instance, in a normally closed switch, the contacts remain closed when pressure is applied to the switch control, and only when the pressure is released, the contacts open. Conversely, in a normally open switch, the contacts only open when pressure is applied to the switch control.

In order to ensure accurate and reliable measurements, specialised limit switches are available, offering customised settings and improved safety features. For instance, some switches benefit from magnetic sensors, which offer greater accuracy and resistance to external factors, such as shock, vibration and electrical interference. Furthermore, many switches are now available with specially designed switch control mechanisms, which are not affected by external forces and can set the switch accurately, even in difficult conditions.

Snap action, limit switches are highly reliable components and can be used in a wide range of applications, from robotics and automation to medical and automotive fields. They are designed to detect the change in a physical parameter and set a switch accordingly, in order to control and limit the pressure being exerted on patients, or to measure the position of a robot arm and prevent potential disasters. The working principle behind these switches is based on the use of a spring-loaded switch control and a sensor, which measure the change in pressure and trigger the switch open or closed, depending on the type of switch.

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