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Snap Action and Limit Switches

Snap action switches and limit switches are types of switches that are used to control the operation of electrical devices. They do this by allowing a user to open or close an electrical circuit as desired. These switches are commonly used in factory automation, robotics and security systems. In this article, we will discuss the applications and working principle of each type of switch.

Snap Action Switches

Snap action switches are most often used in industrial control applications. They are designed to operate a circuit when a predetermined force is applied. This force is usually generated by a mechanical system, such as a spring or lever. When the predetermined force is applied, the switch will open or close the electrical circuit, allowing it to be controlled by the user.

The operation of a snap action switch relies on its two distinct parts. The first part is the movable contact, which is connected to an actuator. The second is the fixed contact, which is connected to the power supply. When a predetermined voltage is applied to the actuator, the movable contact will become attracted to the fixed contact. Once contact is made, the electrical circuit is then completed, allowing the switch to function.

Snap action switches are often used in applications that require quick reactions. Some examples of these applications include elevator door switches, starter relays and thermal overload relays. Their quick response time makes them an ideal choice for applications that require frequent operation.

Limit Switches

Limit switches are another type of switch commonly used for industrial applications. They are designed to detect a physical limit or boundary. When the limit is reached, the switch will either open or close an electrical circuit.

The operation of a limit switch relies on its three distinct parts. The first is a sensing element, which is designed to detect the physical limit. The second is a movable contact, which is connected to the sensing element. The third is the fixed contact, which is connected to the power supply. When the sensing element detects the physical limit, it will cause the movable contact to become attracted to the fixed contact. This will then complete the electrical circuit, allowing the switch to function.

Limit switches are often used in industrial equipment such as motors, conveyors and pumps. They are also used in robotics to detect the boundaries of a workspace and adjust the robot’s movements accordingly. By sensing the physical limit, these switches ensure the safe operation of industrial machinery.

Conclusion

In conclusion, snap action switches and limit switches are types of switches commonly used in industrial control applications. Snap action switches rely on a predetermined force being applied to open or close an electrical circuit. Limit switches rely on a sensing element to detect a physical limit, allowing the switch to function accordingly. Both of these switches are essential for the safe and efficient operation of industrial machinery.

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