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Snap action, limit switches provide an economical method to enable or disable electrical circuits. These simple mechanical devices allow either manual or automatic electrical system operation. In basic terms, a snap action, limit switch is a common type of switch that opens or closes a circuit when an object or component moves beyond a specific limit. Snap action, limit switches can be used to monitor motion, pressure, temperature, and other conditions to control electrical equipment operation or warning systems.

This article covers the basics of snap action, limit switches including their application field, working principle, and its components.

Application Field

Snap action, limit switches are widely used in a myriad of industrial applications. Some of their most common applications include controlling mechanical processes, sensing movement and positions, controlling electrical devices and circuits, providing overload protection solenoids, limiting pressure and temperature, and controlling pneumatics and hydraulics. Snap action, limit switches can be found as parts of relays, transformers, switches, and even vending machines.

Snap action, limit switches are designed to function with specific types of industrial and mechanical applications. They are typically used to sense either a closed state or an open state, or a low level or a high level, in order to control the electrical device or circuit. Some limit switches have a manual operation, others are automatic, and some are even adjustable.

Working Principle

The most basic limit switches work by using a metal arm connected to a spring. When the metal arm is pushed, the spring is compressed and, depending on the system, either an electrical or mechanical contact will be made, thus activating the switch. This action is repeated each time the metal arm is moved past a certain point, closing and opening the switch.Other types of limit switches work slightly differently and use different types of mechanisms. These may include cycling switches, magnetic reed switches, and proximity switches. The principle behind these types of switches vary slightly from each other but work essentially on the same basic principle.

Components

Snap action, limit switches are composed of multiple components that all play an important role in the functioning of the switch.

The first component is an actuator that is mechanically connected to the switch’s action lever. This actuator can be a plunger, a roller, or a lever depending on the model and application. Next, a switch box is used to hold the switch and the actuator in place.

The next component of a limit switch is a contact block. This contact block is designed to control the opening and closing of the switch’s contacts. Inside the contact block are contact plates that are made out of metal.

Finally, the last component of a limit switch is a case. This case is made out of either metal or plastic and is designed to provide protection for the internal components of the switch.

In conclusion, snap action, limit switches provide an economical and efficient way to control electrical devices, circuits, and processes. By understanding the various components, application field, and working principle, these switches can be used to great effect in a variety of industrial applications.

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