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Snap action switches, also known as limit switches, are designed to perform a single electrical contact task. They are mechanical devices that use contacts to open and close a circuit when an object snaps into a predetermined position. This type of switch is commonly used in many applications, including mechanical systems, process automation, robotics, and instrumentation.

These switches have several advantages over other types of contacts. First, they are highly reliable because they are designed to maintain their contact settings for years. This durability makes them ideal for applications that require minimal contact maintenance. Additionally, snap action switches can be actuated quickly, making them an excellent choice for applications that require rapid cycling or multiple contact open and close cycles. Lastly, the contacts used in snap action switches are extremely durable, making them suitable for applications that require heavy mechanical wear.

The basic working principle of snap action switches is quite simple. When an external force is applied to the switch, a spring-loaded contact is pushed open or closed. The force is usually supplied by a mechanical lever, cam, or linkage. As the force is increased, the contact is pushed further open or closed until it reaches a predetermined position at which point the switch is set. The switch can then remain in this position until the applied force is increased or decreased, at which point it will reset itself and the contact will either open or close.

Snap action switches are typically most suitable for applications where the switch is actuated by a lever, cam, or some other external force. They are not suitable for applications where the switch itself is subject to vibration or shock forces. Additionally, the contacts used in snap action switches are not suitable for high-voltage applications such as those used in electrical systems.

Snap action switches can be found in a wide variety of applications. They are used in mechanical systems and process automation in order to detect the presence of an object and actuate a lever, valve, or some other device. In robotics, they are used to detect the position of objects and actuate robotic arms or other mechanisms. Lastly, in instrumentation, they are used to measure the position of a moving object or to switch between two states.

To conclude, snap action switches are highly reliable and can be used in a variety of applications. They are designed to maintain their contact settings for years and can actuate quickly, making them an ideal choice for applications that require rapid cycling or multiple contact open and close cycles. Additionally, the contacts used in these switches are durable, making them suitable for applications that require heavy mechanical wear.

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