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Snap action limit switches are designed to operate quickly when disturbed. They are perfect for heavy-duty applications where a reliable and repeatable mechanical operation is desired. Snap action switches are usually implemented in equipment that requires robustness and reliable switching operations. Common examples of applications of snap action switches include industrial equipment like certain types of ovens and machines, automobiles, elevators, and safety equipment.

The working principle of a snap action switch is simple. A mechanical component inside the switch, sometimes called a snap dome, is connected to an electrical contact. When the switch receives an external force, the snap dome is pushed against the contact, closing the circuit. When the external force is removed, the snap dome springs back to its original position, leaving the contact open and the circuit broken.

Most snap action switches use a plunger as the external activator. When the plunger is pushed inward, the internal snap dome moves and closes the circuit. When the plunger is released, the internal snap dome returns to its original position and the circuit is opened.

The most common type of snap action switch is the single pole single throw (SPST) switch. This type of switch only has one contact that is either closed or open when the switch is actuated or released. Single pole single throw switches are often used in applications where a single connection needs to be opened and closed repeatedly with a single action.

Other types of snap action switches include double pole single throw (DPST) and double pole double throw (DPDT). Double pole switches have two contacts, which can be open or closed at the same time. This makes them more suitable for applications where two connections need to be controlled. Double pole double throw switches control two separate circuits and can be used for applications such as controlling multiple motors with a single switch.

Some snap action switches use a mercury switch instead of a plunger. A mercury switch uses a small amount of electrically conductive mercury contained between two leads. When the switch is tilted, the mercury rolls to the lower contact and closes the circuit. When the switch is returned to its upright position, the mercury returns to the upper contact and the circuit is opened.

Modern snap action switches can be mounted on a panel, in a wall, or embedded in a device. They are reliable and durable, making them suitable for use in applications where vibration, shock and temperature stability are important considerations. They are also easy to install and don’t require a lot of maintenance.

Snap action limit switches are widely used in many different industries, including industrial automation, aerospace, automotive and consumer electronics. They can provide reliable and repeatable operations, even in the most demanding environmental conditions.

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