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Snap Action, Limit Switches

Snap action switches (also known as snap switches) are electric switches that open and close circuits as a result of a mechanical operation. When actuated, they snap rapidly from one position to another, and so the switching action is quite quick. Snap action switches are normally used in safety systems, implements, and machine tools, in which reliable operation is important.

At their most basic, snap action switches are made up of a spring-loaded lever actuator, a set of contact points, and a reset coiled spring. When the lever is pushed, the contact points open or close, producing an electrical signal. The spring then returns the lever to its resting state, and the contact points return to the original position.

Applications

Snap action switches are invaluable components in modern industrial and consumer products. Here are some common applications of snap action switches.

• Automotive: Switches used in vehicles typically have a heavy duty rating to handle the high electrical loads of the automobile. They are used for control applications both in the interior (e.g., climate control, infotainment systems) and exterior (e.g., windshield wipers and lights).
• Household appliances: Snap action switches are used in everyday appliances such as toasters, hair dryers, and vacuum cleaners as OSP switches or user-input buttons. These switches can handle the high loads of a motor and the frequent switching cycles required for most appliances.
• Security and safety systems: Snap action switches are ideal components of safety systems such as fire and intruder alarms, panic buttons, and sprinkler systems that must keep functioning even when other components fail.
• Machinery and equipment: Snap switches are used in industrial settings for a variety of functions, including process control and automation. These switches can also be used to detect and limit the abnormalities in a process.

Working Principle

Snap action switches work because of the lever actuator, the contact points, and the reset coiled spring. When the switch is actuated, the lever pushes down on the contact points, opening or closing the circuit. This movement of the lever is resisted by the spring, and once the lever reaches its furthest point, the spring returns it to its rest state, and the contact points reset back to their original position.

This rapid, repetitive motion of the switch is known as the “snap action”. This feature makes snap action switches ideal for applications that require fast switching, as they can actuate much quicker than other types of switches, such as toggle switches. This makes them an ideal choice for safety systems, as they can respond quickly and accurately to any variation in the environment.

The key to understanding snap action switches lies in the movement of the contact points and the lever. The contact points move much faster than most other types of switches, which makes them ideal for high-speed switching applications. Additionally, the reset coiled spring ensures that the lever always returns to its resting state and that the contact points always reset to their original positions.

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