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Snap action and limit switches are pivotal components of many industrial automation systems. These switches allow automation systems to sense the position of a component. This is a critical component of automation because the position of a component affects the operation of the system. This article will explore the application field and working principle of snap action and limit switches.

Snap action switches are mechanical switches that use a snap or snap dome mechanism to switch quickly and accurately between two states: on and off. The snap dome contacts are triggered by the release of an internal contact from a spring-loaded mechanism. Each time the switch is actuated, the contact releases from the spring and snaps back into position. The switch is then considered "on."

Snap action switches are primarily used in applications where a circuit needs to be opened and closed quickly and accurately. This includes applications such as HVAC, automotive, instrumentation, lighting, and industrial control. They are also used in arcade game machines, vending machines and ticketing kiosks.

When compared to traditional switches, snap action switches respond to less force and provide faster switching operations. This makes them ideal for use in high-speed automation systems. Additionally, snap action switches are usually more reliable and repeatable in a given application when compared to other types of switches.

Snap action switches are available in two main types: normally open (NO) and normally closed (NC). Both types contain two sets of contacts: one set that is permanently connected, and another set that connects to the connection when the switch is actuated. NO switches are connected when in their default positions, and break the connection when actuated, while NC switches are disconnected when in their default positions, and connect the connection when actuated.

Limit switches are similar to snap action switches, but instead of being actuated with the release of a spring-loaded mechanism, the switch is actuated when a moving component stops in a predetermined position. Limit switches are generally used in automation systems to detect the end of travel or end of stroke positions of various components. These switches are available in two main types: direct-acting and indirect-acting.

Direct-acting limit switches are actuated by the movement of the component itself. They usually contain an actuator that is connected to the component and is activated when the component reaches the predetermined position. The switch is then triggered, and the contact opens or closes, depending on the type.

Indirect-acting limit switches are actuated by magnets, solenoids, or other external mechanisms. They contain an actuator that is connected to an external mechanism and is activated when the external mechanism reaches the predetermined position. The switch is then triggered, and the contact opens or closes, depending on the type.

Limit switches are typically used in industrial applications to detect the positions of machine parts and components. They are also commonly used in motor control applications, for example, to detect the start and stop positions of an actuator. Additionally, limit switches can be used to detect the level of fluid in tanks and the positions of doors and windows.

In conclusion, snap action switches and limit switches are pivotal components of many industrial automation systems. They allow automation systems to accurately and quickly detect the positions of various components. Snap action switches detect changes in electrical pressure, while limit switches detect changes in position. Both switches are used in a wide variety of industrial applications, and offer reliable and repeatable results over traditional switches.

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