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Snap Action, Limit Switches

Snap action limit switches are a type of electro-mechanical momentary contact switch used for controlling electrical equipment and circuits. They were first used in the late 19th century and remain in widespread use today. They are composed of a contact, armature, and spring-loaded switch mechanism. The contact can be either a normally open contact, normally closed contact, or a momentary contact.

The housing of a limit switch typically has an opening in the center where the armature is mounted. A spring is attached to the armature, and when the armature is moved by an external force, it compresses the spring and opens or closes the contact. The different types of switches are distinguished by the action of the armature in relation to the contact.

Normally open (NO) switches have contacts that are initially open before the switch is actuated. When the armature is moved, it closes the contact, completing the circuit. Normally closed (NC) switches have contacts that are closed until the switch is actuated and the armature is moved. Momentary switches have contacts that must be held in position in order for the circuit to stay closed. These types of switches are commonly used to control motors or other devices for a brief period of time.

These switches are utilized in a variety of applications in both commercial and industrial environments. Their small size, durability and ease of installation make them ideal for use in tight spaces where other types of switches would be difficult to install. They are commonly used in machine controls, process controls, and other automated systems.

Limit switches can also be used for safety purposes. In many cases, if a potential safety hazard is detected, a limit switch can be used to shut off the power to a machine or process and prevent injuries or property damage. Most limit switches are designed with an adjustable travel distance, which enables them to be tailored to meet specific safety requirements or application needs.

As with other types of switches, limit switches can also be controlled remotely. This enables the switch to be operated from a remote location, allowing for safer operation of hazardous machinery and other processes. Limit switches can also be integrated with other components, such as timers and counters, and used to control multiple devices at once.

There are a wide range of limit switches available to meet the demands of a variety of applications. Different types of contacts, armatures, housing materials, and other features are available to ensure the best performance for a given application. Different switch manufacturers have their own specifications, ensuring the best fit for any particular setting.

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