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Snap action, limit switches are designed to detect the establishment or interruption of an electrical connection or for sensing physical or mechanical position. A wide variety of snap action, limit switch applications exist in industrial, consumer, and commercial products as well as in specialized applications such as automotive applications and medical devices. Many types of snap action, limit switches are available, each suited for a specific application.

Snap action, limit switches work by sensing the physical position of a spring-loaded lever, plunger or roller within their housing. When the actuator is moved to its actuation position, it forces the internal contact to make and break the electrical connection. In some snap action, limit switch designs, the actuator itself makes contact with a pair of contacts. In other designs, the actuator causes a set of lever-mounted contacts to open or close the connection. Some snap action, limit switches are normally open (NO) and others are normally closed (NC).

The operational advantages of snap action, limit switches include: high resistance to wear, good electrical insulation, and a high degree of repeatability when the actuator is tripped. Additionally, snap action, limit switches typically require very little technical attention and provide a long service life.

The most common application of snap action, limit switches is in automation and control system applications. These types of switches are used to activate control systems or to indicate the position of a machine or object. For example, a limit switch may be used as safety switches in industrial machinery, or to indicate when an open, close, or running position has been reached. Additionally, snap action, limit switches may be used to detect the temperature of a hot process monitored by control systems.

Snap action, limit switches are also used in a number of consumer electronics applications. For example, they are often used as power switches, keypads and lever switch activators. They are also frequently used in industrial equipment and process control systems as well as in security and surveillance systems. Additionally, snap action, limit switches are used for load and recording control in industrial printing machines, water level indicators, and elevator controls.

Snap action, limit switches are typically constructed of metal and plastic components. They can be prepared for a wide range of operating conditions, including extreme temperatures and different levels of pressurization and vibration. Many snap action, limit switches come with actuators that are composed of either metal or plastic components, or both. In some designs, an additional contact is added to provide incremental mechanical movement.

More specialized designs of snap action, limit switches take advantage of their spring-action to provide a reliable means of automatically activating the contacts. This type of switch is often used to detect the presence of a physical object, such as a button or lever used to un-powered a process. These types of switches may also be used as jam detection devices, detecting objects that block a passage.

For applications that require accurate current or position sensing, specialty snap action, limit switches are available. These types of switches may have greater endurance to the effects of wear and tear, as well as increased precision. Additionally, these types of switches may be matched to a particular application if noise, range of travel, or other considerations are important.

In conclusion, snap action, limit switches provide an invaluable tool to maintenance staff and engineers due to their long life and resilient construction. These types of switches are used in a wide variety of applications, from industrial and commercial to consumer electronics, and often provide greater reliability and better value for money compared to other types of switches.

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