83893302

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Snap Action, Limit Switches

Snap action switches, also commonly referred to as limit switches, are rugged, reliable, and versatile. They serve a variety of purposes, including identifying the presence of objects or materials, sensing change in material level, and providing various control functions in a variety of applications.

83893302 Application Field

Snap action switches are commonly used in the automotive, industrial, commercial, and residential sectors. Automotive applications include power window and doorlock controls, ancillary switches such as speed limit switches, and controls for traction control systems. Industrial applications include material level sensing and conveyor systems, and industrial machine controls. Commercial and residential applications involve lighting controls and on-off switches for pumps and motors, doorbells, and security systems.

Working Principle

A snap action switch requires a particular amount of pressure to activate the mechanism. The pressure limit can be adjusted to a desired level through the use of a mechanical or electronic potentiometer. When the switch is actuated, a spring-loading mechanism causes the armature to move rapidly. This produces an audible click and releases the contacts of the switch. As the actuation pressure decreases, the armature returns to its original position, and the contacts close again.

Snap action switches are designed with a wide range of internal components, including an armature, a contact block, springs, and an actuating mechanism, all of which work together to ensure that the switch operates properly. The armature connects the contact block to a lever or plunger and is typically either made of steel or plastic. The actuating mechanism is the key component that determines the speed and nature of the switching mechanism.

Depending on the application, a snap action switch can be designed with either normally open (NO) or normally closed (NC) contacts. NO contacts are typically used for control functions, such as the on/off control of a motor or valve, whereas NC contacts are used for sensing applications to detect the presence or absence of an object. Snap action switches can also be designed with latching or momentary contact configurations.

Conclusion

Snap action switches, commonly referred to as limit switches, are rugged, reliable, and versatile devices that serve a variety of purposes. They are commonly used in the automotive, industrial, commercial, and residential sectors, and can be designed with either normally open (NO) or normally closed (NC) contacts. It is important to note that snap action switches require a certain amount of pressure to actuate the switching mechanism, and the pressure limit can be adjusted depending on the application.

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