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Snap Action, Limit Switches

Snap action, limit switches are electromechanical devices that are used commonly in automation applications. They consist of two or more contact blocks, an actuator or a lever, and a housing. These components are connected together and interact in a specific way in order to control the switch state. Depending on the type of product, the limit switch may provide either single pole, double pole, or multipole switching. In addition, it may provide single throw, double throw, or multi-throw switching.

Snap action, limit switches are actuated when a physical threshold is reached. Upon actuation, the contacts will open or close depending on the direction of motion. This makes them extremely reliable in controlling the motion of actuators or other automated equipment. In addition, these switches are usually available in sealed or non-sealed versions, depending on the application and environment.

One of the primary uses of limit switches is to provide feedback of a position or limit of a machine or device. An example of this could be in the operation of a motor; the limit switches can detect when the motor has reached a certain position and then execute the proper action. Another common use is to control the access or movement of objects; this could be used to prevent access to unauthorized areas or prevent objects from entering certain zones. Finally, limit switches are used to control the application of power to devices such as pumps, fans, and motors.

Snap action, limit switches can be classified depending on their construction, application, and switching capability. Construction-wise, these switches may serve as either single-pole or double-pole (DPST) switches, or multipole (MPST) switches. Application-wise, these switches may serve as either basic or safety switches. Finally, they may provide either single, double, or multi-throw switching. In addition, these switches can be available with a variety of contact kinds, such as normally open (NO), normally closed (NC), or both (NO/NC).

The working principle of snap action, limit switches is as follows. When the switch is in its “off” state, the contacts are open, meaning no current can pass through. As the switch moves towards its “on” state, the actuator causes the internal contacts to close and the switch becomes energized. Depending on the switch model, the actuator may be a lever or a plunger. Once the actuator has completed its entire travel, the switch returns to its “off” state and the contacts open again.

In summary, snap action, limit switches are electromechanical devices that are used in automation applications. They provide either single-pole, double-pole, or multipole switching, with single-throw, double-throw, or multi-throw switching operations. These switches can be used to control the motion or limit of machinery or objects, to control the access of areas, or even in the application of power. Finally, the working principle of these switches involves actuating the switch when a physical threshold is met and the contacts will then open or close depending on the direction of motion.

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