D4SL-2PDA-D4

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Snap action, limit switches provide accurate overtravel and feedback performance when applied in automatic control circuit appliances and complex systems. D4SL-2PDA-D4 limit switches are a type of snap action switch, specifically designed for the harsh environment of Group 2, Category 3 or 3G applications. It provides simple installation, reliable operation and complete interchangeability amongst its body, actuator and contact mating parts.

Applications

D4SL-2PDA-D4 snap action limit switches are used in a wide variety of applications including automotive and industrial applications, vehicle and machine applications, pipe inspection systems and various robotics applications. This popular switch also finds useful in food & beverage processing machines, brewing equipment, packaging & wrapping machines, agricultural poles, vending machines, window actuators and a wide range of other applications.

Working Principle

The working principle of a snap-action limit switch is based upon a snap action mechanism. The common construct of the switch consists of a spring element, an electrical contact, and a moving plunger. This switch works based on the physical principle of a lever, where an applied force is converted into a displacement in one simple step. When the plunger is moved towards the switch body, the spring element is compressed against the electrical contact. When the plunger is moved away from the switch body, the spring element is released and the electrical contact is opened.

The spring element helps the plunger to move on the axial direction of the switch and when it overcomes the forces keeping it in a specific position, an instantaneous movement happens and the plunger snaps either OPEN or CLOSED. This action is known as “Snap Action”. This snap-action provides accurate feedback and is highly reliable even in the harshest of environments.

Conclusion

The D4SL-2PDA-D4 snap action limit switch is a type of switch specifically designed to operate in the most challenging of applications and conditions. Its simple installation, reliable performance and complete interchangeability among its body, actuator and contact mating parts make it an ideal choice for automotive and industrial applications as well as vehicle and machine applications. It is also widely used in pipe inspection systems, robotics applications and a variety of other applications. The principles of lever action and snap action are the basis of this limit switch’s working mechanism, making it highly reliable and accurate.

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