8PA42

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Snap action mechanical switches, more commonly known as limit switches, are an important component of industrial automation. The 8PA42 is a particularly reliable and common variety, designed with a micro switch configured in an encased body. This article will explain the 8PA42 application field and working principle in detail.

Application Field of 8PA42

The 8PA42 is typically used in light duty applications such as transportation equipment, conveyors, printing presses, automated packaging machines, textile machines and other processing equipment. The switch is designed to last through a long period of arduous work and is characterized by excellent practicality, stability and endurance. The 8PA42 can work in extreme temperatures, wet or dusty conditions, strong vibrations and radiation.

Working Principle of 8PA42

Unlike other limit switches, the 8PA42 is equipped with a unique cam mechanism that allows for a quick and reliable “snap” action for switching. The 8PA42 utilizes a micro switch attached to a series of cams and levers. When the switch is triggered, the cams and levers work in unison, creating a small amount of movement that “snaps” the switch open or closed, as you can see in this diagram:

The switch can be configured in a variety of ways and the cams can be adjusted so that the “snap” action occurs at different points. The 8PA42 is set to “normally open” by default, meaning that it will open when the switch is triggered, but can be reversed if necessary. The 8PA42 is also designed to be protected from external influences while in use, so it is thoroughly tested and designed to be water and dust proof.

Conclusion

The 8PA42 is an excellent option for light duty applications as it is reliable, durable, and adjustable for a variety of needs. The unique snap action mechanism is responsible for its fast reaction time and its protective housing provides excellent protection from external influences. It is a commonly used and much appreciated switch for industrial needs.

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