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We all know how normally closed and normally open sensors and contacts work and how they differ from each other.

But in real-world conditions when we are choosing the instrument switches or other types of discrete equipment for a process, we have to select which one should work with a Normally Open contact and which one should work with a Normally Closed contact.

So, in this video, we'll answer these questions and investigate the real-world application examples of Normally Open and Normally Closed Contacts such as Contactors and relays, pushbuttons, instrument switches, and so on. We also will have a quick look at the NAMUR sensors at the end of this video.

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SECTIONS of this video:

0:00 important questions about NO and NC contacts
0:59 different types of discrete signals in the industry
1:27 NC and NO contacts application in a contactor (Example)
2:05 NC vs NO sensor (Example)
3:52 why normally closed contacts should be integrated into stop push buttons?
4:37 NAMUR switches instead of normal switches

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