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Old 08-10-2008, 02:19 PM   #1
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Relays


In what state are the contacts of a relay in, when de-energized, if they are nc. Do they open upon energizing or the opposite?


Last edited by Steven Jackson; 08-10-2008 at 02:27 PM.
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Old 08-10-2008, 04:04 PM   #2
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Relays


When a relay is de-energized, the contacts that should be connected are the NC or Normally Closed contacts. When you energize the relay coil, the NC contacts open up and switch the NO (normally open) contacts closed.

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Old 08-10-2008, 04:12 PM   #3
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Quote:
Originally Posted by Steven Jackson View Post
In what state are the contacts of a relay in, when de-energized, if they are nc. Do they open upon energizing or the opposite?

If they are normally closed, then they are normally closed. apply power to the coil and they are no longer closed.
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Old 08-10-2008, 06:11 PM   #4
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Relays


A little diagram to help with what has already been said.
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Relays-normally-closed.jpg  
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