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Relay Library Symbol Standard — Parallax Forums

Relay Library Symbol Standard

bradsawhaoldbradsawhaold Posts: 1
edited 2021-11-16 07:31 in General Discussion

I don’t often use relays in my projects but I was investigating a simple circuit that required a relay. At this point any DPDT relay would do.

My surprise and questions is:
It seems all the relays in the standard library are drawn in what appears to be the “energized coil” position. I had always drawn relays in the unenergized position where the moveable relay element was furthest away from the coil.
I also see the “contact” point on the stationary contacts have a filled or not filled configuration. From a standards view I’m not aware of the meaning of such a graphic.

Is there some recent standard for drawing a relay in such a manner?

Comments

  • JRoarkJRoark Posts: 1,215

    I’m not following your question. What library are you referencing?

  • MicksterMickster Posts: 2,609

    Contacts are referred to as Normally Open (NO) and Normally Closed (NC)

    "Normal" = coil not energized.

    The standard that I am accustomed to is that; terminals that include a "3" and a "4" are always NO and those that include a "1" and a "2" are NC:

    11 and 12 = NC
    13 and 14 = NO

  • evanhevanh Posts: 15,187

    Swap the 1 for the 14 and have the lever leaning the other way would satisfy both.

    Of course, a solenoid can also be built to pull in either direction but, like Brad, my first instinct is to imagine it pulling the leaver toward itself.

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