Relay pins labeling... Where does it make sense ?

Discussion in 'General Electronics Chat' started by Externet, Aug 8, 2013.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    What was the rationale to come up with the numbers 30, 85, 86, 87, 87A ?
    Makes no sense at all instead of 'coil', C, NC, NO

    I believe is some german thing from late sixties, but never knew the reason. Still carried on...:mad:

    And schematics show other numbers as nodes...
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Perhaps the following drawing might give you an idea:

    [​IMG]

    Bertus
     
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  3. strantor

    AAC Fanatic!

    Oct 3, 2010
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    The numbers correspond to old automotive chassis wire terminal numbers spelled out in DIN Standard 72 552. Not sure if that standard is still used. see the whole list.
     
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  4. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Thanks Bertus.
    Yes, same as per my attachment.

    But if the '30' denotes battery plus, how is any german entity supposed to force/rule anyone to use a relay here or there, this or the other way ?

    The DIN 72552 shows coil terminals being 87, 88 for the common pins, not 30.
    And 87a, 87b ... for the contacts. Does not match with relays manufacturers.

    This 72552 has to be an arbitrary decision after a heavy night at the bar.:(
     
    Last edited: Aug 8, 2013
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Number standard still used in my current GM model, anyway!
    Max.
     
  6. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    Always heard it was from the VW Beetle wiring diagram. And that Bosch just went along with it.
     
  7. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Whoever said a standard had to make any sense?

    [​IMG]
     
  8. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Awesome! Thanks Strantor, I love learning something new. :D
     
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