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Relay-87A vs 87Q

Discussion in 'Chat & Tech Info' started by Bacongrease, May 4, 2021.

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  1. Bacongrease

    Bacongrease Tuned and Synch'ed GT Contributor

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    so, what is the difference between 87A and 87Q ?
    The auto parts guys don't know.
    they are at the same location on the relay. ? ?
     
  2. Kevin.NZ

    Kevin.NZ High Miler

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    Ive only ever seen 87a and 87b
     
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  3. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    I do not claim to be an electrical engineer at all.

    In “Start Trek” terminology, one is “matter” while the other is “anti-matter”.


    FWIW:

    87Q Operating Signal

    It is beneficial to realize that the 87P and 87Q operating signals are related. The 87P operating signals are per-phase sums of the phase zone currents. The 87Q operating signal is the sum of the negative-sequence components of all the phase zone currents.
     
  4. Kevin.NZ

    Kevin.NZ High Miler

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    well thats cleared that up
     
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  5. Moto-Uno

    Moto-Uno Cruisin' Guzzisti

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    ^^ Did you mean phazers on stun :) ? Peter
     
  6. Bacongrease

    Bacongrease Tuned and Synch'ed GT Contributor

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    ?



    .
     
  7. V700Steve

    V700Steve GT Reference GT di Razza Pura

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    I have to know, what vehicle this is on ?
     
  8. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    Exactly!

    The 87a and 87b are DIN designations.
    I couldn’t even find a 87q reference at the DIN website.

    The only 87q relay info I found was a scientific paper with that explanation in the introduction.

    I searched for quite some time and couldn’t even find a 87q relay to look at.

    DIN relays almost always have the schematic of the relay construction right on the housing itself. No luck with an 87q.
     
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  9. Kevin.NZ

    Kevin.NZ High Miler

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    I think they need new glasses, the b has been mistaken for q. ha ha
     
  10. vagrant

    vagrant GT Reference

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    The q needs a viagra!
     
  11. jwtucker

    jwtucker V11 Sport 4 Life

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    Yeah, I was curious as well when this thread popped up, and started doing some reading. I'm no electrical engineer, but it really does seem that "87Q" is referring to something entirely different than automotive relays. I'm not surprised the parts guy was baffled.

    __Jason
     
  12. jwtucker

    jwtucker V11 Sport 4 Life

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    I just happened to have 3 different relays (of the same type) sitting here at my desk. Mostly everything you need to know is stamped on the side.

    Pinout:
    1 = 85 (coil)
    2 = 86 (coil)
    3 = 30 (common)
    4 = 87a (normally closed)
    5 = 87 (normally open)

    IMG_1250.JPG

    __Jason
     
  13. Dinsdale Piranha

    Dinsdale Piranha Cruisin' Guzzisti GT Contributor

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    Do you have a multimeter and a 12v source? A little logic and those 2 items make it quit easy for you to work it out.
     
  14. Moto-Uno

    Moto-Uno Cruisin' Guzzisti

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    Or , #85 is the ground
    #86 is power from the switch
    #30 is main power in
    #87 is main power out (to operate the switched device) ie; power to a starter solenoid
    Peter
     
  15. PaulDavies

    PaulDavies Cruisin' Guzzisti GT Contributor

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    Not heard of 87q either but here is a good guide for "Automotive Relays" (I guess that covers us)

    12voltplanet.co.uk

    "It's a relay Jim, but not as we know as it" - all together now
    "there's klingons on the starboard bow, starboard bow, starboard bow........"
     
  16. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Enough of the Q question. Q was enough of a problem on Start Trek the next generation. Thread is now locked.
     
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