Relay contact form

Discussion in 'General Electronics Chat' started by Mustwin351, Apr 19, 2014.

  1. Mustwin351

    Thread Starter New Member

    Apr 11, 2013
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    Anyone happen to know if a minature relay with a form A contact rating can be replaced with a form C version.

    My understanding is form A is a SPST-NO

    Whereas form C is a SPDT, where the common pin is normally connected to one of the contacts (de-energized), and then flips over to the other contact upon energizing the coil.
     
  2. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    I would say you could use a form C in lieu of a form A contacts.
     
  3. Mustwin351

    Thread Starter New Member

    Apr 11, 2013
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    That was what I was thinking. Just need to be sure I am using the normally open set of contacts
     
  4. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    That is also correct.
     
  5. wmodavis

    Well-Known Member

    Oct 23, 2010
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    You are correct on all three!
     
  6. Mustwin351

    Thread Starter New Member

    Apr 11, 2013
    12
    0
    Thanks wmodavis
     
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