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What component is this? (relay content)

Discussion in 'General Electronics Discussion' started by audihenry, May 9, 2013.

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  1. audihenry

    audihenry

    4
    0
    May 9, 2013
    Hey guys,

    I'm taking apart a small winch and it predictably had a relay in there (12V 40A), but it also had a smaller 12V 25A component. Part of me thinks it's another relay (for what?) or a fuse of some sort? Any help will be appreciated!

    [​IMG]

    [​IMG]

    Any help will be appreciated! Thanks!
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    It's a relay... As for what trace back the wires...
     
  3. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    A 2 pin relay ?? thats a new one ;)

    more likely a bi-metallic thermal circuit breaker for if the winch jams

    Dave
     
    Last edited: May 9, 2013
  4. alfa88

    alfa88

    344
    5
    Dec 1, 2010
    Davenn wins.
     
  5. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    yeah we and the OP knows the first one is a relay

    it was the 2 pin second item we were commenting on :)

    Dave
     
  6. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    True, only the first image was appeared last nigh for me when I read the post though...
     
  7. audihenry

    audihenry

    4
    0
    May 9, 2013
    Thanks guys. So I googled away but could not find a thermal switch that looked anything like this, even if looking specifically for a 12V 25A one. If it is a thermal switch then I could re-use it, but I'm just not sure. As far as wiring, I cut it all up before realizing that it wasn't the best approach. :eek:
     
  8. Mongrel Shark

    Mongrel Shark

    260
    18
    Jun 6, 2012
    What was it connected to in the winch? Did you notice before you cut the loom up?

    Presumably the relay turned the motor on, perhaps this device is some kind of safety, that stops the motor burning out if it winds all the way in, or some idiot attaches it to something too heavy. Or it could have something to do with a ratchet? Was the ratchet automatic or manual?

    I'm thinking its some kind of thermal cutout to prevent motor burnout. Are there re-settable thermal fuses that look like that?
     
  9. audihenry

    audihenry

    4
    0
    May 9, 2013
    Not a ratchet mechanism, that is a hardware based implementation. Here's photos of it opened up. Looks like a safety / overload switch? Are these one-time (unlikely) or reusable (likely)?

    [​IMG]

    [​IMG]
     
  10. alfa88

    alfa88

    344
    5
    Dec 1, 2010
    Cool Pic! As current increases the curved bi - metal plate expands, In a over current condition the curve straightens out to the extent that the welded 'point' on the end breaks contact with the mating contact. In most cases when when the over current event subsides the metal strip assumes it's curved shape, the points are re-connected and all is right with the world, In severe case there will be damage resulting in a permanent closed or permanent open condition.
     
  11. audihenry

    audihenry

    4
    0
    May 9, 2013
    Thank you very much for that awesome explanation!
     
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