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Help to identify fan terminal type

Discussion in 'Power Electronics' started by partyanimallighting, Jul 31, 2020 at 10:23 AM.

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  1. partyanimallighting

    partyanimallighting

    319
    4
    Oct 22, 2012
    Hi guys, I'm changing out some fans and I'd like to replace the terminal connectors but I'm not sure of the type. My Google Foo points towards an SM-3A auto electrical connector but I'd like to get a second and third opinion. The image shows both types, a 3 pin and a larger 4 pin. Although what I found is listed as an auto electrical connector, these connectors are installed in a moving head. Go figure....... here's the link to what I Googled.

    https://www.alibaba.com/product-detail/3-pin-auto-electrical-wiring-harness_60556861533.html

    Thanks in advance!!

    FAN TERMINALS 3 And 4 PIN.JPG
     
  2. bertus

    bertus Moderator

    747
    264
    Nov 8, 2019
    Hello,

    There are two diffrent types shown.
    I see 3 and 4 pins.
    In the 4 pin there is one pin not placed.

    Bertus
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    10,066
    2,150
    Nov 17, 2011
    Auto parts are constructed to withstand rough conditions (temperature changes, vibrations, liqids, ...). Using them in a moving appliance seems to be a good choice then. As long as the ratings (voltage, current match the requirements of the application (e.g. 12 V fan at a few 100 mA). Automotive components are usually not suitable for operation on mains voltage. If the fans you're going to replace are of the type used in computers (or similar), these connectors are perfectly suitable.
     
  4. partyanimallighting

    partyanimallighting

    319
    4
    Oct 22, 2012
    Yes Bertus, the bottom image is a 4 pin with one pin removed. This was done by the company to differentiate between the two fans. Both are 3 wire but one is a blower and one is an axial. Is this a JST SM 3 pin and 4 pin connector?
     
  5. partyanimallighting

    partyanimallighting

    319
    4
    Oct 22, 2012
    Yes Harald. Regular 12VDC cooling fans. One radial and one small blower type. So there can't be any overloading.
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    10,066
    2,150
    Nov 17, 2011
    Not in terms of voltage, but in terms of current. You need to ensure that the new connectors are rated for the current drawn by the fans. Probably a no brainer here.
     
  7. partyanimallighting

    partyanimallighting

    319
    4
    Oct 22, 2012
    Well these are small 12VDC cooling fans around 0.25A each. As you said, a no brainer. But can anyone confirm that it's actually a JST SM connector?
     
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