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energizing fans

Discussion in 'General Electronics Discussion' started by woodzer, Jan 8, 2016.

  1. woodzer

    woodzer

    3
    0
    Jan 8, 2016
    hello all, I'm a newbie here. I have a question I hope can be answered easily. I need to energize a 20a 115v duplex with a low voltage momentary switch and time out the circuit at 5 minutes. It is for a child's project, hence the low voltage start switch. There are two small fans that need to run for 5 minutes at a time. Thank you in advance
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,063
    1,822
    Nov 17, 2011
    How about this kit (or a similar one?
    On the low voltage side it requires 12V power (not inclded), on the high voltage side it can switch up to 2.5A at 110 V (AC).

    Take care of proper insulation, a suitable platsic housing is recommended on their website. A pushbutton is also separately required.
     
  3. woodzer

    woodzer

    3
    0
    Jan 8, 2016
    Thank you, that is the direction I need to go, although I need more amps on the 115v end. I will be operating two blower fans at the same time, so will need start up amps. I figure 20a at 115v.
    Guten morgen.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    9,063
    1,822
    Nov 17, 2011
    What kind of fans are you using? 2kW for a child's project?

    Anyway, you can use an additional relay which is controlled by the timer board's relay (use 12V coil also) and which has the required amps on the contact side. Here's a collection of a few examples.

    Guten Abend :D
     
  5. woodzer

    woodzer

    3
    0
    Jan 8, 2016
    Again, thank you. Are you familiar with air hockey, this is basically what I'm doing. We are using two 1/16 HP fans that can use up to 10a each. I need to set up for a child to switch on with a momentary and the fans to operate for five minutes, then shut down.

    danke schön
     
  6. BobK

    BobK

    7,590
    1,635
    Jan 5, 2010
    Since 1 HP is 745W, your fans should be somewhere around 745/16 = 46W. And you say they take 10A at 115V = 1150W? That is quite an inefficient fan. Are you sure is not 1.0A?

    Bob
     
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