Multi testing

Discussion in 'General Electronics Chat' started by jismagic, May 12, 2014.

  1. jismagic

    Thread Starter Member

    Sep 7, 2013
    77
    0
    I have to switch a load between 9 products to enable automation.

    I can think of putting 9 relays , each one to handle 10-20A. The relays to handle
    these high current are very costly.

    is there anything out of box i can apply to achieve this.

    thanks
    jis
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    you dont mention at what voltrage these relays will be used. if at 12 volts dc, automotive relays are quite reasonable priced.
     
  3. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    If you are in the USA the surplus market abounds with NEMA rated size one motor starters. 27A

    I just bought 8 Cuttler Hammer for $5 each on Ebay for a bridge crane refurbishing.
    The originals lasted 50+ years of PWM ( :D )service.
    Contacts were as new.
     
  4. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    Or these 40A definite purpose contactors, brand new for ~$10 as I recall.

    [​IMG]
     
    Last edited: May 12, 2014
  5. ian field

    Distinguished Member

    Oct 27, 2012
    4,413
    782
    You might be able to find solid state relays at better prices than electro-mechanical ones - but there's a few gotchas if you need to switch reactive loads.
     
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