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SCR question

Discussion in 'General Electronics Discussion' started by jcurrie, Dec 16, 2013.

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  1. jcurrie

    jcurrie

    128
    1
    Feb 22, 2011
    i'm replacing several relays with a SCR my querstion some one gave me a boatload of 400V 2AMP scr will these work at 6 to 12 Volt DC range at around .7 amp or in the internal loss to much for this low voltage? i know in the past i have used SCR's at 60% of listed max and they work ?
    jcurrie
     
  2. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    A SCR and relay do different things The SCR will turn on but not turn off like a relay unless it is switching AC.

    A SCR will need over a volt across it to work. This may give too much loss in a low voltage circuit

    A SCR needs a minimum current to hold on, 0.7A should be plenty, look in the data sheet.
     
  3. jcurrie

    jcurrie

    128
    1
    Feb 22, 2011
    thanks due to space constraints is why i was looking into replacing the relays will lookinto SCSs . most of my work with SCRs was in high current apps in the industral sector, as for data sheets the bag just says 400v 2 amp no part # on case .
     
  4. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    A popular small SCR is the C106M. (400V, 4A)
    This drops 2.2V when on.
    It needs 20mA through it to start.
    It needs 3mA to hold on.

    I would think your devices would be similar.
     
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