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Does a triac switch DC ?

Discussion in 'Electronic Basics' started by Linden, Oct 14, 2004.

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  1. Linden

    Linden Guest

    Im trying to make a solid state relay with a triac (BTA16 600B)

    Im just testing it by turning on the gate and trying to pass a DC
    current through the terminals 1 and 2.. doesnt seem to work, yet it
    works when trying to pass a current through terminal 1 and the gate ?

    Unless the data sheet is wrong in its pin layout !
  2. CFoley1064

    CFoley1064 Guest

    Subject: Does a triac switch DC ?
    A TRIAC will switch DC on, but then you've got a problem -- it won't turn off.
    TRIACs are made to switch alternating current. The device will turn off when
    the voltage and current across the device is sufficiently low.

    If you try something like this, the TRIAC will never turn off (view in fixed
    font or M$ Notepad):

    | | |
    | | |
    | | |
    | .-. |
    | | | .-.
    | | | ( X )
    --- '-' '-'
    - | |
    | | T _|_
    | | --- V_A
    | '---o o-/ |
    | |
    | |
    created by Andy´s ASCII-Circuit v1.24.140803 Beta

    If you want to make a SSR to switch DC, use an optoisolator and a transistor or
    power FET. And the data sheet is right about 99.999% of the time, if it's not
    a preliminary data sheet. Always look at your wiring and circuit first.

    Good luck
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