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Simplest electromechanical relay circuit

Discussion in 'Electronic Design' started by Don Kuenz, Dec 22, 2013.

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  1. Guest

    Geez, really? The installed wiring base spans at least 90 years so, unless there is a requirement for retrofit, don't expect an abrupt decrease in frequency.
  2. Thank you. Your example suggests that instead of "not *really* the
    best," it is "not *always* the best."
  3. josephkk

    josephkk Guest

    That is not really the best. There are special cases (Classified
    locations and some specific safety equipment relating to classified
    locations) where switching neutral is correct, but generally it is not the
    best idea. See NEC article 500 et seq.

  4. Low side switching is very common but it usually does not leave the
    safety zone. For example, inside an industrial control cabinet and
    integrated reversing relays that passes the neutral of a pair of coils
    through an overload contact.

    Other examples where you may need various voltages to be switched from
    a single triac output module array. Those would have it's common leg
    tied to neutral and all the devices coming to each triac output would be
    alive at all times with their required voltages, 24, 48, 115, 230, 480
    AC. Etc.

  5. Greegor

    Greegor Guest

    Chances are, you have a 12V coil.
    Wasn't there a "rule of thumb" for
    voltage rating relays yourself?

    I seem to recall 1.5 times the voltage
    that barely actuates it, but it could
    have been double just for reliability.

    How did they figure the top end of
    the voltage range?

    I seem to recall some relays marked
    with resistance and a current but
    no voltage specified.
  6. Jasen Betts

    Jasen Betts Guest

    A bit less than what melts it? *

    or degrades plastic parts too quickly etc
    at max rated ambient temperature
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