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10(3) A 250 V~ switch

Discussion in 'Electronic Components' started by Bernhard Kuemel, Aug 10, 2012.

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  1. legg

    legg Guest

  2. Jamie

    Jamie Guest

    More than likely the difference between DC amps and AC amps. Most
    switches handle less DC amps at the same voltage. This is due to the
    lack of no interrupts you normally get with AC which works better to
    quench the arc (Plasma).

    But then again, don't listen to me, I am a farm boy, born where every
    one is related.

  3. Guest

    Page 20 of (6 MB)
    says this marking is according to the European standard EN 61058-1 and
    means 10 A resistive, 3 A "motor", 250 V AC. The micro symbol might
    mean "microdisconnection, contact gap < 3 mm", and the T85 might mean
    that it is temperature rated to 85 C.

    There is no further explanation in that document as to what "motor" load
    means - higher inrush current, different power factor, etc. Googling
    around finds a suggestion that for EN 61058-1, "motor" load means a
    power factor of about 0.6, and that the switch can handle an inrush
    current of six times the rating (18 A in this case).

    I hope this helps!

    Standard disclaimers apply; I don't get money or other consideration
    from any companies mentioned.

    Matt Roberds
  4. legg

    legg Guest

    The AC symbol follows the dual rating. If it were a DC rating, the DC
    symbol would appear.

  5. Jamie

    Jamie Guest

    Absolutely incorrect..

    We buy switches all the time that are stamped that way.. if you look
    at the catalog directory on the switch, you'll see the DC rating which
    follows the same markings.

    Not saying that switch he has is also following that rule but,
    switched (many of them) are marked that way with no DC indicator on the
    body, mainly because their isn't enough room to do so.

    So don't think that it can't be when I know for a fact that it can be
    because I have switches labeled that way however, this switch here you
    don't know that unless you actually look at the catalog information on
    it. But it's been my experience that is what they do to save space, in
    case the switch gets used in a DC environment, which in many cases, they

    Switches are always derated in DC usage due to plasma destruction.

    But unless you know for sure about this switch, I wouldn't be
    persistent about it. I only offered a suggestion which I think is
    pretty close to what it is..

  6. Jamie

    Jamie Guest

    Oh, that explains it, JameCo..

    I don't think you get it. No surprise.

  7. legg

    legg Guest

    Page 13:

    Possible multiple markings for this switch are listed.

    Manufacturer ratings have little to do with the requirements for the
    markings of certified components. There are likely different part
    numbers that cover varying labeling requirements. These markings are
    informative,only - but they must not misinform. A DC marking will have
    the appropriate DC symbol.

    The important marking is actually the identifying part number of the
    manufacturer's part - that can be cross-related to the safety file's
    paperwork at any time, for current information.

  8. legg

    legg Guest

    If you try switching 250VDC, regularly, with one of those switches,
    you'll get it, too.

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