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Platinum contacts

Discussion in 'Electronic Repair' started by N_Cook, Jun 9, 2008.

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  1. N_Cook

    N_Cook Guest

    or are they? how do you tell ?
    Raised pips spot-welded? on otherwise silver plated rockers in switch rated
    15 amp , 250V.
    If platinum, are they wholly platinum or somehow coated on a more base metal
    for the main body of the pip.
     
  2. GregS

    GregS Guest

    I work with copper, platinum, and silver wire. I hold up a piece of platinum
    wire above a BIC and it does not turn black with soot if held there. Your
    going to have to get that contact pretty hold to do this test. May affect
    other things.

    greg
     
  3. Ross Herbert

    Ross Herbert Guest

    :eek:r are they? how do you tell ?
    :Raised pips spot-welded? on otherwise silver plated rockers in switch rated
    :15 amp , 250V.
    :If platinum, are they wholly platinum or somehow coated on a more base metal
    :for the main body of the pip.


    Going back into the dim dark recesses of my memory (with a little refreshing
    thrown in) I recall the use of platinum relay contacts was usually only
    specified where high reliability and/or currents and the presence of arcing was
    expected. It is rare to find pure platinum contacts and they usually have some
    added element to harden them and make them more resistant to tarnishing, arc
    formation and wear. Materials such as iridium, ruthenium, nickel, molybdenum or
    osmium are used.

    How do you tell whether they are platinum contacts or not? I don't know. It may
    depend on the manufacturer and you have to take their word for it. On 3000 type
    relays used in telephony platinum contacts were marked with a V notch at the end
    of the spring.
     
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