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Switch contact material rating - use 120 V AC rated with low DC ?

Discussion in 'Electronic Design' started by Steve, Aug 7, 2009.

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  1. Steve

    Steve Guest

    Comparing switches with different contact materials and their
    subsequent ratings.

    One with copper alloy contacts and terminals with gold plate over
    nickel plate is rated at 0.4 VA max at 20 V AC or DC.
    C&K 7101K2CBE

    The same switch with its end contacts of coin silver, silver plated
    and its center contact and all terminals copper alloy, silver plated
    has a 5 A at 120 V AC rating. No DC rating given.
    C&K 7101K2CQE

    What happens if the second switch that has no DC rating is used with
    DC ? Does some kind of electrolysis happen with long term usage due
    to passign current in only one direction ?
    Why does it not have a DC rating ?

    Would it be ok to use the second switch that has no specified DC
    rating with a DC signal of 10 V max if used with les than 1 mA ?
  2. Steve

    Steve Guest

    I now see that the C&K data sheet also says the Q material is also
    rated to 5 A at 120 V AC or 28 V DC. The Digikey catalog says that is
    not for the 7000 series switches - only for the E series.
  3. Rich Grise

    Rich Grise Guest

    There's a pretty good explanation of "dry switching" here:
    (mind the wrap)

    Hope This Helps!
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