Relay and Switch Help...

Discussion in 'General Electronics Chat' started by Dynaman, Jan 17, 2008.

  1. Dynaman

    Thread Starter Active Member

    Jan 17, 2008
    46
    0
    First time poster...

    I was wondering if anybody had any documentation, links, or can tell me why running moderate currents through a switch or relay at high frequencies say 10-15khz vs. 60 hz. shortens the life of the contacts. I am trying to explain the physics, but am having difficulty.

    Thanks!
     
  2. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    Just a guess, but wouldn't the skin effect have a lot to do with this? Having the current isolated to the perimeter of the conductor and contacts may decrease life.

    Steve
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Moderate currents at what voltage? 60 ma at 12 volts is .72 watts, but at 60,000 volts is 3600 watts.
     
  4. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    When talking about relays, current is the factor. It can be 60mA at 12V or 60mA at 60000V. It doesn't matter. Current is the damaging factor for the relay contacts.
     
  5. Dynaman

    Thread Starter Active Member

    Jan 17, 2008
    46
    0
    Figure Audio.... 70V system, 150W-300W power amp.

    That help a little?
     
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