200 Amp breaker

Discussion in 'Electrical Forum discussion & Blog' started by Ian Gills, May 21, 2010.

  1. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Joined:
    Jul 24, 2007
    Occupation:
    Robber, with some DIY on the side.
    Location:
    USA
    The 200 amp main breaker in my new Square D panel is tough to switch on and off, and certainly more stiff than my old 100 amp one.

    Is this normal?
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    The contacts are twice as large, so yes, I think it is normal for it to be stiffer. It also uses a bigger spring to ensure it can break the connection. To overcome the effects when 200A is flowing, and the resulting heat, it applies more pressure to the contacts so they can achieve minimal voltage drop across.

    On super large breakers, they have a rachet handle to pump it back closed.
     
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  4. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Joined:
    Jul 24, 2007
    Occupation:
    Robber, with some DIY on the side.
    Location:
    USA
    Thank you, and very informative.
     
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