Can you use a 277V switch on a 120V circuit?

Discussion in 'Electrical Forum discussion & Blog' started by philefriendly, Oct 13, 2010.

  1. philefriendly

    philefriendly New Member

    Joined:
    Aug 14, 2006
    Location:
    Seattle, WA
    Hi-
    I happen to have an occupancy sensor/dimmer switch that is rated for 277V, and I'd like to use it for a light on a regular 120V circuit. Would this work? I'm skeptical because the switch (Wattstopper WD-180) only says it is rated at 277V, whereas they do have other models that are rated 120V-277V.

    Thanks in advance!
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
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    New England
    Probably not since it is electronic. Maybe, you'd have to call them to be sure, or read the installation manual, if available on-line, to find out. Non-electronic stuff like simple switches, wires, connectors, etc. that are rated for (maybe much) higher voltages than planned, are fine to use on a lower voltage. Electronic stuff may or may not work at a lower voltage.
     
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  4. jbfan74

    jbfan74 Electrical Contractor

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    Since it is rated at 277, it requires that voltage to operate.
    As you have found out, they make a 120/277 rated sensor, and that would work.
     
  5. jimbo

    jimbo Plumber

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    Aug 31, 2004
    Location:
    San Diego
    The WD-170 is the 120 volt model.
     
  6. hj

    hj Moderator & Master Plumber Staff Member

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    A simple on/off mechanical switch would be rated for its maximum voltage, but one with an electronic function will only work at the specified voltage.
     
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
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    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Most electronic stuff is marked with a voltage range, if it can work with various inputs. When it is listed with one voltage, generally, that's it.
     
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