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  1. #1
    Join Date
    Mar 2007
    Location
    Bakersfield, California
    Posts
    62

    Default Special - Not for General Use

    Found this breaker sitting loose in the panel. Not sure what to think of it. Any thoughts?

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  2. #2
    Join Date
    Mar 2007
    Location
    Washington State
    Posts
    579

    Default Re: Special - Not for General Use

    I find loose unused breakers in service panels quite often. Being that they are not connected or in use, I don't worry about them or give it a second thought. I just move on and look for the real concerns.


  3. #3
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default Re: Special - Not for General Use

    Yes, but... what does that marking mean?

    A Google for UL "Not for General Use" gets me to item 43 here and "HOM2305210" returns "Motor Control" as the type here.

    Last edited by Michael Thomas; 03-15-2012 at 04:25 PM.
    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

  4. #4
    Robert Meier's Avatar
    Robert Meier Guest

    Default Re: Special - Not for General Use

    According to that part number the Sq D website lists that as a miniature Circuit Breaker.



    http://products.schneider-electric.u...countrycode=us


  5. #5
    Join Date
    Mar 2012
    Location
    Northern Indiana
    Posts
    95

    Default Re: Special - Not for General Use

    It's probably an inverse-time breaker typically used for motor control circuits as opposed to a "typical" thermal magnetic breaker.

    All molded case circuit breakers are INVERSE TIME circuit breakers (OK 99% of them). All this means is the higher the current the faster the CB trips.

    Circuit breakers utilized in typical branch circuit wiring are thermal magnetic devices. That is thermal is the long time/overload portion, higher the current the faster the circuit breaker operates for over loads.

    For thermal Such as a 20 am CB may carry 300% (60 amp) for 30 seconds
    200% (40 amps) for 90 seconds
    110% (22 amps) for days
    All times are estimates/guesses as I do not have time curves available at this time, (there are in the office).

    For Instantaneous Instantaneous occurs at multiples above 400% typically and operates on the same principle, the higher the current the faster the CB trips.

    Inverse only CBs are normally part of a motor control stater or motor control center where the thermal (long time/overload) protects the motor against overloads, the inverse time is for fault protection and is sized to permit the motor to start (starting currents are typically 4-6 times). Inverse CBs have settings from 4-12 times normally that is for a 20 amp CB 80 to 240 amps.

    Last edited by Brad Richter; 03-15-2012 at 05:38 PM.

  6. #6
    Join Date
    Oct 2009
    Location
    michigan
    Posts
    421

    Default Re: Special - Not for General Use

    Good info Brad.
    I was thinking that this may have simply been a manual/mechanical disconnect w/o any overcurrent or short circuit protection.
    Kind of like those tap blocks in the form of a circuit breaker case used to feed some panels.


  7. #7
    Robert Meier's Avatar
    Robert Meier Guest

    Default Re: Special - Not for General Use

    Judging from the part number I'm inclined to think that it's a counterfeit breaker.


  8. #8
    Join Date
    Mar 2012
    Location
    Northern Indiana
    Posts
    95

    Default Re: Special - Not for General Use

    Quote Originally Posted by Robert Meier View Post
    Judging from the part number I'm inclined to think that it's a counterfeit breaker.
    That is a possibility. That number could be a distributors part number rather than a manufacturer's part number.


  9. #9
    Join Date
    Dec 2007
    Location
    Chico,Ca
    Posts
    423

    Default Re: Special - Not for General Use

    I have some ITE BQ frame breakers (bolt -on type) that are marked in the same manner, the reason being they have 1/4" quick-disconnect terminals instead of the traditional lugs,they are intended for OEM use in equipment.


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