AC Breaker Ratings

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fatheadl
fatheadl Solar Expert Posts: 31 ✭✭
in General Solar Power Topics #1
Hi all,
I just received some 120V AC breakers i had ordered. The ratings on the breakers i got were 277/480V. Is this rating correct for 120V Ac use?

Thanks in advance
fatheadl
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  • crewzer
    crewzer Registered Users, Solar Expert Posts: 1,832 ✭✭✭✭
    #2
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    Re: AC Breaker Ratings

    Shouldn't be a problem. Square D says "The circuit breaker must have a voltage rating greater than, or equal to, the system voltage." So, 120 VAC, 50 Hz - 60 Hz applications should be OK for breakers rated for 277/480 VAC, 50 Hz-60 Hz. (277 V is the line-to-neutral voltage in a "Y" system that's 480 V line-to-line.)

    Do not use these AC breakers for DC applications unless they are specifically rated for DC.

    HTH,
    Jim / crewzer
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  • fatheadl
    fatheadl Solar Expert Posts: 31 ✭✭
    #3
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    Re: AC Breaker Ratings

    Hi Crewzer,
    Thanks for the reply.
    I think i misread the label, they seem to be a 'QL' type, with reference to other types of 'QA', 'QF' and 'QZ/QF'.

    fatheadl
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