DIY Home Improvement Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter #1
I have a Murray panel and want to replace the existing GFI 20A breaker and want to know if the Square D HOM120GFI will work? I already know the Q0120GFI breaker will work in my Murray but would like to know if they are physically equivalent and therefore BOTH work in the panel?:eek:
 

·
You talking to me?
Joined
·
7,551 Posts
the Homeline series and the QO series use different methods of attachment to the bus and therefore will not work interchangably. If you have one of each, look at the prongs used to contact the bus and you will see a difference.

with that said, do you realize it is not legal to install a breaker in a panel for which it is not UL listed. Square D, the last I knew, did not seek UL listing to place any of their breakers in any other manufacturers panels. Some other manufacturers have obtained UL listing for interchangeability into Square D panels though. You would have to check the specific UL listing for each breaker and panel or the manufacturer to determine if they are legal to interchange.
 

·
Registered
Joined
·
4 Posts
Discussion Starter #3
Thank you NAP

Many thanks for that info, NAP. I bought a Square D homeline GFI breaker and now I wil resell it; also just odered the Murray branded 20 amp MP120 GFCI breaker because of your helpful info.:thumbup:
 

·
Electrical Contractor
Joined
·
3,368 Posts
NO, the QO series breakers are not interchangeable with the HOMELINE series.

Also, neither series is UL classified for use in any other manufacturer's equipment.
 

·
Banned
Joined
·
2,487 Posts
NO, the QO series breakers are not interchangeable with the HOMELINE series.

Also, neither series is UL classified for use in any other manufacturer's equipment.
What's funny is I don't think that the Murray breakers are interchangeable with Siemens breakers, if you go by their UL listing, yet in every way but the name on the sticker they are identical. There have been a couple of instances where I used a Siemens breaker in a Murray panel because Murray is not a very common panel in my neck of the woods.
 

·
Electrical Contractor
Joined
·
3,368 Posts
Yeah,copy that. I'd be willing to bet that the "guts" of the Siemens and Murray breakers are virtually identical. The outer case seems to be, only the labeling appears to be different. Both are made by ITE.

I know that the siemens breakers have the indentation necessary for them to physically fit into a HOMELINE panel, yet the manufacturer won't admit to any reason why they altered the case for this scenario.

They fit, but are not classified for this use. :huh:
 

·
Registered
Joined
·
4 Posts
Discussion Starter #8
I was told today by an electrical retailer online store clerk that the difference between the Murray and the Square D breakers that "seem" to fit into the Murray panel very nicely, the big differences between these two breakers is, 1). The tension on the springs in the breaker have different tension strengths and, 2). The hot bus bar thickness or guage is different enough so as to constitute a possible problem at the breaker-bus connection. Can anyone confirm this as true?
 
1 - 9 of 9 Posts
Top