GHB Breaker installation

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Woodenduck

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Electrical Estimator
Can a GHB3070 breaker be installed in a Eaton PRL1a panel? the label inside the panel does not indicate this, and will it operate at 208V ac correctly?
 
Only PRL2 and PRL3 are listed for GHB breakers. The GHB breaker will work on a 208v system, but I can’t remember if they’re physically the same dimensions as a BA/QB style breaker. I’d have to look at one in the shop tomorrow to verify. But that breaker definitely isn’t on the label of acceptable breakers in a PRL1 panel.


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brantmacga said:
Only PRL2 and PRL3 are listed for GHB breakers. The GHB breaker will work on a 208v system, but I can’t remember if they’re physically the same dimensions as a BA/QB style breaker. I’d have to look at one in the shop tomorrow to verify. But that breaker definitely isn’t on the label of acceptable breakers in a PRL1 panel.


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Being a Siemens guy, I am not familiar with Eaton panel boards, so I looked at the catalog out of curiosity. I find some of things they do strange. I guess the PRL1 is only for <250 V systems. Then if you look at a PRL2, under the list of branch breakers, GHB is in there but there is a note that says "For use on 480Y/277 Vac systems only." Do they really restrict there 277/480 breakers to only 277/480 systems? Siemens has no such restriction and their <250V breakers are physically the same as their 277/480 breakers (BQD being the common one). In fact last panelboard I ordered was for 120/208 but came with some BQD's, presumably they hadn't availability issue with the standard B breakers.
 
brantmacga said:
Only PRL2 and PRL3 are listed for GHB breakers. The GHB breaker will work on a 208v system, but I can’t remember if they’re physically the same dimensions as a BA/QB style breaker. I’d have to look at one in the shop tomorrow to verify. But that breaker definitely isn’t on the label of acceptable breakers in a PRL1 panel.


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Thank you
brantmacga said:
Only PRL2 and PRL3 are listed for GHB breakers. The GHB breaker will work on a 208v system, but I can’t remember if they’re physically the same dimensions as a BA/QB style breaker. I’d have to look at one in the shop tomorrow to verify. But that breaker definitely isn’t on the label of acceptable breakers in a PRL1 panel.


Sent from my iPhone using Tapatalk
Click to expand...
 
electrofelon said:
Being a Siemens guy, I am not familiar with Eaton panel boards, so I looked at the catalog out of curiosity. I find some of things they do strange. I guess the PRL1 is only for <250 V systems. Then if you look at a PRL2, under the list of branch breakers, GHB is in there but there is a note that says "For use on 480Y/277 Vac systems only." Do they really restrict there 277/480 breakers to only 277/480 systems? Siemens has no such restriction and their <250V breakers are physically the same as their 277/480 breakers (BQD being the common one). In fact last panelboard I ordered was for 120/208 but came with some BQD's, presumably they hadn't availability issue with the standard B breakers.
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Hmm that's a good catch. I've never seen that note in the catalog, but I can tell you I've worked on many PRL2 and PRL3 panelboards w/ GHB breakers on a 208Y/120v system.
 
electrofelon said:
Being a Siemens guy, I am not familiar with Eaton panel boards, so I looked at the catalog out of curiosity. I find some of things they do strange. I guess the PRL1 is only for <250 V systems. Then if you look at a PRL2, under the list of branch breakers, GHB is in there but there is a note that says "For use on 480Y/277 Vac systems only." Do they really restrict there 277/480 breakers to only 277/480 systems? Siemens has no such restriction and their <250V breakers are physically the same as their 277/480 breakers (BQD being the common one). In fact last panelboard I ordered was for 120/208 but came with some BQD's, presumably they hadn't availability issue with the standard B breakers.
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Would the "For use on 480Y/277 Vac systems only." be to highlight they are supposed to used only on wye systems, not the other flavors of 480V systems?
 
Woodenduck said:
Thank you
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Thanks for all the replies, the facility already has a PRL2a panel with GHB breakers installed operating successfully at 208V, they require a GHB breaker installed in an existing PRL1a panel operating at 208V for a new machine install, as the PRL2a panel has reached capacity. I assume it would not be a problem if a GHB breaker is the same physical size as a BA breaker.
 
Woodenduck said:
Thanks for all the replies, the facility already has a PRL2a panel with GHB breakers installed operating successfully at 208V, they require a GHB breaker installed in an existing PRL1a panel operating at 208V for a new machine install, as the PRL2a panel has reached capacity. I assume it would not be a problem if a GHB breaker is the same physical size as a BA breaker.
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I would do it without hesitation too. It is quite common to use 480 volt breakers for their increased AIC rating at 208 volts (most/all mfgs do make 65k 250v breakers, but the 480 v ones are usually more common and actually cheaper.
 
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