Standard Breaker Sizes 120/208V

[ElectDesigner]

Could some give a list the standard sizes of all 120V, single phase breakers - I tried looking on some manufacturer websites but most of them give you a range like 15-100A, I want to know the sizes in between. I know some panels have a maximum of 60A,1P.

 

[templdl]

These are typical Cutler-Hammer 3/4"/pole lug on breakers.
CHT1515 15 / 15 amp 1 Pole
CHT1520 15 / 20 amp 1 Pole
CHT2020 20 / 20 amp 1 Pole

CH215 15 amp 2 Pole
CH220 20 amp 2 Pole
CH230 30 amp 2 Pole
CH235 35 amp 2 Pole
CH240 40 amp 2 Pole
CH245 45 amp 2 Pole
CH250 50 amp 2 Pole
CH260 60 amp 2 Pole

CH270 70 amp 2 Pole
CH280 80 amp 2 Pole
CH290 90 amp 2 Pole
CH2100 100 amp 2 Pole
CH2125 125 amp 2 pole

And The SqD QO 3/4" per Pole
QO110 1 POLE 10A
QO115 1 POLE 15A
QO115HM HIGH MAGNETIC
QO120 1 POLE 20A
QO120HM HIGH MAGNETIC
QO125 1 POLE 25A
QO130 1 POLE 30A
QO140 1 POLE 40A
QO150 1 POLE 50A
QO160 1 POLE 60A

QO1515 15/15 TANDUM
QO1520 15/20 TANDUM
QO2020 20/20 TANDUM
QO2030 20/30 TANDUM
QO3020 30/20 TANDUM
QO3030 30/30 TANDUM

QO210 2 POLE 10A
QO215 2 POLE 15A
QO220 2 POLE 20A
QO225 2 POLE 25A
QO230 2 POLE 30A
QO235 2 POLE 35A
QO240 2 POLE 40A
QO245 2 POLE 45A
QO250 2 POLE 50A
QO260 2 POLE 60A
QO270 2 POLE 70A
QO280 2 POLE 80A
QO290 2 POLE 90A
QO2100 2 POLE 100A
QO2125 2 POLE 125A

 

[Jraef]

... I know some panels have a maximum of 60A,1P.

That would only be the case if you have a 60A panel...

 

[infinity]

Take look a the standard sizes from Article 240:

15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000, 5000, and 6000 amperes.

 

[ElectDesigner]

Take look a the standard sizes from Article 240:

But arent these for three pole breakers?

 

[ElectDesigner]

These are typical Cutler-Hammer 3/4"/pole lug on breakers.
CHT1515 15 / 15 amp 1 Pole
CHT1520 15 / 20 amp 1 Pole
CHT2020 20 / 20 amp 1 Pole

CH215 15 amp 2 Pole
CH220 20 amp 2 Pole
CH230 30 amp 2 Pole
CH235 35 amp 2 Pole
CH240 40 amp 2 Pole
CH245 45 amp 2 Pole
CH250 50 amp 2 Pole
CH260 60 amp 2 Pole

CH270 70 amp 2 Pole
CH280 80 amp 2 Pole
CH290 90 amp 2 Pole
CH2100 100 amp 2 Pole
CH2125 125 amp 2 pole

And The SqD QO 3/4" per Pole
QO110 1 POLE 10A
QO115 1 POLE 15A
QO115HM HIGH MAGNETIC
QO120 1 POLE 20A
QO120HM HIGH MAGNETIC
QO125 1 POLE 25A
QO130 1 POLE 30A
QO140 1 POLE 40A
QO150 1 POLE 50A
QO160 1 POLE 60A

QO1515 15/15 TANDUM
QO1520 15/20 TANDUM
QO2020 20/20 TANDUM
QO2030 20/30 TANDUM
QO3020 30/20 TANDUM
QO3030 30/30 TANDUM

QO210 2 POLE 10A
QO215 2 POLE 15A
QO220 2 POLE 20A
QO225 2 POLE 25A
QO230 2 POLE 30A
QO235 2 POLE 35A
QO240 2 POLE 40A
QO245 2 POLE 45A
QO250 2 POLE 50A
QO260 2 POLE 60A
QO270 2 POLE 70A
QO280 2 POLE 80A
QO290 2 POLE 90A
QO2100 2 POLE 100A
QO2125 2 POLE 125A

Thanks! This definitely helps. Where did you get this list from ?

 

[ElectDesigner]

That would only be the case if you have a 60A panel...

I cant find the catalog I was looking at, but Im pretty sure the panel had a much higher rating than the maximum allowed single pole breaker.

 

[templdl]

Thanks! This definitely helps. Where did you get this list from ?

This was the easiest sight:
http://www.aplussupply.com/break/cut/ch/ch.htm

http://www.aplussupply.com/break/sqd/qo/qo.htm

Also, you will note the the QO has a "high mag". Actually their standard breaker is really low mag and the high mag is the same magnetics as the standard CH.
When these small breakers are manufactured the thermal are different but the magnetics are the same in a family. So when it comes to picking up a short circuit in the lower ampacities it takes as much to trip it as it does the higher ampacities. As such the QO uses a lower mag setting so it picks up faster but also gives you the option of the "higher mag." As I recall the CH may be available in a low mag which is about the same as the standard QO.

Also, It is not uncommon for the main breaker to be actually reverse feed to the bus. But you will note that the space on the opposite side most likely can not be used to prevent overloading the bus stab connections.
If you look as the bus connections the breakers that are opposits one another share the same connection. Should you have (2) 60at breakers across from one another that's 120a on the connection. When you consider a 100a panel has a 100a main feeding the bus you may now understand why they don't allow the space across from the main to be used.

 

[infinity]

But arent these for three pole breakers?

Not the smaller ones.

 

[Strathead]

But arent these for three pole breakers?

Read article 240.6 These are the "standard ampere ratings" of circuit breakers. That term has a significant code meaning. Regardless of whether a manufacturer makes them, makes additional ones, or doesn't make them. These sizes are used in calculations with some exceptions also list in the code.

 

[kwired]

Read article 240.6 These are the "standard ampere ratings" of circuit breakers. That term has a significant code meaning. Regardless of whether a manufacturer makes them, makes additional ones, or doesn't make them. These sizes are used in calculations with some exceptions also list in the code.

That is correct. AFAIK all those standad sizes are made by all the well known manufacturers. Whether or not your supplier stocks all of them is usually the issue. Go to a big box store and some of the sizes are going to be hard to find, go to a reputable electrical supply house and all of them will be available in most cases - at least in the brand that they typically stock panels for.

 

[ElectDesigner]

Keep in mind that im in Canada, even still our code book list standard sizes. The reason I posted the OP was I was asked to do simple calculation for some single phase device , so based my calculation I needed something above 31.25Amps, so I looked in the code book and saw 35A as a standard size for single phase circuit, so I noted 35A on the panel schedule, when I showed it to a senior designer he told me that 35A,1P was not a standard size and he corrected it to 40A,1P. It could be that this particular size is not very popular and note carried by many suppliers/manufacturers? I dont know.

 

[kwired]

Keep in mind that im in Canada, even still our code book list standard sizes. The reason I posted the OP was I was asked to do simple calculation for some single phase device , so based my calculation I needed something above 31.25Amps, so I looked in the code book and saw 35A as a standard size for single phase circuit, so I noted 35A on the panel schedule, when I showed it to a senior designer he told me that 35A,1P was not a standard size and he corrected it to 40A,1P. It could be that this particular size is not very popular and note carried by many suppliers/manufacturers? I dont know.

Is 35 a standard size in Canada code? NEC does not care about number of poles - the standard sizes listed are for all breakers regardless of number of poles. It becomes difficult to find many larger sizes in single pole but they are standard size and if you look in MFG catalogs those sizes are usually listed - just nobody stocks them.