480V breaker on a 240V system

[FaradayFF]

Greetings,
Can one use a 480V, 3 pole breaker on a 240V, 3 phase system? Is that kosher?
How would that affect the kAIC rating of the unit?

Appreciate the help on this one.
Thanks,
EE

 

[Jraef]

No problem, other than to your pocketbook, and generally if the 480V interrupt rating is high enough, so is the 240V rating.

 

[jim dungar]

Can one use a 480V, 3 pole breaker on a 240V, 3 phase system?

I cannot remember ever seeing a 480V breaker that did not also have an AIC rating at 240V.
But yes you can, for non-utilization equipment, voltage ratings are maximums.

 

[infinity]

We have used 480 and 277 volt CB's on 208Y/120 volt panels when the engineer specified a high 65 KAIC rating. Something like this:

 

[Jraef]

And generally, the 240V IC rating is higher than the 480V rating, like in this case:

25kAIC @ 480V, 65kAIC at 240V

 

[brantmacga]

Yeh I’ve used NF PowerLogic 480 panelboards on 208Y/120 systems .


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