And 3 phase demands a 3 pole Circuit Breaker ( 208 or 240 VAC ) . And 3 phase 480 VAC .
Functionally , 3 single pole CB's ( or 2 single pole CB's for single phase ) can be used with breaker handle ties . Best I remember , this is still code legal .
2 or 3 single pole CB's without handle ties are not code legal .
That's the way it is .
God bless
Wyr
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