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What is suffix Y for BDA and BGA breakers?

What is the meaning of the suffix Y on Powerpact B breakers?

Product Line:
Circuit Breakers

Applies to I-line, 2p and 3p, Powerpact B breakers, with prefix BDA24, BDA34, BGA24 and BGA34

The suffix Y applies to 2p and 3p I-line Powerpact B breakers that are rated to be used on a system with a maximum nominal voltage of 480Y/277Vac.
See the below table as a reference.  In others words Y stands for WYE and should not be used for 480V Delta applications

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