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What are the differences between Powerpact B-frame and H-frame?

What is the advantage of using a B frame from an H frame?
Product Line:
Molded Case Circuit Breakers
Powerpact B-Frame and H-frame Circuit Breakers
Powerpact B-frame 
-available in 1, 2 and 3 pole construction
-available up to 125A
-compatible with Everlink lugs
-rated 600Y/347V max. , Also availble in 480Y/277V max. (I-Line breaker only, with suffix "Y" and voltage code is 4 ,i.e. BGA34050Y) 

Powerpact H-frame 
-available in 2 and 3 pole construction only
-available up to 150A
-rated 600V max.
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