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What is the largest branch breaker available on a Speed-D switchboard with an I-line interior configuration?

Need the highest amp breaker that can go in a Speed D board's I-line distribution section.

Product Line:  
Class 2710 Switchboards

Speed-D Interiors

Need to know if a 600 A feeder breaker can be installed

The largest breaker that can be installed on the right is a 400A LA or LH frame and the largest breaker on the left is 250A J-frame.  The I-line section of Speed-D boards has 27" of mounting space.  
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