siemens hed4 15 amp 3 pole 480volt circuit breaker

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ddubbs103

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Massachusetts
I would greatly appreciate if any one could tell me what the m and b mean in these breakers siemens hed43m015 hed43b015 the reason I ask is I have to order a breaker for an older ite siemens panel for a liebert unit and i am not sure what the difference is in these breakers. It is 3 pole 15amp breaker in 480 volt panel thanks for any info.
 
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