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What is the difference between sub feed lugs, through feed lugs, and sub feed breakers?

Issue:
What is the difference between sub-feed lugs, through-feed lugs, and sub-feed breakers?

Product Line:
Panelboards

Environment:
Applies to NQ and NF Panelboards

Resolution:
Sub feed lugs are a replacement set of lugs that is used in place of the main lugs of a panelboard. They allow the installer to subfeed to another panel or device. They can be used on main lugs interiors.
Feed through lugs are a second set of lugs mounted opposite the mains end on the end of the bussing. They can be used on main lug or main breaker interiors.
Sub feed breakers are branch breakers mounted opposite the mains end on the end of the bussing. They can be used on main lugs or main breaker interiors.
See the below picture as a reference.

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