The Cutler-Hammer Freedom 2100 Motor Control Center may be joined to existing Five Star, Series 2100, and Advantage installations using the splice bar kits common to both. Units designed for the Freedom 2100 can be mounted in Five Star Series and Series 2100 sections, but the opposite is not recommended, because Five Star and Series 2100 units may lack terminal blocks and sufficient interrupting capacity. The Freedom 2100 MCC may be joined to existing Cutler-Hammer Freedom Unitrol and F10 Unitrol MCC’s with a special splice bar kit, but units are not interchangable.