Maximum system voltage is up to 240 VAC for AQ panelboard line, field installable kits allow you to shift gears on the fly, standard Pro-Stock™ panels have the capability of adding sub feed breakers or feed-thru lugs in the field, all panel are convertible between main lugs or main breakers, reversible interior. No need to specify top or bottom feed, solid state Spectra RMS™ or thermal magnetic breakers available as mains or sub-feeds, NEMA 1 or 3R/12 enclosures available, flush or surface mounted trims with door within door and front hinge to box options available, extruded split neutrals speed and simplify wiring, main bus ratings of 225 A, 400 A and 480 A available, modular kits allow for field installation of 200% neutrals and service entrance bonding straps, field installable TVSS (transient voltage surge suppression) kits - 200 kA per phase, up to 6 poles of sub feed available in 400 A and 600 A and up to 3-poles of sub feed available in 225 A.