The Square D QO 100 Amp 6-Space 12-Circuit Fixed Main Lugs Indoor Load Center is UL listed for residential, commercial and industrial power distribution. This load center is built with a rugged themoplastic interior and an aluminum bus bar plated for reliability. QO load centers are tested and listed only for QO circuit breakers. QO load centers are the "World's Finest" designed with industry leading features for flexible application. QO load centers include features engineered for fast installation and wire savings.