The Square D QO 100 Amp 8-Space 16-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 is compatible with Square D QO circuit breakers. QO load centers are the "World's Finest" designed with industry leading features for flexible application. Square D QO breaker boxes include features engineered for fast installation and wire savings.