Product DescriptionThe Square D QO 3-Phase 200 Amp Main Breaker 42-Space 42-Circuit Convertible Indoor Load Center is UL listed for residential, commercial and industrial power distribution. This load center is built with a shielded, copper bus bar that is 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.From the ManufacturerWARNING: This product can expose you to chemicals including Lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov