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The Square D QO 3-Phase 225 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 Finestdesigned with industry leading features for flexible application. QO load centers include features engineered for fast installation and wire savings.