Square D Homeline 100A Main Breaker Plug-on Neutral Load Center Square D Homeline convertible main breaker load center. For residential and commercial power distribution. Plug-on Neutral ready and built with a plated, aluminum bus bar that is tested and listed only for Homeline circuit breakers. 100 amp main breaker included. Engineered for fast installation and wire savings. UL Underwriter's Laboratories listed for residential and commercial power distribution. Series Homeline, Amperage 100A, Number Of Spaces 20 Spaces, Max Number of Circuits 40 Circuits, Voltage 120V/240V, Enclosure Type Indoor, Mount Type Combination, Phase Single, Wire Size 6 #1 AWG Copper, Aluminum , UL Listed Yes, Pkg Qty 1, Package Type Box WARNING This product can expose you to chemicals including lead which is known to the State of California to cause cancer and which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65W