The two main types of Square D panels for residential use are the Square D Homeline series and the Square D QO series, which are both made by Schneider Electric but target different markets and have distinct features. The Square D Homeline series is the economical, builder-grade line that is widely available at Home Depot, Lowes, and hardware stores. It is designed for residential use, has a simpler design, uses Homeline breakers with a distinctive red and black handle, and offers good reliability at a lower price point. Homeline panels are available in 100 amp to 225 amp sizes with up to 40 spaces and are suitable for most homes. The Square D QO series is the premium, professional-grade line preferred by licensed electricians. QO stands for Quick Open and is known for its visible red trip indicator flag that shows when a breaker has tripped, its higher interrupting ratings, its option for copper bus bars, and its more robust construction. QO panels use QO breakers, which have a different shape and are not interchangeable with Homeline. QO panels are generally more expensive but offer better durability and a longer track record. In commercial and industrial applications, Square D also makes NQ and NF panel boards, but for residential, Homeline and QO are the two types most homeowners will encounter.
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