The GE 200 Amp 20-Space 40-Circuit Main Breaker Outdoor Load Center Contractor Kit is pre-packaged with a selection of circuit breakers. The UL-listed load center has holes rated 100% split neutral on each side that are compatible with #14-4 wire. The breaker box is a single-phase, 3-wire unit with a factory-installed main breaker. The center is designed and built for faster installation and a more dependable performance. This unit is compatible with DFs, GFCIs, AFCIs and standard circuit breakers.