The 200 Amp 20-Space 40-Circuits Main Breaker Load Center is a Combination Service Entrance Device for outdoor installations. This load center features a ring-type meter cover with a single-phase, 4-jaw meter socket. Designed for overhead feeds, this main breaker offers two 2-1/2 in. type-A hubs in the top end wall and a 2-1/2 in. knockout in the bottom end wall.