Main Breaker Load Centers Arrive With A Main Breaker Installed For A Convenient and Swift Install. Main Breakers Allow For The User to Stop The Flow Of Electricity In The Load Center, Shutting Off All The Power In The Residence. The TM820RCUFL Features Spaces For 8, 1" Breakers, A 200A Main Ampere Rating, A Copper Bus, Factory Installed Feed-Through Lugs, and An Outdoor Suitable Enclosure.