Square D by Schneider Electric SO1020VP Homeline 100-Amp 10-Space 20-Circuit Outdoor Main Breaker Overhead CSED Value Pack Homeline 100 Amp 10-Space 20-Circuit Ring-Type Outdoor Overhead Service Main Breaker CSED Value Pack Accommodates plug-on secondary surge arrestor and features a plug-in design for easy installation Use type HOM circuit breakers, Rated 120/240Vac, 4 jaw meter socket NEMA type 3R enclosure