This equipment is specially designed and priced to connect and disconnect a load from asingle-phase utility power sourceand switch to backup power. This industry-first product puts everything you need in one box: Made in the USA Ronk reliability, simplicity, economy, and safety, all packaged in an all-aluminum, rainproof NEMA 3R enclosure. Best of all, its unique design load-break contact mechanism will not fail due to fouling, is non-jamming, includes a neutral bar and uses best-in-class type T fusing.