The ABB 9T51B0128 Buck-Boost Transformer is a versatile and efficient solution for adjusting supply voltage levels. With a power rating of 0.5Kva, this transformer features a dual voltage primary and secondary, allowing for a wide range of voltage combinations. It is designed to either buck (lower) or boost (raise) the supply voltage by 5 to 27%, making it ideal for applications requiring precise voltage adjustments. Housed in a NEMA 3R weatherproof enclosure, it is suitable for both indoor and outdoor use. The transformer is equipped with an encapsulated copper core and coils, and includes an integrated junction box with a ground lug for easy wiring. This makes it particularly useful when wiring three units together to form a 3-phase autotransformer. The improved termination spacing and wiring compartment provide flexibility in selecting various UL listed connectors for copper or aluminum cables. The ABB 9T51B0128 is RoHS compliant, UL and cUL Listed, and meets the seismic requirements of IEEE-693-2005, IBC-2021, and CBC 2022, ensuring reliability and safety in diverse environments.