Siemens transformers are completely static electrical devices which convert alternating current from one voltage level to another. The transformer is used to match the voltage supply to the electrical load. They can increase (step-up) or decrease (step-down) voltages. Since no vaults are required for installation, dry type transformers can be located right at the load to provide correct voltage for the application. This eliminates the need for long, costly, low voltage feeders. Siemens general purpose transformers meet applicable NEMA, ANSI, UL, and IEEE standards.
Department of Energy (DOE) 10 CFR 431 released efficiency standards which will take effect January 1, 2016. All Transformers covered by this document manufactured after December 31, 2015 must be compliant with the new standard. See section below for more details.