Since 1933, Niagara Transformer Corporation, an ISO 9001:2008 Registered Company, has been designing and manufacturing Transformers in the United States of America. Our primary focus is to provide "customer designed" transformers, without taking any exceptions. This could mean non-standard features such as very high or low impedances, very low sound levels, special frequencies and non-standard voltages. Our diverse product lines include Liquid-Immersed, Dry and Cast Coil Construction, with ratings up to 50,000 kVA and 138 kV (550 kV BIL). Our products are available in a very wide variety of types, including Substation Transformers, Load Tap-Changing Transformers, Generator Step-Up Transformers, Unit Auxiliary Transformers, Station Service Transformers, Voltage Regulators, Grounding Transformers, Reactors, Auto-Transformers, Motor-Starting Auto-Transformers, Rectifier Duty Transformers, Drive-Duty Transformers, Traction Duty Transformers, Power Potential Transformers, Phase-Shifting Transformers, Mining Duty Transformers, Marine Duty Transformers, Arc Furnace Transformers, Induction Furnace Transformers and Test Transformers.