Custom built power supplies can be designed and manufactured to your exact requirements. They can be single phase or three phase input, and AC or DC output. The output can be fixed voltage or variable voltage: variable output may be adjustable in fixed steps or be continuously variable. The output(s) can range from a few volts at several thousand amps to several thousand volts at a few milliamps.
Quote a specification and Majestic Transformer Co. will design a unit to meet your requirements.