Diversified Technologies, Inc. (DTI) recently completed and delivered a 400 kVDC, 400 mA, solid-state power supply for a commercial client. The 160 kW average power supply is comprised of sixteen (16) 25 kV modules arranged in a vertical, air-insulated stack. Electrically, the system is a Cockcroft-Walton cascade multiplier fed by a standard DTI high power, high voltage inverter. This unit is a compact, regulated switching supply capable of adjustable output voltages of up to 400 kV and up to 400mA. It provides fast (microsecond) fault protection and protects the system in the event of an arc or overcurrent.