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The usage of electron beams is more thermally efficient than classical resistive ovens or induction heating technologies in the semiconductors industry. Currently, however, adjustable switched mode power sources (SMPSs) at sub-megawatt power, needed for e-beam installation, are not readily available at an affordable price. This article presents a 30kV 4A direct current adjustable SMPS, capable of withstanding frequent short-circuit pulses (up to 10 per minute), used to power an electron beam gun in the melting of silica metallurgy. Developed solutions may be helpful for usage in various other high power machinery as well. Production of the SMPS described here required a mechanical workshop and long-term experience in practical electronics. The authors share summarized problems and solutions identified regarding the development of this device, with which, to the best of our knowledge, very few specialists have had hands-on experience.