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A novel modification to Z-Source DC circuit breakers has been proposed to reduce power consumption from its predecessor significantly. The power thyristor serves as the means of circuit isolation and voltage blocking in the event of a fault in traditional Z-Source DC circuit breakers. However, Z-Source circuit breakers direct full load current through the Thyristor. The resulting voltage difference and current flow yield substantial power consumption, heat generation, and reduced efficiency. Integrating a fast-mechanical switch and associated control, a zero current crossing and circuit isolation is achieved without significant on-state switch losses.