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This disclosure proposes a novel design of an ultra fast mechanical switch, suitable for DC circuit breakers and other
fast acting circuit breakers. The novel design allows faster operation speed which is crucial for quick protection in
power systems, especially in DC systems. It’s easy to scale up for heavy load, and reduces both mechanical and
electrical stresses in its components. Further more, it needs only one semiconductor switch for control rather than two
in conventional designs, and it does not require excess materials.