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In Captain America: Civil War the main antagonist, Helmut Zemo, uses a device to disable an electrical substation.

What is that device called?

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It's a device for generating an EMP (Electro-Magnetic Pulse)

An electromagnetic pulse (EMP), also sometimes called a transient electromagnetic disturbance, is a short burst of electromagnetic energy. Such a pulse's origination may be a natural occurrence or man-made and can occur as a radiated, electric, or magnetic field or a conducted electric current, depending on the source.

Wikipedia

Such devices can vary in size from small hand-held devices to large "guns" and, for the purposes of the movie, large area devices.

EMP "Guns"

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