A gas-discharge tube used to switch an electric current in response to an electrical control signal.
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A thyratron is a type of gas-filled tube that acts as a high-speed switch and is used in various electronic applications, particularly in power control systems. It is a type of triggered gas discharge device, which means it can be turned on by a small triggering pulse applied to one of its electrodes, allowing a much larger current to flow between the other electrodes.