Ceramic gas discharge tube ceramic encapsulated inside by two or more band gap metal electrodes, filled with inert gas argon, neon, when added to the two extreme voltage electric to gas discharge tube gas breakdown when the gas discharge tube to discharge from high impedance to low impedance, the surge short circuit voltage rapidly to zero voltage and overcurrent release into the ground, thus protecting the subsequent circuit. When the surge voltage disappears, the ceramic discharge tube out back to the high impedance state, waiting for the next action, the ceramic discharge tube is often used in multistage protection circuit in the first level or two level, since the discharge of lightning transient overcurrent and overvoltage limiting effect.
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