What is a gas tube?
A gas tube is a voltage-dependent device used to protect equipment from overvoltages. During an overvoltage the gas tube will conduct (or fire), thus diverting the surge currents through itself. Gas tubes are sealed devices which contain an inert gas which helps the device conduct at a predetermined voltage. Gas tubes are typically used in data line protection devices. Most often, they are used in conjunction with other high speed protection technologies due to their slow response time, which is on the order of microseconds.
