引燃管（英语：Ignitron）是一种单阳极的汞弧型整流管，主要应用于控制器和大功率整流器。美国西屋电气工程师约瑟夫·斯莱皮恩（Joseph Slepian）在1933年将弧光放电现象应用到开关技术，成功发明了引燃管。引燃管分为阴极、引燃极和阳极三个部分，阴极和阳极分别为汞池和石墨或不锈钢，引燃极是引燃管最重要的部分，以耐高温的、具有高电阻率且不被汞浸润的材料制成，通常为碳化硅或碳化硼等半导体材料。当引燃电流时，汞池表面产生阴极炽点而发射电子，电子在向阳极运动过程中使汞蒸气电离，在阳极与汞池间形成弧光，放电。

An ignitron is a type of gas-filled tube used as a controlled rectifier and dating from the 1930s. Invented by Joseph Slepian while employed by Westinghouse, Westinghouse was the original manufacturer and owned trademark rights to the name "Ignitron". Ignitrons are closely related to mercury-arc valves but differ in the way the arc is ignited. They function similarly to thyratrons; a triggering pulse to the igniter electrode turns the device "on", allowing a high current to flow between the cathode and anode electrodes. After it is turned on, the current through the anode must be reduced to zero to restore the device to its nonconducting state. They are used to switch high currents in heavy industrial applications.