Gas discharge tubes are referred to by a number of names such as GDTs, gas plasma tubes, surge arrestors, spark gaps or jumbo gaps. GDTs are used to protect personnel and sensitive equipment from hazardous transient voltages. Bourns® GDTs can withstand multiple applications of high surge current in excess of 25 kA and are used in primary and secondary applications. Bourns offers 8 mm std. size and the 5 mm Mini Series GDTs in two and three electrode versions, which feature long service life, low capacitance and low insertion loss. An optional, proprietary Switch-Grade Failshort is offered on the three-electrode versions to provide superior protection from thermal runaway. Bourns has trademarked its 8 mm heavy duty, common chamber GDT as the TRIGARD® Model. Bourns® GDTs are designed to provide superior, long life overvoltage protection against high energy lightning transients on conductors.