The 2RK1800M-6, manufactured by Yageo, is a RoHS compliant surface-mount device (SMD) which consists of two discharge tubes (GDT/TSS). The GDT (Gas Discharge Tube) is used to protect circuits from overvoltage conditions, such as lightning, electrostatic discharge, or power surges, while the TSS (Transient Suppression Spark Gap) helps eliminate high frequency transmissions. Together, these two components provide efficient protection of circuits from overvoltage events. The 2RK1800M-6 has a voltage rating of 600V, with a maximum surge voltage of 1800V, and is designed to fit into small, tight spaces due to its SMD construction.