The PTRT7MT7F09S from NexTek, LLC. is a RF Surge Protector with Frequency DC to 0.75 GHz, Input Power 37 W, Insertion Loss 0.15 to 0.2 dB, Operating Current 7.5 A, Operating Temperature -40 to 90 Degree C. Tags: Gas Discharge Tube. More details for PTRT7MT7F09S can be seen below.