The PTRONFSAF09S from NexTek, LLC. is a RF Surge Protector with Frequency DC to 2.5 GHz, Input Power 37 to 1600 W, Insertion Loss 0.2 to 0.3 dB, Operating Temperature -40 to 90 Degree C, Surge Current 40 kA. Tags: Gas Discharge Tube. More details for PTRONFSAF09S can be seen below.