The PTRONSAF35S from NexTek, LLC. is a RF Surge Protector with Frequency DC to 2.5 GHz, Input Power 550 W, Insertion Loss 0.2 to 0.3 dB, Operating Current 5 A, Operating Temperature -40 to 90 Degree C. Tags: Gas Discharge Tube. More details for PTRONSAF35S can be seen below.