The FMSP1027 from Fairview Microwave is a RF Surge Protector with Frequency 1.5 to 700 MHz, Input Power 100 to 500 W, Insertion Loss 0.1 dB, Operating Temperature -45 to 50 Degree C, Return Loss 26 dB. Tags: Gas Discharge Tube. More details for FMSP1027 can be seen below.