The FMSP1021 from Fairview Microwave is a RF Surge Protector with Frequency 1.5 to 700 MHz, Input Power 125 to 2000 W, Insertion Loss 0.1 dB, Operating Temperature -55 to 85 Degree C, Surge Current 50 kA. Tags: Gas Discharge Tube. More details for FMSP1021 can be seen below.