The HT-RI-E3PM-BNFM from PolyPhaser is a RF Surge Protector with Frequency 10 to 700 MHz, Input Power 500 W, Insertion Loss 0.1 dB, Operating Temperature -50 to 85 Degree C, Surge Current 20 to 50 kA. Tags: Gas Discharge Tube. More details for HT-RI-E3PM-BNFM can be seen below.