The IS-B50HU-C0 from PolyPhaser is a RF Surge Protector with Frequency 1.5 to 700 MHz, Input Power 3000 W, Insertion Loss 0.1 dB, Operating Temperature -45 to 85 Degree C, Storage Temperature -45 to 85 Degree C. Tags: Gas Discharge Tube. More details for IS-B50HU-C0 can be seen below.