The IS-50UX-C1-MA from PolyPhaser is a RF Surge Protector with Frequency 50 to 700 MHz, Input Power 375 W, Insertion Loss 0.1 dB, Operating Temperature -45 to 50 Degree C, Storage Temperature -45 to 85 Degree C. Tags: Gas Discharge Tube. More details for IS-50UX-C1-MA can be seen below.