The IS-50NX-C2 from PolyPhaser is a RF Surge Protector with Frequency 125 MHz to 1 GHz, Input Power 375 W, Insertion Loss 0.1 dB, Operating Temperature -50 to 85 Degree C, Storage Temperature -55 to 85 Degree C. Tags: Gas Discharge Tube. More details for IS-50NX-C2 can be seen below.