The 100025540 from Telegartner is a RF Surge Protector with Frequency DC to 3.8 GHz, Insertion Loss 0.1 to 0.2 dB, Operating Temperature -30 to 100 Degree C, Return Loss 23 to 30 dB, Surge Current 15 to 40 kA. Tags: Gas Discharge Tube. More details for 100025540 can be seen below.