The PTCNFMMF23S from NexTek, LLC. is a RF Surge Protector with Frequency DC to 6 GHz, Input Power 240 W, Insertion Loss 0.1 to 0.3 dB, Operating Current 2.5 A (Through), Operating Temperature -55 to 85 Degree C. Tags: Gas Discharge Tube. More details for PTCNFMMF23S can be seen below.