The RC1523CS-040050 from ZTS Technologies is a RF & Microwave Circulator with Frequency 4 to 5 GHz, Average Power Forward 60 W, Insertion Loss 0.4 dB, Isolation 18 dB, Operating Temperature -10 to 60 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC1523CS-040050 can be seen below.