The JC2C0300T0420N20 from JQL Electronics is a RF & Microwave Circulator with Frequency 300 to 420 MHz, Average Power Forward 200 W, Insertion Loss 1 dB, Isolation 36 dB, Operating Temperature -30 to 60 Degree C. Tags: Coaxial Circulator. More details for JC2C0300T0420N20 can be seen below.