The JCD0300T0420G15 from JQL Electronics is a RF & Microwave Circulator with Frequency 300 to 420 MHz, Average Power Forward 150 W, Insertion Loss 0.5 dB, Isolation 18 dB, Operating Temperature 0 to 60 Degree C. Tags: Drop-in Circulator. More details for JCD0300T0420G15 can be seen below.