The JCD0300T0400G6 from JQL Electronics is a RF & Microwave Circulator with Frequency 300 to 400 MHz, Average Power Forward 60 W, Insertion Loss 0.7 dB, Isolation 15 dB, Operating Temperature -40 to 85 Degree C. Tags: Drop-in Circulator. More details for JCD0300T0400G6 can be seen below.