The RFCR3121 from RF-CI is a RF & Microwave Circulator with Frequency 285 to 325 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Peak Power 1000 W, Insertion Loss 0.40 to 0.50 dB. Tags: Coaxial Circulator. More details for RFCR3121 can be seen below.